(R)-2-((tert-butoxycarbonyl)amino)propyl methanesulfonate → (S)-Methanesulphonic acid 2-Boc-aminopropyl ester

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In the same manner was prepared methanesulfonic acid (R)-2-tert-butoxycarbonylamino-propyl ester (white solid) using the 2-(R)-boc-2-amino-propanol as starting material (yield=14.09 g, 97% yield); 1H NMR (400 MHz, CDCl3) δ ppm 4.55-4.67 (1 H, m), 4.17-4.27 (1 H, m), 4.11-4.17 (1 H, m), 3.90-4.02 (1 H, m), 3.02 (3 H, s), 1.43 (9 H, s), 1.22 (3 H, d, J=6.85 Hz).

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