Bioactive Maleic Anhydrides and Related Diacids from the Aquatic Hyphomycete Tricladium castaneicola
摘要:
Four maleic anhydride derivatives, tricladolides A-D (1-4), and three alkylidene succinic acid derivatives, tricladic acids A-C (5-7), were isolated from the aquatic hyphomycete Tricladium castaneicola. The structures of these compounds were determined by spectroscopic analysis, and all were found to be novel. The compounds exhibited inhibitory activity against fungi, particularly Phytophthora sp., a plant pathogen of oomycetes. The inhibitory activity of these metabolites revealed the importance of the cyclic anhydride structure and the lipophilicity of the alkyl side chain. On the other hand, the cytotoxicity of the compounds against B16 melanoma cells indicated that the cyclic anhydride structure was not essential.
作者:Sirkku Nieminen、Trevor G. Payne、Peter Senn、Christoph Tamm
DOI:10.1002/hlca.19810640722
日期:1981.11.4
In order to check the hypothesis that rubratoxin B (2), a C26-metabolite, is formed biogenetically by head-to-tail coupling of two identical C13-precursors derived from decanoic acid and oxaloacetic acid, two labelled forms of the postulated C13-intermediate 2-((E)-1'-octenyl)-3-[14C]methyl- and 2-((E)-1'-octenyl)-3-[13C]-methylmaleic anhydride (10), were synthesized. The labelled compounds 10 as well
Gold-Catalyzed Cycloisomerization of Propargyl Pyruvates Enabling Unified Access to Tricladolides C and D, Chaetomellic Anhydride A, and Tyromycin A
作者:Pathan Mosim Amin、Zhenjie Su、Shaozhong Wang
DOI:10.1021/acs.joc.1c01890
日期:2021.11.5
and racemic tricladolide C has been achieved in 52 and 16% overall yields with five to seven steps starting from commercially available compounds. Further catalytic hydrogenation of alkenylated maleic anhydrides derived from γ-alkylidenebutenolides produced chaetomellic anhydride A (19% yield for six steps) and tyromycin A (15% yield for six steps), which provides flexiblesyntheticapproaches to these
金催化的炔丙基丙酮酸环异构化已被开发为制备马来酸酐型天然产物的关键反应。通过与形成的 γ-亚烷基丁烯内酯的化学选择性环氧化和环氧化物的氧化裂解相结合,首次合成三环内酯 D 和外消旋三环内酯 C 的总产率为 52% 和 16%,从市售化合物开始,经过 5 到 7 个步骤。由 γ-亚烷基丁烯内酯衍生的烯基化马来酸酐的进一步催化加氢产生了毛藻酸酐 A(六步收率为 19%)和酪霉素 A(六步收率为 15%),这为这些天然存在的二烷基化马来酸酐提供了灵活的合成方法记录在案的。
Bioactive Maleic Anhydrides and Related Diacids from the Aquatic Hyphomycete <i>Tricladium castaneicola</i>
Four maleic anhydride derivatives, tricladolides A-D (1-4), and three alkylidene succinic acid derivatives, tricladic acids A-C (5-7), were isolated from the aquatic hyphomycete Tricladium castaneicola. The structures of these compounds were determined by spectroscopic analysis, and all were found to be novel. The compounds exhibited inhibitory activity against fungi, particularly Phytophthora sp., a plant pathogen of oomycetes. The inhibitory activity of these metabolites revealed the importance of the cyclic anhydride structure and the lipophilicity of the alkyl side chain. On the other hand, the cytotoxicity of the compounds against B16 melanoma cells indicated that the cyclic anhydride structure was not essential.