Tetrahydrofuran → 3-(3-amino-2,6-difluoro-benzoyl)-4-chloro-1H-pyrrolo[2,3-b]pyridine-5-carbonitrile

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Reaction Conditions

Reaction Steps

In a round bottom flask, 4-chloro-3-(2,6-difluoro-3-nitro-benzoyl)-1H-pyrrolo[2,3-b]pyridine-5-carbonitrile (51, 0.15 g, 0.42 mmol) in 10 mL of ethanol and 10 mL of tetrhydrofuran, tin(II) chloride (0.1 mL, 2.1 mmol) is added. An additional 10 mL of tetrahydrofuran is added to give a clear solution, and the reaction is heated at 60° C. for 24 hours. The reaction is combined with 10 mL of water and 10 mL of saturated aqueous sodium bicarbonate and 20 mL of ethyl acetate is added. Celite is added with mixing, and then filtered. Brine is added to the filtrate and the layers are separated. The organic layer is washed with water, brine, dried with magenesium sulfate, filtered and the filtrate is concentrated under vacuum. The resulting material is purified by silica gel column chromatography, eluting with 0-80% ethyl acetate in hexane. Appropriate fractions are combined and concentrated under vacuum to provide the desired compound (52, 123 mg). MS (ESI) [M+H+]+=332.8 and 334.8.

Provenance & Evidence