The chemistry of the Euphorbiaceae. VII. The diterpenes of Ricinocarpus stylosus Diels

Authors:
  • CHCa Henrick
    Ca Henrick
  • PJPr Jefferies
    Pr Jefferies
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Abstract
The ether extract of Ricinocarpus stylosus has yielded polyalthic acid, three new naturally occurring flavonoid pigments and four new kauranoid diterpenes. The latter have been shown to be 16a-(-)-kauran-l7,19-dioic acid (I; R,R' = CO2H), 19-hydroxy-16a-(-)-kauran-17-oic acid (I; R = CH2OH, R' = CO2H), kauran-16a,-17,19-triol (III; R,R' = CH2OH) and (-)-kaur-16-en-19-oic acid (IV; R = CO2H). The N.M.R. correlations of these diterpenoids are discussed.