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0 °C

To a solution of (E)-ethyl 3-(4-((6-methoxy-2-(4-methoxyphenyl)-benzo[b]thiophen-3-yl)oxy)phenyl)-2-methylacrylate (107 mg, 0.225 mmol) in DCM (5.0 mL) at 0° C. was added BBr3 (1.0 M in DCM, 0.902 mL, 0.902 mmol) dropwise. The resulting mixture was stirred at 0° C. for 100 min after which the reaction was quenched by addition of sat. aq. NaHCO3 (4 mL) and acidified to pH 3 by addition of concentrated HCl. The aqueous layer was then extracted with 5% MeOH/EtOAc (4×12 mL) and the combined organic layers were passed through a phase separator to remove water and concentrated in vacuo to afford the crude product which was dissolved in MeOH and purified by reverse phase HPLC (neutral condition, 3% 1-propanol in 1-100% CH3CN/H2O) to afford (E)-3-(4-((6-hydroxy-2-(4-hydroxyphenyl)-benzo[b]thiophen-3-yl)oxy)phenyl)-2-methylacrylic acid (32.4 mg, 0.078 mmol, 34% yield). HRMS (m/z, MH+): 419.0872.

1. customwas quenched by addition of sat. aq. NaHCO3 (4 mL)
2. additionacidified to pH 3 by addition of concentrated HCl
3. extractionThe aqueous layer was then extracted with 5% MeOH/EtOAc (4×12 mL)
4. customto remove water
5. concentrationconcentrated in vacuo
6. customto afford the crude product which
7. custompurified by reverse phase HPLC (neutral condition, 3% 1-propanol in 1-100% CH3CN/H2O)