The intramolecular Diels–Alder reaction of compounds (4) and (12) leads to (5) and (13), which, after appropriate modification, are converted into the ring-expanded products (9) and (15).
M. T. Cox, J. Chem. Soc., Chem. Commun., 1975, 903 DOI: 10.1039/C39750000903
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