HENNIG, LOTHAR;MANN, GERHARD, Z. CHEM., 28,(1988) N 10, C. 364-365
作者:HENNIG, LOTHAR、MANN, GERHARD
DOI:——
日期:——
Spiro-Fused (C2)-Azirino-(C4)-pyrazolones, a New Heterocyclic System. Synthesis, Spectroscopic Studies and X-ray Structure Analysis<sup>1</sup>
作者:Wolfgang Holzer、Rosa M. Claramunt、Marta Pérez-Torralba、Davide Guggi、Thomas H. Brehmer
DOI:10.1021/jo030131t
日期:2003.10.1
Reaction of 1-substituted 4-acyl-5-hydroxy-3-methyl-1H-pyrazoles (2) with hydroxylamine gives the corresponding "oximes" 3, which are mainly present as (Z)-2,4-dihydro-4-[(hydroxyamino)methylene]-3H-pyrazol-3-ones. Treatment of compounds 3 with trichloroacetyl isocyanate/potassium carbonate in anhydrous diethyl ether affords 7-methyl-1,5,6-triazaspiro[2.4]hepta-1,6-dien-4-ones (4). The structure of