Tetrabutylammonium Fluoride → 4-{2-Cyano-5-[5-(4-hydroxy-piperidin-1-yl)-3H-imidazo[4,5-b]pyridine-2-carbonyl]-phenyl}-pyrrolo[2,3-c]pyridine-1-carboxylic acid tert-butyl ester

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Reaction Steps

To a solution of 4-(5-{5-[4-(tert-Butyl-diphenyl-silanyloxy)-piperidin-1-yl]-3H-imidazo[4,5-b]pyridine-2-carbonyl}-2-cyano-phenyl)-pyrrolo[2,3-c]pyridine-1-carboxylic acid tert-butyl ester in THF (0.2M) was added a 1M TBAF in THF solution at 23° C. After 24 hr, the reaction was quenched with sat'd NaHCO3 and extracted with EtOAc (3×), the combined organics washed with brine, dried over Na2SO4, filtered, and concentrated to a red solid. The crude was purified using chromatography eluting with MeOH/DCM mixtures giving 4-{2-Cyano-5-[5-(4-hydroxy-piperidin-1-yl)-3H-imidazo[4,5-b]pyridine-2-carbonyl]-phenyl}-pyrrolo[2,3-c]pyridine-1-carboxylic acid tert-butyl ester as a red-orange solid (420 mg, 0.738 mmol, 66%). MS ESI m/z 564.5 (M+H)+.

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