Abstract
The synthesis of epoxides 3a-r is achieved in excellent yields by reaction of the α,β-unsaturated ketones 1a-c, 4,4'-disubstituted (E)-chalcones 1d-o, and 2'-hydroxy-4-substituted (E)-chalcones 1p-r with isolated dimethyldioxirane (2a) (as acetone solution) and/or in situ generated ethyl(methyl) dioxirane (2b). This method constitutes a useful alternative to the Weitz-Scheffer epoxidation (alkaline H 2 O 2 ) of such electron-poor substrates
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