Thermal cyclization of 3-benzyl-2,2-dimethylpenta-3,4-dienal hydrazone derivatives leading to the formation of 5-benzyl-4,4,6-trimethyl-1,4-dihydropyridazines is reported.
2,2-Dimethylpenta-3,4-dienal derivatives: Preparation, NMR spectra, and crystal structure
摘要:
The preparation of some new 2,2-dimethylpenta-3,4-dienal derivative's starting by Claisen-Cope rearrangement of the pyrolytic product of the corresponding acetales and followed by condensation reactions is described. The synthesis of homoallenylketone 5 from homoallenylaldehyde 3 by Grignard reaction and followed by the oxidation of the formed alcohol using potassium chlorochromate (KCC) is reported. All new compounds are characterized by IR, MS, H-1, and C-13 NMR spectroscopy. The full assignment of the NMR signals is based on HETCOR and FLOCK pulse sequences. The molecular and crystal structure of 2,2-dimethylhexa-3,4-dienal 2,4-dinitrophenylhydrazone is presented.
Novel tandem cyclization-oxidation reaction of 2,2-dimethylpenta-3,4-dienal hydrazones
作者:Radek Marek、Milan Potáček、Jaromír Marek、Alex De Groot
DOI:10.1016/0040-4039(94)85039-9
日期:1994.9
Synthesis of 3-substituted 2,2-dimethyl-penta-3,4-dienal hydrazones, their cyclization and following easy oxidation is reported. Reaction appears to be a new synthetic pathway for preparation of substituted 2,3,4,5-tetrahydropyridazin-3-ones.
Marek, Radek; St'astna-Sedlackova, Irena; Tousek, Jaromir, Bulletin des Societes Chimiques Belges, 1997, vol. 106, # 11, p. 645 - 650
作者:Marek, Radek、St'astna-Sedlackova, Irena、Tousek, Jaromir、Marek, Jaromir、Potacek, Milan
DOI:——
日期:——
Novel thermal tetracyclization by intramolecular azine “criss-cross” addition
作者:Milan Potáček、Radek Marek、Zdirad Žák、Julie Trottier、Zdeněk Janoušek、Heinz G. Viehe
DOI:10.1016/s0040-4039(00)61426-0
日期:1993.12
An easy, thermally initiated reaction of homoallenylazine 1 affords the new fused heterocyclic system 2 consisting of four five-membered rings in ten-membered carbocycle around the hydrazine moiety.