Me. Lasterrasanchez et al., DEVELOPMENT OF THE JULIA ASYMMETRIC EPOXIDATION REACTION .1. APPLICATION OF THE OXIDATION TO ENONES OTHER THAN CHALCONES, Journal of the Chemical Society. Perkin transactions. I, (4), 1996, pp. 343-348
Asymmetric epoxidation of a variety of enones 3, 6, 8, 10, 12, 14, 16,
18, 21, 22, 26, 28-30 and 36 gives the corresponding oxiranes in good
to excellent yield and optical purity, The oxidation medium consists
of basic peroxide or sodium perborate or sodium percarbonate or tert-b
utylhydroperoxide and the preferred catalyst is polyleucine, convenien
tly prepared from the N-carboxyanhydride using 1,3-diaminopropane.