申请人:Sumitomo Chemical Company, Limited
公开号:US04496739A1
公开(公告)日:1985-01-29
A process for preparing an optically active cis-1,3-dibenzylhexahydro-1H-furo[3,4-d]imidazole-2,4-dione of the formula: ##STR1## wherein an asterisk (*) indicates an asymmetric carbon, Bzl represents a benzyl group and the 3a- and 6a-positions take the cis-configuration, which comprises reducing selectively an optically active cis-imidazolidinedicarboxylic acid monoester of the formula: ##STR2## wherein R is a C.sub.1 -C.sub.6 alkyl group and Bzl is as defined above with a reducing agent at either one of the carboxyl group and the alkoxycarbonyl group in the said monoester, followed by cyclization, the said monoester being the one obtainable by hydrolysis of a cis-imidazolidinedicarboxylic acid diester of the formula: ##STR3## wherein R and Bzl are each as defined above with an enzymatic material having a capability of hydrolyzing the ester group in the said diester.
一种制备光学活性的顺式-1,3-二苄基六氢-1H-呋喃[3,4-d]咪唑-2,4-二酮的方法,其化学式为:其中星号(*)表示不对称碳,Bzl代表苄基团,3a-和6a-位置采用顺式构型,包括选择性还原光学活性的顺式-咪唑烷二羧酸单酯,其化学式为:其中R为C.sub.1-C.sub.6烷基团,Bzl如上定义,使用还原剂在该单酯的羧基团或烷氧羰基团中的任一处进行还原,然后进行环化,所述单酯是通过水解顺式-咪唑烷二羧酸二酯而得到的,其化学式为:其中R和Bzl如上定义,与具有水解所述二酯中酯基的能力的酶材料一起。