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。