Phainanoids A–F, A New Class of Potent Immunosuppressive Triterpenoids with an Unprecedented Carbon Skeleton from <i>Phyllanthus hainanensis</i>
作者:Yao-Yue Fan、Hua Zhang、Yu Zhou、Hong-Bing Liu、Wei Tang、Bin Zhou、Jian-Ping Zuo、Jian-Min Yue
DOI:10.1021/ja511813g
日期:2015.1.14
highly modified triterpenoids with a new carbon skeleton by incorporating two unique motifs of a 4,5- and a 5,5-spirocyclic systems, were isolated from Phyllanthus hainanensis. Their structures with absolute configurations were determined by spectroscopic data, chemical methods, and X-ray crystallography. Compounds 1-6 exhibited exceptionally potent immunosuppressive activities in vitro against the proliferation
Phainanoids AF (1-6) 是六种高度修饰的三萜类化合物,通过结合 4,5- 和 5,5-螺环系统的两个独特基序而具有新的碳骨架,是从 Phyllanthus hainanensis 中分离出来的。它们的绝对构型结构是通过光谱数据、化学方法和 X 射线晶体学确定的。化合物 1-6 在体外对 T 和 B 淋巴细胞的增殖表现出异常有效的免疫抑制活性。最有效的一种,phainanoid F (6),显示出抑制 T 细胞增殖的活性,IC50 值为 2.04 ± 0.01 nM(阳性对照 CsA = 14.21 ± 0.01 nM)和 B 细胞,IC50 值为 <1.60 ± 0.01 nM( CsA = 352.87 ± 0.01 nM),分别是 CsA 的 7 倍和 221 倍。讨论了1-6的构效关系。