【摘要】 从楝科植物香港坚木（Ｄｙｓｏｘｙｌｕｍｈｏｎｇｋｏｎｇｅｎｓｅ（Ｔｕｆｃｈ．）Ｍｅｒ）的树叶中分得了４个新的达玛烷型三萜，基于详细的光谱分析及与同类化合物的光谱数据比较鉴定了其结构，分别命名为：２０Ｒ，２４Ｒ－表－２５－达玛烷烯－３－酮（３），１６β－羟基达玛烷－２０（２２），２５－二烯－３－酮（４），２６－羟基达玛烷－２０，２４－二烯－３－酮（５）和３β－乙酰基－７α，２１Ｓ，２５－三羟基－２１Ｓ，２３Ｒ－表－９（１１）－达玛烷烯（８）。更多还原

【Abstract】 Four new dammarane type triterpenoids, named (20R, 24R)-epoxy-25-dammaren-3-one; 16 β-hydroxy-dammara-20(22), 25-dien-3-one(4); 26-hydroxy-dammara-20, 24-dien-3-one(5); 7α,21S, 25-trihydroxy-3β-acetoxy-21S, 23R-epoxy-9(11)-en-dammarane(8) together with four known compounds, ergosterol peroxide, dammara-20, 24-dien-3 β-ol, 20-R-form hydroxydammaranone and cycloart-23-ene-3 β, 25-diol were isolated from the leaves of Dysoxylum hongkongense. The proposed structures were established by spectral analysis and comparisons with closely related compounds.更多还原