The conversion of (1R,2S)-norephedrine into a novel chiral diamine (83% yield, simple two step synthesis) and its use as a chiral base in two epoxide rearrangement reactions is reported. Rearrangement of a 4,5-disubstituted cyclohexene oxide and of a 4-aminosubstituted cyclopentene oxide generated allylic alcohols of >90% ee. These results represent the highest levels of enantioselectivity reported
报道了(1 R,2 S)-去氧
麻黄碱向新型手性二胺的转化(83%收率,简单的两步合成)及其在两个
环氧化物重排反应中作为手性碱的用途。4,5-二取代的
环己烯氧化物和4-
氨基取代的
环戊烯氧化物的重排产生> 90%ee的烯丙基醇。这些结果代表了迄今为止报道的此类底物的最高对映选择性
水平。