Trifluoroacetic acid → 6-Bromo-2-phenylimidazo[1,2-A]pyridin-7-amine

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Reaction Steps

Trifluoroacetic acid (15 ml) was added to a solution of (6-bromo-2-phenyl-imidazo[1,2-a]pyridin-7-yl)-carbamic acid tert-butyl ester (2.75 g, 7.1 mmol) in CH2Cl2 (15 ml), and the mixture was stirred at r.t. overnight. The mixture was then washed (water, 2×50 ml), dried (Na2SO4), and the solvent was evaporated to give a first crop of the desired product. The water layer was made alkaline by addition of NaOH (conc. 14 ml), and extracted with dichloromethane. The combined organic layers were dried (Na2SO4) and evaporated to give a second crop of the desired product. The combined crops (2.02 g, 99%) were used in the next step without further purification. MS (m/e)=288.0 [M+H+].

Provenance & Evidence