Preparation and reactions of cyclic α-monocarbonyl azo-compounds: 1-pyrazolin-3-one derivatives
作者:Wataru Nagata、Susumu Kamata
DOI:10.1039/j39700000540
日期:——
good yield by oxidation of the corresponding pyrazolidin-3-one derivatives (Va) and (Vb) with leadtetra-acetate at low temperature. Reactions of (Ia and b) with various nucleophiles were examined. Hydroxide, alkoxides, alcohols, and amines attack initially at the carbonyl carbon atom; ring cleavage then gives intermediate carbanions (III), which are either protonated to yield propionic and isovaleric