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The suspension of (3,4-dichloro-phenylamino)-acetic acid ethyl ester (0.38 g, 1.5 mmol) in 10% HCl (7 mL) was refluxed for 4 h. Water was removed under reduced pressure and the resulting solids were collected by filtration, washed with ether, and dried in vacuo to afford 0.33 g (84%) of the title compound as its hydrochloride salt. 1H-NMR (400 MHz, DMSO-d6) δ: 7.26 (d, 1H), 6.75 (d, 1H), 6.56 (d, 1H), 5.85 (brs, 2–3H), 3.83 (s, 2H).

1. temperaturewas refluxed for 4 h
2. customWater was removed under reduced pressure
3. filtrationthe resulting solids were collected by filtration
4. washwashed with ether
5. customdried in vacuo