Intramolecular Diels–Alder reaction in 1-oxaspiro[2.5]octa-5,7-dien-4-one and sigmatropic shifts in excited states: novel route to sterpuranes and linear triquinanes: formal total synthesis of (±)-coriolin
Intramolecular Diels–Alder reaction in 1-oxaspiro[2.5]octa-5,7-dien-4-one and sigmatropic shifts in excited states: novel route to sterpuranes and linear triquinanes: formal total synthesis of (±)-coriolin