reactions starting from the chiral auxiliary p-menthane-3-carboxaldehyde. The key feature of the sequence is a highly selective tandem Mitsunobu/3,3-sigmatropic rearrangement of hydrazoic acid that procures enantiomerically enriched allylic azides. The sequence is either terminated by oxidative cleavage to provide amino acids or by ring-closing metathesis to provide heterocycles or carbocycles bearing nitrogen
[反应:见正文]通过手性辅助对
薄荷脑3-
甲醛醛的短反应序列,可以有效地构建手性
α-氨基酸,杂环和碳环。该序列的关键特征是高选择性串联的Mitsunobu /3,3-σ嗜酸重排,可产生对映异构体富集的烯丙基
叠氮化物。该序列通过氧化裂解终止以提供
氨基酸或通过闭环易位终止以提供带有氮的杂环或碳环。