[CH3:1][C:2]1([CH3:23])[CH:5]([OH:6])[C:4]([C:7]2[CH:12]=[CH:11][CH:10]=[CH:9][CH:8]=2)=[C:3]1[C:13]1[CH:18]=[CH:17][C:16]([S:19]([CH3:22])(=[O:21])=[O:20])=[CH:15][CH:14]=1.[CH2:24](Cl)Cl>[Ag]=O>[CH3:1][C:2]1([CH3:23])[CH:5]([O:6][CH3:24])[C:4]([C:7]2[CH:8]=[CH:9][CH:10]=[CH:11][CH:12]=2)=[C:3]1[C:13]1[CH:14]=[CH:15][C:16]([S:19]([CH3:22])(=[O:21])=[O:20])=[CH:17][CH:18]=1To a solution of Example 62 (70 mg) in CH2Cl2 (1 mL) at r.t., was added silver oxide (100 mg) and Mel (1 mL). The mixture was stirred reflux for 18 hr, cooled to r.t., filtered through celite® and the solvents evaporated. The residue was purified by flash chromatography (silica gel; hexane/EtOAc (85:15)) to give the title product as a white solid, m.p. 130°-132° C.
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