申请人:Zierke Thomas
公开号:US20110046371A1
公开(公告)日:2011-02-24
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 R
1
, R
2
and R
3
independently of one another are C
1
-C
6
-alkyl, C
1
-C
6
-haloalkyl, C
2
-C
6
-alkenyl, C
3
-C
10
-cycloalkyl or benzyl or NR
2
R
3
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-基羧酸及其酯类,公式(I)中的2-(氨甲基亚甲基)-4,4-二氟-3-酮基丁酸酯,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,或者NR2R3是一个5-至10-成员的杂环基,本发明还涉及一种制备公式(I)化合物的方法,其中适当的3-氨基丙烯酸酯与二氟乙酰氟反应,以及在制备二氟甲基取代的吡唑-4-基羧酸及其酯类的过程中使用公式(I)化合物的用途。