Methyl morpholine oxide → 5-acetyl-2-((2R,6S)-2,6-dimethyl-morpholin-4-yl)-3,4-difluoro-benzaldehyde

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Reaction Steps

To an ice-cooled solution of 1-[4-((2R,6S)-2,6-dimethyl-morpholin-4-yl)-2,3-difluoro-5-hydroxymethyl-phenyl]-ethanone (Intermediate 10, 3.2 g, 9.72 mmol) in CH2Cl2/CH3CN mixture (20 mL, 1:1 v/v) was added NMO (2.2 g, 19.44 mmol) followed by TPAP (340 mg, 0.97 mmol) and mixture stirred for 2 hours at room temperature. The reaction mixture filtered thorough silica gel bed and washed with EtOAc. The organic phase concentrated under reduced pressure to give the title compound as a yellow crystalline solid. Yield: 3.0 g (94%).

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