Enantioselective Synthesis and Stereoselective Rearrangements of Enol Ester Epoxides
Yuanming Zhu, Lianhe Shu, Yong Tu and Yian Shi*
*Department of Chemistry, Colorado State University, Fort Collins, Colorado 80523, USA, Email: yian.shicolostate.edu
Y. Zhu, L. Shu, Y. Tu, Y. Shi, J. Org. Chem., 2001, 66, 1818-1826.
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Enol esters can be epoxidized with high enantioselectivities using a fructose-derived chiral ketone as catalyst and Oxone as oxidant. A subsequent acid-catalyzed rearrangement can proceed through two distinct pathways, one with retention of configuration and the other with inversion. Whereas a strong acid favors retention of configuration, a weak acid favors inversion of configuration.
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cyclohexanones, α-hydroxy ketones