Hydrochloric Acid → 2-(5-bromopyridin-3-yl)-1H-indole

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Reaction Steps

2-(5-Bromo-pyridin-3-yl)-indole-1-carboxylic acid tert-butyl ester (320 mg, 0.86 mmol) is added into 4.0 M HCl in EtOAc (10 mL) and the solution is stirred at room temperature for 16 hrs. The solvent is evaporated and the residue is dissolved in water and saturated aqueous NaHCO3 solution is used to adjusted the pH to 9-10. Then the mixture is extracted with DCM for three times. The organic layers are combined, dried over Na2SO4, filtered and concentrated to give 192 mg of the crude 2-(5-bromo-pyridin-3-yl)-1H-indole which is used in the next step directly.

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