A total synthesis of (±)-isocomene and (±) β-isocomene by an intramolecular ene reaction
作者:W. Oppolzer、K. Bättig、T. Hudlicky
DOI:10.1016/0040-4020(81)80001-4
日期:1981.1
sesquiterpenes isocomene 1 and β-isocomene 22 have been synthesized starting from 1,7-octadien-3-one 10 in a stereoselective manner. In the key step 12 → 13 (Scheme 5) the C-7, C-8-bond was formed by an intramolecular thermal ene reaction. Further transformations of 13 (Scheme 6) involved successively ring contraction 18 → 19, elimination 21 → 22 and olefin isomerization 22 → 1.
从1,7-辛二烯-3-酮10开始以立体选择性的方式合成了外消旋倍半萜烯异烯1和β-异烯22。在关键步骤12 → 13中(方案5),通过分子内热烯反应形成C-7,C-8键。13的进一步转化(方案6)涉及到环收缩18 → 19,消除21 → 22和烯烃异构化22 → 1。