PROCESS FOR PRODUCING NITROGENOUS HETEROCYCLIC COMPOUND
申请人:Toray Fine Chemicals Co., Ltd.
公开号:EP1640364A1
公开(公告)日:2006-03-29
A nitrogenous heterocyclic compound such as 3-aminopyrrolidine derivative is produced by hydrogenolysis of an N-substituted nitrogenous heterocyclic compound with normal pressure hydrogen in a water-based solvent in presence of a catalyst. In the case an optically active 1-substituted-3-aminopyrrrolidine derivative is used as a raw material, an optically active 3-aminopyrrolidine derivative can be obtained as a product practically without racemination.
Process for producing O,O'-diacyltartaric anhydride and process for
申请人:Toray Industries, Inc.
公开号:US05451687A1
公开(公告)日:1995-09-19
An industrial process for producing O,O'-diacyltartaric anhydride with high purity and high efficiency is disclosed. According to the process of the invention, a carboxylic acid of the formula (I): R.sup.1 COOH (I) (wherein R.sup.1 represents C.sub.1 -C.sub.4 alkyl group; phenyl group; or phenyl group substituted with 1-5 C.sub.1 -C.sub.4 alkyl groups or with 1-5 halogen atoms) is reacted with tartaric acid in the presence of a chlorinating agent.
Process for producing nitrogenous heterocyclic compound
申请人:Morii Seiji
公开号:US20060270847A1
公开(公告)日:2006-11-30
A nitrogenous heterocyclic compound such as 3-aminopyrrolidine derivative is produced by hydrogenolysis of an N-substituted nitrogenous heterocyclic compound with normal pressure hydrogen in a water-based solvent in presence of a catalyst. In the case an optically active 1-substituted-3-aminopyrrrolidine derivative is used as a raw material, an optically active 3-aminopyrrolidine derivative can be obtained as a product practically without racemination.
Crystals of an aromatic 0,0'-diacyltartaric acid of the formula (VIII):
wherein R2 and R3 are the same as or different from one another and each is a hydrogen atom, halogen atom or C1 - C4 alkyl group are sufficiently uniform in size that 95% to 98% of them pass through a 20-mesh sieve. Such crystals may be prepared by hydrolyzing an aromatic carboxylic anhydride of the formula (IV):
wherein R2 and R3 are as defined above, to form the corresponding acid (VIII) in the form of an oil and crystallizing the acid in the presence of an organic solvent which is immiscible with water to form crystals of the hydrate of the acid (VIII). For the crystallization process, each of the organic solvent immiscible with water and seed crystals of the acid (VIII) are added to the oil of the acid (VIII) present in the reaction mixture.
Method of preparing (3R,4S)-3-acetamido-4-allyl-n-(tert-butyl)pyrrolidine-3-carboxamide
申请人:CALITHERA BIOSCIENCES, INC.
公开号:US10906872B2
公开(公告)日:2021-02-02
A method is provided to conveniently separate racemic (3R,4S)-3-acetamido-4-allyl-N-(tert-butyl)pyrrolidine-3-carboxamide and (3S,4R)-3-acetamido-4-allyl-N-(tert-butyl)pyrrolidine-3-carboxamide using selective crystallization with chiral carboxylic acids.