Intramolecular [2 + 2] photocycloaddition of 3-(1,5-dimethylhex-4-enyl)cyclohex-2-enone leads to a major intermediate which can be converted into the noracorenone system (5), via a Norrish type II fission; Lewis acid (Ag+) treatment of the isopropenyl group transformed (5) into the isomeric spiro[4.5]decane system (7)
D. D. K. Manh, J. Ecoto, M. Fetizon, H. Colin and J. Diez-Masa, J. Chem. Soc., Chem. Commun., 1981, 953 DOI: 10.1039/C39810000953
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