Synthesis of new condensed thieno[2,3-b]pyridines containing pyrimidine and imidazole rings

Article abstract of DOI:10.1007/BF02291811

Two different convenient methods have been developed for the synthesis of condensed thieno[2,3-b]pyridines. The intramolecular cyclization of 3-amino-2-hydrazinocarbonyl-7,7-dimethyl-7,8-dihydo-5H-pyrano[3,4-e]-thieno[2,3- b]pyridine was carried out to give 7,7-dimethyl-2-oxo-1,2,6,7-tetrahydro-9H-pyrano[3′,4′-e]- imidazo[4″,5″:2,3]thieno[5,4-b]pyridine, which is the first representative of a new heterocyclic system. 1997 Plenum Publishing Corporation.