WO2010026882A1 - 脱臭化水素化抑制剤 - Google Patents
脱臭化水素化抑制剤 Download PDFInfo
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- WO2010026882A1 WO2010026882A1 PCT/JP2009/064643 JP2009064643W WO2010026882A1 WO 2010026882 A1 WO2010026882 A1 WO 2010026882A1 JP 2009064643 W JP2009064643 W JP 2009064643W WO 2010026882 A1 WO2010026882 A1 WO 2010026882A1
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- dehydrobromination
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D213/00—Heterocyclic compounds containing six-membered rings, not condensed with other rings, with one nitrogen atom as the only ring hetero atom and three or more double bonds between ring members or between ring members and non-ring members
- C07D213/02—Heterocyclic compounds containing six-membered rings, not condensed with other rings, with one nitrogen atom as the only ring hetero atom and three or more double bonds between ring members or between ring members and non-ring members having three double bonds between ring members or between ring members and non-ring members
- C07D213/04—Heterocyclic compounds containing six-membered rings, not condensed with other rings, with one nitrogen atom as the only ring hetero atom and three or more double bonds between ring members or between ring members and non-ring members having three double bonds between ring members or between ring members and non-ring members having no bond between the ring nitrogen atom and a non-ring member or having only hydrogen or carbon atoms directly attached to the ring nitrogen atom
- C07D213/24—Heterocyclic compounds containing six-membered rings, not condensed with other rings, with one nitrogen atom as the only ring hetero atom and three or more double bonds between ring members or between ring members and non-ring members having three double bonds between ring members or between ring members and non-ring members having no bond between the ring nitrogen atom and a non-ring member or having only hydrogen or carbon atoms directly attached to the ring nitrogen atom with substituted hydrocarbon radicals attached to ring carbon atoms
- C07D213/28—Radicals substituted by singly-bound oxygen or sulphur atoms
- C07D213/30—Oxygen atoms
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K31/00—Medicinal preparations containing organic active ingredients
- A61K31/33—Heterocyclic compounds
- A61K31/395—Heterocyclic compounds having nitrogen as a ring hetero atom, e.g. guanethidine or rifamycins
- A61K31/435—Heterocyclic compounds having nitrogen as a ring hetero atom, e.g. guanethidine or rifamycins having six-membered rings with one nitrogen as the only ring hetero atom
- A61K31/44—Non condensed pyridines; Hydrogenated derivatives thereof
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K31/00—Medicinal preparations containing organic active ingredients
- A61K31/33—Heterocyclic compounds
- A61K31/395—Heterocyclic compounds having nitrogen as a ring hetero atom, e.g. guanethidine or rifamycins
- A61K31/435—Heterocyclic compounds having nitrogen as a ring hetero atom, e.g. guanethidine or rifamycins having six-membered rings with one nitrogen as the only ring hetero atom
- A61K31/44—Non condensed pyridines; Hydrogenated derivatives thereof
- A61K31/4402—Non condensed pyridines; Hydrogenated derivatives thereof only substituted in position 2, e.g. pheniramine, bisacodyl
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
- A61P3/00—Drugs for disorders of the metabolism
- A61P3/08—Drugs for disorders of the metabolism for glucose homeostasis
- A61P3/10—Drugs for disorders of the metabolism for glucose homeostasis for hyperglycaemia, e.g. antidiabetics
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C49/00—Ketones; Ketenes; Dimeric ketenes; Ketonic chelates
- C07C49/04—Saturated compounds containing keto groups bound to acyclic carbon atoms
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C69/00—Esters of carboxylic acids; Esters of carbonic or haloformic acids
- C07C69/02—Esters of acyclic saturated monocarboxylic acids having the carboxyl group bound to an acyclic carbon atom or to hydrogen
- C07C69/12—Acetic acid esters
- C07C69/14—Acetic acid esters of monohydroxylic compounds
Definitions
- the present invention relates to a dehydrobromination inhibitor that suppresses the reaction of elimination of hydrogen bromide from methyl 2-bromo-3- ⁇ 4- [2- (5-ethyl-2-pyridyl) ethoxy] phenyl ⁇ propionate. , A mixture of the compound and the dehydrobromination inhibitor, and a method for storing the compound using the dehydrobromination inhibitor.
- Methyl 2-bromo-3- ⁇ 4- [2- (5-ethyl-2-pyridyl) ethoxy] phenyl ⁇ propionate has an excellent therapeutic effect on type 2 diabetes caused by insufficient action of insulin It is an important compound as an intermediate raw material for the production of the therapeutic agent 5- ⁇ 4- [2- (5-ethyl-2-pyridyl) ethoxy] benzyl ⁇ thiazolidine-2,4-dione hydrochloride.
- the methyl 2-bromo-3- ⁇ 4- [2- (5-ethyl-2-pyridyl) ethoxy] phenyl ⁇ propionate represented by the formula (hereinafter also referred to as the compound represented by the formula (1)) is represented by the formula ( It is a very important compound as an intermediate raw material of 5- ⁇ 4- [2- (5-ethyl-2-pyridyl) ethoxy] benzyl ⁇ thiazolidine-2,4-dione hydrochloride represented by 4).
- an object of the present invention is to suppress the dehydrobromination reaction of methyl 2-bromo-3- ⁇ 4- [2- (5-ethyl-2-pyridyl) ethoxy] phenyl ⁇ propionate represented by the formula (1) There is to do.
- the present inventors have conducted intensive research to solve the above problems.
- at least one compound selected from the group consisting of ester compounds and ketone compounds is converted into 2-bromo-3- ⁇ 4- [2- (5-ethyl-2-pyridyl) represented by the formula (1).
- 2-bromo-3- ⁇ 4- [2- (5-ethyl-2-pyridyl) represented by the formula (1) By coexisting with methyl ethoxy] phenyl ⁇ propionate, it was found that the dehydrobromination of the compound represented by the formula (1) can be suppressed, and the present invention has been completed.
- the first invention of the present invention comprises at least one compound selected from the group consisting of ester compounds and ketone compounds, represented by the following formula (1):
- the dehydrobromination inhibitor further improves the dehydrobromination effect by further containing an acid.
- the second present invention relates to methyl 2-bromo-3- ⁇ 4- [2- (5-ethyl-2-pyridyl) ethoxy] phenyl ⁇ propionate represented by the formula (1), an ester compound and a ketone compound.
- a compound represented by the formula (1) which can be stored for a long period of time by suppressing the dehydrobromination of the compound represented by the formula (1) by coexisting with at least one compound selected from the group consisting of This is a storage method.
- the dehydrobromination inhibition action is further improved by further coexisting an acid.
- At least one compound selected from the group consisting of an ester compound excluding ethyl acetate and an acrylate ester, and a ketone compound, and 2-bromo-3- ⁇ 4- A mixture of methyl [2- (5-ethyl-2-pyridyl) ethoxy] phenyl ⁇ propionate. This mixture suppresses dehydrobromination of the compound represented by the formula (1) and can be stored for a long time.
- the above mixture may be a mixture further containing an acid.
- the mixture is an ester compound, which will be described later, but excludes ethyl acetate used for extraction and acrylic acid ester used as a raw material.
- the present invention comprises methyl 2-bromo-3- ⁇ 4- [2- (5-ethyl-2-pyridyl) ethoxy] phenyl ⁇ propionate represented by the formula (1), an ester compound and a ketone compound.
- dehydrobromination of the compound represented by the formula (1) can be suppressed. Therefore, long-term storage of the compound represented by the formula (1) becomes possible.
- the yield of 5- ⁇ 4- [2- (5-ethyl-2-pyridyl) ethoxy] benzyl ⁇ thiazolidine-2,4-dione hydrochloride represented by the formula (4) can also be improved.
- the coexistence of an acid enables further long-term storage of the compound represented by the formula (1).
- the present invention has a very high industrial utility value.
- dehydrobromination refers to methyl 2-bromo-3- ⁇ 4- [2- (5-ethyl-2-pyridyl) ethoxy] phenyl ⁇ propionate represented by the above formula (1). It means that hydrogen bromide is eliminated and an enone form represented by the above formula (9) is obtained. Suppressing dehydrobromination refers to suppressing the production of an enone represented by the above formula (9).
- the dehydrobromination inhibitor of the present invention is effective for the compound of formula (1) having a purity of 100%.
- the present invention is not limited to this, and is also effective for a crude product containing 30% or more of the compound represented by the formula (1) obtained according to the method of the reaction formula (A).
- the purity of the compound represented by the formula (1) is preferably 30% to 100% as described above.
- the purity is more preferably 40% to 100% so that the effect of suppressing dehydrobromination can be exhibited.
- the purity of the compound represented by the formula (1) targeted by is preferably 40% to 85%, more preferably 45% to 80%.
- the purity of the compound shown by Formula (1) shows the value of the peak area% measured using the high performance liquid chromatography (HPLC).
- the main by-product generated when the compound represented by the formula (1) is produced is 4- [2- (5-ethyl-2-pyridyl) represented by the following formula (10). ) Ethoxy] bromobenzene.
- the first invention of the present invention is 2-bromo-3- ⁇ 4- [2- (5) represented by the formula (1), which comprises at least one compound selected from the group consisting of ester compounds and ketone compounds. -Ethyl-2-pyridyl) ethoxy] phenyl ⁇ dehydrobromide inhibitor of methyl propionate.
- At least one compound selected from the group consisting of an ester compound and a ketone compound may be simply referred to as a dehydrobromination inhibitor.
- ester compound As the ester compound used in the present invention, an ester compound of a reagent or an industrial raw material can be used without any limitation.
- the ester compound may be a product obtained as a reagent or an industrial raw material and further purified by an operation such as distillation.
- ester compound examples include formic acid esters having 1 to 5 carbon atoms, acetic acid esters having 2 to 9 carbon atoms, propionic acid esters having 3 to 7 carbon atoms, butyric acid esters having 4 to 8 carbon atoms, and benzoic acid having 7 to 13 carbon atoms.
- Esters and lactones having 5 to 6 carbon atoms are preferred.
- acetates having 2 to 9 carbon atoms are preferable.
- carbon number of the said ester compound is the number remove
- ester compound examples include methyl formate, ethyl formate, propyl formate, butyl formate, isobutyl formate, pentyl formate, methyl acetate, ethyl acetate, propyl acetate, isopropyl acetate, butyl acetate, isobutyl acetate, sec-butyl acetate.
- Pentyl acetate isopentyl acetate, 3-methoxybutyl acetate, sec-hexyl acetate, 2-ethylbutyl acetate, 2-ethylhexyl acetate, cyclohexyl acetate, benzyl acetate, methyl propionate, ethyl propionate, propyl propionate, butyl propionate, Pentyl propionate, isopentyl propionate, methyl butyrate, ethyl butyrate, butyl butyrate, isopentyl butyrate, methyl benzoate, ethyl benzoate, propyl benzoate, butyl benzoate, isopentyl benzoate, benzoic acid Jill, ⁇ - butyrolactone, such as ⁇ - caprolactone.
- methyl acetate, ethyl acetate, propyl acetate, isopropyl acetate, butyl acetate, and isobutyl acetate are particularly preferable because they are easy to handle and highly effective in suppressing dehydrobromination.
- ketone compound As a ketone compound used in the present invention, a reagent or an industrial raw material ketone compound can be used without any limitation.
- the ketone compound obtained as a reagent or an industrial raw material may be further purified by an operation such as distillation.
- the ketone compound is preferably an aliphatic ketone having 3 to 9 carbon atoms, an aliphatic cyclic ketone having 6 to 9 carbon atoms, an aromatic ketone, or the like.
- ketone compound examples include acetone, methyl ethyl ketone, 2-pentanone, 3-pentanone, 2-hexanone, methyl isobutyl ketone, 2-heptanone, 4-heptanone, diisobutyl ketone, acetonyl acetone, mesityl oxide, phorone, Examples include isophorone, cyclohexanone, methylcyclohexanone, and acetophenone.
- ketone compounds acetone, methyl ethyl ketone, methyl isobutyl ketone, cyclohexanone, and methylcyclohexanone are preferable because they are easy to handle and have a high dehydrobromination effect.
- ester compounds and ketone compounds can be used alone or in combination of two or more as required.
- the amount of the dehydrobromination inhibitor of the present invention is not particularly limited, but the compound 2-bromo-3- ⁇ 4- [2- (5-ethyl-2-) represented by the formula (1) is not limited. Preferably, the amount is such that methyl pyridyl) ethoxy] phenyl ⁇ propionate can be completely dissolved.
- the amount of the dehydrobromination inhibitor used is ( The amount is preferably 0.1 to 200 parts by weight, more preferably 3 to 100 parts by weight, and particularly preferably 5 to 50 parts by weight with respect to 100 parts by weight of the compound 1).
- the said dehydrobromination inhibitor can mix
- limiting in particular in a compounding quantity In order to suppress dehydrobromination more reliably, 100 mass parts or less are preferable with respect to 100 mass parts of ester compounds or ketone compounds, and 10 mass parts or less are more preferable.
- the dehydrobromination inhibitor can further contain an acid.
- the dehydrobromide inhibitor further contains an acid, whereby the compound 2-bromo-3- ⁇ 4- [2- (5-ethyl-2-pyridyl) ethoxy] phenyl ⁇ propion represented by the formula (1)
- the effect of suppressing the dehydrobromination of methyl acid becomes higher.
- a reagent or an industrial raw material can be used without any limitation.
- the acid obtained as a reagent or industrial raw material may be further purified by an operation such as distillation.
- acids include mineral acids, organic acids, and heteropoly acids. Specific examples include mineral acids such as hydrochloric acid, nitric acid, nitrous acid, sulfuric acid, sulfurous acid, and hydrobromic acid, and carboxylic acids such as formic acid, acetic acid, propionic acid, butyric acid, stearic acid, and benzoic acid.
- mineral acids such as hydrochloric acid, nitric acid, nitrous acid, sulfuric acid, sulfurous acid, and hydrobromic acid
- carboxylic acids such as formic acid, acetic acid, propionic acid, butyric acid, stearic acid, and benzoic acid.
- carboxylic acids having 1 to 3 carbon atoms such as formic acid, acetic acid, propionic acid, hydrochloric acid, nitric acid, sulfuric acid, or hydrobromic acid are preferable in view of ease of handling.
- the amount of the acid used is not particularly limited, but it is represented by the formula (1) in consideration of the dehydrobromination effect of the compound represented by the formula (1), the suppression efficiency with respect to the amount used, and the like.
- the amount is preferably 0.01 to 2 mol, more preferably 0.05 to 1 mol, particularly preferably 0.05 to 0.5 mol, relative to 1 mol of the compound. That is, the amount of the acid used is preferably from 1 to 200 mol%, more preferably from 5 to 100 mol%, particularly preferably from 5 to 50 mol%, based on the compound represented by the formula (1).
- the second aspect of the present invention relates to methyl 2-bromo-3- ⁇ 4- [2- (5-ethyl-2-pyridyl) ethoxy] phenyl ⁇ propionate represented by the formula (1), an ester compound and a ketone compound.
- This is a method for preserving a compound represented by the formula (1) in which at least one compound selected from the group (dehydrobromination inhibitor) coexists.
- the dehydrobromination of the compound represented by formula (1) is suppressed, This is a method for stably storing the compound represented by 1) for a long period of time. In the above storage method, the effect of suppressing dehydrobromination can be enhanced by further coexisting an acid as necessary.
- the term “storage” refers to the synthesis of the compound represented by the formula (1) and then leaving it for a relatively long time for the purpose of use in the next step. Therefore, when the compound represented by the formula (1) obtained by synthesis is immediately treated by an operation such as extraction, or when it is used for the reaction in the next step within a relatively short time, it is used in the present invention. Not included in neglect. That is, in the present invention, the term “leaving” refers to the case of storing for 3 to 180 days.
- the compound represented by the formula (1) varies depending on the standing conditions, but is considered to be gradually dehydrobrominated when left standing. Therefore, even when left for a short time, when the dehydrobromination inhibitor of the present invention and the compound represented by the formula (1) are allowed to coexist, the inhibitory effect is exhibited. However, when the standing period is short, the dehydrobromination amount of the compound represented by the formula (1) itself is small, so that the suppression effect is not noticeable. However, when left standing for 72 hours or longer (3 days or longer), the amount of dehydrobromination increases in proportion to the standing time, so that the suppression effect of the present dehydrobromide inhibitor can be recognized remarkably.
- the upper limit of the storage days is not particularly limited, but is usually 180 days.
- a mixture of the compound represented by the formula (1) and at least one compound (dehydrobromination inhibitor) selected from the group consisting of an ester compound and a ketone compound is put in a sealed container,
- a method in which an inert gas such as nitrogen is filled in a sealed container and stored in a cool and dark place is preferable.
- the storage temperature is usually preferably 30 ° C. or lower, and more preferably 10 ° C. or lower.
- the lower limit of the temperature during storage is not particularly limited, and is appropriately determined according to the type of dehydrobromination inhibitor to be used. When considering production on an industrial scale, the lower limit of the temperature during storage is ⁇ 30 ° C.
- the mixture thus stored can be used as it is in the next step.
- it may be used after being removed in advance by an operation such as distillation.
- an acid it can be used in the next step after the acid is removed by neutralization.
- the third present invention relates to a compound 2-bromo-3- ⁇ 4- [2- (5-ethyl-2-pyridyl) ethoxy] phenyl ⁇ propionate represented by the formula (1), an ester compound and a ketone compound It is a mixture formed by coexisting with at least one compound selected from the group consisting of: In order for these compounds to coexist, the compound represented by the formula (1) and at least one compound selected from the group consisting of an ester compound and a ketone compound (dehydrobromination inhibitor) are mixed, What is necessary is just to make it into a mixture. By using a mixture, dehydrobromination of the compound represented by formula (1) can be suppressed.
- a normal mixing method is employed without any limitation.
- a uniform mixture is obtained by a method such as stirring and mixing.
- both may be added to the mixing container at the same time, or may be added to the mixing container and mixed sequentially.
- the concentration of the desired dehydrobromination inhibitor is removed by a method such as distilling off the added dehydrobromination inhibitor. You may adjust it.
- Extract liquid for isolating the compound represented by the formula (1) from the reaction mixture obtained in the synthesis of the compound represented by the formula (1) by selecting the type of dehydrobromination inhibitor to be used The dehydrobromination inhibitor can also be used.
- the extract can be made into a mixture of a dehydrobromination inhibitor having a desired concentration by washing with water or distilling off the extract. After these operations, the mixture is stored.
- the temperature at the time of mixing the dehydrobromination inhibitor and the compound represented by the formula (1) is usually preferably 50 ° C. or less, and more preferably 40 ° C. or less. If the mixing temperature is excessively high, the compound represented by formula (1) may be decomposed.
- the lower limit of the temperature during mixing is not particularly limited as long as the mixture does not solidify. The lower limit of the temperature at the time of mixing is appropriately determined according to the dehydrobromination inhibitor used and the like, but is ⁇ 5 ° C. in consideration of industrial scale production.
- various organic solvents can be blended with the above mixture within a range that does not impair the effects of the present invention.
- limiting in particular in a compounding quantity In order to suppress dehydrobromination more reliably, 100 mass parts or less are preferable with respect to 100 mass parts of ester compounds or ketone compounds, and 10 mass parts or less are more preferable.
- an acid may further coexist. That is, a mixture containing the compound represented by the formula (1), the dehydrobromination inhibitor (at least one compound selected from the group consisting of an ester compound and a ketone compound), and an acid is also a preferable mixture of the present invention. .
- the acid described in the first invention can be used as the acid.
- the method for coexisting acid is not particularly limited.
- An acid can coexist by a normal mixing method. In this case, it is preferable to mix so that the mixture containing an acid may become uniform, for example using a stirring apparatus etc. similarly to said method.
- the order of mixing the three components consisting of the compound represented by the formula (1), the dehydrobromination inhibitor, and the acid is not particularly limited. Specifically, all three components may be introduced into the container at the same time and mixed. Alternatively, the three components may be sequentially introduced into the container and mixed in any order. Furthermore, arbitrary two components may be mixed in advance and then mixed with the remaining components.
- a mixture of the compound represented by formula (1) and a dehydrobromination inhibitor, and an acid are preferably mixed.
- the temperature when mixing these three components is the compound represented by the above formula (1)
- the same temperature as when mixing with the dehydrobromination inhibitor is preferred. That is, when the mixing temperature is excessively high, the compound represented by the formula (1) may be decomposed. Therefore, the mixing temperature is usually preferably 50 ° C. or lower, and more preferably 40 ° C. or lower.
- the lower limit value of the temperature during mixing is not particularly limited. It is determined appropriately depending on the acid to be used and the type of dehydrobromination inhibitor. Specifically, the lower limit of the temperature at the time of mixing is preferably a temperature at which the mixture does not become solid, and is ⁇ 5 ° C. in consideration of production on an industrial scale.
- the dehydrobromination inhibitor and additive compound used in Examples and Comparative Examples were those having a water content of 50000 ppm or less.
- the bromobenzene content is a value of peak area% measured by HPLC.
- Example 1 The crude 17.6 g (purity 56.8%) of the compound of formula (1) produced in the above production example was placed in a 100 ml eggplant flask immediately after production. Next, 2.5 g of acetone (25 parts by mass of acetone with respect to 100 parts by mass of the compound of the formula (1)) was added at 30 ° C. and stirred to obtain a uniform mixture. Immediately, the homogeneous mixture was placed in a light-tight sealed container, sealed with nitrogen, and stored at 5 ° C. After 3 days, the mixture was analyzed by high performance liquid chromatography (HPLC). Using the peak area% of the chromatogram to calculate the dehydrobromination rate (enon body formation ratio), it was 0.06%.
- HPLC high performance liquid chromatography
- the dehydrobromination rate was defined as the percentage increase in the peak area% of the enone body after storage with respect to the initial value (at the start of storage) of the peak area% of the enone body represented by the above formula (9).
- Example 2 (Examples 2 to 9) The compounds shown in Table 1 were added, the same operation as in Example 1 was performed, and the dehydrobromination rate was measured. The results are shown in Table 1.
- Example 10 to 15 The same operation as in Example 1 was carried out except that the use amount of ethyl acetate shown in Table 2 was used as the additive compound (dehydrobromination inhibitor). The dehydrobromination rate after storage at 5 ° C. for 30 days was measured. The results are shown in Table 2.
- Example 16 to 19 The same operation as in Example 1 except that the compound of the formula (1) having a purity of 98.5% produced in the above production example was used and the compound shown in Table 3 was used as a dehydrobromination inhibitor. Went. The obtained results are shown in Table 3.
- Comparative Examples 10-13 The same operation as in Example 1 was performed except that the compound represented by the formula (1) having a purity of 98.5% produced in the above Production Example was used and the compound shown in Table 5 was used as the additive compound. The obtained results are shown in Table 5.
- Example 20 In a 100 mL eggplant flask, 17.6 g (purity 56.8%, 10.0 g, 25.0 mmol as a compound of formula (1)) of the compound represented by formula (1) produced in the above production example was placed. Then, 2.50 g of ethyl acetate (25 parts by mass of ethyl acetate with respect to 100 parts by mass of the compound of formula (1)) and 0.150 g of acetic acid (2.5 mmol, 10 mol of acetic acid with respect to the compound of formula (1)) %) At 30 ° C. and stirred to homogenize. Immediately, this mixture was put in a light-tight sealed container, and nitrogen was sealed in the container and stored.
- Example 6 After cooling to 5 ° C., the dehydrobromination rate was measured by HPLC after 3 days. The dehydrobromination rate was 0.00%. Moreover, the same operation was performed and stored at 5 ° C. for 30 days had a dehydrobromination rate of 0.7%. The results are summarized in Table 6. (Examples 21 to 28) Using the acid and solvent (dehydrobromination inhibitor) shown in Table 6, the same operation as in Example 20 was performed, and the dehydrobromination rate was measured. The obtained results are shown in Table 6. However, 10 mass% aqueous solution was used for hydrochloric acid, sulfuric acid, and hydrobromic acid. The amount used represents hydrogen chloride, sulfuric acid (H 2 SO 4 ), and mol% of hydrobromic acid.
- Example 29 to 32 The same operation as in Example 20 was carried out except that ethyl acetate was used as a dehydrobromination inhibitor and the amount of acetic acid shown in Table 7 was used. The dehydrobromination rate of the mixture when stored at 5 ° C. for 30 days was measured. The results obtained are shown in Table 7.
- Examples 33 to 36 The same as in Example 20 except that the acid shown in Table 8 and the dehydrobromination inhibitor were used and the compound represented by the formula (1) having a purity of 98.5% produced in the above Production Example was used. The operation was carried out and the dehydrobromination rate was measured. The results are shown in Table 8. However, 10 mass% aqueous solution was used for hydrochloric acid. The amount used represents mol% of hydrogen chloride.
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Abstract
Description
本発明において使用される式(1)で示される化合物は、例えば、前記特許文献1の方法を用いて製造することができる。
本発明の第一の発明は、エステル化合物、およびケトン化合物よりなる群から選ばれる少なくとも1種の化合物よりなる、式(1)で示される2-ブロモ-3-{4-[2-(5-エチル-2-ピリジル)エトキシ]フェニル}プロピオン酸メチルの脱臭化水素化抑制剤である。
本発明において使用するエステル化合物は、試薬或いは工業原料のエステル化合物が何ら制限なく使用できる。エステル化合物は、試薬または工業原料として入手したものを、蒸留等の操作によって更に精製したものであっても良い。
本発明において使用するケトン化合物としては、試薬或いは工業原料のケトン化合物が何ら制限なく使用できる。ケトン化合物は、試薬または工業原料として入手したものを、蒸留等の操作によって更に精製したものであっても良い。
上記脱臭化水素化抑制剤は、さらに、酸を含むこともできる。
第二の本発明(保存方法)
第二の本発明は、式(1)で示される2-ブロモ-3-{4-[2-(5-エチル-2-ピリジル)エトキシ]フェニル}プロピオン酸メチルと、エステル化合物およびケトン化合物よりなる群から選ばれる少なくとも1種の化合物(脱臭化水素化抑制剤)とを共存させる式(1)で示される化合物の保存方法である。式(1)で示される化合物と、上記脱臭化水素化抑制剤とを共存させること(混合物とすること)により、式(1)で示される化合物の脱臭化水素化を抑制して、式(1)で示される化合物を長期間、安定に保存する方法である。上記保存方法においては、必要に応じて、さらに酸を共存させることにより、脱臭化水素化の抑制効果を高めることができる。
第三の本発明(混合物)
第三の本発明は、式(1)で示される化合物2-ブロモ-3-{4-[2-(5-エチル-2-ピリジル)エトキシ]フェニル}プロピオン酸メチルと、エステル化合物およびケトン化合物よりなる群から選ばれる少なくとも1種の化合物とが共存してなる混合物である。これらの化合物を共存させるためには、式(1)で示される化合物と、エステル化合物およびケトン化合物よりなる群から選ばれる少なくとも1種の化合物(脱臭化水素化抑制剤)とを混合して、混合物にしてやればよい。混合物にすることにより、式(1)で示される化合物の脱臭化水素化を抑制することができる。
(2-ブロモ-3-{4-[2-(5-エチル-2-ピリジル)エトキシ]フェニル}プロピオン酸メチルの製造方法)
式(8)で示される4-[2-(5-エチル-2-ピリジル)エトキシ]アニリン1210g(5mol)を50Lの反応釜に仕込み、メタノール4.5L、アセトン11.5Lを加え、氷冷した。次いで、上記4-[2-(5-エチル-2-ピリジル)エトキシ]アニリンを含む溶液を撹拌しながら、47%臭化水素酸2.67kg(臭化水素 15.5mol)を添加し、2℃に冷却した。さらに、撹拌中の上記臭化水素酸を加えた溶液に、680mlの水に亜硝酸ナトリウム400g(5.7mol)を溶解させた溶液を、溶液の温度が5℃を超えないように保ちながら、滴下した。
上記製造例で製造した式(1)の化合物の粗体17.6g(純度56.8%)を、製造した直後に100mlのナスフラスコに入れた。次いで、アセトン2.5g(式(1)の化合物100質量部に対してアセトン25質量部)を30℃に保ちながら添加し、攪拌することにより、均一な混合物を得た。直ちに、前記均一な混合物を遮光密閉容器に入れ、窒素を封入した後、5℃で保存した。3日後、混合物を高性能液体クロマトグラフィー(HPLC)で分析した。クロマトグラムのピーク面積%を用いて脱臭化水素化率(エノン体の生成割合)を算出したところ、0.06%であった。
表1に示した化合物を添加し、実施例1と同様の操作を行い、脱臭化水素化率を測定した。その結果を表1に示した。
添加化合物(脱臭化水素化抑制剤)として、表2に示した使用量の酢酸エチルを使用した以外は実施例1と同様の操作を行った。5℃で、30日間保存後の脱臭化水素化率を測定した。その結果を表2に示した。
前記製造例で製造した純度98.5%の式(1)で示される化合物を使用し、脱臭化水素化抑制剤として表3に示した化合物を使用した以外は、実施例1と同様の操作を行った。得られた結果を表3に示した。
表4に示した化合物を添加し、実施例1と同様の操作を行い、脱臭化水素化率を測定した。その結果を表4に示した。
前記製造例で製造した純度98.5%の式(1)で示される化合物を使用し、添加化合物として表5に示した化合物を使用した以外は、実施例1と同様の操作を行った。得られた結果を表5に示した。
100mLのナスフラスコに、上記製造例で製造した式(1)で示される化合物の粗体17.6g(純度56.8%、式(1)の化合物として10.0g、25.0mmol)を入れ、次いで、酢酸エチル2.50g(式(1)の化合物100質量部に対して酢酸エチル25質量部)、及び酢酸0.150g(2.5mmol、式(1)の化合物に対して酢酸10モル%)を30℃で添加し、撹拌して均一にした。直ちに、この混合物を遮光密閉容器に入れ、容器内に窒素を封入して保存した。5℃に冷却して、3日後、HPLCにより、脱臭化水素化率を測定した。脱臭化水素化率は0.00%であった。また、同じ操作を行い、5℃で、30日間保存したものは、脱臭化水素化率が0.7%であった。結果を表6にまとめた
(実施例21~28)
表6に示した酸及び溶媒(脱臭化水素化抑制剤)を使用し、実施例20と同様の操作を行い、脱臭化水素化率を測定した。得られた結果を表6に示した。ただし、塩酸、硫酸、および臭化水素酸は、10質量%の水溶液を使用した。使用量は、塩化水素、硫酸(H2SO4)、臭化水素の酸のモル%を示す。
脱臭化水素化抑制剤として酢酸エチルを使用し、表7に示した使用量の酢酸を用いた以外は実施例20と同様の操作を行った。5℃で、30日間保存した際の混合物の脱臭化水素化率を測定した。得られた結果を表7に示した。
表8に示した酸、及び脱臭化水素化抑制剤を使用し、上記製造例で製造した純度98.5%の式(1)で示される化合物を使用した以外は、実施例20と同様の操作を行い、脱臭化水素化率を測定した。その結果を表8に示した。ただし、塩酸は、10質量%の水溶液を使用した。使用量は、塩化水素のモル%を示す。
Claims (6)
- 2-ブロモ-3-{4-[2-(5-エチル-2-ピリジル)エトキシ]フェニル}プロピオン酸メチルと、エステル化合物およびケトン化合物よりなる群から選ばれる少なくとも1種の化合物とを共存させることにより、2-ブロモ-3-{4-[2-(5-エチル-2-ピリジル)エトキシ]フェニル}プロピオン酸メチルの脱臭化水素化を抑制して保存することを特徴とする2-ブロモ-3-{4-[2-(5-エチル-2-ピリジル)エトキシ]フェニル}プロピオン酸メチルの保存方法。
- 酢酸エチルとアクリル酸エステルを除くエステル化合物およびケトン化合物よりなる群から選ばれる少なくとも1種の化合物と、
2-ブロモ-3-{4-[2-(5-エチル-2-ピリジル)エトキシ]フェニル}プロピオン酸メチルと、
を含む混合物。 - さらに、酸を含む請求項1に記載の脱臭化水素化抑制剤。
- さらに、酸を共存させることを特徴とする請求項2に記載の保存方法。
- さらに、酸を含む請求項3に記載の混合物。
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| JP2010527751A JP5553759B2 (ja) | 2008-09-02 | 2009-08-21 | 脱臭化水素化抑制剤 |
| CN2009801294692A CN102112444A (zh) | 2008-09-02 | 2009-08-21 | 脱溴化氢化抑制剂 |
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| JP (1) | JP5553759B2 (ja) |
| KR (1) | KR20110049779A (ja) |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6357556A (ja) * | 1986-08-27 | 1988-03-12 | Daicel Chem Ind Ltd | ハロカルボン酸エステルの安定化方法 |
| JPH0566956B2 (ja) * | 1985-01-19 | 1993-09-22 | Takeda Chemical Industries Ltd | |
| JPH0641343A (ja) * | 1992-07-08 | 1994-02-15 | Central Glass Co Ltd | 1,1−ジクロロ−1 −フルオロエタンの安定化方法 |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2006117654A1 (en) * | 2005-05-03 | 2006-11-09 | Ranbaxy Laboratories Limited | Processes for the preparation of pioglitazone or salts thereof |
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2009
- 2009-08-21 WO PCT/JP2009/064643 patent/WO2010026882A1/ja not_active Ceased
- 2009-08-21 CN CN2009801294692A patent/CN102112444A/zh active Pending
- 2009-08-21 JP JP2010527751A patent/JP5553759B2/ja not_active Expired - Fee Related
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0566956B2 (ja) * | 1985-01-19 | 1993-09-22 | Takeda Chemical Industries Ltd | |
| JPS6357556A (ja) * | 1986-08-27 | 1988-03-12 | Daicel Chem Ind Ltd | ハロカルボン酸エステルの安定化方法 |
| JPH0641343A (ja) * | 1992-07-08 | 1994-02-15 | Central Glass Co Ltd | 1,1−ジクロロ−1 −フルオロエタンの安定化方法 |
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| KR20110049779A (ko) | 2011-05-12 |
| JPWO2010026882A1 (ja) | 2012-02-02 |
| JP5553759B2 (ja) | 2014-07-16 |
| CN102112444A (zh) | 2011-06-29 |
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