Novel monoesters of cis-cyclopentenediol, process for preparation
申请人:Kowa Company, Ltd.
公开号:US04170596A1
公开(公告)日:1979-10-09
A novel monoester of cis-cyclopentenediol of the following formula ##STR1## wherein ##STR2## is an optically active acyl moiety. The monoester can be prepared by reacting cis-2-cyclopentene-1,4-diol with an optically active carboxylic acid of the following formula ##STR3## wherein ##STR4## is the same as defined above, or its reactive derivative, and separating the resulting reaction product into the two individual diastereomers. Lactones can be prepared from the monoesters selectively and with commercial advantage.
In order to explore the general application of a novel method for preparing optically active compounds, synthesis of the opticallypure steroid intermediate((−)-1) has been examined by employing the diol(2) as a meso-compound and N-mesyl-(S)-phenylalanyl chloride(3) as a source of the optically active functional group.