Patent ID: 7994207

Claim:
A process for preparing fluoromethyl-substituted heterocyclic compounds of formula (I) wherein R 1 is hydrogen or fluorine; R 2 is an -[A-O] m —R 3 group in which A is C 2 -C 4 -alkanediyl, R 3 is C 1 -C 4 -alkyl and m is 1 or 2; R 4 is selected from the group consisting of hydrogen, C 1 -C 6 -alkyl, C 1 -C 6 -haloalkyl, C 3 -C 6 -cycloalkyl, C 1 -C 4 -alkoxy-C 1 -C 4 -alkyl, C 1 -C 4 -alkylthio-C 1 -C 4 -alkyl, C 1 -C 4 -haloalkoxy-C 1 -C 4 -alkyl, C 1 -C 6 -alkylcarbonyl, C 1 -C 6 -alkoxycarbonyl, phenyl and benzyl, wherein the latter two radicals may optionally be substituted by any combination of 1, 2 or 3 R y4 radicals selected independently from the group consisting of halogen, cyano, nitro, C 1 -C 4 -alkyl, C 1 -C 4 -haloalkyl, C 1 -C 4 -alkoxy and C 1 -C 4 -haloalkoxy; and wherein a chloromethyl-substituted heterocyclic compound of the general formula (II) in which R 1′ is hydrogen or chlorine and R 2 and R 4 are each as defined above is subjected to conversion in the presence of a fluorinating agent wherein fluoromethyl-substituted heterocyclic compounds are prepared.