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

摘要

The enantiomers of formulasare prepared in a sequence starting from the racemic compound of formulawherein 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.