Process for preparing 2-(aminomethylidene)-4,4-difluoro-3-oxobutyric esters
申请人:BASF SE
公开号:US08314233B2
公开(公告)日:2012-11-20
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.
PROCESS FOR PREPARING 2-(AMINOMETHYLIDENE)-4,4-DIFLUORO-3-OXOBUTYRIC ESTERS
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.