Trityl chloride → 4-(2-bromophenyl)-1-trityl-1H-imidazole

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Reaction Steps

To a solution of 4-(2-bromophenyl)-1H-imidazole (880 mg, 3.94 mmol) in 10 mL DMF, were added TEA (0.605 mL, 4.34 mmol) and trityl chloride (1.21 g, 4.34 mmol). The mixture was stirred at rt for 14 h, then diluted with EtOAc. The organic phase was washed with H2O (2×) and brine, dried (Na2SO4), filtered through a 1″ pad of silica gel and concentrated. The crude product was purified by flash chromatography (0 to 40% EtOAc/hexanes gradient) to afford 1.34 g of Intermediate 217.1 as an off-white solid. LCMS (50 to 100% B, 4 min gradient, A 95% H2O/5% CH3CN/0.1% TFA, B=5% H2O/95% CH3CN/0.1% TFA) RT=0.77 min, 465.2 (M+H)+.

Provenance & Evidence