Synthesis of New Pyridazino[4′,3′:4,5]-thieno[3,2-d]-1,2,3-triazine and Pyrimido [4′,5′:4,5]thieno[2,3-c]pyridazine Derivatives

Article abstract of DOI:10.1007/BF00807576

8,9-Diphenylpyridazino[4′,3′:4,5]thieno[3,2-d]-1,2,3-triazin- 4(3H)-one (2), 3-substituted 8,9-diphenylpyridazino[4′,3′:4,5]thieno[3,2-d]-1,2,3-triazin-4(3H)- ones (3a-c), 3,4-diphenylpyrimido-[4′,5′:4,5]thieno[2,3-c]pyridazin-8(7H)-one (4), 8-chloro-3,4-diphenylpyrimido[4′,5′:4,5]thieno[2,3-c]pyridazine (5), 8-substituted 3,4-diphenylpyrimido[4′,5′:4,5]thieno[2,3-c]pyridazines (6a-h) and 7-substituted 3,4-diphenylpyrimido[4′,5′:4,5]thieno[2,3-c]pyridazin-8(7H)-ones(7a- c) were synthesized from 5-amino-3,4-diphenylthieno[2,3-c]pyridazine-6-carboxamide (1).