C1(C)C=CC=CC=1.[C:8]1([CH3:32])[CH:13]=[CH:12][C:11]([S:14]([O:17][CH2:18][C@H:19]([C:26]2[CH:31]=[CH:30][CH:29]=[CH:28][CH:27]=2)[O:20]C(OC)(C)C)(=[O:16])=[O:15])=[CH:10][CH:9]=1.O.C1(C)C=CC(S(O)(=O)=O)=CC=1>CO>[C:8]1([CH3:32])[CH:9]=[CH:10][C:11]([S:14]([O:17][CH2:18][C@H:19]([C:26]2[CH:27]=[CH:28][CH:29]=[CH:30][CH:31]=2)[OH:20])(=[O:16])=[O:15])=[CH:12][CH:13]=1Into toluene (10 ml) were added (S)-2-phenyl-2-(1-methoxy-1-methylethyloxy)ethyl p-toluenesulfonate (3.0 g), p-toluenesulfonic acid monohydrate (1.7 g) and methanol (0.5 g), and the resulting mixture was stirred at 50° C. for 1 hour. The reaction mixture was washed with a saturated aqueous sodium hydrogen carbonate solution, then with a saturated aqueous sodium chloride solution, and dried with anhydrous magnesium sulfate. The desiccant was filtered off and then the solvent was distilled off under reduced pressure to obtain a colorless oily compound mentioned above (2.1 g, 88.0%).
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