| abstract |
The invention provides a process for the preparation of compounds of formula (I) wherein wherein R 1 is C 1-6 -alkyl or C 3-6 -cycloalkyl, R 2 is selected from the group consisting of hydrogen, C 1-6 -alkyl and C 3-6 -cycloalkyl, and Q 1 is selected from the group consisting of halogen, cyano and -CO-R 3 , wherein R 3 is selected from hydrogen, hydroxy, C 1-6 -alkoxy, C 3-8 -cycloalkyloxy, aryloxy, C 1-6 -alkylamino, aryl-(C 1-6 -alkyl)amino and di-C 1-6 -alkylamino, comprising the step of reacting a corresponding o -nitroaniline with an aldehyde R 2 -CH0 or an equivalent thereof in the presence of a reducing agent. |