The present invention relates to a process for the enzymatic resolution of racemic mixtures of N-(alkoxycarbonyl)-4-keto-D,L-proline alkyl esters, using Candida antarctica lipase fraction B (CALB) as enzyme catalyst to enantioselectively hydrolyze the alkyl ester of one of the two enantiomers present. Separating the unreacted N-(alkoxycarbonyl)-4-keto-D-proline alkyl ester from the N-(alkoxycarbonyl)-4-keto-L-proline, followed by hydrogenation of the keto group of the D-isomer and subsequent hydrolysis of the ester and N-(alkoxy-carbonyl) groups produces cis-4-hydroxy-D-proline in high yield. Diastereomeric mixtures of N-(alkoxycarbonyl)-4-hydroxyproline alkyl esters can also be resolved using CALB to ultimately produce cis-4-hydroxy-D-proline or trans-4-hydroxy-L-proline.
本发明涉及一种酶解法用于对N-(烷氧羰基)-4-酮-D,
L-脯氨酸烷基酯的外消旋混合物进行酶解,使用Candida antarctica
脂肪酶B(CALB)作为酶催化剂,对两个对映异构体中的一个的烷基酯进行对映选择性
水解。将未反应的N-(烷氧羰基)-4-酮-
D-脯氨酸烷基酯与N-(烷氧羰基)-
4-酮-L-脯氨酸分离,然后对D-异构体的酮基进行氢化,随后对酯和N-(烷氧羰基)基进行
水解,高产率地产生
顺式-4-羟基-D-脯氨酸。也可以使用CALB来酶解N-(烷氧羰基)-
4-羟基脯
氨酸烷基酯的对映异构体混合物,最终产生
顺式-4-羟基-D-脯氨酸或
反式-4-羟基-
L-脯氨酸。