A solution of methyl 3-bromo-2-phenylquinoxaline-6-carboxylate (150 mg, 0.44 mmol, 1.00 equiv), 4-(3-chlorophenyl)piperidine hydrochloride (204.2 mg, 0.88 mmol, 2.00 equiv), and DIEA (194.8 mg, 1.51 mmol, 5.00 equiv) in DMF (4 mL) was placed in an 8-mL sealed tube and stirred overnight at 100° C. in an oil bath. The reaction was then quenched by the addition of water, then concentrated under vacuum. Purification via silica gel column (ethyl acetate/petroleum ether (1:100)) yielded 143.5 mg (64%) of methyl 3-(4-(3-chlorophenyl)piperidin-1-yl)-2-phenylquinoxaline-6-carboxylate as a yellow solid.
