Enantiospecific total synthesis of (-)-megaphone by a highly controlled consecutive 1,4- and 1,3-asymmetric induction
作者:Kiyoshi Tomioka、Hisashi Kawasaki、Yōichi Iitaka、Kenji Koga
DOI:10.1016/s0040-4039(00)61960-3
日期:1985.1
Enantiospecific totalsynthesis of (-)-megaphone (1) is reported. The key synthetic tactic is the use of (4)-2-ethylidene-4-trityloxymethyl-butan-4-olide (6) to both establish the relative and absolute stereochemistry of the contiguous tertiary and quaternary carbon centers by a highly controlled 1,4- and 1,3-asymmetricinduction and construct the 4-methoxy-6,6-dialkyl-cyclohexenone portion of 1.