JPH0692945A - Production of cyclic urethane compound - Google Patents

Abstract

PURPOSE:To provide the method for producing a cyclic urethane compound by reacting an aminoalcohol with carbon dioxide. CONSTITUTION:An aminoalcohol is reacted with carbon dioxide in the presence of a tertiary amine, a trivalent organic phosphorus compound and an organic halide compound to produce the cyclic urethane compound. The method can provide the cyclic urethane compound at the ordinary temperature under the ordinary pressure in a high yield. Further, the chemical fixation of the carbon dioxide and the treatment of the organic halide compound can simultaneously be performed.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a method for producing a cyclic urethane compound.

[0002]

2. Description of the Related Art Cyclic urethane compounds, for example, 2-oxazolidone derivatives, are used as raw materials for synthesizing drugs such as anticonvulsants and as intermediates for synthesizing highly functional liquid crystal materials. 2-
As a method for producing oxazolidone, a method of reacting 2-bromoethylamine hydrobromide with sodium carbonate or silver carbonate, a method of reacting ethanolamine hydrochloride with potassium cyanide, N- (2-hydroxyethyl) urea or A method of heating N- (2-hydroxyethyl) carbamic acid ester has been proposed. Moreover, as a method for producing a 2-oxazolidone derivative, a method of reacting an ethanolamine derivative with diethyl carbonate, ethyl chloroformate, ethyl trichloroacetate, phosgene, or urea, N-in the presence of triethylamine,
Ethyl (4-methoxyphenyl) carbamate and 1,2
-A method of reacting an epoxy alkane is known.

By the way, in recent years, tropical forests have been degraded to agriculture and pastures, and forests have been degraded due to deforestation of trees. Due to the synergistic effect of such forest degradation and the rapid increase in energy consumption, the rate of increase in the concentration of carbon dioxide (carbon dioxide) in the atmosphere is increasing year by year, and the global warming caused by the greenhouse effect of carbon dioxide is affecting the global environment. It is threatened to have serious effects. Therefore, a method for producing a 2-oxazolidone derivative has been proposed from the viewpoint of effective utilization of carbon dioxide gas. For example,
A method of reacting an ethanolamine derivative with carbon dioxide in the presence of a dehydrating agent such as tetraalkylpyrophosphate (Japanese Patent Laid-Open No. 53-111062), or reacting an aziridine derivative or 3-aminopropene with carbon dioxide in the presence of iodine. Method (JCS Chemical Communicatio
n, 1976, 617), a method of reacting propargylamine with carbon dioxide in the presence of a copper catalyst (German Patent 1,164,
No. 411), a ruthenium complex or a zinc complex is used as a photosensitizer, and ethanolamine and carbon dioxide gas are reacted using a thiol oxidation reaction and a dehydration condensation reaction driven by a redox reaction of thiol and phosphine. Method (Japanese Patent Application Laid-Open No. 3-99070), an ethanolamine derivative by utilizing a condensation reaction using oxidation of an aromatic thiol catalyzed by a tetranuclear iron-sulfur complex and oxidation-reduction reaction of disulfide and triphenylphosphine as a driving force. A method of reacting carbon dioxide gas (Japanese Patent Application No. Hei 2-231281) and the like can be mentioned.

As represented by chlorofluorocarbons (chlorofluorocarbons), organic halogen compounds are generally chemically stable compounds, and due to their excellent properties, they are widely used in various applications such as detergents, refrigerants and spray bases. Has been done. However, the organic halogen compounds released to the environment cause global environmental problems other than global warming along with pollution of the hydrosphere. That is the destruction of the ozone layer. Therefore, in order to preserve the ozone layer, there is an international debate on the regulation of the production of organohalogen compounds that may cause ozone layer depletion. On the other hand, the treatment of the existing or used organohalogen compound has been conventionally performed by the combustion method. However, secondary pollution due to harmful substances such as dioxins generated during combustion treatment has become a major environmental problem. Therefore, it is necessary to urgently develop a new processing technique for such an organic halogen compound.

[0005]

The problem to be solved by the present invention is to carry out the treatment of an organic halogen compound when the carbon dioxide gas is immobilized by a chemical method to produce a useful substance.

[0006]

The method for producing a cyclic urethane compound according to the present invention for solving the above-mentioned problems is achieved by amino alcohol and carbon dioxide gas in the presence of a tertiary amine, a trivalent organic phosphorus compound and an organic halogen compound. Is characterized in that The tertiary amine in the present invention has a function of capturing hydrogen halide by-produced by the reaction of the following organic phosphorus compound, organic halogen compound and amino alcohol in the process of forming a cyclic urethane compound. Therefore, examples of the tertiary amine having such an effect include triethylamine, tripropylamine, tributylamine, pyridine, quinoline, picoline, lutidine, 1,4-diazabicyclo [2.2.2] octane and the like.

The trivalent organic phosphorus compound used in the present invention is represented by the general formula R ₃ P (R is an alkyl group, an aryl group, an aryloxy group or an alkoxy group).
Then, specifically, tributylphosphine, triphenylphosphine, triphenylphosphite, triethylphosphite, tripropylphosphite and the like can be exemplified. As an organic halogen compound, carbon tetrachloride is preferable, but an active compound formed by the reaction of a trivalent organic phosphorus compound and carbon tetrachloride [Chemische Berichit
e, 108 , 606 (1975)] with a trivalent organic phosphorus compound to form a compound similar to carbon tetrabromide, hexachloroethane, 1,1,1-trichloroethane, or an organic halogen such as trichlorofluoromethane. Compounds can also be used. As the amino alcohol in the present invention, β-amino alcohol represented by the following general formula (I) and γ-amino alcohol represented by the following general formula (II) are used.

[0008]

[Chemical 1]

In the formula (I), R ^{1 to} R ⁵ are hydrogen atoms, alkyl groups or aryl groups, and in the formula (II), R ^{6 to} R ¹² are hydrogen atoms, alkyl groups or aryl groups. R ² and R ⁴ in the formula (I), (II)
R ⁷ and R ⁹ , R ⁹ and R ¹¹ , or R ⁷ and R ^{11 in the} formula
Can together form an alkylene group.
The cyclic urethane compound forming reaction from the amino alcohol of the above formula (I) or (II) and carbon dioxide according to the present invention is represented by the following reaction formula (A) or (B), and is represented by the general formula (III) A cyclic urethane compound represented by
Oxazolidone derivative,

[0010]

[Chemical 2]

Alternatively, a cyclic urethane compound represented by the general formula (IV), that is, a 1-oxa-3-azacyclohexane-2-one derivative is obtained. R ^{1 to} R ⁵ and R ^{6 to} R ¹² in the general formulas (III) and (IV) are the same as those in the general formulas (I) and (II). In carrying out the present invention, it is preferable to use a solvent in order to increase the yield of the cyclic urethane compound. Acetonitrile is suitable as the solvent, but an aprotic organic polar solvent such as tetrahydrofuran, dimethylformamide, dimethylsulfoxide, or a mixture of two or more kinds of these organic polar solvents may be used.

The above-mentioned tertiary amine used in the present invention,
The preferred quantitative relationship between the trivalent organic phosphorus compound, the organic halogen compound and the amino alcohol is 1 mol of the tertiary amine, the trivalent organic phosphorus compound and the organic halogen compound per mol of the amino alcohol, respectively. Even if the amount of one component, two components, or all three components of the amine, the trivalent organic phosphorus compound and the organic halogen compound is varied within the range of 0.5 to 2 mol per mol of the amino alcohol, the cyclic urethane compound can be obtained. Obtainable. When the amount of the solvent is larger than the minimum amount capable of forming a uniform solution state of the mixture of these four components, the yield of the cyclic urethane compound is improved due to the dilution effect.

The corresponding cyclic urethane compound can be formed by stirring or stiring a solution of a mixture of amino alcohol, a trivalent organic phosphorus compound, a tertiary amine, and an organic halogen compound under a carbon dioxide gas atmosphere. it can. The reaction of forming the cyclic urethane compound proceeds smoothly at normal temperature (15 to 28 ° C) in a carbon dioxide gas atmosphere at atmospheric pressure, so heating (or cooling) operation and pressurizing operation are not particularly required. While heating (or cooling) in a carbon dioxide atmosphere, at room temperature in a pressurized carbon dioxide atmosphere, or while heating (or cooling) in a pressurized carbon dioxide atmosphere, the cyclic urethane compound formation reaction is performed. May be done.

According to the present invention, a mixture of a cyclic urethane compound, a hydrohalic acid salt of a tertiary amine, an oxidation product of a trivalent organic phosphorus compound and the like can be obtained. However,
The target cyclic urethane compound can be obtained in high purity from this mixture by using known separation means such as distillation method, fractional crystallization method and chromatography. Examples of the present invention will be described below.

[0015]

【Example】

Example 1 0.2 mmol of 2-phenylglycinol, triphenylphosphine, and triethylamine were added to a side-armed flask having an internal volume of 10 ml. After adding 5 ml of acetonitrile as a solvent, attach a balloon for gas storage to the flask,
Carbon dioxide was filled in the reaction system. 0.2 mmol of carbon tetrachloride was injected into the flask while stirring the contents of the flask. Using this time as the starting point of the reaction, the relationship between the conversion rate of 2-phenylglycinol to 4-phenyl-2-oxazolidone and the reaction time was analyzed by high performance liquid chromatography (HPL).
C) method (25 cm ODS column, acetonitrile: water = 70:
The following results were obtained when traced at 30 and a detection wavelength of 250 nm). Conversion rate (%) 43.6 65.5 85.3 90.0 91.7 Reaction time (hours) 2 4 6 20 24

Example 2 A thin layer chromatograph (TL) using silica gel as an adsorbent was used for the whole reaction mixture obtained by the reaction in Example 1 for 24 hours.
Each component was fractionated by method C). Ethyl acetate: hexane = 1: 2 was used as a developing solvent. Fractions corresponding to 4-phenyl-2-oxazolidone on the thin layer chromatogram were scraped and extracted with a 10% ethanol-chloroform solution overnight. By removing the extraction solvent, 4-phenyl-2-oxazolidone was obtained with a recovery rate of 55%. The product was purified by a recrystallization method with a benzene-hexane mixed solvent and had the following properties. Melting point 131.8-132.
6 ° C. Infrared spectrum (cm- ¹ ) 3262 (NH), 1751 (C = O)
. NMR spectrum (ppm) 4.19 (t, 1H, J = 7.6Hz, -CH
-Ph)); 4.74 (t, 1H, J = 8.6Hz, -CH _B -O); 4.96 (t,
1H, J = 7.8Hz, -CH _A -O); 5.73 (br s, 1H, NH); 7.45-
7.26 (m, 5H, Ph).

Example 3 1-Phenyl-2-aminoethanol, triphenylphosphine, triethylamine and carbon tetrachloride were used in an amount of 0.6 mmol and 5 ml of acetonitrile, respectively. 5 at 67% conversion
-Phenyl-2-oxazolidone was produced. The properties of the target substance fractionated and purified from the reaction product by the same method as in Example 2 were as follows. Melting point 90.3-91.8 ° C [literature value
88-90 ℃ (J. American Chemical Society, Vol. 73, 95
(1951))]. Infrared spectrum (cm ^-1 ) 3288 (NH), 175
1 (C = O). NMR spectrum (ppm) 3.55 (t, 1H, J = 8.2
Hz, -CH _B -N); 3.99 (t, 1H, J = 8.6Hz, -CH _A -N); 5.63
(t, 1H, J = 8.1Hz, -CH-Ph); 6.38 (br s, 1H, NH);
7.39 (s, 5H, Ph).

Example 4 2- (N-phenyl) aminoethanol, triphenylphosphine, triethylamine, and carbon tetrachloride were used in the same manner as in Example 1 for 20 hours using 0.6 mmol and 5 ml of acetonitrile, respectively. , 3-phenyl-2-oxazolidone was produced at a conversion of 93%. The properties of the target substance fractionated and purified from the reaction product by the same method as in Example 2 were as follows. Melting point 79.8-80.4 ° C [literature value
78.3-79.2 ℃ (J. American Chemical Society, No. 77
Vol. 636 (1955))]. Infrared spectrum (cm ^-1 ) 1735 (C =
O). NMR spectrum (ppm) 3.43 (t, 2H, J = 8.0Hz, -CH
₂ -O); 4.31 (t, 2H, J = 8.0Hz, -CH ₂ -N); 4.44 (s, 2
H, -CH ₂ Ph); 7.34-7.26 (m, 5H, Ph).

Example 5 2-aminoethanol, triphenylphosphine, triethylamine and carbon tetrachloride were used in the same manner as in Example 1 using 0.6 mmol of each and 5 ml of acetonitrile.
Reacted for 20 hours. After removing the solvent under reduced pressure, the whole amount of the reaction product was dissolved in a small amount of 10% ethanol-chloroform solution, and the solution was injected into a column using silica gel as an adsorbent. Then, it was developed with a 10% ethanol-chloroform solution to obtain a 2-oxazolidone fraction with an isolated yield of 51%. The properties of the 2-oxazolidone fraction recrystallized and purified using ethyl acetate as a solvent were as follows. Melting point 90.0-90.6 ° C [literature value
90-91 ℃ (Chemische Berichte, Volume 21, 566 (1888))
]. Infrared spectrum (cm ^-1 ) 3263 (NH), 1733 (C = O)
. NMR spectrum (ppm) 3.65 (t, 2H, J = 8.0Hz, -CH
₂ -O); 4.47 (t, 2H, J = 8.0Hz, -CH ₂ -N); 5.86 (br s,
1H, NH).

Example 6 0.6 mmol of 3-aminopropanol, triphenylphosphine, triethylamine and carbon tetrachloride, respectively.
When 5 ml of acetonitrile was used and the reaction was performed for 20 hours in the same manner as in Example 1, 1-oxa- was obtained at a conversion of 33%.
3-Azacyclohexane-2-one was produced. After removing the solvent under reduced pressure, the whole amount of the reaction product was dissolved in a small amount of 10% ethanol-chloroform solution, and the solution was injected into a column using silica gel as an adsorbent. Then, it was developed with a 10% ethanol-chloroform solution to obtain a cyclic urethane fraction. The properties of the cyclic urethane fraction recrystallized and purified using ethyl acetate as a solvent are as follows. Melting point 83.4-84.5 ° C. Infrared spectrum (cm ^-1 ) 3264 (NH), 1702 (C = O). NMR spectrum (ppm) 1.98 (m, 2H, -CH _2- ); 3.37 (m, 2H, -CH _2-)
N); 4.30 (t, 2H, J = 5.2Hz, -CH ₂ -O); 7.00 (s, 1H,
NH).

Example 7 2-Phenylglycinol, triphenylphosphine,
Example 1 using 0.2 mmol of triethylamine and 0.1 mmol of carbon tetrachloride and 5 ml of acetonitrile, respectively.
When reacted for 20 hours with the same method as above, the conversion rate was 4% and 4
-Phenyl-2-oxazolidone was produced.

Example 8 Example 1 using 0.2 mmol of 2-phenylglycinol, carbon tetrachloride, and 0.1 mmol of triphenylphosphine and 5 ml of acetonitrile, respectively.
When the reaction was performed for 20 hours using the same method as above, the conversion rate was 49%.
-Phenyl-2-oxazolidone was produced.

Example 9 2- (N-benzyl) aminoethanol, triphenylphosphine, hexachloroethane, and triethylamine were used in an amount of 0.2 mmol and 5 ml of acetonitrile, respectively, and reacted for 20 hours in the same manner as in Example 1. 3-Benzyl-2-oxazolidone was produced at a conversion of 33%.

Example 10 2-Phenylglycinol, trimethylphosphite,
0.2 mol each of carbon tetrachloride and triethylamine
When 1 and 5 ml of acetonitrile were used and reacted for 20 hours in the same manner as in Example 1, 4-phenyl-2-oxazolidone was produced at a conversion of 75%.

EXAMPLE 11 2-Phenylglycinol, triphenylphosphite, carbon tetrachloride, and triethylamine were each added to 0.1 wt.
When 2 mmol and 5 ml of acetonitrile were used and the reaction was carried out for 20 hours in the same manner as in Example 1, 4-phenyl-2-oxazolidone was produced at a conversion of 68%.

[0026]

As described above, according to the present invention, by reacting carbon dioxide gas and aminoalcohol under normal pressure, a cyclic urethane compound having a high added value can be obtained in a high yield and treatment of an organic halogen compound can be performed. It can be done together. The obtained cyclic urethane compound is expected to be used as a raw material for synthesizing pharmaceuticals, a synthetic intermediate for highly functional liquid crystal materials, and the like. Moreover, the method of the present invention is an economical means for simultaneously solving two major environmental problems of global warming and ozone layer depletion.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hiroaki Okuno 1-1, Higashi, Tsukuba-shi, Ibaraki Industrial Technology Institute of Chemical Technology

Claims (1)

[Claims] 1. A process for producing a cyclic urethane compound, which comprises reacting an amino alcohol with carbon dioxide in the presence of a tertiary amine, a trivalent organic phosphorus compound, and an organic halogen compound.