反应详情

温度

-25 °C

A 4-cyano-5-methyl-4-phenylhexanoic acid (500 mg, 2.16 mmol)/tetrahydrofuran (3.84 ml) solution was slowly added dropwise into a 1M-borane tetrahydrofuran complex/tetrahydrofuran solution (2.70 ml, 2.70 mmol) cooled to −25° C., while keeping the bulk temperature at −15° C. or less. After the completion of the dropwise addition, the bulk temperature was elevated to room temperature. After the completion of the reaction, it was cooled again and methanol (0.33 ml) was added dropwise thereinto. Further, a saturated aqueous sodium hydrogen carbonate solution (200 ml) was added thereinto, followed by extracting with ethyl acetate. The organic layer was successively washed with water, brine and saturated aqueous sodium hydrogen carbonate, followed by drying over magnesium sulfate and evaporating the solvent. The residue was purified by 20 g of Cromatorex NH silica gel (ethyl acetate/hexane system), to give the title compound as a colorless highly viscous oil (426 mg, 1.96 mmol, yield: 90.8%).

1. customat −15° C. or less
2. additionAfter the completion of the dropwise addition
3. customwas elevated to room temperature
4. customAfter the completion of the reaction, it
5. temperaturewas cooled again
6. extractionby extracting with ethyl acetate
7. washThe organic layer was successively washed with water, brine and saturated aqueous sodium hydrogen carbonate
8. dry with materialby drying over magnesium sulfate
9. customevaporating the solvent
10. customThe residue was purified by 20 g of Cromatorex NH silica gel (ethyl acetate/hexane system)