The syntheses of (±)-18,19-dinor -13βH,14αH-cheilantane (1) and its C-13 epimer (6), from (±)-methyl isocopalate (3)via the key intermediate (5) are described.
M. G. Sierra, R. M. Cravero, M. de Ios Angeles Laborde and E. A. Rúveda, J. Chem. Soc., Chem. Commun., 1984, 417 DOI: 10.1039/C39840000417
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