R. Marek et al., NOVEL TANDEM CYCLIZATION-OXIDATION REACTION OF 2,2-DIMETHYLPENTA-3,4-DIENAL HYDRAZONES, Tetrahedron letters, 35(37), 1994, pp. 6909-6912
Synthesis of 3-substituted 2,2-dimethyl-penta-3,4-dienal hydrazones, t
heir cyclization and following easy oxidation is reported. Reaction ap
pears to be a new synthetic pathway for preparation of substituted 2,3
,4,5-tetrahydro-pyridazin-3-ones.