To a solution of {(3,5-bis-trifluoromethyl-benzoyl)-[4-(2-chloro-phenyl)-pyridin-3-yl]-amino}-acetic acid methyl ester (109 mg, 211 μmol, example 88) in dioxane (2 mL) was added water (2 mL) and lithium hydroxide hydrate (11.1 mg, 264 μmol). The reaction mixture was stirred at room temperature for 2 hours and then poured on 30 mL 1M aqueous HCl and 30 mL EtOAc. The layers were separated and the aqueous layer was extracted a second time with 30 mL EtOAc. The organic layers were washed with 30 mL brine, dried over MgSO4, filtered and evaporated to give a yellow solid which was pure enough for the next step (119 mg, 112%). MS (ESI): m/z=503.060 [M+H]+.
