[CH3:1][O:2][C:3]1[CH:9]=[CH:8][C:7]([O:10][C:11](=[O:13])[CH3:12])=[CH:6][C:4]=1[NH2:5].[CH3:14][O:15][CH:16]([O:21][CH3:22])[CH2:17][C:18](O)=[O:19].C1CCC(N=C=NC2CCCCC2)CC1>C(Cl)Cl>[CH3:14][O:15][CH:16]([O:21][CH3:22])[CH2:17][C:18]([NH:5][C:4]1[CH:6]=[C:7]([O:10][C:11](=[O:13])[CH3:12])[CH:8]=[CH:9][C:3]=1[O:2][CH3:1])=[O:19]To a cooled solution (0° C.) of 2-methoxy-5-acetyloxy-aniline (5 g, 0.0276 mole), 3,3-dimethoxy-propanoic acid (5 g, 0.0373 mole) in 75 ml of methylene chloride was added DCC (5.7 g, 0.0276 mole) in 20 ml of methylene chloride. After completion of the addition, the solution was stirred for a further 4 hours. The reaction medium was concentrated to 25 ml, diluted with 200 ml of isopropyl ether, cooled to 5° C. and the resulting precipitate was isolated by filtration, giving N-(3,3-dimethoxypropanoyl)-2-methoxy-5-acetoxy-aniline 7.7 g (Yield=95%).
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