New convenient synthesis of substituted 6,9-dihydropyrido[3′,2′:4,5]thieno[3,2-b]pyridines and 6,9-dihydropyrido[3′,2′:4,5]thieno[3,2-d]pyrimidines
Abstract1,4-Dihydro-3-cyano-2-pyridinethiolates react with 2-bromo-l-(4-bromophenyl)ethylidenemalononitrile or N-cyanochloracetanudine to give 6, 9-dihydropyrido[3′, 2': 4, 5]thieno[3. 2-b]pyridines or 6, 9-dihydropyrido-[3′.2′:4.5Jthieno(3,2-d]pyrimidines, respectively.