[C:1]([O:5][C:6](=[O:19])[N:7]([CH2:9][C:10]1[CH:15]=[CH:14][C:13]([N+:16]([O-])=O)=[CH:12][CH:11]=1)[CH3:8])([CH3:4])([CH3:3])[CH3:2].[H][H].C(OC(C)C)(C)C>[Pd].CCOC(C)=O>[C:1]([O:5][C:6](=[O:19])[N:7]([CH2:9][C:10]1[CH:11]=[CH:12][C:13]([NH2:16])=[CH:14][CH:15]=1)[CH3:8])([CH3:4])([CH3:2])[CH3:3]A Parr bottle was charged with (4-nitrobenzyl)-methy-carbarnic acid tert-butyl ester (30.0 g, 113 mmol), 150 mL EtOAc, and 10% Pd/C (3.0 g, 10 wt %), and shaken under 40 psi hydrogen for 90 min. When hydrogen uptake ceased, the reaction vessel was purged with nitrogen, filtered through celite, and concentrated to provide a tan solid, which was granulated with 300 mL of isopropyl ether to provide the title compound as an off-white solid (17.7 g in two crops, 75 mmol, 66% yield):
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