DITERPENOIDS FROM GRINDELIA-TARAPACANA
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1995
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Abstract
Seven new and two known diterpenoids, as well as alpha-spinasterol, were isolated from Grindelia tarapacana. The new diterpenoids were fully characterized, on the basis of spectroscopic analysis and chemical evidence, as 14,15-dihydroxy-13-epi-manoyloxide (tarapacol), 15-acetoxy-14-hydroxy-13-epi-manoyloxide (tarapacol 15-acetate), 14,15-diacetoxy-13-epi-manoyloxide (tarapacol diacetate), 11 alpha,14,15-trihydroxy-13-epi-manoyloxide (tarapacanol A), 14,15-diacetoxy-11 alpha-hydroxy-13-epi-manoyloxide (tarapacanol A 14,15-diacetate), 14,15-dihydroxy-11-keto-13-epi-manoyloxide (tarapacanone) and 12 alpha,14,15-trihydroxy-13-epi-manoyloxide (tarapacanol B). The known diterpenoids were identified as 13-epi-manoyloxide and 12 alpha-hydroxy-13-epi-manoyloxide.
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GRINDELIA TARAPACANA, ASTERACEAE, ASTEREAE, SOLIDAGININAE, ISOLATION, CHARACTERIZATION, DITERPENOIDS, 13-EPI-MANOYLOXIDE DERIVATIVES