Trifluoroacetic acid → 3-Chloro-5-fluoro-4-(1,2,3,6-tetrahydropyridin-4-yl)pyridine

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Reaction Steps

TFA (2 mL, 25.96 mmol) was added to a stirred solution of tert-butyl 4-(3-chloro-5-fluoro-4-pyridyl)-3,6-dihydro-2H-pyridine-1-carboxylate (708 mg, 2.264 mmol) in DCM (10 mL) and the reaction stirred at ambient temperature for 2 hours. The solvent was removed in vacuo and the residue azeotroped with DCM (×2) and ether (×2). The residue was passed through a 10 g SCX-2 cartridge and washed with MeOH/DCM mixtures. The product was eluted by washing the cartridge with 2M NH3 in MeOH/DCM mixtures and concentrated in vacuo to give 3′-chloro-5′-fluoro-1,2,3,6-tetrahydro-4,4′-bipyridine as an off-white solid (468 mg, 97% Yield). MS (ES+) 213.1.

Provenance & Evidence