One-pot approach to construct benzo[4,5]thieno[3,2-b]indoles, pyrido[3′,2’:4,5]thieno[3,2-b]indoles and pyrazino[2′,3’:4,5]thieno[3,2-b]indoles based on the Fischer indole synthesis
作者:Roman A. Irgashev、Alexander S. Steparuk、Gennady L. Rusinov
DOI:10.1016/j.tet.2020.131723
日期:2020.12
During this study, series of benzo[4,5]thieno[3,2-b]indoles, pyrido[3′,2’:4,5]thieno[3,2-b]indoles and pyrazino[2′,3’:4,5]thieno[3,2-b]indoles were efficiently synthesized from benzo- and pyrido- or pyrazino-fused 3-aminothiophene-2-carboxylates, respectively, using one-pot two-step strategy based on the Fischer indolization reaction. The essence of this synthetic approach is acid-promoted reaction
在这项研究中,苯并[4,5]噻吩并[3,2- b ]吲哚,吡啶并[3',2':4,5]噻吩并[3,2- b ]吲哚和吡嗪并[2',3 ':4,5]噻吩并[3,2- b ]吲哚分别使用基于Fischer的一锅两步策略,分别由苯并吡啶基或吡嗪并稠合的3-氨基噻吩-2-羧酸酯有效合成吲哚化反应。这种合成方法的本质是由相应的环稠合的3-氨基噻吩-2-羧酸酯与芳基肼在原位生成的3-氨基噻吩中间体与酸进行反应,从而生成噻吩-3(2 H)-ones的芳hydr ,然后将它们吲哚化,得到噻吩并[3,2 - b ]吲哚核分子。