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A new, highly efficient procedure for the Julia-Colonna epoxidation is reported. Based on the original triphasic protocol it is shown that the co-catalysis of the reaction with phase transfer catalysts results in a dramatic increase of reactivity and sometimes also in a higher enantiomeric excess of product. The required amount of polyamino acid can be significantly reduced under the new conditions,...
The addition of a phase-transfer catalyst significantly accelerates the Julia-Colonna epoxidation reaction yielding chiral, nonracemic epoxy ketones. Furthermore, a reliable procedure for the preparation of highly active poly-l-leucine catalyst is reported.
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