[CH2:1]([O:3][C:4]1[CH:5]=[C:6]([NH:13][C:14](=[O:19])[O:15][CH:16]([CH3:18])[CH3:17])[CH:7]=[CH:8][C:9]=1[O:10][CH2:11][CH3:12])[CH3:2].[H-].[Na+].[C:22](Cl)(=[O:29])[C:23]1[CH:28]=[CH:27][CH:26]=[CH:25][CH:24]=1>CN(C)C=O>[C:22]([N:13]([C:6]1[CH:7]=[CH:8][C:9]([O:10][CH2:11][CH3:12])=[C:4]([O:3][CH2:1][CH3:2])[CH:5]=1)[C:14](=[O:19])[O:15][CH:16]([CH3:17])[CH3:18])(=[O:29])[C:23]1[CH:28]=[CH:27][CH:26]=[CH:25][CH:24]=1Isopropyl N-(3,4-diethoxyphenyl)carbamate (2.7 g) was dissolved in dimethylformamide (50 ml), and sodium hydride dispersion (50%, 0.5 g) was added thereto. The mixture was heated at 60° C. for 15 minutes, treated with benzoyl chloride (1.4 g) and heated for 30 minutes. The reaction mixture was poured into ice-water and extracted with ether. The extract was washed with sodium bicarbonate solution and saturated brine, dried over anhydrous magnesium sulfate and concentrated under reduced pressure. The residue was purified by silica gel chromatography using hexane-acetone as the eluent to give isopropyl N-benzoyl-N-(3,4-diethoxyphenyl)carbamate (Compound No. 99) (3.1 g) in a yield of 80%. M.P., 120°-121° C.
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