Methanol → (2R)-3-benzyloxy-2-aminopropanoic acid methyl ester

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To a solution of BOC-O-benzyl-D-serine (5.05 g, 17.12 mmol) in MeOH (100 mL) at −78° C., was added SOCl2 dropwise. The reaction mixture was warmed to 0° C. and stirred for ˜4 hours and then concentrated. The residue was taken up in EtOAc and washed with 10% Na2CO3 (3×80 mL). The organic layer was dried over sodium sulfate, filtered and concentrated. To the crude material in EtOAc (100 mL) at 0° C. was bubbled HCl gas for approximately 10 minutes, and the reaction was capped and the mixture stirred at 0° C. for 30 minutes before it was concentrated in vacuo. The crude material was diluted with 50 mL of a 1:1 solution of saturated NaHCO3/10% Na2CO3 and extracted with EtOAc (4×50 mL). The combined organics were dried over sodium sulfate, filtered, and concentrated to give O-benzyl-D-serine methyl ester (3.13 g, 14.96 mmol) which was used without further purification. LCMS (ES) m/z 210.1 (M+H)+.

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