作者:Luis Miranda、Luis Polindara-García
DOI:10.1055/s-0031-1289745
日期:2012.4
A practical protocol is presented for the construction of the AB-DE rings present in (19,20)-(E)- and (19,20)-(Z)-alstoscholarine alkaloids from the commercially available glutamic acid 5-methyl ester, employing only a six-step synthetic sequence. The main features include the synthesis of the alkynylindolizinone core and the use of Sonogashira cross-coupling and base-mediated cyclization to afford
提出了一种实用的方案,用于从可商购的谷氨酸5-甲基酯构建(19,20)-(E)-和(19,20)-(Z)-α-二十二碳五烯碱生物碱中存在的AB-DE环,仅采用六步合成序列。主要特征包括炔烃炔多嗪酮核心的合成以及Sonogashira交叉偶联和碱介导的环化的使用,从而在不使用保护基的情况下提供了2-取代的吲哚。 生物碱-吲哚-吡咯-交叉偶联-杂环