反应详情

To a stirred solution of Intermediate A (243 mg, 1.21 mmol) in 1,2-dichloroethane (8 mL) under inert atmosphere was added NCS (163 mg, 1.21 mmol) at RT and stirred for 1 h. To this, compound 2 (200 mg, 0.81 mmol) in 1,2-dichloroethane (2 mL) and NaHCO3 (204 mg, 2.45 mmol) were added at RT. After 24 h stirring at RT, the reaction mixture was diluted with water (15 mL) and extracted with EtOAc (2×30 mL). The combined organic extracts were washed with water (30 mL) and brine (30 mL), dried over Na2SO4, filtered and concentrated under reduced pressure to obtain the crude. The crude was purified (silica gel; 10% EtOAc/Hexanes) to afford compound 3 (50 mg, 9%) as an off-white solid. 1H NMR (500 MHz, DMSO-d6): δ 8.91 (s, 1H), 8.70 (d, J=5.0 Hz, 1H), 8.30 (s, 1H), 8.18-8.15 (m, 1H), 7.66-7.762 (m, 2H), 7.36-7.34 (m, 2H), 7.17-7.13 (m, 2H), 4.34 (q, J=7.5 Hz, 2H), 1.32 (t, J=7.5 Hz, 3H).

1. stirringAfter 24 h stirring at RT
2. extractionextracted with EtOAc (2×30 mL)
3. washThe combined organic extracts were washed with water (30 mL) and brine (30 mL)
4. dry with materialdried over Na2SO4
5. filtrationfiltered
6. concentrationconcentrated under reduced pressure
7. customto obtain the crude
8. customThe crude was purified (silica gel; 10% EtOAc/Hexanes)