Water → 2-butyl-4-chloro-5-hydroxymethyl-1-[(2'-(1-(4-nitrophenyl)-1H-tetrazol-5-yl)biphenyl-4-yl)methyl]imidazole

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Potassium carbonate (0.48 g) was added to a solution of 2-butyl-4-chloro-5-hydroxymethylimidazole (prepared as described in U.S. Pat. No. 4,355,040) (0.56 g) and 5-(4'-bromomethylbiphenyl-2-yl)-1-(4-nitrophenyl)-1H-tetrazole (1.3 g) in DMF (15 ml) and the mixture was stirred under an atmosphere of argon at 60° C. for 5 hours. The mixture was cooled to ambient temperature, water (60 ml) was added and the mixture was extracted with ethyl acetate (3×50 ml). The combined extracts were washed with saturated sodium chloride solution, dried (MgSO4) and the solvent removed by evaporation. The residue was purified by flash chromatography, eluting with ethyl acetate/hexane (1:1 v/v), to give 2-butyl-4-chloro-5-hydroxymethyl-1-[(2'-(1-(4-nitrophenyl)-1H-tetrazol-5-yl)biphenyl-4-yl)methyl]imidazole (180 mg) as a pale yellow solid, m.p. 182°-186° C.; NMR (CDCl3) 0.87(t,3H), 1.32(m,2H), 1.65(m,2H), 2.49(t,2H), 4.57(s,2H), 5.15(s,2H), 6.58(d,2H), 6.75(d,2H), 6.90(dd,2H), 7.36(dd,1H), 7.65(m,2H), 7.85(dd,1H), 8.00(dd,2H); mass spectrum (+ve FAB, DMSO/CH3OH/m-nitrobenzyl alcohol): 544 (M+H)+.

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