HK1098142B - Process for producing dibenzothiazepine derivatives - Google Patents

Description

Process for preparing dibenzothiazepine  derivatives

The application is the application number CN200610006965.7 (application date is 7/9/1999), and the name of the invention is dibenzothiazepineMethod for producing derivative, China application having application number CN99816885.8 (9/7/1999) entitled "DibenzothiazepineMethod for the preparation of derivatives "divisional application of the national phase-entering PCT application.

Technical Field

The present invention relates to dibenzothiazepine useful as an intermediate for pharmaceutical productsA preparation method of the derivative. The invention relates in particular to 11- [ 4- (2- (2-hydroxyethoxy) ethyl ] -1-piperazinyl dibenzothiazepine useful as antipsychotic agentsDibenzothiazepine represented by the following general formula (5) useful as an intermediate for the production thereofA preparation method of the derivative.

In the formula, R¹、R²、R³、R⁴、R⁵、R⁶、R⁷And R⁸May be the same or different and represents a hydrogen atom or an alkyl group, an alkoxy group, an alkylcarbonyl group, an aryl group, an aryloxy group or an arylcarbonyl group which may have a substituent.

Background

For the dibenzothiazepine of the above general formula (5)The derivatives are described in EP-0282236-A1 and the use of such dibenzothiazepine is elucidatedDerivatives as starting materials from which 11- [ 4- (2- (2-hydroxyethoxy) ethyl ] -1-piperazinyl dibenzothiazepine useful as antipsychotic agents can be derivedAnd (3) derivatives. That is, the dibenzothiazepine of the general formula (5) is illustratedRepresentative compounds of the derivatives dibenzo [ b, f ] -1, 4 ] thiazepineReaction of-11 ketone with phosphorus oxychloride to give 11-chloro-dibenzothiazepineDerivatives thereof, followed by addition of piperazine to the 11-chloro-dibenzothiazepineOn derivatives thereofTo obtain 11-piperazinyl-dibenzothiazepineDerivatives, finally the 11-piperazinyl-dibenzothiazepineThe derivative is reacted with 2-chloroethoxyethanol under alkaline conditions to obtain the 11- [ 4- (2- (2-hydroxyethoxy) ethyl ] -1-piperazinyl dibenzothiazepineAnd (3) derivatives.

In the above-mentioned EP-0282236-A1 publication, the sulfur nitrogen is dibenzo [ b, f ] [ 1, 4 ] sulfur nitrogenA process for producing (E) -11-one, which comprises cyclizing 2- (phenylthio) phenylcarbamate or the like in the presence of polyphosphoric acid.

Helv. Chim. acta, volume 42, page 1263 (1959) describes the preparation of dibenzothiazepine by reacting a methyl thiosalicylate derivative with a 2-halonitrobenzene derivative in the presence of sodium under heating to synthesize a 2-nitro-2 '-carboxy-diphenyl sulfide derivative, reducing the 2-nitro-2' -carboxy-diphenyl sulfide derivative with Raney nickel, and finally reacting the derivative at high temperatureA method for the derivation.

Org.prep. proced.int, p.287 (1974) describes that a thiosalicylate derivative and a 2-iodonitrobenzene derivative are heated in the presence of sodium methoxide and copper, then subjected to alkali and acid treatment to synthesize a 2-nitro-2 '-carboxy-phenylene sulfide derivative, which is reduced with an aqueous ammonia solution of ferrous sulfate to give a 2-amino-2' -carboxy-phenylene sulfide derivative, and finally heated under reduced pressureReacting the resulting mixture to produce dibenzothiazepineA method for the derivation.

WO92/19607 discloses that dibenzothiazepine of the general formula (5) can be produced by reacting 2-aminothiophenol with 2-fluorobenzonitrile to give 2- (2-aminothiophenyl) benzonitrile, hydrolyzing the compound to give 2- (2-carboxythiophenyl) aniline, and subjecting the compound to cyclization reactionA method for the derivation.

As described above, as the dibenzothiazepine of the general formula (5)Although several methods are known for producing derivatives, these methods have problems that the yield is low, a high-temperature reaction is required, a special raw material is required, or a compound which is troublesome in industrial post-treatment is used as an industrial production method which needs to be improved.

DISCLOSURE OF THE INVENTION

Accordingly, it is an object of the present invention to provide an industrially effective process for producing dibenzothiazepine of the above general formula (5)Derivative processes, i.e., using readily available starting compounds, without complicated workup, and yield the desired dibenzothiazepine in high yieldA preparation method of the derivative.

The present inventors have made diligent studies to solve the above problems and as a result, have found that the use is easyThe obtained nitrobenzene derivative and thiosalicylic acid derivative can prepare the dibenzothiazepine of the general formula (5) in high yield and by simple operationA novel method for producing the derivative, thereby completing the present invention.

The present invention relates to a dibenzothiazepine represented by the following general formula (5)A process for producing a derivative, which comprises reacting a nitrobenzene derivative represented by the general formula (1) with a thiosalicylic acid derivative represented by the general formula (2) to produce a 2-nitro-2 '-carboxy-phenylene sulfide derivative represented by the general formula (3), reducing the 2-nitro-2' -carboxy-phenylene sulfide derivative to produce a 2-amino-2 '-carboxy-phenylene sulfide derivative represented by the general formula (4), and then subjecting the 2-amino-2' -carboxy-phenylene sulfide derivative to dehydration condensation.

(in the formula, R¹、R²、R³And R⁴May be the same or different, represents a hydrogen atom or an alkyl, alkoxy, alkylcarbonyl, aryl, aryloxy or arylcarbonyl group which may have a substituent, and X represents a halogen atom)

(in the formula, R⁵、R⁶、R⁷And R⁸May be the same or different and represents a hydrogen atom or an alkyl, alkoxy, alkylcarbonyl, aryl, aryloxy or arylcarbonyl group which may have a substituent

(in the formula, R¹、R²、R³、R⁴、R⁵、R⁶、R⁷And R⁸Means the same as above)

(in the formula, R¹、R²、R³、R⁴、R⁵、R⁶、R⁷And R⁸Means the same as above)

(in the formula, R¹、R²、R³、R⁴、R⁵、R⁶、R⁷And R⁸Means the same as above)

The present invention also relates to a dibenzothiazepine represented by the following general formula (5)A process for producing a derivative, which comprises reducing a 2-nitro-2 ' -carboxy-phenylene sulfide derivative represented by the following general formula (3) to give a 2-amino-2 ' -carboxy-phenylene sulfide derivative represented by the following general formula (4), and then subjecting the 2-amino-2 ' -carboxy-phenylene sulfide derivative to dehydration condensation.

(in the formula, R¹、R²、R³、R⁴、R⁵、R⁶、R⁷And R⁸May be the same or different and represents a hydrogen atom or an alkyl, alkoxy, alkylcarbonyl, aryl, aryloxy or arylcarbonyl group which may have a substituent

(in the formula, R¹、R²、R³、R⁴、R⁵、R⁶、R⁷And R⁸Means the same as above)

(in the formula, R¹、R²、R³、R⁴、R⁵、R⁶、R⁷And R⁸Means the same as above)

The present invention also relates to 2-nitro-2' -carboxy-phenylsulfide derivatives represented by the above general formula (3).

The dibenzothiazepine of the general formula (5) of the present inventionThe steps of the preparation process of the derivatives can be represented by the following reaction schemes.

Best mode for carrying out the invention

Dibenzothiazepine of the inventionThe preparation method of the derivative relates to the general formula in R¹To R⁸The "alkyl group which may have a substituent" means a linear or branched alkyl group having 1 to 10 carbon atoms which has no substituent, or a linear or branched alkyl group having 1 to 10 carbon atoms which has a substituent.

The "linear or branched alkyl group having 1 to 10 carbon atoms which has no substituent(s)" is preferably a linear or branched alkyl group having 1 to 8 carbon atoms (particularly 1 to 5 carbon atoms), such as methyl, ethyl, propyl (including isomers), butyl (including isomers), pentyl (including isomers), hexyl (including isomers), heptyl (including isomers), octyl (including isomers), nonyl (including isomers), decyl (including isomers) and the like, preferably methyl, ethyl, propyl (including isomers), butyl (including isomers), pentyl (including isomers), hexyl (including isomers), heptyl (including isomers), octyl (including isomers), particularly preferred are methyl, ethyl, propyl (including isomers), butyl (including isomers), and pentyl (including isomers).

The alkyl moiety of the "linear or branched alkyl group having 1 to 10 carbon atoms and having a substituent" is, for example, the alkyl group described in the above (1).

The substituent of the "linear or branched alkyl group having 1 to 10 carbon atoms and having a substituent" may be located at any position of the alkyl moiety. Examples of such a substituent include a linear or branched alkoxy group having 1 to 10 carbon atoms such as a methoxy group, an ethoxy group, a propoxy group (including isomers), a butoxy group (including isomers), a pentyloxy group (including isomers), a hexyloxy group (including isomers), a heptyloxy group (including isomers), an octyloxy group (including isomers), a nonyloxy group (including isomers), and a decyloxy group (including isomers), an alkylcarbonyl group having 2 to 6 carbon atoms and having a linear or branched alkyl moiety having 1 to 5 carbon atoms such as an acetyl group, a propionyl group (including isomers), a butyryl group (including isomers), and a valeryl group, a phenylcarbonyl group which may be substituted, and a phenyl group which may be substituted.

The "optionally substituted phenylcarbonyl" refers to an unsubstituted phenylcarbonyl group or a substituted phenylcarbonyl group. "phenyl group which may be substituted" means a phenyl group having no substituent or a phenyl group having a substituent. Examples of the substituent for the "substituted phenylcarbonyl group" or the "substituted phenyl group" include a phenyl group, a phenylcarbonyl group, the above alkyl group, the above alkoxy group, and the above alkylcarbonyl group.

In the present invention, R in the above general formulae (2), (3), (4) and (5)¹To R⁸The "alkoxy group which may have a substituent" means an alkoxy group having 1 to 10 carbon atoms and having a linear or branched alkyl moiety having 1 to 10 carbon atoms and no substituent, or an alkoxy group having 1 to 10 carbon atoms and having a linear or branched alkyl moiety having 1 to 10 carbon atoms and a substituent.

The "alkoxy group having 1 to 10 carbon atoms having a linear or branched alkyl moiety having 1 to 10 carbon atoms and no substituent" may, for example, be the above-mentioned alkoxy group. Examples of the substituent for the "alkoxy group having 1 to 10 carbon atoms and having a linear or branched alkyl moiety having 1 to 10 carbon atoms as the substituent" include the above-mentioned alkyl group, alkylcarbonyl group having 2 to 6 carbon atoms, optionally substituted phenylcarbonyl group and optionally substituted phenyl group.

Dibenzothiazepine of the inventionThe preparation method of the derivative relates to the general formula in R¹To R⁸The expression "alkylcarbonyl group which may have a substituent" means having no substituentAn alkylcarbonyl group having 2 to 11 carbon atoms having a linear or branched alkyl moiety having 1 to 10 carbon atoms, or an alkylcarbonyl group having 2 to 11 carbon atoms having a linear or branched alkyl moiety having 1 to 10 carbon atoms and having a substituent.

Examples of the alkyl moiety of the "alkylcarbonyl group having 2 to 11 carbon atoms and having a linear or branched alkyl moiety having 1 to 10 carbon atoms without a substituent" include the above-mentioned alkyl groups. Examples of the substituent for the "alkylcarbonyl group having 2 to 11 carbon atoms and having a linear or branched alkyl group having 1 to 10 carbon atoms as a substituent" include the substituents for the above alkyl group.

Dibenzothiazepine of the inventionThe preparation method of the derivative relates to the general formula in R¹To R⁸The "aryl group which may have a substituent" means an aryl group having no substituent or an aryl group having a substituent.

The "unsubstituted aryl" is, for example, phenyl, naphthyl or anthryl, and preferably phenyl or naphthyl, and particularly preferably phenyl. Examples of the substituent for the "substituted aryl" include the substituents for the above-mentioned alkyl groups.

Dibenzothiazepine of the inventionThe preparation method of the derivative relates to the general formula in R¹To R⁸The "aryloxy group which may have a substituent" means an aryloxy group having an aryl moiety without a substituent, or an aryloxy group having an aryl moiety with a substituent.

As the above-mentioned aryl group "aryloxy group having aryl moiety without substituent", for example, the above-mentioned aryl group is mentioned. Further, as the substituent of the "aryloxy group having a substituted aryl moiety", for example, the above-mentioned substituent of the alkyl group is mentioned.

Dibenzothiazepine of the inventionThe preparation method of the derivative relates to the general formula in R¹To R⁸The "arylcarbonyl group which may have a substituent" means an arylcarbonyl group having an aryl moiety without a substituent, or an arylcarbonyl group having an aryl moiety with a substituent.

As the above-mentioned aryl group as "arylcarbonyl group having aryl moiety without substituent", for example, the above-mentioned aryl group is mentioned. Examples of the substituent for the "arylcarbonyl group having a substituted aryl moiety" include the above-mentioned substituents for the alkyl group.

R¹To R⁸Which may be the same or different, is preferably a hydrogen atom, an alkyl group, an alkoxy group, an alkylcarbonyl group, an aryl group, an aryloxy group or an arylcarbonyl group, and particularly preferably a hydrogen atom, an alkyl group, an alkoxy group or an alkylcarbonyl group.

The halogen atom represented by X in the general formula (1) is, for example, a fluorine atom, a chlorine atom, a bromine atom or an iodine atom, and a fluorine atom, a chlorine atom or a bromine atom is preferable.

Second, the dibenzothiazepine of the present inventionThe steps of the preparation process of the derivatives are explained in detail.

Dibenzothiazepine of the inventionIn the 1 st step of the process for producing the derivative, the 2-nitro-2' -carboxy-phenylsulfide derivative represented by the general formula (3) is produced by reacting a nitrobenzene derivative represented by the general formula (1) with a thiosalicylic acid derivative represented by the general formula (2) in a solvent preferably in the presence of a base.

As specific examples of the nitrobenzene derivative of the general formula (1) used in the above-mentioned step 1, there may be mentioned 2-chloronitrobenzene, 2-bromonitrobenzene, 2-fluoronitrobenzene, 2-iodonitrobenzene, 2-chloro-5-methoxy-nitrobenzene, 2-bromo-5-methoxy-nitrobenzene, 2-fluoro-5-methoxy-nitrobenzene, 2-iodo-5-methoxy-nitrobenzene, 2-chloro-5-methyl-nitrobenzene, 2-bromo-5-methyl-nitrobenzene, 2-fluoro-5-methyl-nitrobenzene, 2-iodo-5-methyl-nitrobenzene, 2-chloro-5-phenyl-nitrobenzene, 2-chloro-5-methyl-nitrobenzene, 2-bromo, 2-bromo-5-phenyl-nitrobenzene, 2-fluoro-5-phenyl-nitrobenzene, 2-iodo-5-phenyl-nitrobenzene, 2-chloro-5-acetyl-nitrobenzene, 2-bromo-5-acetyl-nitrobenzene, 2-fluoro-5-acetyl-nitrobenzene and 2-iodo-5-acetyl-nitrobenzene, preferably 2-chloronitrobenzene and 2-bromonitrobenzene.

As specific examples of the thiosalicylic acid derivative of the general formula (2) used in the 1 st step, there are exemplified thiosalicylic acid, 5-methoxy-thiosalicylic acid, 5-methyl-thiosalicylic acid, 5-phenyl-thiosalicylic acid and 5-acetyl-thiosalicylic acid, and thiosalicylic acid and 5-methoxythiosalicylic acid are preferable.

The nitrobenzene derivative of the general formula (1) is usually used in an amount of 0.7 to 10 mol, and particularly preferably in an amount of 1.0 to 5 times by mol, based on 1 mol of the thiosalicylic acid derivative of the general formula (2).

The above-mentioned step 1 is usually carried out in the presence of a solvent. The solvent used in the step 1 is not particularly limited as long as it is not involved in the reaction, and examples thereof include amide-based organic solvents such as water, N-dimethylformamide, N-dimethylacetamide, N-methylpyrrolidone, and dimethylimidazolidinone, aliphatic alcohol-based organic solvents such as methanol, ethanol, N-propanol, isopropanol, and N-butanol, ketone-based organic solvents such as acetone, methyl ethyl ketone, and methyl isobutyl ketone, and nitrile-based organic solvents such as acetonitrile and benzonitrile. Water, amide organic solvents and aliphatic alcohol organic solvents are preferred.

The solvent of the step 1 is preferably used in an amount such that the ratio of the weight of the nitrobenzene derivative of the general formula (1) to the weight of the solvent "weight of nitrobenzene derivative/weight of solvent" falls within a range of 0.05 to 1.0, and particularly preferably within a range of 0.1 to 0.8.

The reaction temperature in the step 1 may be a temperature not higher than the boiling point of the solvent used in general, and is preferably in the range of 0 to 150 ℃, particularly preferably in the range of 20 to 100 ℃. The reaction time in the 1 st step is significantly affected by the reaction temperature, and the reaction is usually completed within 20 hours.

The reaction of step 1 is generally carried out in the presence of a base. As the base preferably used in this 1 st step, for example, potassium carbonate, sodium carbonate, lithium carbonate, sodium hydroxide, potassium hydroxide, lithium hydroxide and sodium methoxide are preferable, and potassium carbonate, sodium hydroxide, potassium hydroxide and sodium methoxide are particularly preferable. These bases are preferably used in an amount of 1 to 10 times by mol, particularly preferably 1.5 to 5 times by mol, based on the total amount of the starting material compounds.

In the reaction of the step 1, an additive for accelerating the reaction may be further added in addition to the base, and examples of such an additive include potassium iodide and N, N-dimethylaminopyridine. In this case, the amount of the additive to be used is preferably in a ratio of 0.0005 to 0.5 (mol number of additive/mol number of nitrobenzene derivative) in terms of a molar ratio to the nitrobenzene derivative of the formula (1), and particularly preferably in a ratio of 0.001 to 0.1 (the same).

The chemical structure of the 2-nitro-2 '-carboxy-phenylsulfide derivative of the general formula (3) obtained in the first step of the production process of the present invention is determined by the chemical structure of the nitrobenzene derivative of the general formula (1) and the chemical structure of the thiosalicylic acid derivative of the general formula (2), but as the 2-nitro-2' -carboxy-phenylsulfide derivative, for example, 2-nitro-2 '-carboxy-phenylsulfide, 2-nitro-4-methoxy-2' -carboxy-phenylsulfide, 2-nitro-4-methyl-2 '-carboxy-phenylsulfide, 2-nitro-4-phenyl-2' -carboxy-phenylsulfide, 2-nitro-4-acetyl-2 '-carboxy-phenylsulfide and 2-nitro-2' -carboxy-4' -methoxy-phenylsulfide. 2-nitro-2 ' -carboxy-phenylsulfide and 2-nitro-2 ' -carboxy-4 ' -methoxy-phenylsulfide are preferred.

In the case of recovering the 2-nitro-2' -carboxy-phenylsulfide derivative of the general formula (3) produced in the step 1, a conventional washing operation and a separation operation may be combined, for example, by a method of adding an acid to the reaction mixture to make it acidic and filtering the precipitated crystals to obtain a crude product, or a method of adding water and an extraction solvent (organic solvent) to the reaction solution and adding an acid thereto to adjust the pH of the aqueous layer to acidic. Alternatively, the organic layer may be concentrated under reduced pressure to obtain a crude product. In general, there is no problem when the purification is carried out in the following step in such a state, and the purification may be carried out by column chromatography or recrystallization in the case of further purification. The specific purification method is preferably selected as appropriate for each compound. As the acid used in the above treatment, hydrochloric acid, sulfuric acid, phosphoric acid and acetic acid are preferable.

The 2 nd step in the production process of the present invention is a process for producing 2-amino-2 '-carboxy-phenylene sulfide of the general formula (4) by reducing 2-nitro-2' -carboxy-phenylene sulfide derivative of the general formula (3).

The reduction operation used in the step 2 is not particularly limited as long as it is an operation used in general reduction of a nitro group, and is preferably performed by the raney nickel method (hereinafter referred to as reaction (a)), the ferrocenium method (hereinafter referred to as reaction (B)), or a method using palladium, platinum, or a compound thereof (hereinafter referred to as reaction (C)). As a hydrogen supply source in the reduction reaction, hydrogen gas is generally used.

Reaction (A): raney nickel process

The amount of raney nickel used in the process is generally 1.0 to 80% by weight, preferably 5.0 to 40% by weight, based on the amount of nickel, relative to the 2-nitro-2' -carboxy-phenylene sulfide derivative of the general formula (3). The type of Raney nickel that can be used is, for example, a Ni-Al alloy of 10 to 60%. Further, an alloy in which Cr and Mo are added as an additive may be used. Stabilized nickel may also be used. Although the yield was not significantly affected by changing the method of development of Raney nickel, the best results were obtained by the known W-6 method (cf. Tokusho-Kao, Mitsuokang, "Raney catalyst", Chuanmo Fine chemical Co., Showa 46.5/10/55). Of course, sufficient activity was shown even with other development methods. The reaction by the Raney nickel method is generally carried out under hydrogen pressure, and therefore, is carried out in an autoclave. The higher the hydrogen pressure, the better the results obtained, and is generally carried out at 5 to 100 atmospheres. The reaction may be carried out under normal pressure while allowing hydrogen gas to flow therethrough.

The solvent used in the reaction (a) is not particularly limited as long as it is a solvent that does not participate in the reaction, and is preferably an aliphatic alcohol organic solvent such as methanol, ethanol, n-propanol, isopropanol, or n-butanol. The ratio of the solvent to the 2-nitro-2 '-carboxy-phenylsulfide derivative of the general formula (3) is preferably in the range of 0.05 to 0.6 times (weight of the 2-nitro-2' -carboxy-phenylsulfide derivative per volume of the solvent), and particularly preferably in the range of 0.1 to 0.6 times (the same).

The reaction temperature in the reaction (A) may be a temperature not higher than the boiling point of a solvent usually used, and is preferably in the range of 20 to 200 ℃ and particularly preferably in the range of 25 to 150 ℃. The reaction time is significantly affected by the reaction temperature and hydrogen pressure, and the reaction is usually completed within 20 hours.

Recovery of the 2-amino-2' -carboxy-phenylsulfide derivative of the general formula (4) produced after the reduction treatment by the reaction (A) can be carried out by combining a conventional washing operation and a separation operation, for example, by filtering the reaction mixture and concentrating the obtained filtrate under reduced pressure to obtain a crude product. In general, there is no problem when the compound is used in the following step in this state, and purification by column chromatography or recrystallization operation is sufficient for further purification, and it is preferable to select each compound appropriately for the purification method.

Reaction (B): ferrous salt process

Examples of the ferrous salt used in this method include ferrous sulfate and ferrous chloride, and such a ferrous salt can be used in either a hydrated state or an anhydrous state. Ferrous sulfate 7 hydrate, anhydrous ferrous chloride, ferrous chloride 4 hydrate, and ferrous chloride n hydrate are preferable. The amount of these compounds used is in the range of 0.1 to 30 times by weight, preferably 0.5 to 10 times by weight, as the amount of iron atom, relative to the 2-nitro-2' -carboxy-phenylsulfide derivative of the general formula (3).

As the solvent used in the reaction (B), a mixed solvent of water and aqueous ammonia is generally used. The ammonia water to be used is usually concentrated ammonia water (ammonia concentration is 25 to 28% by weight), and as long as the amount of ammonia contained is sufficient, ammonia water having a lower concentration may be used, or ammonia gas may be introduced into water. As for water, the amount of the 2-nitro-2 '-carboxy-phenylsulfide derivative of the general formula (3) to water is preferably in the range of 0.01 to 0.4 equivalent (weight of 2-nitro-2' -carboxy-phenylsulfide derivative/volume of water), and particularly preferably in the range of 0.02 to 0.2 equivalent (same). Regarding ammonia, the amount of the 2-nitro-2 '-carboxy-phenylene sulfide derivative to be used is preferably in the range of 0.005 to 0.5 equivalent (weight of 2-nitro-2' -carboxy-phenylene sulfide derivative/weight of ammonia), and particularly preferably in the range of 0.01 to 0.5 equivalent (the same).

The reaction temperature in the reaction (B) may be a temperature not higher than the boiling point of a solvent usually used, and is preferably in the range of 20 to 100 ℃ and particularly preferably in the range of 40 to 90 ℃. The reaction time is significantly affected by the reaction temperature, and the reaction is usually completed within 2 hours.

The recovery of the 2-amino-2' -carboxy-phenylsulfide derivative of the general formula (4) produced after the reduction treatment in the reaction (B) can be carried out by a method in which a conventional washing operation and a separation operation are combined, for example, a method in which the reaction mixture is filtered and an acid (for example, hydrochloric acid, sulfuric acid, phosphoric acid, or acetic acid) is added to the filtrate to adjust the pH to the acidic side, or the like. The filtrate obtained by concentration under reduced pressure can be used to obtain the desired compound as a crude product. In general, there is no problem even when such a crude product is used in the following step, and purification may be carried out by column chromatography or recrystallization operation in the case of further purification, and it is preferable to appropriately select each compound as a purification method.

Reaction (C): methods of using palladium or platinum (or compounds thereof)

In this method, palladium (Pd) or platinum (Pt) is used as a reduction catalyst (hydrogenation catalyst). The palladium or platinum used may be a monomer of palladium or platinum, or a compound thereof. In addition, a monomer or compound of palladium or platinum is usually used in a state of being supported on a surface of a carrier such as carbon (C) or barium sulfate. Pd/C, Pd/barium sulfate and platinum oxide are preferred, with Pd/C being particularly preferred.

The amount of the catalyst containing palladium or platinum is preferably in the range of 0.01 to 30% by weight, particularly preferably in the range of 0.05 to 10% by weight, in terms of the weight of the palladium or platinum monomer, relative to the amount of the 2-nitro-2' -carboxy-phenylene sulfide derivative of the general formula (3). The amount of palladium or platinum supported on the catalyst carrier (in the case of palladium or platinum compounds, the amount is preferably in the range of 1 to 10% by weight in terms of the weight of each metal monomer). In the case of using Pd/C, a dry product having a moisture content of 5% or less, which is generally called a dry product, may be used, and a wet product having a moisture content of 5% or more, which is called a wet product, may be used. Examples of the aqueous product include those having a water content of 10 to 70 wt% (a ratio of the water content to the total amount of the catalyst).

In the reaction (C), when platinum oxide is used as a reduction catalyst, the amount of platinum oxide to be used is preferably in the range of 0.1 to 50% by weight, and particularly preferably in the range of 1 to 30% by weight, relative to the amount of the 2-nitro-2' -carboxy-phenylene sulfide derivative of the general formula (3).

Reaction (C) is generally carried out under hydrogen pressure. Thus, the reaction is usually carried out in an autoclave. The higher the hydrogen pressure, the better the result obtained, and generally, the hydrogen pressurization condition of 2 to 100 atm is used. The reaction may be carried out under normal pressure, and in this case, the reduction reaction (hydrogenation reaction) may be carried out while passing hydrogen gas therethrough.

The reaction (C) is usually carried out in the presence of a solvent. The solvent used in the reaction (C) is not particularly limited as long as it is not involved in the reaction, and examples thereof include aliphatic alcohol organic solvents such as methanol, ethanol, N-propanol, isopropanol and N-butanol, and amide organic solvents such as N, N-dimethylformamide, N-dimethylacetamide, N-methylpyrrolidone and dimethylimidazolidinone. Among them, aliphatic alcohol-based organic solvents are preferable. These solvents are preferably used in an amount of 2 to 70% by weight, particularly preferably 5 to 50% by weight, based on the 2-nitro-2' -carboxy-phenylsulfide derivative of the general formula (3).

The reaction (C) is usually carried out at a temperature in the range of 10 to 200 ℃, and a reaction temperature in the range of 20 to 150 ℃ is particularly preferably used. The reaction time is greatly affected by the reaction temperature and the hydrogen pressure, and a reaction time of 30 hours or less is generally used.

The recovery of the 2-amino-2' -carboxy-phenylsulfide derivative of the general formula (4) produced after the reduction treatment (hydrotreatment) by the reaction (C) can be carried out by a method of combining a conventional washing operation and a separation operation, for example, a method of filtering the reaction mixture and concentrating the obtained filtrate under reduced pressure to obtain a crude product. In general, there is no problem when the compound is used in the following step in this state, and purification by column chromatography or recrystallization operation is sufficient for further purification, and it is preferable to select each compound appropriately for the purification method.

The chemical structure of the 2-amino-2 '-carboxy-phenylene sulfide derivative of the general formula (4) obtained in the 2 nd step (reduction step) of the production method of the present invention is determined by the chemical structure of the 2-nitro-2' -carboxy-phenylene sulfide derivative of the general formula (3) used as a reaction raw material in the 2 nd step. As examples of the 2-amino-2 '-carboxy-phenylene sulfide derivative of the general formula (4), for example, 2-amino-2' -carboxy-phenylene sulfide, 2-amino-4-methoxy-2 '-carboxy-phenylene sulfide, 2-amino-4-methyl-2' -carboxy-phenylene sulfide, 2-amino-4-phenyl-2 '-carboxy-phenylene sulfide, 2-amino-4-acetyl-2' -carboxy-phenylene sulfide and 2-amino-2 '-carboxy-4' -methoxy-phenylene sulfide. 2-amino-2 ' -carboxy-phenylsulfide and 2-amino-2 ' -carboxy-4 ' -methoxy-phenylsulfide are preferred.

The 3 rd step of the preparation process of the present invention is to dehydrate the 2-amino-2' -carboxy-phenylsulfide derivative of the general formula (4)Condensation to produce a dibenzothiazepine of the formula (5)A method for the derivation.

The reaction of the 3 rd step may be carried out without a solvent, but is preferably carried out using an organic solvent which is hydrophobic and inert to the reaction. Examples of such organic solvents include aromatic hydrocarbon solvents such as toluene, xylene, cumene and benzene, aromatic halide solvents such as chlorobenzene, 1, 2-dichlorobenzene, 1, 3-dichlorobenzene, 1, 4-dichlorobenzene, bromobenzene, 1, 2-dibromobenzene, 1, 3-dibromobenzene and 1, 4-dibromobenzene, cyclic hydrocarbon solvents such as cyclohexane, cycloheptane and cyclooctane, and aliphatic ester solvents such as ethyl acetate, butyl acetate, methyl butyrate, ethyl butyrate and butyl butyrate. Toluene, xylene, cumene and 1, 2-dichlorobenzene are particularly preferred.

The amount of the solvent used in the 3 rd step is not particularly limited, and the volume ratio (W/V%) of the solvent to the weight of the 2-amino-2' -carboxy-phenylsulfide derivative of the general formula (4) is preferably 3% or more, and particularly preferably in the range of 4 to 40%. In order to increase the reaction rate and the conversion in the 3 rd step, an azeotropic dehydration operation (an operation of refluxing while removing the produced water) may be performed using a Dean-Stark apparatus. The reaction temperature in the step 3 is not particularly limited as long as it is not higher than the boiling point of the organic solvent used, and is preferably in the range of 100 to 200 ℃.

The dibenzothiazepine of the general formula (5) obtained in step 3The chemical structure of the derivative is determined by the chemical structure of the 2-amino-2' -carboxy-phenylsulfide derivative of the general formula (4). Dibenzothiazepine of the general formula (5)Derivatives, e.g. dibenzo [ b, f ] -1, 4-thiazepine-11-one, 8-methyl-dibenzo [ b, f ] [ 1, 4 ] thiazepine-11-one, 8-phenyl-dibenzo [ b, f ] [ 1, 4 ] thiazepine-11-one, 8-methoxy-dibenzo [ b, f ] [ 1, 4 ] thiazepine-11-one and 2-methoxy-dibenzo [ b, f ] -1, 4 ] thiaza-11-ketone. Dibenzo [ b, f ] -1, 4 ] thiazepine is preferred-11-one and 2-methoxy-dibenzo [ b, f ] [ 1, 4 ] thiazepine-11-ketone.

The dibenzothiazepine of the general formula (5) formed in step 3The derivative can be recovered by cooling the reaction mixture to make the dibenzothiazepineThe method of crystal precipitation of the derivative is easily carried out. Therefore, the dibenzothiazepine can be obtained in high purity by filtering the crystalsAnd (3) derivatives. When further purification is necessary, recrystallization may be carried out, or column chromatography may be employed. Alternatively, the reaction mixture may be subjected to addition of an aqueous alkaline solution before crystallizing the reaction mixture, separation of an aqueous layer, and cooling to crystallize the dibenzothiazepineA method for crystallizing the derivative. As examples of the basic compound used in preparing the basic aqueous solution used in this operation, sodium hydrogencarbonate, sodium carbonate, potassium carbonate, sodium hydroxide and potassium hydroxide are given. The concentration of the alkaline compound in the alkaline aqueous solution is preferably in the range of 0.5 to 30% by weight. The amount of the aqueous alkaline solution to be used is not particularly limited, but is preferably selected from the dibenzothiazepine of the product of step 3 (general formula (5))Derivative) is used in an amount of about 0.05 to 0.4 times by weight.

Preferred embodiments of the present invention are as follows.

(1) The nitrobenzene derivative of the general formula (1) is 2-chloronitrobenzene or 2-bromonitrobenzene.

(2) The thiosalicylic acid derivative of the general formula (2) is thiosalicylic acid or 5-methoxy thiosalicylic acid.

(3) Dibenzothiazepine of the inventionIn step 1 of the process for the preparation of the derivatives, a base selected from potassium carbonate, sodium hydroxide and sodium methoxide is used.

(4) The 2-nitro-2 '-carboxy-phenylsulfide derivative of the general formula (3) is 2-nitro-2' -carboxy-phenylsulfide or 2-nitro-2 '-carboxy-4' -methoxy-phenylsulfide.

(5) Dibenzothiazepine of the inventionIn the 1 st step of the process for producing the derivative, N-dimethylformamide or methanol is used as a reaction solvent.

(6) Dibenzothiazepine of the inventionIn the reduction reaction in the 2 nd step of the preparation method of the derivative, raney nickel is used as a reducing agent, and methanol or n-butanol is used as a solvent.

(7) Dibenzothiazepine of the inventionIn the reduction reaction in the 2 nd step of the process for producing a derivative, ferrous sulfate 7 hydrate is used as a reducing agent, and an aqueous ammonia solution is used as a solvent.

(8) Dibenzothiazepine of the inventionThe reduction reaction in the 2 nd step of the derivative production method is carried out in the presence of any one of Pd/C, Pd/barium sulfate or platinum oxide reduction catalysts using methanol or ethanol as a solvent.

(9) The 2-amino-2 '-carboxy-phenylsulfide derivative of the general formula (4) is 2-amino-2' -carboxy-phenylsulfide, 2-amino-2 '-carboxy-4' -methoxy-phenylsulfide or 2-methoxy-dibenzo [ b, f ] [ 1, 4 ] thiazepine-11-ketone.

(10) A dibenzothiazepine represented by the general formula (5)The derivative being dibenzo [ b, f ] -1, 4-azothion-11-one or 2-methoxy-dibenzo [ b, f ] [ 1, 4 ] thiazepine-11-ketone.

(11) The nitrobenzene derivative of the general formula (1) used as the starting material for the reaction in the 1 st step is 2-chloronitrobenzene or 2-bromonitrobenzene; further, as the thiosalicylic acid derivative of the general formula (2), thiosalicylic acid or 5-methoxythiosalicylic acid; as base, potassium carbonate was used; as the solvent, N-dimethylformamide was used; 2-nitro-2 '-carboxyphenylsulfide or 2-nitro-2' -carboxy-4 '-methoxyphenylsulfide as a 2-nitro-2' -carboxy-phenylsulfide derivative of the general formula (3) is prepared.

(12) 2-amino-2 '-carboxy-phenylene sulfide or 2-amino-2' -carboxy-4 '-methoxy-phenylene sulfide, which is a 2-amino-2' -carboxy-phenylene sulfide derivative of the general formula (4), is prepared as a reaction raw material of the 2 nd step by reducing 2-nitro-2 '-carboxy-4' -methoxy-phenylene sulfide or 2-nitro-2 '-carboxy-4' -methoxy-phenylene sulfide with hydrogen gas in the presence of platinum, palladium or a compound thereof.

(13) The dibenzothiazepine of the general formula (5) is prepared using 2-amino-2 ' -carboxy-phenylsulfide or 2-amino-2 ' -carboxy-4 ' -methoxy-phenylsulfide as the starting material for the reaction in step 3Dibenzo [ b, f ] -1, 4 ] thiazepine derivatives-11-one or 2-methoxy-dibenzo [ b, f ] [ 1, 4 ] thiazepine-11-ketone.

The production method of the present invention will be described in more detail below with reference to examples of the present invention and comparative examples, but the present invention is not limited to these examples.

[ example 1 ]

94.5g (0.60 mol) of 2-chloronitrobenzene and 159.0g (1.15 mol) of potassium carbonate were dissolved in 120mL of N, N-dimethylformamide. To the obtained N, N-dimethylformamide solution, a solution prepared by dissolving 77.1g (0.50 mol) of thiosalicylic acid in 120mL of N, N-dimethylformamide was added dropwise, and the mixture was stirred at 70 ℃ for 6 hours to effect a reaction. To the resulting reaction mixture were added 800mL of water and 700mL of ethyl acetate. To the separated aqueous layer were added ice 400g and concentrated hydrochloric acid 194mL to adjust the pH of the aqueous layer to acidic, and then the solution was stirred at room temperature for 1 hour. The precipitated crystals were filtered and dried to obtain 134.0g (0.49 mol) of 2-nitro-2' -carboxy-phenylsulfide as a yellow powder. (yield based on thiosalicylic acid: 98%)

¹H-NMR(DMSO-d₆)：δ

7.1～8.3(m，8H)、13.1～13.5(br，1H)

[ example 2 ]

94.5g (0.60 mol) of 2-chloronitrobenzene and 159.0g (1.15 mol) of potassium carbonate were dissolved in 120mL of N, N-dimethylformamide. To the obtained N, N-dimethylformamide solution, a solution prepared by dissolving 77.1g (0.50 mol) of thiosalicylic acid in 120mL of N, N-dimethylformamide was added dropwise, and the mixture was stirred at 70 ℃ for 6 hours to effect a reaction. To the resulting reaction solution were added 200mL of water and 194mL of concentrated hydrochloric acid to adjust the pH of the aqueous layer to acidic, and then the solution was stirred at room temperature for 1 hour. The precipitated crystals were filtered and dried to obtain 123.0g (0.45 mol) of 2-nitro-2' -carboxy-phenylsulfide as a yellow powder. (yield based on thiosalicylic acid: 90%)

[ example 3 ]

The same procedures used in example 1 were repeated except for using 2-bromonitrobenzene instead of 2-chloronitrobenzene and changing the amount used to 121.2g (0.60 mol), to obtain 134.0g (0.49 mol) of 2-nitro-2' -carboxy-phenylsulfide. (yield based on thiosalicylic acid: 98%)

[ example 4 ]

The same procedures used in example 1 were repeated except for using 5-methoxythiosalicylic acid instead of thiosalicylic acid in an amount of 93.8g (0.50 mol) to obtain 137.3g (0.45 mol) of 2-nitro-2 '-carboxy-4' -methoxy-phenylsulfide. (yield relative to 5-methoxythiosalicylic acid: 90%). Melting point: 185-187 deg.C

[ example 5 ]

The same operations as in example 1 were carried out except for changing the solvent from N, N-dimethylformamide to methanol and changing the reaction temperature and time to 64 ℃ and 2 hours, to give 131.3g (0.48 mol) of 2-nitro-2' -carboxy-phenylsulfide. (yield based on thiosalicylic acid: 96%)

[ example 6 ]

The same procedures used in example 5 were repeated except for changing the amount of potassium carbonate to sodium hydroxide and 46.0g (1.15 mol) of potassium carbonate to obtain 130.0g (0.47 mol) of 2-nitro-2' -carboxy-phenylsulfide. (yield based on thiosalicylic acid: 94%)

[ example 7 ]

The same procedures as in example 5 were repeated except for changing the amount of potassium carbonate to sodium methoxide and sodium methoxide to 62.1g (1.15 mol) and changing the reaction time to 5 hours to obtain 131.8g (0.48 mol) of 2-nitro-2' -carboxy-phenylsulfide. (yield based on thiosalicylic acid: 96%)

[ example 8 ]

The same procedures as in example 7 were carried out except that 3.9g (0.02 mol) of potassium iodide was previously added to the reaction solution to obtain 133.8g (0.49 mol) of 2-nitro-2' -carboxy-phenylsulfide. (yield based on thiosalicylic acid: 97%)

[ example 9 ]

Raney nickel (Ni content: 4g as a 50% alloy), 13.8g (0.05 mol) of 2-nitro-2' -carboxy-phenylsulfide obtained by the method of example 1, and 100mL of methanol were charged into a 300mL autoclave, and the mixture was stirred at room temperature for 5 hours after adjusting the hydrogen pressure to 20 atmospheres. The resulting reaction solution was filtered, and the filtrate was concentrated under reduced pressure to give 11.3g (0.046 mol) of 2-amino-2' -carboxy-phenylsulfide as a colorless powder. (yield based on 2-nitro-2' -carboxy-phenylsulfide: 92%)

¹H-NMR(DMSO-d₆)：δ

5.0～5.9(br，2H)、6.5～8.1(m，8H)、12.8～13.5(br，1H)

[ example 10 ]

Raney nickel (Ni content: 1g as 50% alloy) and 4.0g (14.5 mmol) of 2-nitro-2' -carboxy-phenylsulfide obtained by the method of example 1 were suspended in 50mL of n-butanol. The resulting n-butanol suspension was reacted with hydrogen under stirring at 100 ℃ for 15 hours. The resulting reaction suspension was filtered, and the filtrate was concentrated under reduced pressure to give 3.24g (13.2 mmol) of 2-amino-2' -carboxy-phenylsulfide as a colorless powder. (yield based on 2-nitro-2' -carboxy-phenylsulfide: 91%)

[ example 11 ]

2.75g (10.0 mmol) of 2-nitro-2' -carboxy-phenylsulfide obtained in example 1 was dissolved in 40mL of a concentrated aqueous ammonia solution (ammonia concentration: 28% by weight). To the obtained ammonia mixture, a solution of 21.6g (77.8 mmol) of ferrous sulfate 7 hydrate dissolved in 70mL of water was added dropwise, and the mixture was heated at 80 ℃ for 10 minutes to react. The resulting reaction solution was cooled to room temperature, filtered, and the filtrate was concentrated under reduced pressure to 30mL, and 70mL of ethyl acetate and 2mL of acetic acid were added. The separated organic layer was dried over anhydrous magnesium sulfate, the drying agent was removed by filtration, and the filtrate was concentrated under reduced pressure to give 2.33g (9.50 mmol) of 2-amino-2' -carboxy-phenylsulfide as a colorless powder. (yield based on 2-nitro-2' -carboxy-phenylsulfide: 95%)

[ example 12 ]

The same procedures as in example 10 were repeated except for using 15.2g (0.05 mol) of 2-nitro-2 '-carboxy-4' -methoxy-phenylsulfide obtained according to example 4 to give 12.7g (0.046 mol) of 2-amino-2 '-carboxy-4' -methoxy-phenylsulfide as a colorless powder. (yield based on 2-nitro-2 '-carboxy-4' -methoxy-phenylsulfide: 92%)

Melting point: 150-151 ℃ C

[ example 13 ]

A300 mL autoclave was charged with 1.37g of Pd (5 wt%)/C, 13.7g (0.05 mol) of 2-nitro-2' -carboxy-phenylsulfide obtained by the method of example 1, and 95mL of methanol, and after adjusting the hydrogen pressure to 10 atmospheres, the mixture was stirred at 25 ℃ for 6 hours to conduct hydrogenation. The reaction mixture was filtered, and the filtrate was concentrated under reduced pressure to give 11.7g (0.048 mol) of 2-amino-2' -carboxy-phenylsulfide as a colorless powder. (yield based on 2-nitro-2' -carboxy-phenylsulfide: 95%)

Melting point: 150-151 ℃ C

[ example 14 ]

The same procedures used in example 13 were repeated except that the reaction temperature was changed to 50 ℃ and the reaction time was changed to 4 hours, to give 12.0g (0.049 mol) of 2-amino-2' -carboxy-phenylsulfide. (yield based on 2-nitro-2' -carboxy-phenylsulfide: 98%)

[ example 15 ]

The same procedures used in example 14 were repeated except for changing 1.37g of Pd (5% by weight)/C to 2.91g of Pd (5% by weight)/C (water content: 52.9% by weight), to give 11.9g (0.049 mol) of 2-amino-2' -carboxy-phenylsulfide. (yield based on 2-nitro-2' -carboxy-phenylsulfide: 97%)

[ example 16 ]

The same procedures used in example 14 were repeated except that the amount of methanol used was changed to 50mL and the reaction time was changed to 6 hours, to give 11.9g (0.049 mol) of 2-amino-2' -carboxy-phenylsulfide. (yield based on 2-nitro-2' -carboxy-phenylsulfide: 97%)

[ example 17 ]

The same procedures used in example 14 were repeated except that the amount of methanol used was changed to 180mL and the reaction time was changed to 6 hours, to give 11.2g (0.046 mol) of 2-amino-2' -carboxy-phenylsulfide. (yield based on 2-nitro-2' -carboxy-phenylsulfide: 91%)

[ example 18 ]

The same procedures used in example 14 were repeated except for changing methanol to ethanol to give 11.2g (0.046 mol) of 2-amino-2' -carboxy-phenylsulfide. (yield based on 2-nitro-2' -carboxy-phenylsulfide: 92%)

[ example 19 ]

Except that 1.37g of Pd (5 wt%)/C was changed to 640mg of platinum oxide (PtO)₂) The same procedures as in example 14 were carried out, except for using 10.8g (0.044 mol) of 2-amino-2' -carboxy-phenylsulfide. (yield based on 2-nitro-2' -carboxy-phenylsulfide: 88%)

[ example 20 ]

The same procedures used in example 14 were repeated except for using 15.2g (0.05 mol) of 2-nitro-2 '-carboxy-4' -methoxy-phenylsulfide obtained according to example 4 to give 12.7g (0.046 mol) of 2-amino-2 '-carboxy-4' -methoxy-phenylsulfide. (yield based on 2-nitro-2 '-carboxy-4' -methoxy-phenylsulfide: 92%)

[ example 21 ]

24.5g (0.10 mol) of 2-amino-2' -carboxy-phenylsulfide obtained by the method of example 9 was dissolved in 300mL of toluene. The resulting toluene solution was refluxed for 20 hours to effect a reaction. The obtained reaction solution was cooled to room temperature, and then precipitated crystals were filtered. The obtained filtrate was dried to obtain dibenzo [ b, f ] [ ]1, 4 ] azothion15.7g (0.069 mol) of colorless needle-like crystals of the (E) -11-ketone. (yield based on 2-amino-2' -carboxy-phenylsulfide: 69%). Melting point: 259 to 260 DEG C

¹H-NMR(DMSO-d₆)：δ

7.05～7.80(m，8H)、10.7(s，1H)

[ example 22 ]

24.5g (0.10 mol) of 2-amino-2' -carboxy-phenylsulfide obtained by the method of example 9 was dissolved in 300mL of toluene. The obtained toluene solution was subjected to azeotropic dehydration for 20 hours (using a Dean-Stark apparatus) while refluxing to allow the reaction to proceed. The obtained reaction solution was cooled to room temperature, and then precipitated crystals were collected by filtration. Then, the obtained filtrate is dried to obtain dibenzo [ b, f ] -1, 4 ] thiazepine18.2g (0.080 mol) of colorless needle-like crystals of the (E) -11-ketone. (yield based on 2-amino-2' -carboxy-phenylsulfide: 80%).

[ example 23 ]

The same reaction as in example 22 was conducted, except that the reaction solvent was changed to xylene and the reaction time was changed to 15 hours, to obtain dibenzo [ b, f ] -1, 4 ] thiazepine22.3g (0.098 mol) of colorless needle-like crystals of the (E) -11-ketone. (yield based on 2-amino-2' -carboxy-phenylsulfide: 98%).

[ example 24 ]

The same reaction as in example 22 was conducted, except that the reaction solvent was changed to cumene and the reaction time was changed to 10 hours, to obtain diBenzo [ b, f ] [ 1, 4 ] thiazepine22.3g (0.098 mol) of colorless needle-like crystals of the (E) -11-ketone. (yield based on 2-amino-2' -carboxy-phenylsulfide: 98%).

[ example 25 ]

24.5g (0.10 mol) of 2-amino-2' -carboxy-phenylsulfide obtained by the method of example 14 was dissolved in 300mL of xylene. The xylene solution thus obtained was subjected to azeotropic dehydration for 15 hours (using a Dean-Stark apparatus) while refluxing to allow the reaction to proceed. After the resulting reaction solution was cooled to 75 ℃, 240mL of a saturated aqueous sodium bicarbonate solution was added thereto, and the mixture was stirred at 75 ℃ for 30 minutes. Subsequently, the precipitated crystals were collected by filtration. Drying the obtained filtrate to obtain dibenzo [ b, f ] -1, 4 ] thiazepine21.5g (0.095 mol) of colorless needle-like crystals of the (E) -11-ketone. (yield based on 2-amino-2' -carboxy-phenylsulfide: 95%).

[ example 26 ]

The same reaction as in example 25 was carried out, except that the saturated aqueous sodium bicarbonate solution was changed to a 1N aqueous sodium hydroxide solution and the amount thereof was changed to 200mL, to obtain dibenzo [ b, f ] [ 1, 4 ] thiazepine21.1g (0.093 mol) of colorless needle-like crystals of the (E) -11-ketone. (yield based on 2-amino-2' -carboxy-phenylsulfide: 93%).

[ example 27 ]

The same reaction as in example 25 was conducted, except that the reaction solvent was changed to cumene and the reaction time was changed to 10 hours, to obtain dibenzo [ b, f ] -1, 4 ] thiazepine22.0g (0.097 mol) of colorless needle-like crystals of the (E) -11-ketone. (yield based on 2-amino-2' -carboxy-phenylsulfide: 97%).

[ example 28 ]

The same reaction as in example 23 was carried out using 27.5g (0.10 mol) of 2-amino-2 '-carboxy-4' -methoxy-phenylsulfide obtained in example 12 to give 2-methoxy-dibenzo [ b, f ] [ 1, 4 ] thiazepine23.6g (0.092 mol) of colorless needle-like crystals of the (E) -11-ketone. (yield relative to 2-amino-4-methoxy-2' -carboxy-phenylsulfide: 92%). Melting point: 220-223 DEG C

Industrial applicability

Dibenzothiazepine according to the inventionThe process for producing dibenzothiazepine represented by the general formula (5) which is highly useful as an intermediate for pharmaceuticals can be produced in high yield by a simple operation by reacting a nitrobenzene derivative with a thiosalicylic acid derivative to produce a 2-nitro-2 '-carboxy-phenylene sulfide derivative, reducing the product to produce a 2-amino-2' -carboxy-phenylene sulfide derivative, and then subjecting the product to dehydration condensationAnd (3) derivatives.

Claims (4)

1. Dibenzothiazepine represented by the following general formula (5)A method for preparing a derivative of a compound having a structure,

in the formula, R¹、R²、R³、R⁴、R⁵、R⁶、R⁷And R⁸The same or different, represents a hydrogen atom, or a linear or branched alkyl group having 1 to 10 carbon atoms, an alkoxy group having 1 to 10 carbon atoms and having a linear or branched alkyl moiety having 1 to 10 carbon atoms, an alkylcarbonyl group having 2 to 11 carbon atoms and having a linear or branched alkyl moiety having 1 to 10 carbon atoms, a phenyl group, a naphthyl group, an anthracenyl group, an aryloxy group having a phenyl moiety, a naphthyl moiety or an anthracenyl moiety, or an arylcarbonyl group having a phenyl moiety, a naphthyl moiety or an anthracenyl moiety,

characterized in that a nitrobenzene derivative represented by the following general formula (1) and a thiosalicylic acid derivative represented by the following general formula (2) are reacted in a solvent selected from the group consisting of water, N-dimethylformamide, N-dimethylacetamide, N-methylpyrrolidone, dimethylimidazolidinone, an aliphatic alcohol organic solvent, a ketone organic solvent and a nitrile organic solvent in the presence of a base selected from the group consisting of potassium carbonate, sodium carbonate, lithium carbonate, sodium hydroxide, potassium hydroxide, lithium hydroxide and sodium methoxide to produce a 2-nitro-2 ' -carboxy-phenylene sulfide derivative represented by the following general formula (3), and then the 2-nitro-2 ' -carboxy-phenylene sulfide derivative is reduced to produce a 2-amino-2 ' -carboxy-phenylene sulfide derivative represented by the following general formula (4), dehydrating and condensing the 2-amino-2' -carboxy-phenylsulfide derivative;

in the formula, R¹、R²、R³And R⁴Represents the same meaning as above, and X represents a halogen atom;

in the formula, R⁵、R⁶、R⁷And R⁸Represents the same meaning as described above;

in the formula, R¹、R²、R³、R⁴、R⁵、R⁶、R⁷And R⁸Represents the same meaning as described above;

in the formula, R¹、R²、R³、R⁴、R⁵、R⁶、R⁷And R⁸The same meanings as described above are indicated.

2. The dibenzothiazepine of claim 1Process for the preparation of derivatives, characterized in that the base is selected from potassium carbonate, sodium hydroxide, potassium hydroxide and sodium methoxide.

3. The dibenzothiazepine of claim 1A process for producing a derivative, characterized by reducing a 2-nitro-2' -carboxy-phenylsulfide derivative represented by the general formula (3) in the presence of a substance selected from the group consisting of Raney nickel, ferrous salts, palladium, platinum, palladium compounds and platinum compounds.

4. The dibenzothiazepine of claim 1A process for the preparation of the derivatives, characterized in that 2-amino-2' -carboxy-benzene of the above general formula (4) is carried out in an organic solventDehydration condensation of thioether derivatives.