Tandem pericyclic reactions. The first X-Ray structure of an initial pyrone-olefin adduct and an easy, stereocontrolled, entry into polyoxygenated cyclohexanes

Abstract Under high-pressure conditions, 2-pyrone undergoes Diels-Alder reaction with a variety of dienophiles, leading to isolable, bridged, bicyclic lactones. The first X-Ray structure of one of these lactones and its conversion into polyoxygenated cyclohexane derivatives is reported.