SCHEDULED MAINTENANCE
A key intermediate, 10-ethoxy-3-methoxy-6bβ, 12bα, 14aβ-trimethyl-5,6,6aα, 6b,7,8,12b,13,14,14a-decahydropicene (1), for synthesis of pentacyclic triterpenoids has been stereoselectively synthesised; the key stage is an intramolecular cycloaddition of the o-quinodimethane (19) to give the corresponding cyclised compound (4).
T. Kametani, Y. Hirai, F. Satoh and K. Fukumoto, J. Chem. Soc., Chem. Commun., 1977, 16 DOI: 10.1039/C39770000016
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