Heterocyclization of Orthoaminoester and Orthoamino-nitrile-thieno[2, 3-<i>c</i>]pyridine: The Facile Synthesis of Fused Pyridothienopyrimidines
作者:E. Kh. Ahmed、M. A. Ameen、F. F. Abdel-latif
DOI:10.1080/10426500500263748
日期:2006.3.1
A highly efficient and versatile synthetic approach to the synthesis of pyrido[4',3':4,5]thieno[2,3-d]pyrimidines (4, 14, 15, 21) and their heterofused (e.g., triazolo-, triazino-, imidazo-, and tetrazolo-) pyridothienopyrimidines (5-9, 16, 17, 22-24) is described utilizing 2-amino-3-cyano-4,5,6,7-tetrahydrothieno[2,3-c]pyridine-6-carboxylic acid ethyl ester (2) and diethyl 2-isothiocyanate-4,5,6,7-tetraltydrotltieno[2,3-c]pyridine-3,6-dicarboxylate (10) as starting materials.