Sodium hydride → 2-(5-fluoro-4-formyl-2-methoxy-phenoxymethyl)-1H-benzoimidazole-5-sulfonic acid dimethylamide

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2-Fluoro-4-hydroxy-5-methoxy-benzaldehyde (39, 0.38 g, 2.2 mmol) was dissolved in N,N-dimethylformamide (30 mL) and sodium hydride 60% dispersion in mineral oil (120 mg) was added. After 20 minutes, 2-chloromethyl-1H-benzoimidazole-5-sulfonic acid dimethylamide hydrochloride salt (217, 0.559 g, 1.80 mmol) was added to the mixture. The reaction was stirred at 60° C. overnight. The solvent was removed under reduced pressure. Ethyl acetate was added and the organic layer was washed with water, dried over anhydrous sodium sulfate, and filtered. The filtrate was concentrated and purified by silica gel column chromatography eluting with a gradient of ethyl acetate (20-100%) in hexane to provide the desired compound (218, 0.122 g, 17%).

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