Studies towards Simalikalactone D and Quassimarin: Construction of an Advanced Pentacyclic Intermediate
作者:Tony K. M. Shing、Xue Y. Zhu、Yeung Y. Yeung
DOI:10.1002/chem.200305158
日期:2003.11.21
target molecules simalikalactone D and quassimarin, has been synthesized from (S)-(+)-carvone in 21 steps and with an overall yield of 12 %. The synthesis is efficient, stereocontrolled, enantiospecific, and chirality productive, creating eight new chiral centres in pentacycle, and should provide opportunities for rapid access to simalikalactone D analogues and other bioactive quassinoids. The reaction
由(S)-(+)-香芹酮分21步合成了高级五环中间体,该中间体可进一步加工成目标分子simalikalactone D和quassimarin,其总收率为12%。该合成是有效的,立体控制的,对映体特异性的和手性生产性的,在五环中创建了八个新的手性中心,并且应提供机会快速获得马卡内酯D类似物和其他生物活性类胡萝卜素。反应顺序包括区域选择性的双羟甲基化,立体控制的环氧化,环氧亚甲基桥的形成,1,3-σ重排和分子内Diels-Alder反应作为关键步骤。