Patent ID: 8680286

Claim:
A process for preparing a compound of formula (I) comprising reacting a compound of formula (II) with an amine of formula (III) in the presence of a Brønsted acid, where R 1 is hydrogen, alkyl, or haloalkyl; R 2 is alkyl, haloalkyl, alkenyl, haloalkenyl, alkynyl, cycloalkyl, cycloalkylalkyl, halocycloalkyl, alkyloxyalkyl, halocycloalkylalkyl, aryl or arylalkyl; Z is selected from the chemical moieties —(C═O)OR 3 and —(C═O)NR 1 CH 2 A, in which R 3 is selected from C 1-12 -alkyl, C 3-8 -cycloalkyl, C 2-12 -alkenyl, C 2-12 -alkynyl, C 6-8 -aryl, C 7-19 -arylalkyl or C 7-19 -alkylaryl, each of which may be substituted by one or more radicals selected from —R′, —OR′, —SR′, —NR′ 2 , —SiR′ 3 , —COOR′, —(C═O)R′, —CN and —CONR 2 ′, where R′ is hydrogen or C 1-12 -alkyl; A is pyrid-2-yl or pyrid-4-yl, or is pyrid-3-yl which is optionally 6-substituted by fluorine, chlorine, bromine, methyl, trifluoromethyl or trifluoromethoxy.