The invention relates to a method of Aryl preparing 1-alkyl-3-aryl-5-difluoromethoxy-1H-pyrazoles of the formula (I), wherein aryl represents a mono- or polysubstituted phenyl ring, and R
1
represents C
1
-C
4
alkyl. The inventive method is characterized by reacting, in a first reaction step, a &bgr;-ketoester of the general formula (II) with hydrazine and by successively reacting the reaction product obtained with chlorodifluoromethane and a compound R
1
-L, wherein R
1
has the meanings indicated above and L represents the leaving group of a nucleophilic displacement reaction.
1
本发明涉及一种制备式(I)的1-烷基-3-芳基-5-二
氟甲
氧基-1H-
吡唑的芳基方法,其中芳基表示单取代或多取代的
苯环,R1表示C1-C4烷基。本发明的方法的特征在于,在第一反应步骤中,将通式(II)的β-
酮酯与
肼反应,然后将所得的反应产物依次与
氯二氟甲烷和化合物R1-L反应,其中R1具有上述所示的含义,L表示亲核置换反应的离去基。