To a solution of 3-{1-[(2-chloroethyl)sulfonyl]-4-piperidinyl}-5-phenyl-1H-indole-7-carboxamide (26 mg, 0.063 mmol) in CH3CN (5 mL), dimethylamine (0.16 mL, 0.315 mmol), K2CO3 (35 mg, 0.252 mmol) and NaI (cat. 0.5 mg) were added. The reaction mixture was stirred at 80° C. for 16 hours. The solvent was removed under reduced pressure. The residue was partitioned between ethyl acetate and water. The organic phase was dried over magnesium sulfate, filtered and the solvent removed under reduced pressure. The resulting residue was purified by reverse phase HPLC (CH3CN/water, 0.1% TFA) to give title compound (14 mg, 48%).
