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。