A method for synthesis of polysubstituted 4-difluoromethyl and perfluoroalkyl pyrazoles

A method for the synthesis of polysubstituted 4-difluoromethyl and perfluoroalkyl pyrazole derivatives by the Lewis acid- and base-co-mediated reaction of perfluoroacetyl diazoester with ketones is reported. A series of structurally diverse 4-difluoromethylated and perfluoroalkylated pyrazoles were obtained in moderate to good yields. The reactions proceeded smoothly under mild conditions with wide functional group...