2-Methylpiperidine → 5-Bromo-2-(2-methylpiperidin-1-YL)benzaldehyde

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To a solution of 5-bromo-2-fluorobenzaldehyde (13.20 g; 65.02 mmol) in DMSO (160 mL) and water (40 mL) were added 2-methylpiperidine (15.35 mL; 130.04 mmol) and anhydrous sodium carbonate (13.78 g; 130.04 mmol). The resulting mixture was heated at 120° C. for 16 h after which it was allowed to cool to RT. Reaction mixture was partitioned between H2O (1 L) and Et2O (2×750 mL) and the combined organic layers were washed with brine (500 mL, pH 5-6 adjusted with HCl), dried over MgSO4, filtered and dried under vacuum to give the title compound as a brown yellow oil (16.3 g, 89%). LC/MS (Method B): 282.1 (M+H)+. HPLC (Method A): Rt 2.20 min (Purity: 93.7%).

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