反应详情

The product of Example 304C (3.85 g, 0.0125 mol) was treated with iron powder (4.3 g, 0.077 mol, 6.15 equivalent) and ammonium chloride (4.4 g, 0.082 mol) in methanol (100 mL) and water (50 mL), and stirred at reflux for 1 hour. The hot reaction mixture was filtered through fluted filter paper and washed with hot methanol. The filtrate was concentrated under reduced pressure to a white semi-solid that was partitioned between ethyl acetate and water. The organic layer was washed with brine, dried over anhydrous sodium sulfate, filtered and the solvent removed under reduced pressure to give the title compound as a off white solid (2.5 g). 1H NMR (300 MHz, DMSO-d6) δ ppm 4.98 (s, 2 H) 5.46 (s, 2 H) 6.76 (d, J=8.82 Hz, 1 H) 7.01 (dd, J=8.82, 2.94 Hz, 1 H) 7.21 (d, J=2.94 Hz, 1 H) 7.23 (s, 2 H) 7.37 (m, 5 H). ESI m/z (M+H)+279. ESI m/z (M−H)−277.

1. temperatureat reflux for 1 hour
2. filtrationThe hot reaction mixture was filtered
3. filtrationthrough fluted filter paper
4. washwashed with hot methanol
5. concentrationThe filtrate was concentrated under reduced pressure to a white semi-solid
6. customthat was partitioned between ethyl acetate and water
7. washThe organic layer was washed with brine
8. dry with materialdried over anhydrous sodium sulfate
9. filtrationfiltered
10. customthe solvent removed under reduced pressure