PROCEDURE FOR THE DECARBOXYLATION OF 3,5-BIS(HALOALKYL)-PYRAZOLE-4-CARBOXYLIC ACID DERIVATIVES
申请人:BAYER CROPSCIENCE AG
公开号:US20150225350A1
公开(公告)日:2015-08-13
A new process for the preparation of 3,5-bis(haloalkyl)-pyrazole derivatives of the general formula (I)
is described, resulting from the reaction of 3,5-bis(haloalkyl)-pyrazole-4-carboxylic acid derivatives of the general formula (Ha)
with a copper compound and a base at elevated temperature
wherein
R
1
is selected from H, C
1-12
-alkyl, C
3-8
-cycloalkyl, C
6-18
-aryl, C
7-19
-arylalkyl or C
7-19
-alkylaryl, CH
2
CN, CH
2
CX
3
, CH
2
COOH, CH
2
COO(C
1-12
)-alkyl, and
X is independently of each other F, Cl, Br, I;
R
2
and R
3
are selected independently of each other from C
1
-C
6
-haloalkyl.
本文描述了一种制备通式(I)的3,5-双(卤代烷基)-吡唑衍生物的新工艺,该工艺是通过在升高温度下将通式(Ha)的3,5-双(卤代烷基)-吡唑-4-羧酸衍生物与铜化合物和碱反应而得到的。其中,R1从H、C1-12-烷基、C3-8-环烷基、C6-18-芳基、C7-19-芳基烷基或C7-19-烷基芳基、CH2CN、CH2CX3、CH2COOH、CH2COO(C1-12)-烷基中选择,X独立选择为F、Cl、Br、I;R2和R3独立选择为C1-C6-卤代烷基。