2-(Bromomethyl)-1,3-difluorobenzene → 1-(2,6-Difluorobenzyl)-2-(2,6-difluorophenyl)-4-nitrobenzimidazole

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2-(2,6-difluorophenyl)-4-nitrobenzimidazole (7.7 g, 28 mmol) was reacted with 2,6-difluorobenzylbromide (6.95 g, 33.6 mmol). The crude product was purified by recrystallization from diethylether:hexane (3:1), 9.8 g (24.4 mmol, 87%), yielding white crystals 1-(2,6-difluorobenzyl)-2-(2,6-difluorophenyl)-4-nitrobenzimidazole. M.p. 168-170° C. 1H-NMR (300 MHz, CD2Cl2): δ 8.13 (dd, J=8.1, 0.9 Hz, 1H, H5), 7.86 (dd, J=8.1, 0.9 Hz, 1H, H7), 7.59 (m, 1H, H4′), 7.43 (dd, J=8.1 Hz, H6), 7.28 (m, 1H, H4″), 7.12 (m, 2H, H3″,5″), 6.84 (m, 2H, H3″,5″), 5.44 (s, 2H, CH2).

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