Studies with Heterocyclic β-Enaminoniriles: A Simple Route for the Synthesis of Polyfunctionally Substituted Thiophene, Imidazo[1,2:1′,6′]pyrimido[5,4-b]thiophene and Thieno[3,2-d]pyrimidine Derivatives
作者:M. A. Raslan、S. M. Sayed
DOI:10.1002/jccs.200300128
日期:2003.8
Reaction of 3,5-diaminothiophene-2-carbonitrile derivatives 3a-c with ethoxycarbonylmethyl isothiocyanate and/or N-[bis(methylthio)methylene]glycine ethyl ester led to formation of 7-substituted-8-amino-5-thioxo-6H-imidazo[1,2:1',6']pyrimido[5,4-b]thiophene-2(3H)-one derivatives 6a-c and 7-substituted-8-amino-5-(methylthio)imidazo[1,2:1',6']pyrimido[5,4-b]thiophene-2(3H)-one 7a-c, respectively. Also
3,5-二氨基噻吩-2-甲腈衍生物 3a-c 与乙氧基羰基甲基异硫氰酸酯和/或 N-[双(甲硫基)亚甲基]甘氨酸乙酯反应生成 7-取代-8-氨基-5-硫代-6H -咪唑并[1,2:1',6']嘧啶并[5,4-b]噻吩-2(3H)-one衍生物6a-c和7-取代-8-氨基-5-(甲硫基)咪唑[1 ,2:1',6']嘧啶并[5,4-b]噻吩-2(3H)-one 7a-c,分别。此外,还探索了 3a-c 中 β-烯氨基腈部分的合成潜力;它被证明是合成1,6-二取代-2,4-二氨基-7,8-二氢-8-氧代吡咯并[1,2-a]噻吩并[2,3-e]嘧啶衍生物10a的有希望的候选物-f 和吡啶并[2',3':6,5]嘧啶并[3,4-a]苯并咪唑衍生物 12a,b。