α,α‘-Annulation of 2,6-Prenyl-Substituted Cyclohexanone Derivatives with Malonyl Chloride: Application to a Short Synthesis of (±)-Clusianone. Formation and Rearrangement of a Biogenetic-Like Intermediate
作者:Philippe Nuhant、Marc David、Thomas Pouplin、Bernard Delpech、Christian Marazano
DOI:10.1021/ol062736s
日期:2007.1.1
were found for the successful Effenberger alpha,alpha'-annulation of 3,3-dimethyl-2,4,6-triprenyl cyclohexanone silyl enol ethers with malonyl chloride to give the corresponding bicyclo[3.3.1]nonane-trione in 35% yield, this result allowing a short synthesis of (+/-)-clusianone. An isomeric rearranged bicyclo[3.3.1]nonane-trione was also isolated in 25% yield, and changing the Lewis acid resulted in
为成功地将3,3-二甲基-2,4,6-三甲苯基环己酮甲硅烷基烯醇醚与丙二酰氯的Effenbergerα,α'环化找到条件,得到了35%的相应双环[3.3.1]壬烷三酮产率,该结果允许短合成(+/-)-clusianone。还以25%的收率分离了异构体重排的双环[3.3.1]壬烷-三酮,改变路易斯酸导致以38%的收率形成了经黄酮基取代的间苯三酚衍生物。这两种最后产物的形成机制模拟了PPAP的生物遗传途径。[反应:请参见文字]。