Abstract
Cu(II) complexes of hydroxy oxazolines derived from (+)-(S)-ketopinic acid catalyze the asymmetric hetero-Diels-Alder cycloaddition of enol ethers and β,γ-unsaturated α-keto esters. The reaction takes place with unprecedented exo selectivity providing 2,4-trans-disubstituted chiral 2,3-dihydropyrans with up to 88% ee.
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