An unexpected ring opening–ring closure reaction of 5-azido-4-formylpyrazole
Abstract
5-Chloro-4-formyl-1-methylpyrazoles give 1-azidomethyl-4-cyanopyrazoles on reaction with an excess of sodium azide in dimethyl sulphoxide (DMSO), as a result of a ring opening–ring closure reaction; the crystal structure of the azidomethylpyrazole has been determined.