Ie. Marko et Gr. Evans, CATALYTIC, ENANTIOSELECTIVE, INVERSE ELECTRON-DEMAND DIELS-ALDER (IEDDA) REACTIONS OF 3-CARBOMETHOXY-2-PYRONE (3-CMP), Tetrahedron letters, 35(17), 1994, pp. 2771-2774
Cycloaddition reactions between 5-CMP 1 and various vinyl ethers and v
inyl sulphides, catalysed by the Yb(OTf)(3)-Binol complex, afford bicy
clic lactones 3 in moderate to excellent enantiomeric excesses.