C(OC([NH:11][C@H:12]1[C@H:17]2[O:18][C@H:14]([CH2:15][CH2:16]2)[C@H:13]1[C:19]([O:21][CH3:22])=[O:20])=O)C1C=CC=CC=1>C(OCC)(=O)C.[Pd]>[NH2:11][C@H:12]1[C@H:17]2[O:18][C@H:14]([CH2:15][CH2:16]2)[C@H:13]1[C:19]([O:21][CH3:22])=[O:20]To a solution of methyl (1R,2S,3R,4S)-3-{[(benzyloxy)carbonyl]amino}-7-oxabicyclo[2.2.1]heptane-2-carboxylate (2.23 g, 7.30 mmol) in ethyl acetate (60 mL), 5% palladium on carbon (0.5 g, 22% by weight) was added. The flask was degassed and backfilled with hydrogen gas via balloon. The mixture was stirred at 25° C. for 16 h, passed through a plug of Celite and rinsed with ethyl acetate. The filtrate was concentrated in vacuo to afford the desired product, methyl (1R,2S,3R,4S)-3-amino-7-oxabicyclo[2.2.1]heptane-2-carboxylate (1.0 g, 5.84 mmol, 80%), as a clear oil. 1H NMR (400 MHz, CDCl3) δ: 1.43 (2H, m), 1.67 (1H, m), 1.76 (1H, m), 2.82 (1H, d, J=7.6 Hz), 3.41 (1H, d, J=7.6 Hz), 3.73 (3H, s), 4.28 (1H, d, J=6.0 Hz), 4.81 (1H, d, J=4.8 Hz).
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