The present invention relates to a process for preparing difluoromethyl-substituted pyrazol-4-ylcarboxylic acids and their esters, 2-(aminomethylidene)-4,4-difluoro-3-oxobutteric esters of the formula (I)
in which R1, R2 and R3 independently of one another are C1-C6-alkyl, C1-C6-haloalkyl, C2-C6-alkenyl, C3-C10-cycloalkyl or benzyl or NR2R3 is a 5- to 10-membered heterocyclic radical, to a process for preparing compounds of the formula (I) wherein an appropriate 3-aminoacrylic ester is reacted with difluoroacetyl fluoride and to the use of compounds of the formula (I) in the process for preparing difluoromethyl-substituted pyrazol-4-ylcarboxylic acids and their esters.
本发明涉及一种制备二
氟甲基取代的
吡唑-4-基
羧酸及其酯,公式(I)中的2-(
氨甲基亚)-4,4-二
氟-3-酮
丁酸酯的方法,其中R1,R2和R3独立地为C1-C6烷基,C1-C6卤代烷基,C2-C6烯基,C3-C10环烷基或苄基,或NR2R3为5-至10-成员的杂环基,制备公式(I)化合物的方法是将适当的3-
氨基
丙烯酸酯与
二氟乙酰氟反应,本发明还涉及在制备二
氟甲基取代的
吡唑-4-基
羧酸及其酯的过程中使用公式(I)化合物的用途。