Ammonia → 5-chloro-3-(2,6-difluoro-pyridin-3-ylmethyl)-1H-pyrrolo[2,3-b]pyridine

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Reaction Conditions

Reaction Steps

To 2,6-Difluoropyridine (58, 3.40 g, 0.0295 mol) in tetrahydrofuran (200.0 mL), under an atmosphere of nitrogen at −78° C., 2.50 M of n-butyllithium in hexane (12.0 mL) was added slowly. After 60 minutes, CuCN.2LiCl (0.75 M in tetrahydrofuran, 40.0 mL) was added to the reaction mixture. After 5 minutes, 5-chloro-3-chloromethyl-pyrrolo[2,3-b]pyridine-1-carboxylic acid tert-butyl ester (535, 4.20 g, 0.0139 mol, prepared as described in Example 49, Scheme 164) in tetrahydrofuran (20 mL) was added to the reaction. The reaction was stirred at −78° C. overnight, then poured into water and ammonia (10 mL), and extracted with ethyl acetate. The organic layer was dried over anhydrous sodium sulfate and filtered. The filtrate was concentrated and purified by silica gel column chromatography eluting with 15% ethyl acetate in hexane to give a white solid (P-0155, 300 mg, 7.7%). MS (ESI) [M−H+]−=278.1.

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