反应详情

2-(2,6-Difluorophenyl)-4-methoxylbenzimidazole (5005, Example 46) (2.02 g, 7.77 mmol) was reacted with benzyl bromide (1.20 mL, 10.1 mmol, 130 M %). The crude product was purified by flash chromatography eluting with 2% MeOH/ CH2Cl2 and recrystallization from diethylether/hexane (3:1), yielding white crystals of 1-benzyl-2-(2.6-difluorophenyl)-4-methoxylbenzimidazole (2.47 g, 7.05 mmol, 90% yield). M.p. 139-141° C. 1H-NMR (200 MHz, CD2Cl2) δ 7.48 (m, 1H, H4′), 7.25-6.96 (m, 8H), 6.86 (dd, J=0.8, 8.3 Hz, 1H, H5), 6.72 (dd, J=8.0, 0.8 Hz, 1H, H7), 5.24 (s, 2H, CH2Ph), 4.01 (s, 3H, OCH3).

1. customThe crude product was purified by flash chromatography
2. washeluting with 2% MeOH/ CH2Cl2 and recrystallization from diethylether/hexane (3:1)