How is 4-(Ethylamino)-3-nitrobenzoic acid (CAS: 2788-74-1) typically synthesized?

4-(Ethylamino)-3-nitrobenzoic acid can be synthesized via the amination of 3-nitrobenzoic acid with ethylamine followed by a coupling reaction. Commonly, the synthesis involves the nitro group being reduced to an amino group using hydrazine or sodium borohydride, followed by the amination step. The reaction typically provides a yield of 70-80%, and the process requires mild conditions to prevent decomposition.