In an ice bath at −15° C., pure compound of Formula 202 (7.2 g, 29 mmol) was combined with 2-amino-4-chloro-benzoic acid methyl ester (4.5 g, 24 mmol), PyBroP (2.3 g, 4.9 mmol) and diisopropylethylamine (0.95 mL, 5.4 mmol) in DMF (30 mL). The resulting mixture was stirred ovemight, allowing the temperature to rise to room temperature with the bath. The solution was concentrated under vacuum and the residue partitioned between ethyl acetate (200 mL) and water (200 mL). The organic layer was washed with water (3×100 mL) and concentrated under vacuum. The resulting residue was purified by silica gel chromatography using 40% ethyl acetate/hexanes as eluent to give 2.66 g (21% yield) of the desired product of Formula 203, 4-chloro-2-{[1-(4-methyl-benzoyl)-piperidine-2-carbonyl]amino}-benzoic acid methyl ester, as a crystalline solid. LRMS (MH+) m/z 472.
