good yield from alkylidene cyclopropanes, as racemates or as an enantiomerically enriched mixture of stereoisomers (e.e.>60%) depending upon the method used. Optically active cyclobutanones which are intermediate in the process have been in some cases isolated. We show the limitations of a competitive method previously described and point out its weak step.
取决于所使用的方法,已由亚烷基
环丙烷以外消旋体或立体异构体的对映异构体富集的立体异构体混合物(ee> 60%)的高产率生产了
γ-丁内酯。在某些情况下,已经分离出了该方法中间的旋光
环丁酮。我们展示了前面描述的竞争方法的局限性,并指出了它的弱点。