Cesium carbonate → methyl 1-[(7-cyano-2-naphthyl)methyl]-2-oxo-(3H)-benzimidazole-5-carboxylate

Participants

Reaction Steps

To a chilled solution of methyl 2-oxo-3-(benzyloxycarbonyl)—(3H)—benzimidazole-5-carboxylate (110 mg, 0.337 mmol) in DMF (3 mL) was added cesium carbonate (0.275 g, 0.84 mmol) followed by 7-(bromomethyl)naphthalene-2-carbonitrile (108 mg, 0.44 mmol). The reaction was stirred at room temperature for 1.5 hours, diluted with ethyl acetate, washed with water and brine, dried over sodium sulfate and concentrated in vacuo. This residue was redissolved in methanol (4 mL), CH3CN (3 mL) and IN LiOH (0.7 mL). The reaction mixture was stirred for 1 hour, acidified with 1N HCl (0.7 mL), filtered and dried to yield methyl 1-[(7-cyano(2-naphthyl))methyl]-2-oxo-(3H)—benzimidazole-5-carboxylate (84 mg, 70%) as awhite solid. ES-MS (M+H)+=358.1.

Provenance & Evidence