rhodium(II)-acetate-catalyzed decomposition of 3-(4-acetoxyphenyl)-1-diazo-4-(pyrrol-1-yl)-2-butanone (5d) gave 6-(4-acetoxyphenyl)-5,6-dihydro-7(8H)-indolizinone (6d) in 82% yield via an intramolecular carbenoid reaction. The latter compound was converted in four steps in 13% overall yield to (±)-ipalbidine (1b).
描述了一种新的
生物碱合成方法。用
乙酸铑(II)催化的3-(4-乙酰氧基苯基)-1-重氮-4-(
吡咯-1-基)-2-
丁酮(5d)分解,得到6-(4-乙酰氧基苯基)-5, 6-二氢-7(8 H)-
吲哚嗪酮(6d)通过分子内类
胡萝卜素反应以82%的产率收率。后者化合物经四个步骤以13%的总收率转化为(±)-依帕立定(1b)。