Hydrochloric Acid → (S)-Benzyl 2-(3-amino-2-oxopiperidin-1-yl)acetate hydrochloride

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Reaction Steps

To a solution of compound 40 (4.00 g, 0.0110 mole) in 10 mL of ethyl acetate at room temperature was added 5N HCl in 5 ethyl acetate (50 mL, freshly prepared, 0.25 mole) in one portion. The solution was stirred for 3 hrs, solvent was evaporated, CH2Cl2 was added and the solvents were reevaporated. The residue was pumped at <1 mm Hg on a vacuum pump for 24 hours to afford 3.37 g (~Quantitative crude yield) of product 41 as a colorless foam. TLC (silica gel; CH2Cl2, methanol, conc. NH4OH: 27:3:1): Rf=0.32.

Provenance & Evidence