CCN(CC)CC.Cl.[NH2:9][CH2:10][C:11]([C:13]1[CH:18]=[CH:17][C:16]([N+:19]([O-:21])=[O:20])=[CH:15][CH:14]=1)=[O:12].[CH2:22]([O:24][C:25](=[O:29])[C:26](Cl)=[O:27])[CH3:23]>CCOC(C)=O>[N+:19]([C:16]1[CH:15]=[CH:14][C:13]([C:11](=[O:12])[CH2:10][NH:9][C:26](=[O:27])[C:25]([O:24][CH2:22][CH3:23])=[O:29])=[CH:18][CH:17]=1)([O-:21])=[O:20]Et3N (8.88 ml) was added to a solution of 2-amino-1-(4-nitrophenyl)ethanone hydrochloride (step B product, 11.5 g) in EtOAc (115 ml). This was followed by drop wise addition of Ethylchlorooxoacetate (7.11 ml). The reaction mixture was refluxed for 2 hours. It was then cooled and quenched with water. The organic layer was separated, dried over Na2SO4 and the solvent was concentrated to get dark brown oil which was purified by column chromatography in 3:7 Ethyl acetate:Pet ether to get yellow solid. The solid was crystallized in ethyl acetate/pet ether to yield 8.9 g (59%) of the title compound. 1HNMR (DMSO-d6, 300 MHz): δ 9.21 (t, 1H), 8.35 (d, 2H), 8.24 (d, 2H), 4.78 (d, 2H), 4.29 (q, 2H), 1.29 (t, 3H).
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