[CH2:1]([O:8][C:9]([NH:11][CH2:12][C:13]1[CH:18]=[CH:17][C:16]([O:19][CH3:20])=[C:15]([OH:21])[CH:14]=1)=[O:10])[C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1.C(=O)([O-])[O-].[K+].[K+].[CH2:28]([CH:30]1[O:32][CH2:31]1)Br>CN(C)C=O>[CH2:1]([O:8][C:9]([NH:11][CH2:12][C:13]1[CH:18]=[CH:17][C:16]([O:19][CH3:20])=[C:15]([O:21][CH2:28][CH:30]2[O:32][CH2:31]2)[CH:14]=1)=[O:10])[C:2]1[CH:3]=[CH:4][CH:5]=[CH:6][CH:7]=1A mixture comprising 2 g of N-benzyloxycarbonyl-3-hydroxy-4-methoxybenzylamine, 20 ml of dimethylformamide, 1.4 g of potassium carbonate and 1.4 g of epibromohydrin, was stirred at 60° C. overnight. After distilling off the solvent under reduced pressure, the reaction mixture was extracted with ethyl acetate. The obtained organic layer was washed sequentially with an aqueous potassium carbonate solution and with a saturated sodium chloride aqueous solution and then dried over anhydrous sodium sulfate. Then, the solvent was distilled off to obtain 2.6 g of the above-identified compound as oily substance.
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