反应详情

To a solution of 3-methoxy-2-thiophene carboxylic acid (200 mg, 1.27 mmol) in benzene, (PhO)2PON3 (0.33 mL), 2-amino-4-nitrophenol (195.7 mg, 1.27 mmol) and triethylamine (1.1 equiv., 0.25 mL) were added. The reaction mixture was stirred at reflux overnight. The reaction mixture was partitioned between 5% citric acid and ethyl acetate. The organic layer was separated and the aqueous layer was extracted three times with ethyl acetate. The organic extracts were combined, dried over MgSO4, filtered and concentrated under reduced pressure. Chromatography of the resulting solid on silica gel (hexane:ethyl acetate;l: 1) gave a solid product (160 mg, 41%). mp: 172.6-173.0° C.; 1H NMR (CD3OD/CDCl3): d 8.96 (d, 1H, J=2.5 Hz), 7.74 (dd, 1H, J=5.0 Hz and J=1.25 Hz), 6.82 (d, 1H, J=7.5 Hz), 6.76 (s, 2H), 3.80 (s, 3H); EI-MS m/z 309 (M+H)+; Anal. (C12H11N3O5S) C, H, N.

1. temperatureat reflux overnight
2. customThe reaction mixture was partitioned between 5% citric acid and ethyl acetate
3. customThe organic layer was separated
4. extractionthe aqueous layer was extracted three times with ethyl acetate
5. dry with materialdried over MgSO4
6. filtrationfiltered
7. concentrationconcentrated under reduced pressure