申请人:NIPPON RIKAGAKUYAKUHIN CO., LTD.
公开号:EP0213785A1
公开(公告)日:1987-03-11
Method for optical resolution of DL-cysteine by - (1) reacting DL-cysteine with formaldehyde to prepare DL-thiazolidine-4-carboxylic acid (DL-TCA), (2) forming diastereomer salts of D-TCA and of L-TCA by reacting DL-TCA with an optically active 1-(1-naphthyl)ethylamine, (3) separating said diastereomer salts by difference of the solubilities thereof in a solvent, (4) recovering D-TCA from said diastereomer salt of D-TCA and finally obtain D-cysteine, and recovering L-TCA from said diastereomer salt of L-TCA and finally obtain L-cysteine.
Method for optical resolution of (R,S)-1-(1-naphthyl)ethylamine (R,S)-NEA by (1) reacting an optically active cysteine with formaldehyde to prepare an optically active thiazolidine-4-carboxylic acid, (2) forming diastereomer salts of (R)-NEA and of (S)-NEA by reacting (R,S)-NEA with optically active thiazolidine-4-carboxylic acid, (3) separating said diastereomer salts of (R)-NEA and of (S)-NEA by difference of the solubilities thereof in a solvent, (4) recovering (R)-NEA from said diastereomer salt of (R)-NEA, and recovering (S)-NEA from said diastereomer salt of (S)-NEA.
(1) DL-半胱氨酸与甲醛反应制备 DL-噻唑烷-4-羧酸(DL-TCA),(2) DL-TCA 与具有光学活性的 1-(1-萘基)乙胺反应形成 D-TCA 和 L-TCA 的非对映异构盐、(4) 从 D-TCA 的非对映体盐中回收 D-TCA,最终得到 D-半胱氨酸,从 L-TCA 的非对映体盐中回收 L-TCA,最终得到 L-半胱氨酸。
通过以下方法对(R,S)-1-(1-萘基)乙胺(R,S)-NEA 进行光学解析:(1) 使光学活性半胱氨酸与甲醛反应,制备光学活性噻唑烷-4-羧酸;(2) 使(R、(3) 通过(R)-NEA 和(S)-NEA 在溶剂中的溶解度差异,分离(R)-NEA 和(S)-NEA 的非对映异构体盐;(4) 从(R)-NEA 的非对映异构体盐中回收(R)-NEA,并从(S)-NEA 的非对映异构体盐中回收(S)-NEA。