A solution of 107 mg (0.24 mmol) of 2-(difluoromethyl)-4-methoxy-1-[4-(4-morpholinyl)-6-(1-piperazinyl)-1,3,5-triazin-2-yl]-1H-benzimidazole in a mixture of 20 mL of THF and 20 mL of pyridine was cooled to 0° C. and 41 mg (0.36 mmol) of methanesulfonyl chloride was added. The mixture was allowed to warm to room temperature, and after 1 hr, water was added. The precipitate was collected, washed with water, and dried to give 95 mg (75% yield) of 2-(difluoromethyl)-4-methoxy-1-[4-[4-(methylsulfonyl)-1-piperazinyl]-6-(4-morpholinyl)-1,3,5-triazin-2-yl]-1H-benzimidazole: mp (MeOH) 311-314° C.; 1H NMR (CDCl3) δ 7.86 (dd, J=8.4, 0.6 Hz, 1H), 7.43 (t, JHF=53.5 Hz, 1H), 7.36 (t, J=8.2 Hz, 1H), 6.82 (d, J=7.8 Hz, 1H), 4.05 (s, 3H), 4.03 (m, 4H), 3.89 (m, 4H), 3.79 (m, 4H), 3.33 (m, 4H), 2.81 (s, 3H); Anal. Calcd. for C21H26F2N8O4S: C, 48.1; H, 5.0; N, 21.4. Found: C, 48.0; H, 4.9; N, 21.2%.
