Stereoselective Construction of Copaborneol and Longiborneol Frameworks by Intramolecular Double Michael Reaction
作者:Masataka Ihara、Kei Makita、Yuki Fujiwara、Yuji Tokunaga、Keiichiro Fukumoto
DOI:10.1021/jo960698s
日期:1996.1.1
3.0.0(3,9)]undecane 26, the basic skeletons of copaborneol and longiborneol, were achieved by the intramolecular double Michael reactions of 2-cyclopenten-1-ones 15-17. The substrates were prepared starting with tricyclo[5.2.1.0(2,6)]deca-4,8-dien-3-one (6). The intramolecular double Michael reactions were carried out under three different conditions: TMSCl-Et(3)N-ZnCl(2), TMSI-(TMS)(2)NH, and Bu(2)BOTf-(TMS)(2)NH
三环[5.3.0.0(3,8)]癸烷22和三环[6.3.0.0(3,9)]十一烷26的立体选择性合成是通过2-的分子内双迈克尔反应完成的环戊烯-1-酮15-17。从三环[5.2.1.0(2,6)] deca-4,8-dien-3-one(6)开始制备底物。分子内双迈克尔反应是在三种不同条件下进行的:TMSC1-Et(3)N-ZnCl(2),TMSI-(TMS)(2)NH和Bu(2)BOTf-(TMS)(2)NH 。使用后两种试剂系统以高收率构造了长冰片醇的骨架26。