反应详情

To 2C (5.00 g, 20.9 mmol) in THF (80 mL) at reflux was added a 1M THF solution of BH3.THF (63 mL, 62.7 mmol) via an addition funnel, dropwise over 20 min. After refluxing for 6 h, additional BH3.THF solution was added (20 mL) and refluxing continued overnight. After cooling to rt, 6N HCl (12.5 mL) was added and the reaction was heated again to reflux for 1 h. The reaction was cooled to rt, concentrated then azeotroped (3×) with MeOH/THF. After drying under vacuum for 1 h, the resulting residue was taken up in THF and filtered to provide 2D as a white solid. 1H NMR (400 MHz, CD3OD) δ ppm 1.94-2.11 (m, 2H), 2.13-2.26 (m, 2H), 2.43-2.61 (m, 2H), 4.11-4.23 (m, 1H), 4.43 (s, 2H), 7.66-7.76 (m, 2H), 7.81 (t, J=6.81 Hz, 1H), 8.03 (d, J=6.15 Hz, 1H). LC-MS: 226.11 (M+H)+.

1. temperatureAfter refluxing for 6 h
2. temperaturerefluxing continued overnight
3. temperaturethe reaction was heated again
4. temperatureto reflux for 1 h
5. temperatureThe reaction was cooled to rt
6. concentrationconcentrated
7. customthen azeotroped (3×) with MeOH/THF
8. customAfter drying under vacuum for 1 h
9. filtrationfiltered