作者:Toshihiro Murata、Toshio Miyase、Francis Wamakima Muregi、Yasuko Naoshima-Ishibashi、Kaoru Umehara、Tsutomu Warashina、Shigeyuki Kanou、Gerald M. Mkoji、Mamoru Terada、Akira Ishih
DOI:10.1021/np0780093
日期:2008.2.1
From the stem bark of Ekebergia capensis, 10 new triterpenoid compounds, ekeberins A (1), B (2), C1 (3), C2 (4), C3 (5), D1 (6), D2 (7), D3 (8), D4 (9), and D5 (10), were isolated together with 17 known compounds. The structures of these new compounds were elucidated on the basis of the results of spectroscopic analysis, and the absolute configuration of compounds 6-10 were determined by partial synthesis
从海蓝藻(Ekebergia capensis)的茎皮中,发现10种新的三萜类化合物,即海藻素A(1),B(2),C1(3),C2(4),C3(5),D1(6),D2(7),D3 (8),D4(9)和D5(10)与17种已知化合物一起分离出来。根据光谱分析结果阐明了这些新化合物的结构,并通过从已知化合物进行部分合成并使用Mosher酯法确定了化合物6-10的绝对构型。在体外针对氯喹(CQ)敏感和耐药的恶性疟原虫分离株筛选了其中的几种化合物,发现它们具有中等的抗疟原虫活性,其中化合物20(7-脱乙酰氧基-7-氧杂草宁)和27(2-羟甲基- 2,3,22,23-四羟基-2,6,10,15,19,23-六甲基-6,10,14,18-tet racosatetraene)的IC50值显示为6和7 microM,分别。在小鼠模型中,剂量为500 mg / kg的化合物27对伯氏疟原虫NK 65的中度寄生虫病抑制率为52