Citric Acid → (5-Aminopyridin-3-yl){7-[(1S)-2-{[tert-butyl(dimethyl)silyl]oxy}-1-methylethyl]-7H-pyrrolo[2,3-d]pyrimidin-5-yl}methanone

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Reaction Steps

Aqueous citric acid (120 mL, 2.0 M) was added to {7-[(1S)-2-{[tert-butyl(dimethyl)silyl]oxy}-1-methylethyl]-7H-pyrrolo[2,3-d]pyrimidin-5-yl}{5-[(diphenylmethylene)amino]pyridin-3-yl}methanone (63.2 g, 110 mmol) (see Preparation 24) in THF (274 mL) and the mixture was stirred at room temperature for 17 hours. The mixture was cooled to 0°, water (200 mL) added and the mixture was basified using sodium hydroxide (28 g). The mixture was extracted with ethyl acetate (150 mL) then the aqueous phase was extracted with ethyl acetate (2×200 mL). The combined organic phases were washed with brine (600 mL), dried over sodium sulfate and evaporated in vacuo to afford the title compound as a semi-solid in quantitative yield, 45.2 g.

Provenance & Evidence