Exo-Selective Asymmetric Inverse-Electron Demand Hetero-Diels-Alder Reaction Catalyzed by Cu(II)-Hydroxy Oxazoline Ligands
作者:Gonzalo Blay、José Pedro、Andrea Barba、Santiago Barroso、Luz Cardona、Martina Melegari
DOI:10.1055/s-0030-1260780
日期:2011.7
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.
衍生自 (+)-(S)-酮品酸的羟基恶唑啉的 Cu(II) 络合物催化烯醇醚和 β,γ-不饱和 α-酮酯的不对称杂狄尔斯-阿尔德环加成反应。该反应以前所未有的外选择性发生,提供 2,4-反式-二取代的手性 2,3-二氢吡喃,ee 高达 88%。