Hydrochloric Acid → Ethyl 2-amino-3-oxo-3-(tetrahydrofuran-3-yl)propanoate, hydrochloride salt

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Lithium bis(trimethysilyl)amide (1 M solution in tetrahydrofuran, 288 mL, 0.288 mol) was added drop-wise to a solution of ethyl (2E)-[(diphenylmethyl)imino]ethanoate (70 g, 0.26 mol) in tetrahydrofuran (1 L) at −70° C. The reaction mixture was stirred for 30 minutes, and the resulting suspension was transferred via cannula into a solution of tetrahydrofuran-3-carbonyl chloride (35.7 g, 0.26 mol) in tetrahydrofuran (200 mL) at −70° C. The reaction mixture was stirred at room temperature for 2 hours, at which time aqueous hydrochloric acid (2 M, 260 mL) was added. After the reaction mixture had stirred for 15 minutes, the tetrahydrofuran was removed in vacuo, and the aqueous residue was washed with ethyl acetate (4×200 mL). The aqueous layer was freeze-dried, affording the product as a light yellow solid. Yield: 40 g, 0.20 mol, 77%.

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