合成这些 en 15 etapes a partir de la dimethyl-4,4 cyclopentene-2one。La Formation des noyaux cyclopentanes est obtenue par une double added d'un reactif Organiccuivrique fonctionnalise suivie d'une cyclisation aldol
We describe a stereoselectivesynthesis of the triquinane (±)-cameroonanol using the Lewis acid mediated [3+2] cyclo-addition of an allylsilane and a modified Fleming-Tamao oxidation as key steps.
[reaction: see text]The structure and relative stereochemistry of the novel silphiperfolane-type sesquiterpene cameroonan-7alpha-ol (1) were confirmed by a total synthesis of (+/-)-1 from 3,3,5-trimethylbicyclo[3.3.0]oct-1(8)-en-2-one (6) by means of a Sakurai reaction with (Z)-crotylsilane, free radical hydrobromination, base-inducedcyclization, and LiAlH4 reduction.
Cycloaddition of allylsilanes. Part 20: Organosilicon-mediated total synthesis of (±)-cameroonanol
作者:Arndt W. Schmidt、Thomas Olpp、Sören Schmid、Anne Jäger、Hans-Joachim Knölker
DOI:10.1016/j.tet.2009.01.115
日期:2009.7
We describe a seven-step total synthesis of the triquinane sesquiterpene (±)-cameroonanol using a Lewis acid-promoted [3+2] cycloaddition of an allylsilane and a modified Fleming–Tamao oxidation as key reactions.