New Route of BenzyneCyclization for Synthesis of 2,3,4,5-Tetrahydro-1H-pyrido[4,3-b]indole Derivatives Avoiding Highly Toxic Aryl Hydrazines
作者:Lucia Kovacikova、Milan Stefek
DOI:10.1002/jhet.2150
日期:2014.9
A new route for the regioselective synthesis of 2,3,4,5‐tetrahydro‐1H‐pyrido[4,3‐b]indole derivatives was developed based on cyclization of 3‐chlorophenylimine‐N‐alkyl‐4‐piperidones by “the complex bases” of NaNH2 or KNH2. The procedure was performed under variable reaction conditions in inert proton‐free solvents, such as THF, dioxane, 1,2‐dimethoxyethane, toluene, and xylene, at temperatures varying
基于3-氯苯基亚胺-N-烷基-4-哌啶酮的环化作用,开发了一种新的区域选择性合成2,3,4,5-四氢-1H-吡啶并[4,3-b]吲哚衍生物的新途径。 NaNH 2或KNH 2的“复杂碱基” 。该程序是在可变的反应条件下,在惰性无质子溶剂(例如THF,二恶烷,1,2-二甲氧基乙烷,甲苯和二甲苯)中,在20°C至所用溶剂的沸点之间变化的温度下进行的。避免了在经典的Fischer吲哚合成中出现的有毒芳基肼中间体。