EP0244810A1
Expired / Lapsed
EP
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Process for producing 2-oxazolidinones
Assignee: Mitsui Toatsu Chemicals Inc
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Filing: 1987-05-05
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Granted: —
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Expires: 2007-05-05
Abstract
Abstract An improved process for producing a 2-oxazolidinone of the formula wherein R represents hydrogen atom or a lower alkyl group and R 1 and R 2 are the same as or different and each represent hydrogen atom or a lower alkyl group, by reacting an amino-alcohol of the formula wherein R, R 1 and R 2 are each as defined above, and/or its hydrochloride, with phosgene is provided, which process is characterized by carrying out the reaction substantially in the presence of water and a dehydrochlorinating agent, preferably while keeping the pH of the reaction liquid within a range of 3.0 to 10.0 with the dehydrochlorinating agent in water solvent.
Inventors
- 👤 Nobuyuki Kajimoto
- 👤 Tereuyuki Nagata
- 👤 Masaru Wada
- 👤 Akihiro Tamaki
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-07 08:40
CPC Classifications
C; C07; C07D; C07D263/00; C07D263/02; C07D263/04; C07D263/06; C07D263/08; C07D263/16; C07D263/18; C07D263/20; C07D263/22
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
88 words
A process for producing a 2-oxazolidinone expressed by the formula (II) wherein R represents hydrogen atom or a lower alkyl group and R 1 and R 2 are the same as or different from one another and each represent hydrogen atom or a lower alkyl group, by reacting an amino-alcohol expressed by the formula (I) wherein R, R 1 and R are each as defined above, and/or its hydrochloride, with phosgene, which process comprises carrying out said reaction substantially in the presence of water and a dehydrochlorinating agent.
Claim 2
Dependent Claim
88 words
A process for producing a 2-oxazolidinone expressed by the formula (II) wherein R represents hydrogen atom or a lower alkyl group and R 1 and R 2 are the same as or different from one another and each represent hydrogen atom or a lower alkyl group, by reacting an amino-alcohol expressed by the formula (I) wherein R, R 1 and R are each as defined above, and/or its hydrochloride, with phosgene, which process comprises carrying out said reaction substantially in the presence of water and a dehydrochlorinating agent.
Claim 3
Dependent Claim
98 words
A process for producing a 2-oxazolidinone expressed by the formula (II) wherein R represents hydrogen atom or a lower alkyl group and R 1 and R 2 are the same as or different from one another and each represent hydrogen atom or a lower alkyl group, by reacting an amino-alcohol expressed by the formula (I) wherein R, Rand R are each as defined above, and/or its hydrochloride, with phosgene, which process comprises carrying out said reaction while keeping the pH of the reaction liquid within a range of 3.0 to 10.0 with a dehydrochlorinating agent in water solvent.
Claim 4
Dependent Claim
98 words
A process for producing a 2-oxazolidinone expressed by the formula (II) wherein R represents hydrogen atom or a lower alkyl group and R 1 and R 2 are the same as or different from one another and each represent hydrogen atom or a lower alkyl group, by reacting an amino-alcohol expressed by the formula (I) wherein R, Rand R are each as defined above, and/or its hydrochloride, with phosgene, which process comprises carrying out said reaction while keeping the pH of the reaction liquid within a range of 3.0 to 10.0 with a dehydrochlorinating agent in water solvent.
Claim 5
Dependent Claim
17 words
A process according to claim 2 wherein said pH is within a range of 5.0 to 8.0.
Claim 6
Dependent Claim
15 words
A process according to claim 1 wherein said dehydrochlorinating agent is an alkali metal compound.
Claim 7
Dependent Claim
15 words
A process according to claim 2 wherein said dehydrochlorinating agent is an alkali metal compound.
Claim 8
Dependent Claim
14 words
A process according to claim 1 wherein said dehydrochlorinating agent is a tertiary amine.
Claim 9
Dependent Claim
14 words
A process according to claim 2 wherein said dehydrochlorinating agent is a tertiary amine.
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