Novel Selected Tandem Transformations of the Amino and Carbonyl/Nitrile Groups in the Gewald Thiophenes
作者:Nazariy T. Pokhodylo、Olga Ya. Shyyka、Roman D. Savka、Mykola D. Obushak
DOI:10.1080/10426500903496739
日期:2010.9.27
henyl)methanone] were synthesized and used in anionic domino reactions with activated acetonitriles to yield thieno[3,2-e][1,2,3]triazolo[1,5-a]pyrimidines and/or 2-(5-amino-1H-1,2,3-triazol-1-yl)thiophenes. Finally, a new ring system of thieno[3,2-e]pyrazolo[1,5-a]pyrimidine was synthesized via a domino reaction of ethyl 2-[(2Z)-2-(1-chloro-2-ethoxy-2-oxoethylidene)hydrazino]-4,5,6,7-tetrahydro-1
为了合成噻吩并嘧啶,研究了 Gewald 噻吩中氨基和羰基/腈基团的新转化。发现 2-氨基-噻吩-3-甲酰胺和 2-(乙酰氨基)-4,5,6,7-四氢-1-苯并噻吩-3-羧酸乙酯不产生四唑衍生物,在反应中也不与原甲酸三乙酯和叠氮化钠反应,也不与三氯氧磷和叠氮化钠反应。相反,thieno[2,3-d]pyrimidin-4(3H)-one 和 thieno[2,3-d][1,3]oxazin-4-one 的衍生物被分离出来。新的 2-azidothiophenes [2-azido-4,5,6,7-tetrahydro-1-benzothiophene-3-carbonitrile 和 2-azido-4,5,6,7-tetrahydro-1-benzothiophen-3-yl(苯基)甲酮]被合成并用于与活化乙腈的阴离子多米诺反应以产生噻吩并[3,2-e][1,2,3]三唑并[1, 5-a]嘧啶和/或2-(5-氨基-1H-1