期刊
TETRAHEDRON
卷 58, 期 8, 页码 1623-1630出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/S0040-4020(02)00028-5
关键词
asymmetric epoxidation; diastereoselection; epoxides; phase transfer
The development of the catalytic asymmetric epoxidation of enones promoted by aqueous H2O2 with chiral quaternary ammonium salts is described. The reaction smoothly proceeded to give alpha,beta-epoxyketones with satisfactory enantioselectivities in both the trans and cis enone systems (up to 92% ee) by use of cinchonine or quinidine derivatives (5 mol%) as phase transfer catalysts. (C) 2002 Elsevier Science Ltd. All tights reserved.
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