Hydrochloric Acid → 1-[2-(4-aminopiperidin-1-yl)ethyl]-7-methoxyquinolin-2(1H)-one

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A solution of tert-butyl {1-[2-(7-methoxy-2-oxoquinolin-1(2H)-yl)ethyl]piperidin-4-yl}carbamate (Intermediate 2, 150 mg, 0.37 mmol) in dioxane (4 mL) was treated at room temperature under vigorous stirring with a solution of HCl in dioxane (4M, 2 mL). After 18 hours, the reaction mixture was concentrated under reduced pressure. The residue was taken up in dichloromethane (60 mL) and saturated aqueous sodium hydrogen carbonate solution (10 mL). The aqueous phase was extracted three times with dichloromethane (3×50 mL) and the combined organic phases were dried over sodium sulfate and concentrated under reduced pressure to give 113 mg (100% yield) of the crude product as an oil.

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