Synthesis of ethyl 4,5-disubstituted 2-azido-3-thiophenecarboxylates and use in the synthesis of thieno[3,2-e][1,2,3]triazolo[1,5-a]pyrimidin-5(4H)-ones
作者:Nazariy T. Pokhodylo、Vasyl S. Matiychuk、Mykola D. Obushak
DOI:10.1016/j.tet.2009.01.086
日期:2009.3
New heterocyclic azides, ethyl 2-azido-4-R1-5-R2-3-thiophenecarboxylates, were synthesized by diazotization of 2-aminothiophenes and subsequent treatment with sodium azide. The reactions of these heterocyclic azides with β-ketoesters and activated acetonitriles were studied. The derivatives of thieno[3,2-e][1,2,3]triazolo[1,5-a]pyrimidine, a new ring system, were prepared in high yields via an anionic
通过将2-氨基噻吩重氮化并随后用叠氮化钠处理来合成新的杂环叠氮化物2-叠氮基-4-R 1 -5-R 2 -3-噻吩甲酸乙酯。研究了这些杂环叠氮化物与β-酮酸酯和活化乙腈的反应。噻吩[3,2- e ] [1,2,3]三唑并[1,5- a ]嘧啶的衍生物,一种新的环系,是通过阴离子杂多米诺反应高收率地制备的。