[C:1]1([S:7]([O:10][C:11]2[CH:16]=[CH:15][C:14]([S:17][CH2:18][C:19]#[CH:20])=[CH:13][CH:12]=2)(=[O:9])=[O:8])[CH:6]=[CH:5][CH:4]=[CH:3][CH:2]=1.O.O.C1(C)C=CC(S(O)(=O)=[O:30])=CC=1>COCCOC>[C:1]1([S:7]([O:10][C:11]2[CH:12]=[CH:13][C:14]3[S:17][CH:18]=[C:19]([CH2:20][OH:30])[C:15]=3[CH:16]=2)(=[O:9])=[O:8])[CH:2]=[CH:3][CH:4]=[CH:5][CH:6]=1The compound (3) (65.47 g, 183 mmol) obtained in above (2) was dissolved in 1,2-dimethoxyethane (1.6 L) and the solution was refluxed for 4 hours. To the solution were added water (64 ml) and p-toluenesulfonic acid monohydrate (19.2 g, 100 mmol) and refluxing was continued for 2 hours. The reaction mixture was concentrated under reduced pressure. After water (200 ml) was added to the resulting oil, the mixture was extracted with ethyl acetate (300 ml). The organic layer was washed with aqueous sodium hydrogen carbonate and water, dried over anhydrous magnesium sulfate and then the solvent was distilled off under reduced pressure to provide 60.18 g of the title compound (4) as oil. Crude yield: 103%.
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