2,6-Diarylhexahydro-4-pyridazinols by acid-catalyzed cyclization of benzaldehyde aryl-2-(2-propenyl)hydrazones
作者:Rajagopal Bakthavatchalam、Engelbert Ciganek、Joseph C. Calabrese
DOI:10.1002/jhet.5570330137
日期:1996.1
Treatment of benzaldehyde l-(2-propenyl)-4-methylsulfonylphenylhydrazone (1f) with 45% sulfuric acid gave 2-(4-methylsulfonylphenyl)-6-phenylhexahydro-4-pyridazinol (2f) in 35% yield rather than the expected 1-(4-methylsulfonylphenyl)-1-(2-propenyl)hydrazine. The halogen-substituted hydrazones 1c-1e and benzaldehyde 1-(2-methyl-2-propenyl)phenylhydrazone (1b) gave similar results.
用45%硫酸处理苯甲醛1-(2-丙烯基)-4-甲基磺酰基苯基hydr(1f)得到2-(4-甲基磺酰基苯基)-6-苯基六氢-4-吡嗪醇(2f),产率为35%,而不是预期的1 -(4-甲基磺酰基苯基)-1-(2-丙烯基)肼。卤素取代的azo1c -1e和苯甲醛1-(2-甲基-2-丙烯基)苯基hydr(1b)得到相似的结果。