1-Fluoro-2-nitrobenzene → (3S)-2-Oxo-3-tert-butoxycarbonylamino-2,3,4,5-tetrahydro-1H-1,5-benzodiazepine-1-acetic acid methyl ester

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(2S)-2-tert-Butoxycarbonylamino-3-(2-nitrophenyl-amino)-propionic acid. (2S)-2-tert-Butoxycarbonylamino-3-aminopropionic acid (10 g, 49 mmol), 2-fluoronitrobenzene (5.7 ml, 54 mmol), and NaHCO3 (8.25 g, 98 mmol) was taken into 130 ml of DMF and heated at 80° C. for 18 h. The reaction was evaporated in vacuo to give a viscous orange residue that was dissolved in 300 ml of H2O and extracted with Et2O (3×150 ml). The aq. solution was acidified to pH 5 with 10% NaHSO4 and extracted with EtOAc (3×250 ml). The combined extracts were dried over anhydrous Na2SO4, filtered, and evaporated to give 12.64 g (83%) of the title compound as an orange amorphous solid: 1H NMR (CD3OD) δ 8.15-8.10 (1H,d), 7.54-7.48 (1H,t), 7.13-7.08 (1H, d), 6.73-6.65 (1H, t), 4.45-4.35 (1H, m), 3.9-3.8 (1H, dd), 3.65-3.55 (1H, dd), 1.45 (9H, s).

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