| 摘要 |
Disclosed are a process for preparing an optically active 2-oxoimidazolidine derivative of the formula: <CHEM> wherein R<1> represents hydrogen atom or a lower alkyl group, according to the process described in the specification; and a 3-acyl-2-oxoimidazolidine-4-carboxylic acid ester derivative having (S, R) configuration of the formula: <CHEM> wherein R<2> represents a tert-butyl group or a benzyl group, and R<3> represents a lower alkyl group or an aryl group. |
