A short enantioselective synthesis of (+)-sterpurene: complete intramolecular transfer of central to axial to central chiral elements

L'etape cle de la synthese est une addition de Diels Alder intramoleculaire et stereoselective du (dimethyl-4,4 methyl-2' cyclobutene-1'yl-1) heptene-6yne-1ol-3, obtenu a partir du dimethyl-4,4 heptene-6yne-1ol-3