Intramolecular additions of allylsilanes to conjugated dienones. Direct stereoselective syntheses of (.+-.)-neolemnanyl acetate and (.+-.)-neolemnane
摘要:
The total synthesis of the marine sesquiterpenes neolemnanyl acetate (1) and neolemnane (2) is reported. An intramolecular allylsilane addition to a conjugated dienone is used to assemble the basic 6,8-fused skeleton. Functionalization of the cyclooctane ring was achieved by means of a regiospecific photooxygenation.
The total synthesis of the marine sesquiterpenes neolemnanyl acetate (1) and neolemnane (2) is reported. An intramolecular allylsilane addition to a conjugated dienone is used to assemble the basic 6,8-fused skeleton. Functionalization of the cyclooctane ring was achieved by means of a regiospecific photooxygenation.
Neolemnane and eremophilane sesquiterpenoids from the pacific soft coral lemnalia africana
作者:Richard R. Izac、William Fenical、Bruce Tagle、Jon Clardy