PROCESS FOR PREPARING 3-DIHALOMETHYL-PYRAZOLE-4-CARBOXYLIC ACID DERIVATIVES
申请人:Pazenok Sergi
公开号:US20090326242A1
公开(公告)日:2009-12-31
The invention relates to a process for preparing 3-dihalomethylpyrazole-4-carboxylic acid derivatives of the formula (I) by reacting α-fluoroamines of the formula (III) in the presence of Lewis acids with acrylic acid derivatives of the formula (II) to give vinamidinium salts of the formula (IV) and the subsequent reaction thereof with hydrazines, and to the vinamidinium salts of the formula (IV) themselves.
Process for preparing 3-dihalomethyl-pyrazole-4-carboxylic acid derivatives
申请人:Bayer CropScience AG
公开号:US07939673B2
公开(公告)日:2011-05-10
The invention relates to a process for preparing 3-dihalomethylpyrazole-4-carboxylic acid derivatives of the formula (I) by reacting α-fluoroamines of the formula (III) in the presence of Lewis acids with acrylic acid derivatives of the formula (II) to give vinamidinium salts of the formula (IV) and the subsequent reaction thereof with hydrazines, and to the vinamidinium salts of the formula (IV) themselves.