Bromine → HCID 22625618, compound

Participants

Reaction Steps

Bromine (0.54 g, 3.1 mmol), in 7 ml of methylene chloride, was added dropwise to a solution of 0.9 g (3.2 mmol) of 4-(2,4-dichlorophenyl)-1-difluoromethyl-2-methylimidazole stirring in 35 ml of methylene chloride. The reaction mixture was stirred at room temperature overnight. Another 0.3 g of bromine, in 5 ml of methylene chloride, were added and the reaction stirred overnight. Methylene chloride (250 ml) and saturated sodium bicarbonate (200 ml) were added and the organic layer separated and washed with saturated sodium bicarbonate and brine followed by drying over magnesium sulfate. Evaporating in vacuo gave a red oil residue. Flash chromatography on silica gel (20:1-10:1-5:1-3:1 hexane/ethyl acetate) afforded 0.7 g of 5-bromo-4-(2,4-dichlorophenyl)-1-difluoromethyl-2-methylimidazole as a white solid (m.p. 81°-83° C.). NMR (CDCl3, 200 MHz) δ: 2.65 (s, 3H), 7.20 (t, 1H), 7.27-7.40 (m, 2H), 7.52 (s, 1H).

Provenance & Evidence