1: diethyl ether / 0 °C 2: Et3N, 4-(dimethylamino)pyridine, 3,5-dinitrobenzoyl chloride / CH2Cl2 / 4 h / Ambient temperature View Scheme

4-(N,N-dimethlyamino)pyridine; triethylamine; 3,5-dinitrobenzoic acid chloride in dichloromethane 4 h; Ambient temperature; Title compound not separated from byproducts;

4-(N,N-dimethlyamino)pyridine; triethylamine in dichloromethane 4 h; Ambient temperature;