Cesium carbonate → 2-{[4-(3-fluoropyridin-2-yl)piperazin-1-yl]methyl}-1H-benzimidazole

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Reaction Steps

The product of Example 28B (0.50 g, 2.76 mmol), 2-chloromethyl-1H-benzimidazole (0.48 g, 2.90 mmol), and cesium carbonate (1.8 g, 5.52 mmol) were combined in N,N-dimethylformamide (28 mL) at 23° C. and stirred for 1.25 hours. The mixture was concentrated under reduced pressure and rinsed with 10% methanol/dichloromethane. The solid was filtered off and the filtrate concentrated under reduced pressure. The residue was impregnated onto flash silica gel and chromatographed on flash silica gel (10% methanol/dichloromethane) to afford 311 mg (36% yield) of the title compound. mp 210-212°° C.; 1H NMR (300 MHz, DMSO-d6) δ 2.62 (m, 4H), 3.43 (m, 4H), 3.78 (s, 2H), 6.87 (m, 1H), 7.14 (m, 2H), 7.50 (m, 3H), 8.00 (m, 1H); MS (APCI) m/e 312 (M+H)+; Anal. calcd for C17H18FN5 0.4 H2O: C, 64.10; H, 5.95; N, 21.98. Found: C, 64.16; H, 5.86; N, 21.95.

Provenance & Evidence