Aldehydo sugars p-nitrophenylhydrazones upon treatment with lead tetraacetate in the presence of an excess of methyl acrylate afforded, besides N’-acetylhydrazide derivatives, methyl 3-glycosyl-1-p-nitrophenylpyrazoline-5-carboxylates which were readily oxidized to the corresponding pyrazoles. The methyl pyrazole-5-carboxylates were converted to 5-carboxamides.