A synthesis of the dienone 7 via an efficient intramolecular Stille cross-coupling reaction, an improved chromium(II)-mediated synthesis of (E)-alkenylstannanes from aldehydes using Bu3SnCHI2 in DMF, and a synthesis of the substituted (â)-dienone 25 via ring-closing alkene metathesis to give dihydropyran 22 are described. The synthesis of (â)-dienone 25 constitutes a formal synthesis of (â)-periplanone-B.
描述了一种通过高效的分子内Stille交叉耦合反应合成dienone 7,利用Bu3SnCHI2在
DMF中改进的
铬(II)介导的合成(E)-烯丙基
锡化合物的反应,以及通过环闭合烯烃重排合成取代的(–)-dienone 25,得到二氢
吡喃22。(–)-dienone 25的合成构成了(–)-periplanone-B的正式合成。