2-Aminoquinoline → 2-(3-bromo-4-methanesulfonyl-phenyl)-3-cyclopentyl-N-quinolin-2-yl-propionamide

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A solution of 2-(3-bromo-4-methanesulfonyl-phenyl)-3-cyclopentyl-propionic acid (prepared as in Example 24, 100 mg, 0.266 mmol) in methylene chloride (8 mL) was treated with dry N,N-dimethylformamide (2 drops). The reaction mixture was cooled to 0° C. and then treated dropwise with a 2M solution of oxalyl chloride in methylene chloride (0.15 mL, 0.29 mmol). The reaction mixture was stirred at 0° C. for 10 min and then stirred at 25° C. for 30 min. The reaction mixture was then treated with N,N-diisopropylethylamine (0.11 mL, 0.63 mmol) followed by a solution of 2-aminoquinoline (92 mg, 0.56 mmol) in dry tetrahydrofuran (3 mL). The resulting reaction mixture was stirred at 25° C. for 17 h. The reaction mixture was concentrated in vacuo. The resulting residue was adsorbed onto silica gel (Merck Silica gel 60, 230-400 mesh) and then purified via Biotage chromatography (FLASH 40S, Silica, 3/2 hexanes/ethyl acetate) to afford the 2-(3-bromo-4-methanesulfonyl-phenyl)-3-cyclopentyl-N-quinolin-2-yl-propionamide (122 mg, 92%) as a white foam; mp 95-100° C. EI-HRMS m/e calcd for C24H25BrN2O3S (M+) 500.0769, found 500.0775.

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