Heterogeneous asymmetric catalysts using amino acid as chiral promoter were synthesized by attachment of amino acids such as L-glutamic acid and L-phenylalanine onto the hydrophilic part of hydrolyzed octadecyltrichlorosilane (OTS). The catalysts exhibit 12-18% enantiomeric excess (ee) for the asymmetric hydration of epoxycyclohexene to yield (1R,2R)-trans-1,2-cyclohexanediol and (1S,2S)-trans-1,2-cyclohexanediol.
- heterogeneous asymmetric catalysts,
- amino acid as chiral promoter,
- asymmetric hydration of epoxycyclohexene
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