Process for the preparation of heteroarylcarboxylic amides and esters
申请人:BASF AKTIENGESELLSCHAFT
公开号:EP0899262B1
公开(公告)日:2005-04-06
PROCESS FOR THE PREPARATION OF PYRIDYLCARBOXYLIC AMIDES AND ESTERS
申请人:BASF SE
公开号:EP1948609B1
公开(公告)日:2010-03-10
Process for the Preparation of Pyridylcarboxylic Amides and Esters
申请人:Brink Monika
公开号:US20080249313A1
公开(公告)日:2008-10-09
The invention relates to a process for the preparation of pyridylcarboxylic amides and esters I, Formula (I) wherein Hal, X and R
1
have the meanings given in claim
1
, which comprises the following steps: (a) heating a mixture consisting essentially of trichloromethylpyridine II, Formula (II), wherein Hal has the meaning given, and 1.0 to 1.5 equivalents of concentrated sulfuric acid, characterized in that the trichloromethylpyridine II in a liquid form is added to the concentrated sulfuric acid at a temperature from 110° C. to 160° C.; and (b) reacting the intermediate product obtained in step (a) with an amine or alcohol III, HXR
1
, wherein X and R
1
have the meaning given, optionally in the presence of a solvent and/or a base.