[CH2:1]([O:8][C:9]1[CH:18]=[CH:17][CH:16]=[C:15]2[C:10]=1[CH2:11][CH2:12][CH:13]([C:20]([O:22][CH3:23])=[O:21])[CH:14]2O)[C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1.C1(C)C=CC(S(Cl)(=O)=O)=CC=1>N1C=CC=CC=1>[CH2:1]([O:8][C:9]1[CH:18]=[CH:17][CH:16]=[C:15]2[C:10]=1[CH2:11][CH2:12][C:13]([C:20]([O:22][CH3:23])=[O:21])=[CH:14]2)[C:2]1[CH:3]=[CH:4][CH:5]=[CH:6][CH:7]=1To a solution of 5.96 g of 5-(benzyloxy)-1-hydroxy-2-(methoxycarbonyl)-1,2,3,4-tetrahydronaphthalene in 23 ml of anhydrous pyridine, 4.37 g of p-toluenesulfonyl chloride was added. After stirring with heating at 70° C. for 3 hours, 0.72 g of p-toluenesulfonyl chloride was further added, followed by stirring for 1.5 hours. The reaction solution was extracted with diethyl ether after adding iced water. The extract was washed in turn with water, 10% hydrochloric acid, water and an aqueous saturated sodium hydrogen carbonate solution and dried over anhydrous magnesium sulfate, the solvent was evaporated under reduced pressure. The residue was purified by silica gel column chromatography to obtain 2.79 g of the desired compound as a colorless crystal having a melting point of 64 to 67° C.
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