Toward an Enantioselective Total Synthesis of Sarain A: Construction of an Advanced Intermediate and Rearrangement of the Sarain A Core under Mild Conditions
作者:Christopher J. Douglas、Sheldon Hiebert、Larry E. Overman
DOI:10.1021/ol050038m
日期:2005.3.1
A high-yielding N-sultonyliminium ion-enoxysilane cyclization and a ring-closing metathesis are key steps in the enantioselective synthesis of late-stage intermediates en route to sarain A. Also revealed is an unprecedented rearrangement of the tetracyclic sarain A core under mildly acidic conditions.