Process and intermediates for the synthesis of the enantiomers of bicyclo(4.2.0)oct-2-en-7-one and derivatives and for the synthesis of bicyclo(4.2.0)octane derivatives
申请人:SYNTEX (U.S.A.) INC.
公开号:EP0257610A2
公开(公告)日:1988-03-02
The enantiomers of formulas
are prepared in a sequence starting from the racemic compound of formula
wherein X is hydrogen or bromo when Y is bromo, or X is chloro when Y is chloro.
The key step of this process involves a microbial reduction of the compound of formula (3) to give a ketone and an alcohol of high enantiomeric purity. The compounds of formulas (1) and (2) are intermediates for the preparation of certain bicyclo[4.2.0]octane derivatives.
式的对映体是按以下顺序制备的
的对映体是由式
其中,当 Y 为溴时,X 为氢或溴,当 Y 为氯时,X 为氯。
该工艺的关键步骤是对式(3)化合物进行微生物还原,得到对映体纯度很高的酮和醇。式 (1) 和 (2) 的化合物是制备某些双环[4.2.0]辛烷衍生物的中间体。
Application of bakers' yeast-mediated reductions of bicyclo[4.2.0]oct-2-en-7-ones to the enantioselective synthesis of prostacyclin analogs