A novel condensation of (-)-phenylglycinol with γ,δ-epoxyketones is reported for the preparation of both enantiomers of cis-5-alkyl-2-hydroxymethyl pyrrolidines. The required epoxy-derivatives were easily prepared by epoxidation of the corresponding γ,δ-unsaturated ketones. Condensation with (-)-phenylglycinol is regiospecific and stereoselective, giving only two of the four possible diastereomers
据报道,(-)-苯基甘
氨醇与 γ,δ-环氧酮的新型缩合可用于制备顺式-5-烷基-2-羟甲基
吡咯烷的两种对映异构体。所需的环氧衍
生物很容易通过相应的 γ,δ-不饱和酮的环氧化来制备。与 (-)-苯基甘
氨醇的缩合具有区域专一性和立体选择性,仅产生四种可能的非对映异构体中的两种。环化产物的立体
化学由作为中间体形成的 N-未取代
恶唑烷中的 C-2 构型决定。