Sterically Biased 3,3-Sigmatropic Rearrangement of Azides: Efficient Preparation of Nonracemic α-Amino Acids and Heterocycles
作者:David Gagnon、Sophie Lauzon、Cédrickx Godbout、Claude Spino
DOI:10.1021/ol052034n
日期:2005.10.1
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。