Methyl iodide → N-[2-tert-Butyl-1-(cyclohexylmethyl)-1H-benzimidazol-5-yl]-N-methylacetamide

Participants

Reaction Steps

Sodium hydride (201.5 mg, 5.04 mmol) was added to a solution of N-[2-tert-butyl-1-(cyclohexylmethyl)-1H-benzimidazol-5-yl]acetamide (549.8 mg, 1.68 mmol) (for preparation see in Example 9) in THF (50 mL) at 0° C. Stirring for 30 min., iodomethane was added. The resulting mixture was stirred overnight at room temperature and quenched with saturated NaHCO3 aqueous solution (5 mL) and water (10 mL). Two phases were separated. The aqueous was extracted with EtOAc (3×20 mL). The combined organic phases were washed with saturated NaHCO3 aqueous solution (20 mL), saturated NaCl aqueous solution (20 mL) and dried over Na2SO4. After evaporation of the solvent, the residue was purified by MPLC (EtOAc as eluent on silica gel) to give the desired title compound as a white solid (580.5 mg, 100%). 1H NMR (400 MHz, CD3OD): δ 1.26 (m, 5H), 1.67 (m, 2H), 1.69 (s, 9H), 1.71 (m, 1H), 1.78 (m, 2H), 1.87 (s, 3H), 2.14 (m, 1H), 3.30 (s, 3H), 4.49 (d, J=7.62 Hz, 2H), 7.55 (d, J=8.40 Hz, 1H), 7.71 (s, 1H), 8.00 (d, J=8.40 Hz, 1H). MS (ESI) (M+H)+: 342.3. Anal. Calcd for C21H31N3O+1.30 TFA+0.80H2O (504.14): C, 56.23; H, 6.78; N, 8.33. Found: C, 56.21; H, 6.77; N, 8.17.

Provenance & Evidence