申请人:SUMITOMO CHEMICAL COMPANY, LIMITED
公开号:EP0092194A1
公开(公告)日:1983-10-26
A method of separating optically active half esters comprising optically resolving a mixture of a (4S,5R)-1,3-dibenzyl-5-alkoxy or alkenyloxycarbonyl-2-oxoimidazolidine-4-carboxylic acid and a (4R,5S)-1,3-dibenzyl-5-alkoxy or alkenyloxycarbonyl-2-oxoimidazolidine-4-carboxylic acid, each being represented by the formula (I):
wherein R1 is an alkyl group or an alkenyl group, each having 1 to 5 carbon atoms; Bzl is a benzyl group; * indicates an asymmetric carbon atom; and the 4- and 5-positions are a cis-configuration, using an optically active d- or 1-amine represented by the formula (II):
wherein R2 and R3 are each a hydrogen atom, a halogen atom or methyl group; and indicates an asymmetric carbon atom; and the eforementioned half esters are disclosed. A method for the preparation of an optically active (4S,5R)-cis-1,3-dibenzyl-5-methoxy- or ethoxycarbonyl-2-oxoimidazolidine-4-carboxylic acid (la') or (4R,5S)-cis-1,3-dibenzyl-5-methoxy- or ethoxycarbonyl-2-oxoimidazolidine-4-carboxylic acid (Ib'), comprising preferentially crystallizing (Ia') or (Ib') from a supersaturated solution where (la' ) and (Ib') are copresent in the presence of crystals of the same type of optically active half ester as that to be crystallized, is also disclosed.
一种分离光学活性半酯的方法,包括光学解析(4S,5R)-1,3-二苄基-5-烷氧基或烯酰氧基羰基-2-氧代咪唑烷-4-羧酸和(4R,5S)-1,3-二苄基-5-烷氧基或烯酰氧基羰基-2-氧代咪唑烷-4-羧酸的混合物,各自由式(I)表示:
其中 R1 是烷基或烯基,各具有 1 至 5 个碳原子;Bzl 是苄基;* 表示不对称碳原子;4 位和 5 位为顺式构型,使用由式(II)表示的具有光学活性的 d- 或 1-胺:
其中 R2 和 R3 各为氢原子、卤素原子或甲基;且表示不对称碳原子;本发明公开了上述半酯。一种制备光学活性(4S,5R)-顺式-1,3-二苄基-5-甲氧基-或乙氧基羰基-2-氧代咪唑烷-4-羧酸(la')或(4R,5S)-顺式-1,3-二苄基-5-甲氧基-或乙氧基羰基-2-氧代咪唑烷-4-羧酸(Ib')的方法、本发明还公开了(Ia')或(Ib')从过饱和溶液中优先结晶的方法,其中(la')和(Ib')在与待结晶的光学活性半酯类型相同的晶体存在下共存。