Synthesis of vinylcyclopropanes via palladium-catalyzed coupling of cyclopropylzinc halides with vinyl iodides. Total syntheses of (±) -prezizanol and (±)-prezizaene
作者:Edward Piers、Michel Jean、Peter S. Marrs
DOI:10.1016/s0040-4039(00)95593-x
日期:——
Palladium(O)-catalyzedcoupling of cyclopropylzinc halides, readily prepared from the corresponding cyclopropyl (tri--butyl)stannanes, with vinyl iodides provides good yields of functionalized vinylcyclopropanes. The coupling reaction is used as a key step in total syntheses of the sesquiterpenoids (±)-prezizanol and (±)-prezizaene.
Stereocontrolled synthesis of (-)-prezizanol,(-)-prezizaene, their epimers and (-)-allokhusiol
作者:Kazutoshi Sakurai、Takeshi Kitahara、Kenji Mori
DOI:10.1016/s0040-4020(01)81359-4
日期:1990.1
(-)-Prezizanol (-)-1, (-)-prezizaene (-)-2, isolated from Diels, and their epimers, 5 and 6, were synthesized employing β-keto ester 7, readily available from ()-(+)-pulegone, as a starting material. -Epimers, 5 and 6 were obtained with over 95 % stereoselectivity reductive methylation of enone 22. The natural isomers, (-)-1 and (-)-2, were synthesized hydroxy-directed hydrogenation of the corresponding allylic
作者:Peter J. Carrol、Emilio L. Ghisalberti、David E. Ralph
DOI:10.1016/s0031-9422(00)94442-x
日期:——
Abstract The structures of three new tricyclicsesquiterpenesfrom Eremophila georgei are described. The absolute stereochemistry of these sesquiterpenes is shown to be antipodal to that of the zizane sesquiterpenes of vetiver oil.