Sterically Biased 3,3-Sigmatropic Rearrangement of Chiral Allylic Azides: Application to the Total Syntheses of Alkaloids
作者:Sophie Lauzon、François Tremblay、David Gagnon、Cédrickx Godbout、Christine Chabot、Catherine Mercier-Shanks、Stéphane Perreault、Hélène DeSève、Claude Spino
DOI:10.1021/jo800817p
日期:2008.8.1
We describe a tandem Mitsunobu/3,3-sigmatropic rearrangement of allylic azides on a chiral auxiliary system that favors one regioisomer thanks to its exceptional steric bias. The sequence may be completed by the oxidative cleavage of the auxiliary or by a ring-closing metathesis reaction that produces a carboor heterocycle directly and a recyclable form of the chiral auxiliary. Applications of the methodology to the total synthesis of (+)-coniine, (+)-lentiginosin, and (+)-pumiliotoxin C are reported.