反应详情

The objective compound was prepared by the same procedure for the intermediate 1, using a 2-(4-nitro-phenyl)-propionic acid (1.95 g, 10.0 mmol), SOCl2 (3.6 mL, 33.4 mmol), and 2-amino-4-chloro-benzoic acid methyl ester (1.24 g, 6.67 mmol). After normal workup, the pure objective compound (2.29 g, 95%) was obtained as slightly yellow solid by a flash column chromatography (n-hexane:EtOAc=8:1): 1H NMR (200 MHz, CDCl3) δ 1.65 (d, J=7.3 Hz, 3H, CH3), 3.83-3.93 (m, 4H, CO2CH3 & CH), 7.04 (dd, J=8.5, 2.0 Hz, 1H, ArH), 7.58 (d, J=8.9 Hz, 2H, ArH), 7.93 (d, J=8.5 Hz, 1H, ArH), 8.21 (d, J=8.9 Hz, 2H, ArH), 8.79 (d, J=2.0 Hz, 1H, ArH), 11.09 (br s, 1H, NH).