156489-73-5

Upstream product

• 72553-84-5 4-phenylpyridazino<4,5-d>pyridazine-1(2H)-thione 
• 156489-72-4 1-methylmercapto-4-phenylpyridazino<4,5-d>pyridazine 

Downstream Products

• 156489-75-7 1-(3-pentyn-1-yloxy)-4-phenylpyridazino<4,5-d>pyridazine 
• 156489-77-9 1-(3-butyn-1-ylamino)-4-phenylpyridazino<4,5-d>pyridazine 
• 156489-74-6 1-(3-butyn-1-yloxy)-4-phenylpyridazino<4,5-d>pyridazine 

Relevant academic research and scientific papers

Intramolecular [4+2] cycloaddition reactions of pyridazino-[4,5-d]pyridazines with acetylenic side-chain dienophiles: Synthesis of f-annelated phthalazines

Starting from the thione 1, a series of 1-(alkynyl-X)-4-phenylpyridazino[4,5-d]pyridazines 4-8 (X = O, NH, S) was prepared. Thermally induced intramolecular [4+2] cycloaddition reactions of the ethers 4, 5 and the thioether 8 afforded f-annelated phthalaz