[CH2:1]([O:3][C:4]1[CH:5]=[C:6]([NH:15][C:16](=[O:21])[O:17][CH:18]([CH3:20])[CH3:19])[CH:7]=[C:8]([CH:13]=O)[C:9]=1[O:10][CH2:11][CH3:12])[CH3:2].[OH-].[Na+].Cl.[CH3:25][O:26][NH2:27]>C(O)C>[CH2:1]([O:3][C:4]1[CH:5]=[C:6]([NH:15][C:16](=[O:21])[O:17][CH:18]([CH3:20])[CH3:19])[CH:7]=[C:8]([CH:13]=[N:27][O:26][CH3:25])[C:9]=1[O:10][CH2:11][CH3:12])[CH3:2]Isopropyl N-(3,4-diethoxy-5-formylphenyl)carbamate (0.6 g) was dissolved in ethanol (20 ml). To the solution was added an aqueous solution (10 ml) containing sodium hydroxide (0.32 g) and methoxyamine hydrochloride (0.66 g). After being allowed to stand for 12 hours, the reaction mixture was concentrated in vacuo, and the residue was dissolved in ethyl acetate. The resultant solution was washed with water, dried over magnesium sulfate and concentrated under reduced pressure. The residue was washed with hexane to give isopropyl N-(3,4-diethoxy-5-methoxyiminomethylphenyl)carbamate (Compound No. 191) (0.61 g) in a yield of 93%. M.P., 110°-111.5° C.
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