To a solution of 2-{3-[(5-chloro-4-{[3-(3-methoxyphenyl)propyl]amino}pyrimidin-2-yl)amino]phenyl}ethanol (0.35 g, 0.73 mmol) in methylene chloride (4.7 mL) was added slowly a solution of boron tribromide in methylene chloride (3.6 mL, 3.6 mmol, 1.0 M) at 0° C. The mixture was allowed to warm up to rt and stirred overnight. The resultant mixture was cooled in dry ice when Na2CO3 (saturated aqueous solution) was added. The mixture was filtered and the solid collected was triturated with EtOAc, followed by washing with EtOAc and water successively to give the desired product as an off-white powder (303 mg, 90%). LCMS for C21H23BrClN4O (M+H)+: m/z=461.0, 463.0. 1H NMR (400 MHz, CD3OD): δ 7.95 (s, 1H), 7.91 (s, 1H), 7.44 (d, J=7.2 Hz, 1H), 7.38 (m, 1H), 7.08 (m, 1H), 6.97 (s, 1H), 6.68 (d, J=2.8 Hz, 1H), 6.59 (m, 2H), 3.60 (m, 4H), 3.18 (m, 2H), 2.66 (t, J=7.6 Hz, 2H), 1.99 (t, J=7.6 Hz, 2H).
