An Expeditious Synthesis of the C(38)−C(54) Halichondrin B Subunit
作者:Steven D. Burke、Brian C. Austad、Amy C. Hart
DOI:10.1021/jo981181e
日期:1998.10.1
Halichondrin B: synthesis of the C(37)–C(54) subunit
作者:Brian C Austad、Amy C Hart、Steven D Burke
DOI:10.1016/s0040-4020(02)00050-9
日期:2002.3
bis(dihydroxylation) set the C(40), C(41), C(47), and C(48) stereocenters, and the resulting bicyclic spiroketal 8a was oxidized to tetracyclicbis(lactone) 2a. Alcohol 13 was isolated from the mono-functionalization of bis(lactone) 2a via a carbonyl methylenation/hydroboration protocol. Chelation-controlled allylation of the derived aldehyde, followed by diastereoselective iodocarbonate formation and hydrolysis