To a solution of (R)-4-[6-(4-tert-butyl-cyclohexyloxy)-naphthalen-2-yl]-4-methyl-oxazolidin-2-one (73 mg, 0.19 mmol) in THF (1 mL) and DMF (1 mL) was added sodium hydride (60% in mineral oil, 12 mg, 0.29 mmol). After the mixture was stirred at room temperature for 2 hrs, methyl iodide (60 μL, 0.96 mmol) was added. The mixture was stirred at room temperature for 3 hrs. LCMS showed about 30% of conversion. Additional sodium hydride (60% in mineral oil, 50 mg) was added. After the mixture was stirred at room temperature overnight, the mixture was partitioned between NH4Cl aq and EtOAc. The organic phase was washed with water, dried over anhydrous MgSO4, filtered, and concentrated to give 80 mg of crude product, 106%. ESI-MS (M+H)+: 396.20, room temperature 2.53 min.
