Synthesis of 4-acyl- and 4-alkoxy-carbonylpyrazoles
Abstract
N′-Aroyl- or N′-acetyl, N′-phenyl- or N′-methyl-hydrazino-derivatives (1) of 1,3-dicarbonyl compounds can be converted by mild base treatment into 5-aryl- or 5-methyl-, 1-phenyl- or 1-methylpyrazoles carrying an acyl or alkoxycarbonyl group at C-4.