反应详情

To the solution of the product from Example 280A (360 mg, 0.91 mmol) in tetrahydrofuran (4 mL) was added 2,2,2-trifluoroethanol (227 mg, 2.27 mmol) and a 1.0 M solution of potassium tert-butoxide in tetrahydrofuran (2.27 mL, 2.27 mmol). The reaction mixture was stirred at room temperature for 24 hours. The mixture was diluted with water, and extracted with ethyl acetate. The organic extract was dried (Na2SO4), filtered and concentrated. Purification by reverse phase HPLC afforded the title compound. 1H NMR (500 MHz, CDCl3) δ ppm 1.64-1.75 (m, 1H) 1.90-2.00 (m, 2H) 2.10-2.20 (m, 1H) 2.51 (s, 3H) 2.80 (s, 3H) 3.73 (dd, J=1.59, 7.3 Hz, 1H) 3.88 (dd, J=15.3, 6.7 Hz, 1H) 4.07 (dd, J=13.7, 8.2 Hz, 1H) 4.33-4.41 (m, 1H) 4.47 (dd, J=16.8, 8.2 Hz, 2H) 4.62 (dd, J=13.7, 2.8 Hz, 1H) 7.03 (d, J=8.5 Hz, 1H) 7.39 (dd, J=8.5, 2.8 Hz, 1H) 8.02 (d, J=2.8 Hz, 1H); MS (ESI) m/z 477 (M+H)+.

1. extractionextracted with ethyl acetate
2. extractionThe organic extract
3. dry with materialwas dried (Na2SO4)
4. filtrationfiltered
5. concentrationconcentrated
6. customPurification by reverse phase HPLC