Hydrochloric Acid → 4-(5-Fluoro-2-(trifluoromethyl)phenyl)-1,2,3,6-tetrahydropyridine hydrochloride

Participants

Reaction Steps

A mixture of tert-butyl 4-(5-fluoro-2-(trifluoromethyl)phenyl)-5,6-dihydropyridine-1(2H)-carboxylate (9, 0.542 g, 1.58 mmol) and HCl (2 N solution in Et2O, 10 mL) in CH2Cl2 (20 mL) stirred at ambient temperature for 18 h. The reaction mixture was diluted with Et2O (30 mL), and the resulting precipitate was collected by filtration to provide 4-(5-fluoro-2-(trifluoromethyl)phenyl)-1,2,3,6-tetrahydropyridine hydrochloride (10) as a white solid (0.393 g, 88%): 1H NMR (300 MHz, DMSO-d6) δ 9.26-9.00 (m, 2H), 7.84 (dd, J=8.7, 5.4 Hz, 1H), 7.46-7.36 (m, 1H), 7.24 (dd, J=9.3, 2.4 Hz, 1H), 5.67 (br s, 1H), 3.76-3.64 (m, 2H), 3.27 (t, J=5.1 Hz, 2H), 2.70-2.40 (m, 2H).

Provenance & Evidence