The asymmetric epoxidation of several chalcones and other electron-poor olefins, in the presence of catalytic amounts of poly-(S)-amino-acids in a triphase system with optical yields of up to 96% is described. The influence of the molecular structure of the catalysts and substrates, the solvent, and the temperature on the stereochemistry is discussed.
S. Juliá, J. Guixer, J. Masana, J. Rocas, S. Colonna, R. Annuziata and H. Molinari, J. Chem. Soc., Perkin Trans. 1, 1982, 1317 DOI: 10.1039/P19820001317
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