反应详情

温度

0 °C

A mixture of 2-methyl-4-(trifluoromethyl)-1H-indole (Example 114D) (0.48 g, 2.41 mmol) was dissolved in HOAC (3.0 mL), cooled to 0° C. and NaBH3CN (0.454 g, 7.23 mmol) was added in one portion. After 5 min the mixture was removed from the cooling bath and stirred at rt for 14 h. The mixture cooled to 0° C. and the pH was adjusted to ca. 13 by addition of 1 N NaOH (20 mL) and further addition of solid NaOH pellets. The mixture was extracted with Et2O (×3), combined organics were washed (H2O, brine), dried over Na2SO4, filtered and concentrated in vacuo. The residue was dissolved in dry CH2Cl2 (10 mL) and treated with DMAP (0.884 g, 7.23 mmol). The mixture was cooled to 0° C. and Ac2O (0.455 mL, 4.81 mmol) was added dropwise via syringe. The mixture was stirred overnight, slowly warming to rt, diluted with CH2Cl2, washed (10% HCl, H2O, brine), dried over Na2SO4, filtered, and concentrated in vacuo. The residue was purified by flash chromatography (EtOAc/hexanes), affording 0.25 g of the title compound as a pale yellow oil: MS (ES) m/z 244 (M+1).

1. dissolutionwas dissolved in HOAC (3.0 mL)
2. customAfter 5 min the mixture was removed from the cooling bath
3. temperatureThe mixture cooled to 0° C.
4. additionthe pH was adjusted to ca. 13 by addition of 1 N NaOH (20 mL) and further addition of solid NaOH pellets
5. extractionThe mixture was extracted with Et2O (×3)
6. washcombined organics were washed (H2O, brine)
7. dry with materialdried over Na2SO4
8. filtrationfiltered
9. concentrationconcentrated in vacuo
10. dissolutionThe residue was dissolved in dry CH2Cl2 (10 mL)
11. temperatureThe mixture was cooled to 0° C.
12. stirringThe mixture was stirred overnight
13. temperatureslowly warming to rt
14. washwashed (10% HCl, H2O, brine)
15. dry with materialdried over Na2SO4
16. filtrationfiltered
17. concentrationconcentrated in vacuo
18. customThe residue was purified by flash chromatography (EtOAc/hexanes)