Sodium hydride → 2-(4-Chlorophenoxymethyl)-4-benzyloxy-1-[3-[1-(t-butoxycarbonyl)piperidin-4-yl]propyl]-benzimidazole

Participants

Reaction Steps

A solution of 2-(4-chlorophenoxymethyl)-4-benzyloxy-benzimidazole (720 mg, 1.97 mmol, 1.0 eq) in dry N,N-dimethylformamide (8 ml, 0.25 M) was treated with sodium hydride (60% in mineral oil, 57 mg, 2.30 mmol, 1.2 eq). The resulting mixture was stirred at room temperature for thirty minutes and then 3-[1-(t-butoxycarbonyl)piperidin-4-yl]propyl bromide (7.24 mg, 2.36 mmol, 1.2 eq) was added to the reaction mixture. The resulting mixture was stirred at 70° C. for three hours. The reaction was quenched by the addition of water (1×30 ml). The aqueous fraction was extracted with diethyl ether (1×30 ml). The organic fractions were combined, washed with water (1×30 ml), then brine (1×30 ml), and then dried over sodium sulfate. The solvents were removed in vacuo. The desired title product was further purified by flash chromatography to provide a white foam in 38% yield.

Provenance & Evidence