1: 4-fluoro-2-trifluoromethylbenzoic acid With oxalyl dichloride; N,N-dimethyl-formamide in dichloromethane Heating / reflux; 2: methanol in dichloromethane 2 h;

in N-methyl-acetamide; methanol

in methanol; diethyl ether; chloroform 2 h;