Iodide Ion → 7-(1-Ethylpropyl)-4-methoxy-1-methyl-1,3-dihydro-2H-benzimidazol-2-one

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A solution of 4-bromo-7-(1-ethylpropyl)-1-methyl-1,3-dihydro-2H-benzimidazol-2-one (250 mg, 0.841 mmol), anhydrous cuprus iodide (192 mg, 1.01 mmol) and 28% sodium methoxide in methanol (5.2 mL) in N,N-dimethylformamide (5 mL) was heated at 100° C. for 1 h. After cooling, the mixture was diluted with water and extracted with ethyl acetate. The organics were dried over magnesium sulfate, filtered and concentrated in vacuo to give the title compound (190 mg, 0.765 mmol, 91%).

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