Stereoselective Total Synthesis of Copa and Ylango Sesquiterpenoids: (−)-Copacamphene, (−)-Cyclocopacamphene, (+)-Sativene, (+)-Cyclosativene
作者:Edward Piers、M. Bert Geraghty、R. Dean Smillie、Marcel Soucy
DOI:10.1139/v75-404
日期:1975.10.1
tricyclic sesquiterpenoids (−)-copacamphene (1) and (+)-sativene (3) and of the related tetracyclic compounds (−)-cyclocopacamphene (2) and (+)-cyclosativene (4) are described. An efficient four-step synthetic sequence was employed to convert the bicyclic dione 5 into the olefinic ketone 8. The latter compound was converted in four steps into the olefinic alcohol 23. Eliminative cyclization of the corresponding