Thiophene, 2,3,5-tribromo- → 3-Bromo-2,5-bis(3',4'-dimethoxyphenyl)thiophene

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3-bromo-2,5-bis(3′,4′-dimethoxyphenyl)thiophene (18) was prepared by the reaction of 2,3,5-tribromothiophene (17) (321 mg, 1 mmol) and (3,4-dimethoxyphenyl)boronic acid (15) (419 mg, 2.3 mmol) according to the similar procedure for compound 16. The reaction mixture was purified by column chromatography (10%-30% EtOAc in hexanes) and afforded 18 (337 mg, 77% yield) as a yellow solid. SA-60 was also isolated (97 mg, 20% yield) from the reaction above as a dark yellow solid.

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