Patent ID: 8501748

Claim:
A process for preparing a compound of the formula IV in which R 1 is C 2 -C 12 -alkyl, C 2 -C 12 -alkenyl, C 2 -C 12 -alkynyl, C 3 -C 8 -cycloalkyl, C 3 -C 8 -cycloalkyl-C 1 -C 4 -alkyl, phenyl-C 1 -C 4 -alkyl, phenoxy-C 1 -C 4 -alkyl or benzyloxy-C 1 -C 4 -alkyl, where C 2 -C 12 -alkyl may be substituted by one of the radicals R A , the C 3 -C 8 -cycloalkyl groups in the radicals mentioned above may be substituted by 1, 2, 3, 4 or 5 radicals R B and the phenyl groups in the radicals mentioned above may be substituted by 1, 2, 3, 4 or 5 radicals R C ; R A is selected from the group consisting of C 1 -C 10 -alkoxy, C 1 -C 6 -alkoxy-C 1 -C 4 -alkoxy, C 1 -C 10 -alkylthio, NH 2 , C 1 -C 10 -alkylamino and di-C 1 -C 10 -alkylamino; R B is selected from the group consisting of fluorine, C 1 -C 4 -alkyl, C 1 -C 4 -perfluoroalkyl and the meanings given for R A ; R C is selected from the group consisting of fluorine, nitro, C 1 -C 4 -alkyl, C 1 -C 4 -perfluoralkyl and the meanings given for R A , where R 1 has at least 3 carbon atoms R 2 is C 1 -C 8 -alkyl; R 4 is hydrogen, NH 2 or C 1 -C 6 -alkyl and X is N or a group C—R 5 , where R 5 is hydrogen or C 1 -C 6 -alkyl; which comprises: a) preparing a compound of general formula I in which R 1 and R 2 have one of the meanings mentioned above, and b) reacting the compound of general formula (I) with a compound of the formula V or a tautomer thereof, in a known manner, giving the compound of the formula IV.