30-Norfriedelane triterpenes from the stem bark ofCaloncoba glauca

Rosa M. Giner-Pons, Alexander I. Gray, Catherine Lavaud, Georges Massiot, Simon Gibbons, Peter G. Waterman

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Abstract

The stem bark ofCaloncoba glauca has yielded three friedelane triterpenes of which two are characterized by the loss of C-30 and the presence of a C-27, C-15 lactone. They were identified, with considerable use of long-range CH coupling studies, as the known compound trichadonic acid (3-oxofriedelan-27-oic acid) and two new 30-norfriedelane derivatives, 3,27-dioxo-30-norfriedelan-20(29)-en-27,15α-lactone (caloncobalactone) and 3,27-dioxo-21β-hydroxy-30-norfriedelan-20(29)-en-17,15α-lactone (21β-hydroxycaloncoba lactone).
Original languageEnglish
Pages (from-to)223-225
Number of pages3
JournalPhytochemistry
Volume31
Issue number1
DOIs
Publication statusPublished - Jan 1992

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