Dimethyl Sulfate → 1,3-Dihydro-5-methoxy-1-methyl-2H-indol-2-one

Participants

Reaction Conditions

Reaction Steps

A dry round-bottom flask was charged with NaH (60% wt) (64 mg, 1.61 mmol) and toluene (2.0 mL). The suspension was heated to 100° C. and then 5-methoxyindolin-2-one (250 mg, 1.53 mmol) was added. After 30 min at 100° C. Me2SO4 (0.16 mL, 1.68 mmol) was added and the temperature maintained at 100° C. for 2.5 h. The reaction was cooled to room temperature and the solvent removed. The residue was purified by column chromatography (silica gel, 25-33% EtOAc in hexane) to give 5-methoxy-1-methylindolin-2-one (beige solid, 144 mg, 53%); MS ESI 164.1 [M+H]+, calcd for [C9H9NO2+H]+ 164.07.

Provenance & Evidence