反应详情

Sodium acetate (6.14 g, 74.8 mmol), Pd/C (0.65 g, 1 mmol), and platinum (II) oxide (45 mg, 1 mmol) were placed in a dried Parr bottle equipped with nitrogen inlet. A small amount of acetic acid was added to wet the catalysts. A solution of 6-methyl-2-oxo-4-(phenylmethyl)-1,2-dihydro-3-pyridinecarbonitrile and 4-methyl-2-oxo-6-(phenylmethyl)-1,2-dihydro-3-pyridinecarbonitrile (6 g, 26.7 mmol) in acetic acid (300 mL) was added to the vessel. The contents were sealed and hydrogenated on Parr shaker at 45 psi for 12 h. The reaction mixture was filtered and washed with acetic acid. The filtrate was removed under reduced pressure. The residue was washed with methanol and filtered to afford a crude mixture of 3-(aminomethyl)-6-methyl-4-(phenylmethyl)-2(1H)-pyridinone and 3-(aminomethyl)-4-methyl-6-(phenylmethyl)-2(1H)-pyridinone. The reaction was run in duplicate to afford a total crude recovery of 14.5 g. To a solution of the above crude product mixture (4.0 g, 17.5 mmol) in THF (10 mL) and DMF (10 mL) was added di-tert-butoxycarbonyl anhydride (5.0 g, 23.4 mmoL) and triethylamine (5.2 g, 52.5 mmol) at 0° C. The reaction mixture was stirred with warming to room temperature and then stirred for an additional 4 h. The contents were diluted with ice water and then filtered. The collected solid was dried and the products separated by HPLC to furnish 1.2 g of 1,1-dimethylethyl {[4-methyl-2-oxo-6-(phenylmethyl)-1,2-dihydro-3-pyridinyl]methyl}carbamate (1H NMR (400 MHz, DMSO-d6) δ 11.55-1.60 (br s, 1H), 7.20-7.29 (m, 5H), 5.85 (s, 1H), 3.92 (s, 2H), 3.90 (s, 2H), 2.10 (s, 3H), 1.32 (s, 9H) and 1.0 g of 1,1-dimethylethyl {[6-methyl-2-oxo-4-(phenylmethyl)-1,2-dihydro-3-pyridinyl]methyl}carbamate (1H NMR (400 MHz, DMSO-d6) δ 11.50-11.55 (br s, 1H), 7.18-7.25 (m, 5H), 5.75 (s, 1H), 4.02 (s, 2H), 3.85 (s, 2H), 2.05 (s, 3H), 1.32 (s, 9H).

1. customequipped with nitrogen inlet
2. customThe contents were sealed
3. filtrationThe reaction mixture was filtered
4. washwashed with acetic acid
5. customThe filtrate was removed under reduced pressure
6. washThe residue was washed with methanol
7. filtrationfiltered
8. customto afford a crude
9. customto afford a total crude recovery of 14.5 g
10. stirringstirred for an additional 4 h
11. filtrationfiltered
12. customThe collected solid was dried
13. customthe products separated by HPLC