反应详情

温度

-70 °C

A solution of (S)-(−)-2-Butyl-CBS-oxazaborolidine solution (3.0 ml 1.0 M in toluene) and catecholborane (30 ml 1.0 M in THF) was stirred at RT for 30 min. The mixture was then cooled to −70° C. and 2,2,2-trifluoro-1-(6-methyl-2-(3-methyl-1H-pyrazol-1-yl)pyridin-3-yl)ethanone (1 g, 2.9 mmol) in THF (16 mL) was added dropwise. After addition, the reaction mixture was warmed up to −32° C. and stirred for 12 h. After this time, 3N NaOH (18 mL) was added followed by H2O2 (18 mL) and the temperature of the reaction mixture was increased to RT for 30 min and then extracted with ethyl. The combined organic layers were washed with brine, dried over Na2SO4, filtered, and concentrated in vacuo and purified by normal phase silica gel column (EtOAc/hepate) to provide the title compound as a yellow solid.

1. additionAfter addition
2. temperaturethe reaction mixture was warmed up to −32° C.
3. temperaturethe temperature of the reaction mixture was increased to RT for 30 min
4. extractionextracted with ethyl
5. washThe combined organic layers were washed with brine
6. dry with materialdried over Na2SO4
7. filtrationfiltered
8. concentrationconcentrated in vacuo
9. custompurified by normal phase silica gel column (EtOAc/hepate)