Diisopropylethylamine → 2-Fluoro-6-(4-methanesulfonylpiperidine-1-yl)benzaldehyde

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In a 250 mL round bottom flask, 2,6-difluorobenzaldehyde (7.12 g, 5.4 mL, 50.1 mmol), 4-methanesulfonylpiperidine hydrochloride (10 g, 50.1 mmol) and DIPEA (7.77 g, 60.1 mmol) were combined with acetonitrile (75 mL). The mixture was stirred and heated at 80° C. overnight. The mixture was evaporated and extracted with dichloromethane and citric acid solution. The organic layer was washed with brine, dried over sodium sulfate, and evaporated. The crude solid was triturated with cold ethyl acetate to afford 2-fluoro-6-(4-methanesulfonylpiperidine-1-yl)benzaldehyde (12 g, 84% yield). LC-MS calcd for C13H16FNO3S (m/e) 285.08, obsd 286.0 (M+H).

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