The synthesis of a novel series of 4-arylhydrazono-5-methyl-1, 2-dihydropyrazol-3-ones 4a– h, and their N 2-alkyl and acyclo, glucopyranosyl, and ribofuranosyl derivatives is described. K2CO3 catalyzed alkylation of 4a–h with allyl bromide, propargyl bromide, 4-bromobutyl ...