New Versatile Route to the Synthesis of Tetrahydro-β-carbolines and Tetrahydro-pyrano[3,4-<i>b</i>]indoles via an Intramolecular Michael Addition Catalyzed by InBr<sub>3</sub>
作者:Marianna Agnusdei、Marco Bandini、Alfonso Melloni、Achille Umani-Ronchi
DOI:10.1021/jo034466m
日期:2003.9.1
A simple multistep synthetic strategy to 4-substituted 1,2,3,4-tetrahydro-beta-carboline and 1,3,4,9-tetrahydro-pyrano[3,4-b]indole derivatives starting from commercially available indole 2-carboxylic acid (5) is described. The final intramolecular Michael addition promoted by catalytic amount of InBr(3) (5-10 mol %) provided the expected polycyclic compounds in excellent yields (up to 97%) both in
一种简单的多步合成策略,从市售的吲哚2开始,对4-取代的1,2,3,4-四氢-β-咔啉和1,3,4,9-四氢-吡喃并[3,4-b]吲哚衍生物进行合成。描述了羧酸(5)。在无水有机介质和水性介质中,催化量的InBr(3)(5-10 mol%)促进的最终分子内迈克尔加成反应提供了预期的多环化合物,具有优异的收率(最高97%)。