[EN] PROCESS FOR PREPARING 3-FLUOROALKYL-5-PYRAZOLECARBOXYLATES AND 3-FLUOROALKYL-5-PYRAZOLECARBOXYLIC ACIDS<br/>[FR] PROCÉDÉ DE PRÉPARATION DE 3-FLUOROALKYL-5-PYRAZOLECARBOXYLATES ET D'ACIDES 3-FLUOROALKYL-5-PYRAZOLECARBOXYLIQUE
申请人:BAYER CROPSCIENCE AG
公开号:WO2018054807A1
公开(公告)日:2018-03-29
The present invention relates to a novel process for preparing 3-fluoroalkyl-5-pyrazolecarboxylates from ketimines and oxalic acid derivatives which can be further transformed into 3-fluoroalkyl-5- pyrazolecarboxylic acids.
Process for preparing 3-fluoroalkyl-5-pyrazolecarboxylates and 3-fluoroalkyl-5-pyrazolecarboxylic acids
申请人:BAYER CROPSCIENCE AKTIENGESELLSCHAFT
公开号:US10556867B2
公开(公告)日:2020-02-11
The present invention relates to a novel process for preparing 3-fluoroalkyl-5-pyrazolecarboxylates from ketimines and oxalic acid derivatives which can be further transformed into 3-fluoroalkyl-5-pyrazolecarboxylic acids.
PROCESS FOR PREPARING 3-FLUOROALKYL-5-PYRAZOLECARBOXYLATES AND 3-FLUOROALKYL-5-PYRAZOLECARBOXYLIC ACIDS
申请人:Bayer CropScience Aktiengesellschaft
公开号:EP3515893A1
公开(公告)日:2019-07-31
New synthetic access to 3-fluoroalkyl-5-pyrazolecarboxylates and carboxylic acids
作者:Alberto Gómez Herrera、Etienne Schmitt、Armen Panossian、Jean-Pierre Vors、Sergii Pazenok、Frédéric R. Leroux
DOI:10.1016/j.jfluchem.2018.07.010
日期:2018.10
A novel process for preparing 3-fluoroalkyl-5-pyrazolecarboxylates and carboxylicacids is hereby presented. Easily accesible α-fluorinated ketimines were condensed with oxalyl monochloride derivatives, and the obtained vinamides underwent acid-catalyzed cyclization with substituted hydrazines. This highly efficient protocol can also be used for non-fluorinated C-3 and C-5 substituents.