反应详情

To a solution of methyl-3-cyano-2-(methoxycarbonyl)benzoate (12.3 g, 57 mmol) in methanol (250 ml) and 4N HCl (40 ml) was added 10% Pd/C (1.2 g). The mixture was hydrogenated under 50 psi of hydrogen in a Parr Type Shaker for 17 hours. The mixture was filtered through Celite and the filtrate was concentrated in vacuo. The residue was further evaporated with ethanol (2×25 ml) and toluene (25 ml) and dried under vacuum. The resulting solid was slurried in ether (50 ml) for 1 hour. The slurry was then filtered and dried to give 13.46 g (90%) of the product as a white solid: 1H NMR (DMSO-d6) δ 8.79 (b, 2H), 7.94 (d, J=7.8 Hz, 1H), 7.88 (d, J=7.7 Hz, 1H), 7.72 (t, J=7.7 Hz, 1H), 4.03 (s, 2H), 3.86 (s, 3H), 3.85 (s, 3H); 13C NMR (DMSO-d6) δ 167.58, 166.12, 133.41, 133.18, 132.28, 130.62, 129.49, 52.99, 52.92, 39.25.

1. filtrationThe mixture was filtered through Celite
2. concentrationthe filtrate was concentrated in vacuo
3. customThe residue was further evaporated with ethanol (2×25 ml) and toluene (25 ml)
4. customdried under vacuum
5. filtrationThe slurry was then filtered
6. customdried