A novel optically active cis-4,5-disubstituted imidazoli- din-2-one derivative of the formula;
wherein R1 is a C,-C4 alkyl group or benzyl and R2 is a chiral aralkyl group optionally containing at least one C1-C4 alkyl, C1-C4 alkoxy or hydroxyl group is produced asymmetrically by the reaction of 1,3-dibenzyl-cis-4,5-dicarboxy- imidazolidin-2-one or its anhydride with an optically active secondary amine of the formula:
wherein R1 and R2 are each as defined above and is transformed into the lactone of 1,3-dibenzyl-cis-4-carboxy-5-hydroxymethyl-imidazolidin-2-one, which is a key intermediate in the synthesis of d-biotin.
一种新型光学活性顺式-4,5-二取代
咪唑-2-
酮衍
生物,其式如下
其中 R1 为 C,-C4烷基或
苄基,R2 为手性烷基,可选含有至少一个 C1-C4 烷基、C1-C4 烷
氧基或羟基,由 1,3-二
苄基-顺式-4,5-二羧基
咪唑啉-2-
酮或其酐与式中光学活性仲胺反应不对称生成:
其中 R1 和 R2 分别如上文所定义,并转化为 1,3-二
苄基-顺式-4-羧基-
5-羟甲基-
咪唑烷-2-
酮的内
酯,它是合成 d-
生物素的关键
中间体。