反应详情

To a suspension of sodium hydride (50 mg, 1.25 mmol, 60% in mineral oil) in dry THF (20 mL) was added a solution of 4,6-dichloro-2-[2-(4-nitro-phenyl)-propionylamino]-benzoic acid methyl ester (0.20 g, 0.50 mmol) in THF anhydride (5 mL) at 0° C. The reactant was stirred for 5 hours, and the reaction was quenched by addition of 0.5M HCl solution (30 mL). The resultant was extracted with ethyl acetate (50 mL×3), washed with water (50 mL×2) and brine (50 ml×2) and dried over magnesium sulfate anhydride. After evaporation of solvent, the pure objective compound (0.18 g, 99%) was obtained as pale yellow solid by a recrystallization (dichloromethane:EtOAc 3:1): 1H NMR (200 MHz, CDCl3) δ 1.79 (s, 3H, CH3), 6.80 (d, J=1.8 Hz, 1H, ArH), 7.15 (d, J=1.8 Hz, 1H, ArH), 7.38 (d, J=9.0 Hz, 2H, ArH), 8.18 (d, J=9.0 Hz, 2H), 8.43 (s, 1H, NH); MS(EI) m/e 364 [M+].

1. customthe reaction was quenched by addition of 0.5M HCl solution (30 mL)
2. extractionThe resultant was extracted with ethyl acetate (50 mL×3)
3. washwashed with water (50 mL×2) and brine (50 ml×2)
4. dry with materialdried over magnesium sulfate anhydride
5. customAfter evaporation of solvent