反应详情

温度

0 °C

A suspension consisting of CrCl2 (12.93 g, 105.38 mmol) and 700 mL anhydrous THF is cooled to 0° C. 2,4-dideoxy-5-O-[(1,1-dimethylethyl)dimethylsilyl]-3-O-[(4-methoxyphenyl)methyl]-2,4-dimethyl-L-lyxose (8.9 g, 23.42 mmol) in 40 mL THF is added dropwise. (1-Bromoallyl) trimethylsilane (22.61, 117.1 mmol) is added neat. After 3 h at room temperature, the reaction mixture is cooled to 10° C. Methanol (270 mL) and 6 N aqueous KOH (550 mL) are added in sequence, keeping the reaction temperature less than 20° C. during the addition. The mixture is stirred overnight at room temperature. The organic layer is separated. The aqueous layer is extracted with ether (3×400 mL). The combined organic phase is washed with brine, dried over NaSO4, and concentrated. Flash chromatography gives the desired compound (6.74 g, 71.2%) as a clear oil.

1. temperaturethe reaction mixture is cooled to 10° C
2. customthe reaction temperature less than 20° C.
3. additionduring the addition
4. customThe organic layer is separated
5. extractionThe aqueous layer is extracted with ether (3×400 mL)
6. washThe combined organic phase is washed with brine
7. dry with materialdried over NaSO4
8. concentrationconcentrated