反应详情

A mixture of tert-butyl 4-(5-chloro-2-(trifluoromethyl)phenyl)-5,6-dihydropyridine-1(2H)-carboxylate (0.614 g, 1.70 mmol), platinum oxide (0.200 g, 0.881 mmol), acetic acid (1 mL), and ethyl acetate (15 mL) was hydrogenated using a balloon of H2 for 16 h and filtered. After concentration, the residue was chromatographed over silica gel (0-30% EtOAc in hexanes) to give tert-butyl 4-(5-chloro-2-(trifluoromethyl)phenyl)piperidine-1-carboxylate as colorless thick oil (0.302 g, 48%): 1H NMR (300 MHz, CDCl3) δ 7.56 (d, J=8.5 Hz, 1H), 7.38 (s, 1H), 7.29 (d, J=1.3 Hz, 1H), 4.26 (br, 2H), 3.04 (m, 1H), 2.80 (m, 2H), 1.80-1.55 (m, 4H), 1.49 (s, 9H); MS (ESI+) m/z 308 [M+H]+.

1. customfor 16 h
2. filtrationfiltered
3. concentrationAfter concentration
4. customthe residue was chromatographed over silica gel (0-30% EtOAc in hexanes)