We have found the first successful example of reverse-electron-demand dipole-LUMO/dipolarophile-HOMO controlled cycloaddition reactions between carbonyl ylides, which were generated from o-methoxycarbonyl-alpha-diazoacetophenone and their acyl derivatives as precursors, and vinyl ether derivatives with high levels of asymmetric induction (97-77% ee) using chiral 2,6-(oxazolinyl)pyridine-Eu(III) or binaphthyldiimine-Ni(II) complexes as chiral Lewis acid catalysts.
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| http://dx.doi.org/10.1021/ol701936b | DOI Listing |
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