Methyl iodide → {1-[4-(4-Methoxyimino-2-phenyl-4H-chromen-3-yl)-phenyl]-cyclobutyl}-carbamic acid tert-butyl ester

Participants

Reaction Steps

To a stirred solution of {1-[4-(4-hydroxyimino-2-phenyl-4H-chromen-3-yl)-phenyl]-cyclobutyl}-carbamic acid tert-butyl ester (27 mg, 0.056 mmol) in DMF (2 mL) was added potassium carbonate (15.5 mg, 0.112 mmol) and iodomethane (0.011 mL, 0.168 mmol) at RT. After 2 hours, cesium carbonate (36.5 mg, 0.112 mmol) and iodomethane (0.021 mL, 0.336 mmol) were added and the mixture stirred for a further 1.5 hours. The reaction mixture was partitioned between EtOAc and water. The aqueous phase was isolated and extracted with EtOAc. The combined organic extracts were washed with water and brine, dried (Na2SO4), filtered, and concentrated in vacuo. The resultant residue was subjected to flash chromatography (SiO2, gradient 15 to 25% EtOAc in cyclohexane) to afford the title compound (25.1 mg, 90%) as a colourless gum. LCMS (Method A): RT=5.20 min, [M+H]+=497.

Provenance & Evidence