Method of producing 1-alkyl-3-aryl-5-difluoromethoxy-1H-pyrazoles

摘要

The invention relates to a method of preparing 1-alkyl-3-aryl-5-difluoromethoxy-1H-pyrazoles of the formula (I), wherein aryl represents a mono- or polysubstituted phenyl ring, and R¹ represents C₁-C₄ alkyl. The inventive method is characterized by reacting, in a first reaction step, a beta-ketoester of the general formula (II) with hydrazine and by successively reacting the reaction product obtained with chlorodifluoromethane and a compound R¹-L, wherein R¹ has the meanings indicated above and L represents the leaving group of a nucleophilic displacement reaction.