[C:1]1([CH2:7][O:8][N:9]([CH2:18][C@@H:19]2[O:23][CH2:22][C@@H:21]([S:24][C:25](=[O:27])[CH3:26])[CH2:20]2)[C:10](OCC(Cl)(Cl)Cl)=[O:11])[CH:6]=[CH:5][CH:4]=[CH:3][CH:2]=1.[C:28](OC(=O)C)(=O)C>C(O)(=O)C.C(OCC)(=O)C.[Zn]>[C:10]([N:9]([CH2:18][C@@H:19]1[O:23][CH2:22][C@@H:21]([S:24][C:25](=[O:27])[CH3:26])[CH2:20]1)[O:8][CH2:7][C:1]1[CH:6]=[CH:5][CH:4]=[CH:3][CH:2]=1)(=[O:11])[CH3:28]To a room temperature solution, under argon, of 0.188 g of product from Example 71 in 2.3 ml of glacial acetic acid is added 0.269 g of zinc dust.The reaction is stirred 10 minutes and 155 microliter of acetic anhydride is added. The reaction is stirred at room temperature overnight, diluted with ethyl acetate and filtered. The filtrate is concentrated in vacuo to give 0.110 g of the desired product.
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