Tert-butyl 5-[(2-chloropyrimidin-4-yl)amino]-1-methyl-1H-benzimidazol-2-yl(phenyl)carbamate (0.97 g, 2.2 mmol) was dissolved in DMF (10 ml) and cesium carbonate (2.15 g, 6.6 mmol) was added. After 15 min, iodomethane (0.20 ml, 3.3 mmol) was added, and the reaction was stirred at rt. After TLC showed the starting material to be consumed, the reaction was diluted with water. The aqueous layer was extracted with EtOAc. The combined organic layers were washed with water, dried over MgSO4 and concentrated to a red foam. The crude material was purified through silica gel to give the title compound as a white solid (0.80 g. 78% over two steps). 1H NMR (300 MHz, d6-DMSO) δ 7.90 (d, J=6.3 Hz, 1H), 7.72 (d, J=8.7 Hz, 1H), 7.60 (d, J=1.8 Hz, 1H), 7.38 (m, 4H), 7.25-7.29 (m, 2H), 6.17 (d, J=5.7 Hz, 1H), 3.78 (s, 3H), 3.41 (s, 3H), 1.41 (s, 9H). MS (ESI) m/z=465 [M+H]+.
