反应详情

To a solution of methyl 3-amino-5-(4-morpholinyl)-2-nitrobenzoate (22 g) stirring at reflux in HOAc (400 mL) was added iron powder in portions (13 g). After the addition, the mixture was stirred at reflux for 5 h. It was cooled to room temperature and the solvent was removed in-vacuo. The residue was neutralized with aqueous Na2CO3 solution (1 L). It was extracted with EtOAc (500 mL×3). The combined organic layers were then concentrated in-vacuo and the residue was purified by silica gel chromatography eluted with MeOH:DCM=1:30 to afford the desired product as a solid (16.6 g, yield 77%). 1H NMR (300 MHz, CDCl3): δ ppm 2.67 (s, 3H), 3.17 (t, 4H, J=4.8 Hz), 3.90 (t, 4H, J=4.8 Hz), 3.98 (s, 3H), 7.44 (d, 1H, J=1.8 Hz), 7.54 (d, 1H, J=1.8 Hz); LC-MS: m/e=276 [M+1]+.

1. additionAfter the addition
2. temperatureat reflux for 5 h
3. customthe solvent was removed in-vacuo
4. extractionIt was extracted with EtOAc (500 mL×3)
5. concentrationThe combined organic layers were then concentrated in-vacuo
6. customthe residue was purified by silica gel chromatography
7. washeluted with MeOH