Three new (5–7) and two known (4 and 8) polyketide derivatives have been isolated from the Caribbean sponge Plakortis simplex. Their stereostructures have been determined by spectroscopic methods and chemical transformations that include Zn-mediated reduction and Dess–Martin oxidation, and by application of Mosher’s method. The cycloperoxide derivatives plakortide Q (7) and compound 8 were evaluated
从加勒比海绵 Plakortis simplex 中分离出三种新的 (5-7) 和两种已知的 (4 和 8) 聚酮衍
生物。它们的立体结构已通过光谱方法和
化学转化(包括 Zn 介导的还原和 Dess-Martin 氧化)以及 Mosher 方法的应用确定。评估了环过氧化物衍
生物 plakortide Q (7) 和化合物 8 对恶性疟原虫的
氯喹敏感和
氯喹抗性菌株的体外抗疟活性。这些分子相对于 plakortin 的效力较低表明 C-3 的构型变化对抗疟活性产生负面影响。(© Wiley-
VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2005)