反应详情

To a dried 500 mL Parr bottle equipped with nitrogen inlet were placed sodium acetate (1.502 g, 18.30 mmol), 10% palladium on carbon (1.579 g, 0.742 mmol), platinum(IV) oxide (0.011 g, 0.049 mmol) and a small amount of acetic acid to wet the catalysts under nitrogen stream. Next added 2-hydroxy-6-methyl-4-(trifluoromethyl)-3-pyridinecarbonitrile (2.0 g, 9.89 mmol) followed by acetic acid (175 mL) while under nitrogen atmosphere. The contents were sealed, placed on a Parr shaker, and reacted at 40 psi of H2 for ca. 6 hr., keeping the H2 psi between 20 and 40 psi (vessel was refilled twice). The vessel was purged with nitrogen and the reaction mixture filtered through Celite, and the filter pad was further washed with a small amount of acetic acid. The volatiles were removed in vacuo to afford a residue, which was dried under hi-vacuum for 45 min. The solid was suspended in conc. HCl (12 mL), stirred, and filtered (removed NaCl). The clear filtrate was concentrated in vacuo and the residue dried under hi-vacuum. The collected solid was suspended in conc. HCl (2 mL) and diluted with EtOH (13 mL). The contents were agitated (i.e. spatula) and stored at ca. 0° C. (i.e. freezer) for 30 min to give a white solid. The solid was filtered and washed with cold ethanol (5 mL). The solid was filtered and dried in vacuum oven for 1 h. The final product was collected as 0.95 g (40%). LCMS E-S (M+H)=206.9. 1H NMR (400 MHz, DMSO-d6) δ ppm 2.31 (s, 3H), 3.87 (d, J=5.05 Hz, 2H), 6.41 (s, 1H), 8.12-8.37 (m, 3H).

1. customTo a dried 500 mL Parr bottle equipped with nitrogen inlet
2. customThe contents were sealed
3. customreacted at 40 psi of H2 for ca. 6 hr
4. additionwas refilled twice)
5. customThe vessel was purged with nitrogen
6. filtrationthe reaction mixture filtered through Celite
7. washthe filter pad was further washed with a small amount of acetic acid
8. customThe volatiles were removed in vacuo
9. customto afford a residue, which
10. customwas dried under hi-vacuum for 45 min
11. filtrationfiltered
12. custom(removed NaCl)
13. concentrationThe clear filtrate was concentrated in vacuo
14. customthe residue dried under hi-vacuum
15. additiondiluted with EtOH (13 mL)
16. stirringThe contents were agitated (i.e. spatula)
17. customstored at ca. 0° C.
18. customfor 30 min
19. customto give a white solid
20. filtrationThe solid was filtered
21. washwashed with cold ethanol (5 mL)
22. filtrationThe solid was filtered
23. customdried in vacuum oven for 1 h
24. customThe final product was collected as 0.95 g (40%)