反应详情

Ethyl 2-(4-chloro-3-fluorophenylamino)-2-oxoacetate (4.18 g, 0.017 mol) to a solution of NaOH (1.361 g, 0.0340 mol) in mixture 50 ml EtOH and 50 ml water was added and the resulting mixture was stirred at RT for 6 h. The mixture was acidified with 2N HCl to pH 4-5 at 0° C. The precipitate was filtered, washed with water and dried on the air to afford 2-(4-chloro-3-fluorophenylamino)-2-oxoacetic acid (3′) (2 g, 55.2%) as a white solid. LC-MS (APCI+) m/z: calcd for C8H5ClFNO3: 216.99. found: 217 (M+H+).

1. filtrationThe precipitate was filtered
2. washwashed with water
3. customdried on the air