Patent ID: 7893273

Claim:
A process for the preparation of a compound having the following general formula (I), wherein R 1 is selected from the group consisting of C 1 -C 8 alkyl, C 3 -C 8 cycloalkyl and C 6 -C 10 aryl, optionally substituted by a substituent selected from the group consisting of C 1 -C 8 alkyl, C 6 -C 10 aryl, C 1 -C 8 alkoxy and C 6 -C 10 aryloxy; and R 2 and R 3 , each independently, represent hydrogen or chlorine, comprising: reacting a compound having the following general formula (II), wherein R 1 is as previously defined, or a compound having the following general formula (III), wherein R 1 is as previously defined, with sulfuryl chloride in the absence of a solvent.