Hexane → 4,5-Dichloro-2-(2-phenyl-propionylamino)-benzoic acid methyl ester

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The objective compound was prepared by the same procedure for the intermediate 1, using a 2-phenyl-propionic acid (2.00 g, 13.3 mmol), SOCl2 (2.28 mL, 40.0 mmol), and 2-amino-4,5-dichloro-benzoic acid methyl ester (1.95 g, 8.88 mmol). After normal workup, the pure objective compound (2.97 g, 95%) was obtained as pale yellow solid by a flash column chromatography (n-hexane:EtOAc=20:1): 1H NMR (200 MHz, CDCl3) δ 1.59 (d, J=7.1 Hz, 3H, CH3), 3.70-3.89 (m, 4H, CO2CH3& CH), 7.28-7.42 (m, 5H, ArH), 8.03 (s, 1H, ArH), 8.99 (s, 1H, ArH), 11.00 (br s, 1H, NH).

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