To a solution of (S)-methyl 3-fluoro-4-(2-oxo-1-(piperidin-4-yl)pyrrolidin-3-yloxy)benzoate hydrochloride (Example 151, Step B; 2.0 g, 5.9 mmol) in DMF (3 mL) was added N-ethyl-N-isopropylpropan-2-amine (3.8 g, 30 mmol) and 5-chloro-2,3-difluoropyridine (2.7 g, 18 mmol) and the reaction was heated to 60° C. overnight. The reaction was next diluted with EtOAc (30 mL) and washed with water (30 mL), and brine (30 mL), and the combined organic phases were dried over MgSO4, filtered and concentrated under vacuum. The crude material was purified on silica using a gradient of DCM to 1:19 EtOAc:DCM as eluent to yield (S)-methyl 4-(1-(1-(5-chloro-3-fluoropyridin-2-yl)piperidin-4-yl)-2-oxopyrrolidin-3-yloxy)-3-fluorobenzoate (1.5 g, 54%)
