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A −78° C. solution of 6-bromo-benzo[b]thiophene-2-carboxylic acid ethyl ester (5.75 g; 20.2 mmol) in THF (200 mL) is treated with diisobutylaluminum hydride (50.4 mL; 1.0 M) dropwise. The mixture is stirred at 0° C. for 10 minutes and quenched with HCl (1 M, 50 mL). The mixture is extracted with EtOAc (150 mL). The organic layer is dried over Na2SO4, filtered, and concentrated under reduced pressure. The crude product is purified via flash chromatography eluting with 25% EtOAc/Hexanes. The appropriate fractions are combined and concentrated under reduced pressure to afford the title compound (2.92 g, 60%). 1H NMR (400 MHz, CDCl3): δ 7.95 (s, 1H), 7.68 (d, 1H), 7.42 (d, 1H), 7.18 (s, 1H), 4.90 (s, 2H).

1. customquenched with HCl (1 M, 50 mL)
2. extractionThe mixture is extracted with EtOAc (150 mL)
3. dry with materialThe organic layer is dried over Na2SO4
4. filtrationfiltered
5. concentrationconcentrated under reduced pressure
6. customThe crude product is purified via flash chromatography
7. washeluting with 25% EtOAc/Hexanes
8. concentrationconcentrated under reduced pressure