872057-83-5

Upstream product

• 108-24-7 acetic anhydride 
• 299464-86-1 5-amino-3,4-diphenyl-6-(N-phenyl)carbamoylthieno[2,3-c]pyridazine 
• 128462-42-0 ethyl 5-amino-3,4-diphenylthieno[2,3-c]pyridazine-6-carbohydrazide 
• 112450-34-7 4-cyano-5,6-diphenylpyridazine-3 (2H)-thione 

Downstream Products

• 135127-81-0 2-methyl-8,9-diphenylpyrimido<4',5':4,5>thieno<2,3-c>pyridazin-4(3H)-one 
• 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 
• 850075-66-0 3-amino-2-methyl-3,4-dihydro-4-oxo-8,9-diphenylpyrimido[4',5':4,5]thieno[2,3-c]pyridazine 

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

Synthesis of some new pyrimidothienopyridazines and related heterocycles

5-Amino-3,4-diphenylthieno[2,3-c]pyridazine-6-carbonitrile 2a was reacted with propylene diamine to give tetrahydropyrimidinyl derivative 3. The latter compound (3) underwent certain cyclocondensation reactions to produce pyrimidothienopyridazines 4-6. Al