Total Synthesis of the Securinega Alkaloid (−)-Secu’amamine A
作者:Peng Liu、Sungwoo Hong、Steven M. Weinreb
DOI:10.1021/ja802700z
日期:2008.6.18
The first enantioselective total synthesis of the rearranged Securinega alkaloid (-)-secu'amamine A is reported starting from D-proline as the source of absolute chirality. The synthesis requires 15 steps starting from D-proline-derived N-trityl aldehyde 11 and proceeds in approximately 9% overall yield. Key steps include a stereoselective conjugate addition of pyrrolidino enedione 19 to afford indolizidine
据报道,以 D-脯氨酸作为绝对手性来源,首次对重排的 Securinega 生物碱 (-)-secu'amamine A 进行了对映选择性全合成。合成需要 15 个步骤,从 D-脯氨酸衍生的 N-三苯甲基醛 11 开始,并以大约 9% 的总产率进行。关键步骤包括吡咯烷烯二酮 19 的立体选择性共轭加成以提供作为主要产物的吲哚里西啶 24 和二酮酯 25 的环化/内酯化以产生四环 26。此外,对合成生物碱的 1H NMR NOE 研究和 X 射线分析已经确定吲哚里西啶部分是反式融合的。