Iminophosphoranes in heterocyclic chemistry. A simple one-pot synthesis of pyridothienopyridazines and pyrimidothienopyridazines
作者:Rafael Alvarez-Sarandés、Carlos Peinador、José M Quintela
DOI:10.1016/s0040-4020(01)00460-4
日期:2001.6
Iminophosphoranes, 6-(2-ethoxycarbonylvinyl)-3,4-diphenyl-5-[(triphenylphosphoranylidene)amino]thieno[2,3-c]pyridazine la, 6-(2-cyanovinyl)-3,4-diphenyl-5-[(triphenylphosphoranylidene)amino]thieno [2,3-c]pyridazine Ib, and 6-(4-aryliminomethylene)-3,4-diphenyl-5-[(triphenylphosphoranylidene)amino]thieno[2,3-c] pyridazine 5a-c react with heterocumulenes such as iso(thio)cyanates, carbon dioxide and carbon disulfide to give directly the title compounds in an aza-Wittig/electrocyclic-ring closure process. The N-heteroaryliminophosphoranes 8a,b underwent an unusual pyridine ring closure under Vilsmeier conditions to form the pyridothienopyridazines 10a,b. (C) 2001 Elsevier Science Ltd. All rights reserved.