[S:1](Cl)(Cl)=[O:2].O[C@:6]1([C:16]([O:18][CH3:19])=[O:17])[CH2:11][C@@H:10]([CH:12]=[CH2:13])[C@H:9]([OH:14])[C@H:8]([OH:15])[CH2:7]1.C(N(CC)CC)C>ClCCl>[CH:12]([C@H:10]1[C@@H:9]2[O:14][S:1](=[O:2])[O:15][C@@H:8]2[CH:7]=[C:6]([C:16]([O:18][CH3:19])=[O:17])[CH2:11]1)=[CH2:13]Thionyl chloride can be added dropwise to a 0° C. solution of Example 17F and triethylamine in dichloromethane. After stirring for 30 minutes, the reaction mixture can be washed with saturated NaHCO3 solution, and brine, dried (MgSO4) filtered and concentrated to afford the crude desired product.
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