Potassium Carbonate → N-methoxyethyl piperidinesulfonamide

To a slurry of the piperidine sulfonamide from part F (420 mg, 0.8 mmol) in methanol (15 mL) was added ammonium formate (147 mg, 2.3 mmol). The system was purged with nitrogen for 10 minutes. The nitrogen stream was removed and palladium on carbon (80 mg of 10 weight % on activated carbon, 50% water) was added. The reaction was refluxed for forty five minutes, cooled, filtered through Celite under nitrogen, and concentrated in vacuo. The residue was dissolved in dry dimethylformamide (5 mL) and potassium carbonate (150 mg, 1.07 mmol) and 2-bromoethyl methyl ether (100 mL, 1.07 mmol) were added. The reaction was stirred at thirty five degrees Celsius for thirty hours and then concentrated in vacuo. The residue was taken up in ethyl acetate and filtered through Celite. The filtrate washed with water two times, saturated sodium chloride solution, dried over Na2SO4, filtered, and concentrated in vacuo. The product was recrystallized (methanol) to give the N-methoxyethyl piperidine sulfonamide as an off-white solid (190 mg, 53%).