To 4-((3,4-dichlorophenoxy)methyl)-2,5-difluorobenzamide (Preparation 24, 60 mg, 0.18 mmol) in THF (2 mL) was added a THF solution of lithium hexamethyldisilazide (1 M, 0.362 mL, 0.362 mmol) over 2 minutes. After stirring for 15-20 minutes, methanesulphonyl chloride (0.028 mL, 0.362 mmol) was added and the solution was stirred for 18 hours at room temperature. The reaction mixture was then diluted with EtOAc and washed twice with water. The organic layer was dried over sodium sulphate and evaporated to yield a yellow oil (65 mg), which was purified by preparative HPLC to yield the title compound.
