| Autor: |
Arai, Shigeru, Tsuge, Hiroki, Shioiri, Takayuki |
| Zdroj: |
Tetrahedron Letters; January 1998, Vol. 39 Issue: 41 p7563-7566, 4p |
| Abstrakt: |
Asymmetric epoxidation of a,b-unsaturated ketones with H 2O 2was developed using a chiral quaternary ammonium salt as the phase-transfer catalyst. A catalytic amount of N-[4-(iodo)benzyl]cinchoninium bromide, easily prepared from cinchonine, was effective in the asymmetric epoxidation for producing the corresponding desired products with up to 92% ee under mild reaction conditions. |
| Databáze: |
Supplemental Index |
| Externí odkaz: |
|
Full Text from ScienceDirect