反应详情

A mixture of combined batches of methyl 3-amino-5-chloro-2-nitrobenzoate (39 g), morpholine (29.5 g) and K2CO3 (47 g) was stirred in DMF (200 ml) at 110° C. for 5 h. The mixture was cooled to room temperature and poured into water (1 L). It was extracted with EtOAc (500 mL×3). The combined organic layers were washed with brine, dried over anhydrous Na2SO4, filtered and concentrated in-vacuo to afford the desired product as a yellow solid (22 g, yield 46%). 1H NMR (300 MHz, CDCl3): δ ppm 3.31 (t, 4H, J=4.8 Hz), 3.82 (t, 4H, J=4.8 Hz), 3.89 (s, 3H), 6.03 (d, 1H, J=2.4 Hz), 6.34 (d, 1H, J=2.4 Hz); LC-MS: m/e=282 [M+1]+.

1. extractionIt was extracted with EtOAc (500 mL×3)
2. washThe combined organic layers were washed with brine
3. dry with materialdried over anhydrous Na2SO4
4. filtrationfiltered
5. concentrationconcentrated in-vacuo