Cycloaddition reactions between the chiral 2-pyrone derivatives 3 and various dienophiles, catalysed by lanthanide shift reagents, afford bicyclic lactones 8 in high diastereomeric excesses.
Marko Istvan E., Evans Graham R., Declercq Jean-Paul, Tetrahedron, 50 (1994) N 15, S 4557-4574
作者:Marko Istvan E., Evans Graham R., Declercq Jean-Paul