An effective procedure for the preparation of 3-substituted-4- or 6-azaindoles from ortho-methyl nitro pyridines
作者:Juliang Zhu、Henry Wong、Zhongxing Zhang、Zhiwei Yin、Nicholas A. Meanwell、John F. Kadow、Tao Wang
DOI:10.1016/j.tetlet.2006.06.017
日期:2006.8
3-Substituted-4- and 6-azaindoles were prepared from ortho-methyl-nitropyridines in a practically convenient, one-pot process based on the Leimgruber–Batcho reaction. The procedure comprises a sequence of (a) condensation of an ortho-methyl-nitropyridine with N,N-dimethylformamide dimethyl acetal; (b) alkylation or acylation of the enamine intermediate; (c) reduction of the nitro group to an aniline with in situ
在Leimgruber-Batcho反应的基础上,通过实用的一锅法,由邻甲基-硝基吡啶制备3-取代的4-和6-氮杂吲哚。该方法包括以下步骤:(a)将邻甲基-硝基吡啶与N,N-二甲基甲酰胺二甲基乙缩醛缩合;(b)烯胺中间体的烷基化或酰化;(c)通过原位环化将硝基还原为苯胺并消除二甲胺以产生3-取代的氮杂吲哚杂环。