反应详情

温度

-20 °C

A solution of 4-[2-cyano-2-(4-trifluoromethoxyphenyl)vinyl]benzoic acid methyl ester (9.0 g, 25.92 mmol) in THF (50 mL) was stirred and cooled to −20° C. A solution of sodium borohydride in THF (100 mL) was added during 20 minutes. The cooling bath was removed and the mixture was stirred for two hours at room temperature and then kept at 5° C. for 16 hours. Ice (100 g) was added and the mixture was neutralised (pH 4-5) with 1 M hydrochloric acid (50 mL). The resulting mixture was extracted with DCM and washed with brine. The organic phase was dried (MgSO4), purified (Norite A), filtered and evaporated. The residue was dried at 40° C. in vacuo to afford 8.8 g (97%) of 4-[2-cyano-2-(4-trifluoromethoxyphenyl)ethyl]benzoic acid methyl ester.

1. customThe cooling bath was removed
2. waitkept at 5° C. for 16 hours
3. additionIce (100 g) was added
4. extractionThe resulting mixture was extracted with DCM
5. washwashed with brine
6. dry with materialThe organic phase was dried (MgSO4)
7. custompurified (Norite A),
8. filtrationfiltered
9. customevaporated
10. customThe residue was dried at 40° C. in vacuo