PROCESS FOR THE PREPARATION OF BENZIMIDAZOLES

摘要

The invention provides a process for the preparation of compounds of formula (I), wherein wherein R1 is C1-6-alkyl or C3-6-cycloalkyl, R2 is selected from the group consisting of hydrogen, C1-6-alkyl and C3-6-cycloalkyl, and Q1 is selected from the group consisting of halogen, cyano and -CO-R3, wherein R3 is selected from hydrogen, hydroxy, C1-6-alkoxy, C3-8-cycloalkyloxy, aryloxy, C1-6-alkylamino, aryl-(C1-6-alkyl)amino and di-C1-6-alkylamino, comprising the step of reacting a corresponding o-nitroaniline with an aldehyde R2-CHO or an equivalent thereof in the presence of a reducing agent.