850075-66-0

Upstream product

• 94011-79-7 3-chloro-5,6-diphenylpyridazine-4-carbonitrile 
• 128462-42-0 ethyl 5-amino-3,4-diphenylthieno[2,3-c]pyridazine-6-carbohydrazide 
• 872057-83-5 2-methyl-8,9-diphenyl-4H-pyridazino[4',3':4,5]thieno[3,2-d]-1,3-oxazin-4-one 
• 850075-65-9 ethyl 5-acetylamino-3,4-diphenylthieno[2,3-c]pyridazine-6-carboxylate 

Downstream Products

• 911110-98-0 N-(6-methyl-8-oxo-3,4-diphenyl-7,8-dihydropyrimido[4',5':4,5]thieno[2,3-c]pyridazin-7-yl)thiourea 
• 135127-81-0 2-methyl-8,9-diphenylpyrimido<4',5':4,5>thieno<2,3-c>pyridazin-4(3H)-one 

Relevant academic research and scientific papers

Pyridazine derivatives and related compounds, part 21: Synthesis of different heterocycles from 2-methyl-4H-pyridazino[4′,3′:4,5] thieno[3,2-d]-1,3-oxazin-4-one

Starting with ethyl 5-amino-3,4-diphenylthieno[2,3-c]pyridazine-6-carboxyl- ate, the syntheses of 2-methyl-8,9-diphenyl-4H-pyridazino[4′,3′:4,5] thieno[3,2-d]-1,3-oxazin-4-one (1), 7-amino-6-methyl-8-oxo-3,4-diphenyl-7,8- dihydropyrimido-[4′,5′:4,5]thieno

Pyridazine derivatives and related compounds. Part 11: 1Synthesis of some pyrimido[4′,5′:4,5]thieno[2,3-c] pyridazines

3-Substituted pyrimido[4′,5′:4,5]thieno[2,3-c/pyridazine-2,4- di-ones and 3-amino-2-methylpyrimido[4′,5′:4,5]thieno[2,3-c] pyridazine-4-ones were synthesized starting from ethyl 5-aminothieno[2,3-c] pyridazine-6-carboxylate 1. Reaction of amino ester 1 with phenyl isothiocyanate affords thiourea derivative 10 which undergo further transformation to the related fused heterocyclic systems.