4-Substituted pentacyclo [5.3.0.02,5.03,9.04,8]decan-6-one derivatives 2a and b undergo a novel acid-or Ag+-catalysed rearrangement to the hitherto unknown pentacyclo[4.4.0.02,10.03,8.05,7]decane ring system 3a and b. The structure of compound 3a was established by X-ray crystallographic analysis.
T. Ogino, K. Awano and Y. Fukazawa, J. Chem. Soc., Perkin Trans. 2, 1990, 1735 DOI: 10.1039/P29900001735
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