New convenient synthesis of 2,3-diaminothieno[2,3-d]pyrimidin-4(3H)-one derivates from substituted alkyl 2-(1H-tetrazol-1-yl)thiophene-3-carboxylates
作者:Nazariy T. Pokhodylo、Vasyl S. Matiychuk、Mykola D. Obushak
DOI:10.1016/j.tet.2007.11.045
日期:2008.2
4,5-Disubstituted and 4-substituted alkyl 2-amino-thiophene-3-carboxylates react with triethyl orthoformate and sodium azide in acetic acid to yield new 2-(1H-tetrazol-1-yl)-4-R1-5-R2-thiophene derivates. It was established that the reaction of these tetrazoles with hydrazine generates the insufficiently studied 2,3-diaminothieno[2,3-d]pyrimidin-4(3H)-one system. It is significant that the reaction
4,5-二取代和4-取代的烷基的2-氨基噻吩-3-羧酸酯与原甲酸三乙酯和叠氮化钠在乙酸,得到2-新反应(1 ħ -四唑-1-基)-4-R 1 - 5-R 2-噻吩衍生物。已经确定这些四唑与肼的反应产生了研究不足的2,3-二氨基噻吩并[2,3- d ]嘧啶-4(3H)-一系统。重要的是,上述反应是在肼作用下独特的四唑环裂解。