Patent ID: 7906677

Claim:
A process for the production of a compound of Formula I or a pharmaceutically acceptable salt thereof, wherein R is methyl or ethyl; R 1 is chloro or fluoro; R 2 is hydrogen or fluoro; R 3 is hydrogen, fluoro, chloro, methyl, ethyl, methoxy, ethoxy or hydroxy; R 4 is hydrogen or fluoro; and R 5 is chloro, fluoro, trifluoromethyl or methyl, provided that R 1 , R 2 , R 4 and R 5 are not all fluoro when R is ethyl and R 3 is H; comprising: a) rearrangement and hydrolysis of a compound of formula IX to produce a compound of formula VIII; b) transforming the compound of formula VIII into the compound of formula I.