Methyl morpholine oxide → 2-[(2R,6S)-2,6-dimethylmorpholin-4-yl]-3,4-difluoro-5-(phenylcarbonyl)benzaldehyde

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Reaction Steps

NMO (295 mg, 0.0025 mmol) and TPAP (44 mg, 0.0001 mmol) were added to a stirred solution of {4-[(2R,6S)-2,6-dimethylmorpholin-4-yl]-2,3-difluoro-5-(hydroxymethyl)phenyl}(phenyl)methanone (Intermediate 23, 450 mg, 0.001 mmol) in anhydrous CH2Cl2:CH3CN (1:1, 10 mL) at 0° C., and the mixture was stirred for 12 hours with warming to room temperature. The solvents were removed and the residue was purified over a silica gel chromatography column using ethyl acetate-pet. ether gradient, providing the title compound. Yield: 340 mg, (76%)

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