| abstract |
A process for the preparation of 2-aryl-3-aryl-5-halopyridines of formula (I) wherein R 1 is CH 3, NH 2, NHC (O) CF 3 or NHCH 3; Ar is mono-, di- or trisubstituted phenyl or pyridinyl or an N-oxide thereof; R 2 is F, Cl, Br, I, CN or azide, by condensing a compound of formula (A1) under acidic conditions, optionally in the presence of a non-reactive solvent and in the presence of an ammonium reagent, with a compound of formula (A2). |