反应详情

Compound 46 (0.254 g, 0.91 mmol) was diluted with anhydrous DMF (10 mL), and NaCN (0.230 g, 4.55 mmol) was added. The orange mixture was stirred at room temperature for 17 h. The mixture was concentrated and partitioned between EtOAc and H2O (50 mL each) and the layers were separated. The aqueous phase was extracted with EtOAc (2×50 mL) and the combined organic layers were washed with H2O (2×80 mL) and sat aq. NaCl (50 mL), and dried over anhydrous sodium sulfate and concentrated. The residue was purified by flash column chromatography (SiO2), eluting with a gradient of 15% EtOAc in CH2Cl2 to 25% EtOAc in CH2Cl2 to yield the title compound as a white solid (0.170 g, 83%): mp 154-155° C.; 1H-NMR (500 MHz; CDCl3): δ 8.48 (d, J=8.6 Hz, 1 H), 8.22 (br s, 1 H), 8.20 (d, J=9.0 Hz, 1 H), 7.85 (d, J=8.7 Hz, 1 H), 7.81 (d, J=1.0 Hz, 1 H), 7.61 (dd, J=8.7, 2.1 Hz, 1 H), 3.96 (s, 2 H), 2.30 (s, 3 H); 13C-NMR (126 MHz; CDCl3): δ 169.1 (1 C), 151.3 (1 C), 145.8 (1 C), 138.6 (1 C), 129.8 (1 C), 128.3 (1 C), 126.74 (1 C), 126.64 (1 C), 126.2 (1 C), 117.6 (1 C), 114.9 (1 C), 25.0 (1 C), 23.7 (1 C); ESIMS m/z (rel. intensity) 472 (2M+Na+, 100).

1. additionwas added
2. concentrationThe mixture was concentrated
3. custompartitioned between EtOAc and H2O (50 mL each)
4. customthe layers were separated
5. extractionThe aqueous phase was extracted with EtOAc (2×50 mL)
6. washthe combined organic layers were washed with H2O (2×80 mL)
7. dry with materialdried over anhydrous sodium sulfate
8. concentrationconcentrated
9. customThe residue was purified by flash column chromatography (SiO2)
10. washeluting with a gradient of 15% EtOAc in CH2Cl2 to 25% EtOAc in CH2Cl2