Patent ID: 8791260

Claim:
A process for the preparation of compounds of general formula (III) optionally in the form of a tautomer or acid addition salt thereof, characterised in that the process comprises reaction step (C), wherein (C) is the reaction of a tertiary alcohol selected from tert-butanol, 2-methyl-2-butanol, 2-methyl-2-pentanol, 2-methyl-2-hexanol, 2,3-dimethyl-2-butanol or 2,4-dimethyl-2-pentanol; and 5-methyl-1,2-oxazole in the presence of an acid of formula XH and a compound of formula (V) R 1 —COOH (V) without isolation of a compound of formula (II) to form a compound of formula (III) wherein XH denotes an acid selected from among HPF 6 , HBF 4 , HSbF 6 , phenylsulphonic acid, p-toluenesulphonic acid, H 2 SO 4 , (H 2 SO 4 )/2, F 3 CCOOH, FSO 3 H, or F 3 CSO 3 H; R 1 denotes a group of formula (i), wherein A 1 and A 2 independently from each other denote N or CH; R 1.1 denotes a group selected from among hydrogen, chloro, bromo or methyl, R 1.2 denotes a group selected from among hydrogen, amino, C 1-3 -alkyl-NH—, (C 1-3 -alkyl) 2 N— or methyl, or R 1.1 and R 1.2 together form an annelated benzo ring; and R t denotes C 1-4 -alkyl.