反应详情

温度

0 °C

The product of the Example 25b (140 mg, 0.393 mmol) was dissolved in anhydrous dichloromethane (10 mL) and under nitrogen atmosphere was added trifluoroacetic acid (5 mL) at 0° C. The reaction mixture was stirred at 0° C. for 10 minutes and to the resulting dark orange solution was then added, in small portions sodium borohydride (290 mg, 7.86 mmol). The reaction mixture was stirred at 0° C. for 15 minutes and then at room temperature for 5 minutes. The solvent and trifluoroacetic acid were evaporated under reduced pressure and the residue was extracted with dichloromethane. The combined organic extracts were washed with water, brine, dried over sodium sulfate and filtered. The filtrate was evaporated under reduced pressure to give the crude which upon trituration with hexane yielded the title compound as a white solid, (110 mg, 83%), mp 97-98° C. 1H NMR (CDCl3) δ7.97 (d, J=8.3 Hz, 2H), 7.45 (d, J=8.3 Hz, 2H), 7.45-7.15 (m, 5H), 6.98 (dt, J=8.4 and 2.2 Hz, 1H), 6.75 (d, J=7.6 Hz, 1 H), 6.63 (d, J=10 Hz, 1H); 13C NMR (CDCl3) δ164.4, 161.2, 147.2, 143.3 (d, J=7 Hz), 140.3, 139.2, 137.2, 130.7, 130.1 (2×C), 129.9, 129.7 (d, J=2.5 Hz), 128.6, 127.1 (2×C), 126.9, 124.3 (d, J=2.5 Hz), 115.4 (d, J=21 Hz), 112.9 (d, J=21 Hz), 44.5, 38.9; LRMS (APIMS) m/z 358 (M+NH4)+.

1. stirringThe reaction mixture was stirred at 0° C. for 15 minutes
2. waitat room temperature for 5 minutes
3. customThe solvent and trifluoroacetic acid were evaporated under reduced pressure
4. extractionthe residue was extracted with dichloromethane
5. washThe combined organic extracts were washed with water, brine
6. dry with materialdried over sodium sulfate
7. filtrationfiltered
8. customThe filtrate was evaporated under reduced pressure
9. customto give the crude which upon trituration with hexane