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Communication | Special issue | Vol 7, No. 1, 1977, pp.161-164
Published online, 1st January, 1970
DOI: 10.3987/S-1977-01-0161
Rupestralic Acid, a New Diterpene Lactone

Giuseppe Savona, Franco Piozzi,* and Marialuisa Marino

*Dipartimento di Chimica Organica, Università digli Studi di Palermo, Via Archirafi 20 90123 Palermo, Italy


Rupestralic acid, extracted from Ballota rupestris (Labiatae) is assigned structure [III]-[IV]. The reaction with diazomethane yields an unstable epoxy ester [V] which changes either into the methyl ketone [VI] or into the lactone [VII]. An interesting fragmentation is evidenced in the mass spectra of such compounds.