反应详情

5,5-Dimethyl-8-nitro-2,3,4,5-tetrahydro-1H-benzo[b]azepine (0.797 g, 3.62 mmol), Pyridine (0.310 mL, 3.83 mmol) and 4-Dimethylaminopyridine (21 mg, 0.17 mmol) were dissolved in anhydrous 1,2-Dichloroethane (5.0 mL) before adding p-Nitrophenyl Chloroformate (0.541 g, 2.68 mmol). The reaction was stirred at room temperature for 41 hours and then concentrated under reduced pressure. The residue was purified by normal phase chromatography to yield an off-white solid, 5,5-Dimethyl-8-nitro-2,3,4,5-tetrahydro-benzo[b]azepine-1-carboxylic acid 4-nitro-phenyl ester (0.475 g, 46%). LCMS: m/z=386.07 (M+H+). 1H NMR (400 MHz, CDCl3) δ 8.21 (m, 4H), 7.65 (d, 1H, J=8.8 Hz), 7.42 (m, 1H), 7.23 (m, 1H), 4.53 (m, 1H), 2.87 (m, 1H), 2.32 (m, 1H), 1.69 (m, 5H), 1.34 (m, 4H).

1. concentrationconcentrated under reduced pressure
2. customThe residue was purified by normal phase chromatography