Vinylogous Mukaiyama aldol type reaction of chiral non-racemic silyloxypyrroles followed by acidic treatment affords an efficient asymmetric access to 1-azaspiro[4.4]nonanes in high diastereoisomeric excess (up to 79%).
在酸性处理后,通过手性非消旋
硅氧
吡咯的Vinylogous Mukaiyama醛醇型反应,实现了1-氮杂螺[4.4]
壬烷的高效不对称合成,其立体异构体过量高达79%。