Patent ID: 6894184

Claim:
A process for producing the compound of the formula I where R1 is a) —CF 3 , b) —O—CF 3 , c) —S—CF 3 , d) —OH, e) —NO 2 , f) halogen, g) benzyl h) phenyl, i) —O-phenyl, k) —CN, l) —O-phenyl, monosubstituted or polysubstituted with 1) (C 1 -C 4 )-alkyl, 2) halogen, 3) —O—CF 3 or 4) —O—CH 3 , and R2 is a) (C 1 -C 4 )-alkyl, b) halogen or c) a hydrogen atom, which comprises reacting a compound of the formula II, where R1 and R2 are as defined above, in the presence of at least one base, acetic anhydride and at least one solvent and then isolating the resulting compound of the formula I.