Dimethyl Sulfate → 8-(1-((3,5-difluorophenyl)(methyl)amino)ethyl)-N-(2-hydroxyethyl)-N-methyl-2-morpholino-4-oxo-4H-chromene-6-carboxamide

Participants

Reaction Conditions

Reaction Steps

Lithium bis(trimethylsilyl)amide (0.539 mL, 0.54 mmol) was added to a stirred solution of N-(2-(tert-butyldiphenylsilyloxy)ethyl)-8-(1-(3,5-difluorophenylamino)ethyl)-N-methyl-2-morpholino-4-oxo-4H-chromene-6-carboxamide (230 mg, 0.32 mmol) dissolved in dry THF (3 mL). The solution was stirred over a period of 10 minutes at −20° C. under nitrogen. Dimethyl sulfate (0.051 mL, 0.54 mmol) was added to the mixture and the resulting suspension was left to rise to RT for 1 h30 under nitrogen. A sat. aq. sol. of NH4Cl was added and the reaction mixture was extracted with DCM. The combined organic phases were washed with brine, dried over magnesium sulfate and concentrated. The crude product was diluted with DCM and purified by flash chromatography on silica gel eluting with 4% ethyl alcohol in DCM. The solvent was evaporated to dryness to afford N-(2-(tert-butyldiphenylsilyloxy)ethyl)-8-(1-((3,5-difluorophenyl)(methyl)amino)ethyl)-N-methyl-2-morpholino-4-oxo-4H-chromene-6-carboxamide enantiomer 1 (210 mg, 90%) as a white solid. Mass Spectrum: M+H+ 740.

Provenance & Evidence