| Abstract
| - Reaction of 1-substituted 4-acyl-5-hydroxy-3-methyl-1H-pyrazoles (2) with hydroxylamine gives thecorresponding “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 carbonatein anhydrous diethyl ether affords 7-methyl-1,5,6-triazaspiro[2.4]hepta-1,6-dien-4-ones (4). Thestructure of compounds 4 was elucidated by means of single-crystal X-ray analysis (4f, 4h) andconfirmed by NMR spectroscopic investigations (1H, 13C).
|
