反应详情

A solution of compound 81 (0.5 g, 1.346 mmol) in dry methanol (20 mL) was treated with hydrazine hydrate (0.41 mL, 13.461 mmol) followed by Raney-Ni (0.1 g) and the resulting mixture was refluxed for 30 min. The reaction was brought to room temperature, filtered through celite bed, washed with CH2Cl2:methanol (1:1, 3 20 mL). The combined organic layer was evaporated and crude was purified by column chromatography (EtOAC: Hexanes, 1:1) to obtain compound 98 (0.43 g, 94%) as a foam. 1H NMR (DMSO-d6) δ: 1.38-1.41 (m, 11H), 1.76-1.86 (m, 2H), 2.14-2.42 (m, 2H), 2.73 (s, 3H), 4.05-4.15 (m, 1H), 4.49 (s, 2H), 6.00 (brs, 1H), 6.48 (dd, 1H, J=1.8, 8.2 Hz), 6.99 (d, 1H, J=1.5 Hz), 7.05 (d, 1H, J=8.4 Hz), 7.16 (d, 1H, J=2.7 Hz), 10.60 (s, 1H); ESI-MS m/z (%): 364 (M+Na+, 7), 342 (MH+, 11), 286 (100).

1. temperaturethe resulting mixture was refluxed for 30 min
2. customwas brought to room temperature
3. filtrationfiltered through celite bed
4. washwashed with CH2Cl2:methanol (1:1, 3 20 mL)
5. customThe combined organic layer was evaporated
6. customcrude was purified by column chromatography (EtOAC: Hexanes, 1:1)