Total Synthesis of (±)-Silphinene: non photochemical cyclobutenic route to a crucial intermediate
作者:Michel Miesch、Laurence Miesch-Gross、Michel Franck-Neumann
DOI:10.1016/s0040-4020(96)01159-3
日期:1997.2
The cyclobutenic ester 1, readily available by thermal [2+2] cycloaddition of the silyl enol ether derived from cyclopentanone with ethyl propynoate, is easily transformed into the diquinanic alcohol 3 via the bicycle [2.1.0] pentane intermediate 2. After protection as the thexyldimethylsilyl ether, an allylic oxidation stereospecifically introduces a hydroxyl group at position 8. Following formation of the benzyl ether, the diquinane 9 was then transformed in four steps into the triquinane 20 using a silyl-assisted Nazarov type cyclisation. From this intermediate, (+/-)-silphinene has previously been synthesized. (C) 1997, Elsevier Science Ltd.