- XANTHONES AND TRITERPENES OF CALOPHYLLUM TOMENTOSUM
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Key Word Index-Calophyllum tomentosum; Guttiferae; xanthones; triterpenes; branch timber; sapwood; heartwood.Abstract-The bark, branch timber, sapwood and heartwood extractives of Calophyllum tomentosum contain friedelin, friedelan-3-β-ol, betulinic acid, taraxerol, taraxerone, calabaxanthone, 6-deoxyjacareubin, 1,5-dihydroxyxanthone, 1,6-dihydroxy-5-methoxyxanthone, 1,7-dihydroxyxanthone, jacareubin and 1,3,5-trihydroxy-2(3-methylbut-2-enyl)xanthone.The heartwood contains only xanthones.Sapwood and branch timber are chemically similar.Calabaxanthone is present in the bark but not in the branch timber which has only triterpenes and sitosterol.
- Karunanayake, Subadra,Sotheeswaran, Subramanian,Sultanbawa, M. Uvais S.,Balasubramaniam, Sinnathamby
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- Intramolecular Anionic Friedel-Crafts Equivalents. A General Regiospecific Route to Substituted and Naturally Occurring Xanthen-9-ones
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An LDA-induced regiospecific and general conversion of diaryl ether 2-carboxamides 4 into substituted xanthones 5, including natural products, 2-hydroxy-1-methoxyxanthone (8) and 6-deoxyjacareubin (14), is described.
- Familoni,Ionica, Ileana,Bower, Justin F.,Snieckus, Victor
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p. 1081 - 1083
(2007/10/03)
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