A Short and Efficient Synthesis of (±)-Modhephene by a Stereoelectronically-Controlled Ene-Reaction
作者:Wolfgang Oppolzer、Kurt Bättig
DOI:10.1002/hlca.19810640756
日期:1981.11.4
(±)-Modhephene (6) has been synthesized from the easily available trimethylpentalenone 1 in 6 steps in 26% overall yield (Scheme 2). The remarkably smooth 1,4-addition/enolate trapping 1 2 and subsequent selenoxide elimination after oxidation furnished the key intermediate 3 which underwent an expedient and highly stereoselctive intramolecular ene-reaction to give the propellane 4, readily convertible
(±)-Modhephene(6)是由易于获得的三甲基戊烯酮1分6个步骤合成的,总产率为26%(方案2)。明显光滑的1,4加成/烯醇盐捕集1 2和随后氧化后的亚硒酸酯消除提供了关键中间体3,该中间体进行了方便且高度立体选择性的分子内烯反应,生成了易于转化为(±)-6的丙炔4。