Synthesis of Indolo- and Benzothieno[2,3-<i>b</i>]quinolines by a Cascade Cyclization of <i>o</i>-Alkynylisocyanobenzene Derivatives
作者:Onnicha Khaikate、Natthamon Inthalaeng、Jatuporn Meesin、Kritchasorn Kantarod、Manat Pohmakotr、Vichai Reutrakul、Darunee Soorukram、Pawaret Leowanawat、Chutima Kuhakarn
DOI:10.1021/acs.joc.9b02081
日期:2019.12.6
A new synthetic approach for the synthesis of indolo[2,3-b]quinolines and benzothieno[2,3-b]quinolines has been developed by employing the freshly prepared o-alkynylisocyanobenzenes derived from o-alkynylformamide derivatives as substrates. The synthetic transformations involved chloride-ion-triggered 6-endo cyclization of o-alkynylisocyanobenzenes to generate 2-chloroquinolines in situ, which further
通过使用新鲜制备的衍生自邻炔基甲酰胺衍生物的邻炔基异氰基苯,开发了一种新的合成方法,用于合成吲哚并[2,3-b]喹啉和苯并噻吩并[2,3-b]喹啉。合成转化涉及氯-离子触发的邻炔基异氰基苯的6-内酯环化反应,以原位生成2-氯喹啉,然后通过级联过程与氮或硫原子分子内环化,从而提供相应的吲哚[2,3-b]喹啉和苯并噻吩并[2,3-b]喹啉分别以中等至优异的产率。