Trapping of iminiums by the indole nucleus during catalytic hydrogenation of nitriles: a rapid synthesis of tetrahydro-β-carbolines
作者:Khalid Diker、Michèle Döé de Maindreville、Jean Lévy
DOI:10.1016/0040-4039(95)00293-l
日期:1995.4
Reductive self-condensation of indole acetonitrile upon catalytic hydrogenation over Pd·C in acetic acid yielded 1-(3-indolylmethyl)-1,2,3,4-tetrahydro-β-carboline. Hydrogenating 3,4-dimethoxyphenylacetonitrile failed to give tetrahydropapaverine, but a cross reaction between indole acetonitrile and 3,4-dimethoxyphenylacetonitrile allowed isolation of 1-(3,4-dimethoxybenzyl)-1,2,3,4-tetrahydro-β-carboline
在乙酸中Pd·C催化加氢后,吲哚乙腈的还原自缩合反应生成1-(3-吲哚基甲基)-1,2,3,4-四氢-β-咔啉。氢化3,4-二甲氧基苯基乙腈未能得到四氢罂粟碱,但吲哚乙腈与3,4-二甲氧基苯基乙腈之间的交叉反应可分离出1-(3,4-二甲氧基苄基)-1,2,3,4-四氢-β-咔啉,否则可通过将色胺和3,4-二甲氧基苯基乙腈的混合物催化加氢制得(76%)。除了易于接近育亨宾骨架外,该反应还为四氢-β-咔啉的有用的一般合成方法开辟了道路。