A solution of 6-(2-(tert-butoxycarbonyl(isopropyl)-amino)thiazol-5-yl)-8-phenylimidazo[1,2-a]pyridine-2-carboxylic acid (100 mg, 0.21 mmol) in dichloromethane was treated with EDC (48 mg, 0.25 mmol), HOBT (34 mg, 0.25 mmol), Et3N (25 mg. 0.25 mmol), methylamine (2 M in THF: 3 ml, 6 mmol) and stirred at room temperature overnight. The reaction mixture was concentrated on a rotary evaporator and the residue purified by chromatography on silica gel using ethyl acetate/hexanes (50%) as eluent to give 30 mg (30% yield) of tert-butyl isopropyl(5-(2-(methylcarbamoyl)-8-phenylimidazo[1,2-a]pyridin-6-yl)thiazol-2-yl)carbamate as a white solid. LCMS (Conditions C): 4.26 min (RT); (M+H)+=492.43 (100%).
