反应详情

Methyl 2-(2-(trifluoromethyl)benzyl)isonicotinate (4.613 g, 15.62 mmol) was dissolved in acetic acid (40 mL) and platinum(IV) oxide (0.26 g, 1.14 mmol) added. The resulting mixture was hydrogenated in a Büchi hydrogenator for 3 h at room temperature and 5 bar. More platinum(IV) oxide (160 mg) was added and the hydrogenation continued at room temperature at 5 bar for 2 h. The catalyst was filtered off and washed with MeOH and the eluate evaporated. DCM and 10% K2CO3 were added and the phases separated. The water phase was extracted with DCM and the combined organic phase washed with water, passed through a phase separator and evaporated to yield methyl 2-(2-(trifluoromethyl)benzyl)-piperidine-4-carboxylate (4.20 g, 89%) as a yellow oil. MS m/z 302 (M+H)+

1. waitthe hydrogenation continued at room temperature at 5 bar for 2 h
2. filtrationThe catalyst was filtered off
3. washwashed with MeOH
4. additionDCM and 10% K2CO3 were added
5. customthe phases separated
6. extractionThe water phase was extracted with DCM
7. washthe combined organic phase washed with water
8. customevaporated