Synthesis of the Bis-spiroacetal Moiety of Spirolides B and D
作者:Kai Meilert、Margaret A. Brimble
DOI:10.1021/ol051260u
日期:2005.8.1
An enantioselectivesynthesis of the bis-spiroacetal fragment of spirolides B and D is reported. The carbon framework was constructed via Barbier reaction of dihydropyran 3 with aldehyde 4, followed by a double oxidative radical cyclization to construct the bis-spiroacetal. A silyl-modified Prins cyclization and enantioselective crotylation successfully installed the stereocenters in the cyclization