Metabolites from the sponge Plakortis simplex. Determination of absolute stereochemistry of plakortin. Isolation and stereostructure of three plakortin related compounds
the dodecanoic acid derivatives 4 and 5, were isolated from the Caribbean marine sponge Plakortis simplex, and their structures fully characterized by spectroscopic and chemical means. The absolutestereochemistries of the known plakortin (1) and of compounds 3–5 were determined by applying Mosher's and Kusumi's methods on opportune degradation products. The isolated compounds exhibited cytotoxic activity
Plakortin (1) is a remarkably simple 1,2-dioxane derivative, extracted from the marine sponge Plakortis simplex, showing a submicromolar activity against chloroquine-resistant strains of Plasmodium falciparum. Using plakortin as a novel antimalarial hit, we have prepared a series of semisynthetic derivatives in order to gain insights into the structural requirements of simple 1,2-dioxanes for exhibiting
plakortin-related metabolites containing a trisubstituted tetrahydrofuran ring. They have been isolated from the Caribbean sponge Plakortis simplex and their stereostructures fully characterized by a combination of spectroscopic data and chemical evidence, based on a three-step conversion of the cycloperoxide plakortin into plakortether B (5). Plakortethers A (4), B (5), D (7), and E (8) exhibited selective cytotoxicity
Plakortethers A-G (4-10) 代表一类新的含有三取代四氢呋喃环的 plakortin 相关代谢物。它们是从加勒比海绵 Plakortis simplex 中分离出来的,它们的立体结构完全由光谱数据和化学证据的组合表征,基于环过氧化物 plakortin 到 plakortether B 的三步转化 (5)。Plakortethers A (4)、B (5)、D (7) 和 E (8) 表现出对 RAW 264-7 细胞系(鼠巨噬细胞)的选择性细胞毒性。