156489-75-7

Upstream product

• 10229-10-4 pent-3-yn-1-ol 
• 156489-73-5 1-methylsulfonyl-4-phenylhydrazino<4,5-d>pyridazine 
• 72553-84-5 4-phenylpyridazino<4,5-d>pyridazine-1(2H)-thione 
• 156489-72-4 1-methylmercapto-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