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

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A solution of (2R)-3-benzyloxy-2-(N-(t-butoxycarbonyl)amino)propanoic acid (23 g, 78 mmol, [α]D −4.4° (c=2, H2O )) in methanol (250 mL) was cooled to 0° C. and HCl (g) bubbled into the solution until saturated. The resulting mixture was stirred at ambient temperature for 17 hours and then concentrated in vacuo to afford 17 g (100% yield) of (2R)-3-benzyloxy-2-aminopropanoic acid methyl ester, a compound of formula (M), as a white solid; NMR (DMSO-d6) 8.7 (br s, 3), 7.4-7.3 (m, 5), 4.5 (q, 2), 4.4 (br s, 1), 3.8 (s, 2), 3.7 (s, 3) ppm.

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