[Br:1][C:2]1[CH:3]=[C:4]([C:8]([CH3:14])([CH3:13])[C:9]([O:11]C)=[O:10])[CH:5]=[CH:6][CH:7]=1.[Li+].[OH-]>C1COCC1.CO>[Br:1][C:2]1[CH:3]=[C:4]([C:8]([CH3:14])([CH3:13])[C:9]([OH:11])=[O:10])[CH:5]=[CH:6][CH:7]=1To a Solution of ester from step 1 in THF-MeOH (4:1, 0.5M) was added LiOH (3 eq, 2M) and the mixture was stirred at 50° C. for 1 h. The organic solvent evaporated, aqueous was acidified with HCl 1N and the acid extracted with EtOAc (3×). The organic was washed with brine, dried and solvent evaporated to afford the acid.
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