反应详情

温度

65 °C

Compound 26 (100 mg, 0.369 mmol) was added to concentrated sulfuric acid (1 mL) and heated to 65° C. for 3 hours. Afterwards, the reaction mixture was poured into ice water and the pH was brought to 14 with 10 M NaOH. The aqueous material was extracted several times with dichloromethane. The combined organic layers were dried over MgSO4, filtered and concentrated to a solid (91 mg, 85% yield): 1H NMR (400 MHz, DMSO) δ 8.32 (s, 1H), 8.21 (d, J=8.2, 1H), 7.98 (d, J=7.7, 1H), 7.69 (t, J=8.0, 1H), 6.20 (br, 2H), 4.51 (hept, 1H), 1.35 (d, J=6.5, 6H); 13C NMR (100 MHz, DMSO) δ 166.17, 149.37, 147.65, 145.50, 135.63, 134.92, 129.69, 122.79, 122.43, 95.43, 47.11, 21.50; [M+H]+ calculated for C13H15N5O3 290.1, found 290.0.

1. extractionThe aqueous material was extracted several times with dichloromethane
2. dry with materialThe combined organic layers were dried over MgSO4
3. filtrationfiltered