Tetranortriterpenoids and related substances. Part XVII. A new skeletal class of triterpenoids from Guarea glabra(Meliaceae)

Authors:
  • GFGeorge Ferguson
    George Ferguson
  • PGP. Alastair Gunn
    P. Alastair Gunn
  • WMWayne C. Marsh
    Wayne C. Marsh
  • RMRobert McCrindle
    Robert McCrindle
  • RRRoderic Restivo
    Roderic Restivo
  • JCJoseph D. Connolly
    Joseph D. Connolly
  • JFJohn W. B. Fulke
    John W. B. Fulke
  • MHMargaret S. Henderson
    Margaret S. Henderson
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Abstract
Seven new triterpenoids from the heartwood of Guarea glabra are formulated as (1)–(5), (14), and (26) on the basis of chemical, spectroscopic, and X-ray evidence. All are based on the novel pentacyclic triterpane skeleton, (20S)-4,4,8β-trimethyl-14,18-cyclo-5α,13α,14α,17α-cholestane (16).