Dimethylformamide → HCID 67215163, compound

Participants

Reaction Steps

5-[5-(5-Methyl-3-phenyl-isoxazol-4-yl)-[1,3,4]oxadiazol-2-yl]-1,3-dihydro-benzoimidazol-2-one (200 mg, 0.56 mmol) was heated in DMF (2 mL) until the suspension turned into solution. After the solution was cooled to ambient temperature iodomethane (38 μL, 0.61 mmol) was added and stirred for 18 h at this temperature. The resulting suspension was diluted with DMF (2 mL) and warmed until the reaction mixture became homogeneous. A solution of potassium bis(trimethylsilyl)amide (0.91 M in THF, 673 μL, 0.61 mmol) was added and stirred for 1 h at ambient temperature. Additional iodomethane (38 μL, 0.61 mmol) was added and stirring was continued for another 18 h. Additional potassium bis(trimethylsilyl)amide (0.91 M in THF, 673 μL, 0.61 mmol) was added, stirred for 15 min at ambient temperature, treated with iodomethane (0.38 μL, 0.61 mmol) and stirred for 5 h at this temperature. The reaction mixture was diluted with ethyl acetate (20 mL) and washed with aqueous sodium carbonate (saturated, 20 mL), water (20 mL) and brine (20 mL). The combined aqueous layers were extracted with ethyl acetate (20 mL) and the combined organic layers were dried over sodium sulfate. Purification by chromatography (SiO2, heptane:ethyl acetate:dichloromethane=40:40:20 to 10:70:20) afforded the title compound (29 mg, 13%) as a white solid. MS: m/e=388.1 [M+H]+.

Provenance & Evidence