[H-].[Na+].[F:3][C:4]1[CH:9]=[CH:8][C:7]([CH2:10][C:11]([OH:13])=[O:12])=[C:6]([OH:14])[CH:5]=1.[CH3:15][S:16]([C:19]1[CH:24]=[CH:23][C:22](F)=[C:21]([Cl:26])[CH:20]=1)(=[O:18])=[O:17]>CN(C=O)C>[Cl:26][C:21]1[CH:20]=[C:19]([S:16]([CH3:15])(=[O:18])=[O:17])[CH:24]=[CH:23][C:22]=1[O:14][C:6]1[CH:5]=[C:4]([F:3])[CH:9]=[CH:8][C:7]=1[CH2:10][C:11]([OH:13])=[O:12]Sodium hydride (60% wt. disp. oil, 0.176 g) was added to a solution of the product from step (vi) (0.34 g) in dry DMF (10 ml) and stirred at RT for 1 h before adding the product from example 3 step (vii) (0.416 g). The mixture was heated at 80° C. for 1 h, then partitioned between 2M hydrochloric acid/ethyl acetate. The organics were dried, evaporated under reduced pressure and the residue purified by reverse phase HPLC. Yield 0.064 g
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