Reaction Steps
A 25 mL screw top vial was charged with (2S,6R,7R,8S)-benzyl 8-(benzyloxy)-2-((tert-butoxycarbonyl)amino)-6-(4-methylbenzyl)-7-phenoxynonanoate (741 mg, 1.11 mmol), EtOAc (10 mL), and 10% Pd/C (61 mg, 0.057 mmol). The vial was sealed with a septum-cap, and the reaction was briefly degassed under high vacuum, and then repressurized under about 1 atmosphere of H2 (balloon pressure). This process was repeated 2×, and the reaction was stirred at room temperature under balloon pressure of hydrogen. After stirring for 19 h, the solids were removed by filtration through a pad of Celite®, rinsing with excess EtOAc. The filtrate was concentrated and then dried under high vaccuum to afford the title compound as a white solid (516 mg, 91%): mp 48-51° C.; 1H NMR (400 MHz, CDCl3) δ 7.30-7.17 (m, 2H), 7.09 (s, 4H), 6.97-6.83 (m, 3H), 6.69-6.02 (m, 2H), 5.00 (d, J=8.3 Hz, 1H), 4.33-3.96 (m, 3H), 3.03 (dd, J=13.8, 5.3 Hz, 1H), 2.49 (dd, J=13.9, 8.9 Hz, 1H), 2.33 (s, 3H), 2.19-2.08 (m, 1H), 1.78-1.62 (m, 1H), 1.59-1.15 (m, 17H); 13C NMR (101 MHz, CDCl3) δ 176.73, 159.43, 155.73, 138.03, 135.33, 129.57, 129.10, 129.06, 120.88, 115.85, 82.16, 80.24, 68.15, 53.26, 41.47, 35.46, 32.45, 29.53, 28.35, 22.51, 21.05, 20.01; ESIMS: m/z 486 ([M+H]+).
