2-Bromo-1-arylethylidenemalononitriles — Convenient reagents for the regioselective synthesis of fused pyridines
作者:Vasilii A. Artyomov、Vladimir L. Ivanov、Anatolii M. Shestopalov、Victor P. Litvinov
DOI:10.1016/s0040-4020(97)00847-8
日期:1997.9
subsequently involved in the Thorpe reaction. Resulting enaminoacrylonitriles form pyridine ring under base catalysis yielding thienodipyridines. According to this common scheme, functionally substituted thieno[3,2-b]pyridines, thiazolo[4,5-b]pyridines, thieno[3,2-b:4,5-b]dipyridines, their hydrogenated analogues, and pyrido[2′,3′:4,5]thieno[2,3-d]pyrimidine were synthesized.
2-溴-1-芳基乙叉基丙二腈与共轭硫代乙腈反应生成区域选择性S烷基化产物,该产物随后可参与Thorpe反应。所得的烯氨基丙烯腈在碱催化下形成吡啶环,产生噻吩并吡啶。根据该通用方案,功能上取代的噻吩并[3,2- b ]吡啶,噻唑并[4,5- b ]吡啶,噻吩并[3,2- b:4,5- b ]二吡啶,它们的氢化类似物和吡啶基合成了[2',3':4,5]噻吩并[2,3- d ]嘧啶。