N-Cyanochloroacetamidine — A convenient reagent for the regioselective synthesis of fused diaminopyrimidines
作者:Vasilii A Artyomov、Lyudmila A Rodinovskaya、Anatolii M Shestopalov、Viktor P Litvinov
DOI:10.1016/0040-4020(95)00935-3
日期:1996.1
enaminocyanamidines form pyrimidine rings under acid or base catalysis forming fused diaminopyrimidines. According to this common scheme, functionally substituted thieno[3,2-d]pyrimidines, thiazolo[4,5-d]pyrimidines, pyrimido[4″,5″:4′,5′]thieno[3′,2′:4,5]thieno[3,2-d]pyrimidine, pyrido[3′,2′4,5]thieno(selenopheno)[3,2-d]pyrimidines, their hydrogenated analogues, and pyrimido-[4′,5′:4,5]thieno[2,3-d]pyrimidine were synthesized
N-氰基氯乙酰胺与共轭的巯基(硒代)腈反应,生成区域选择性S(Se)烷基化产物,该产物随后可参与Thorpe反应。所得的烯氨基氰在酸或碱催化下形成嘧啶环,形成稠合的二氨基嘧啶。根据该通用方案,功能性取代的噻吩并[3,2- d ]嘧啶,噻唑并[4,5- d ]嘧啶,嘧啶并[4“,5”:4',5']噻吩并[3',2': 4,5] thieno [3,2- d ]嘧啶,吡啶基[3',2'4,5] thieno(硒代苯酚)[3,2- d ]嘧啶,它们的氢化类似物和嘧啶-[4',5 ′:4,5]噻吩并[2,3- d ]嘧啶。