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A solution of 0.224 g (0.5 mmol) of 2-(difluoromethyl)-4-methoxy-1-[4-(4-morpholinyl)-6-(1-piperazinyl)-1,3,5-triazin-2-yl]-1H-benzimidazole (Example 2) and 25 mg of DMAP in 10 mL of pyridine was cooled to 0° C. and 0.122 g (0.75 mmol) of 2-chloroethanesulfonyl chloride was added dropwise over 5 min. The mixture was stirred at 0° C. for 2 hrs and water was added to give a precipitate which was collected and dried. Chromatography on silica eluting with CH2Cl2/EtOAc (4:1) gave 183 mg (31% yield) of 2-(difluoromethyl)-4-methoxy-1-{4-(4-morpholinyl)-6-[4-(vinylsulfonyl)-1-piperazinyl]-1,3,5-triazin-2-yl}-1H-benzimidazole: mp (MeOH) 242-244° C.; 1H NMR (CDCl3) δ 7.85 (dd, J=8.4, 0.7 Hz, 1H), 7.43 (t, JHF=53.5 Hz, 1H), 7.35 (t, J=8.2 Hz, 1H), 6.82 (d, J=7.7 Hz, 1H), 6.43 (dd, J=16.6, 9.8 Hz, 1H), 6.29 (d, J=16.6 Hz, 1H), 6.07 (d, J=9.8 Hz, 1H), 4.05 (s, 3H), 4.01 (m, 4H), 3.87 (m, 4H), 3.78 (m, 4H), 3.26 (m, 4H); MS (APCI+) m/z 538.4; Anal. Calcd. for C22H26F2N8O4S: C, 49.25; H, 4.9; N, 20.9. Found: C, 49.1; H, 5.0; N, 20.4%.

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