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]。