On a new synthesis of sterpurene and the bioactivity of some related <i>Chondrostereum</i><i>purpureum</i> sesquiterpene metabolites
作者:George M. Strunz、Richard Bethell、Michael T. Dumas、Nick Boyonoski
DOI:10.1139/v97-090
日期:1997.6.1
mycoherbicide, was synthesized by a six-step sequence, in 33% overall yield. The key steps were a thermal [4 + 2] (Diels–Alder) cycloaddition of a ketene acetal diene with a conjugated ester dienophile, and a remarkably stereoselective [2 + 2] photocycloaddition of ethylene with the resulting conjugated ketone. Several related, more highly oxygenated, metabolites isolated from culture filtrates of C. purpureum
Sterpurene 是 Chondrostereumpurpureum 的倍半萜烃代谢物,是一种植物病原体和潜在的除真菌剂,通过六步序列合成,总产率为 33%。关键步骤是乙烯酮缩醛二烯与共轭酯亲二烯体的热 [4 + 2] (Diels-Alder) 环加成,以及乙烯与所得共轭酮的显着立体选择性 [2 + 2] 光环加成。从 C. purpureum (cf. Ayer) 的培养滤液中分离出的几种相关的、氧化程度更高的代谢物进行了对杂种白杨、Populusdeltoides X nigra 细胞的毒性测试。它们的植物毒性,浓度低至 10 ppm,表明,就像真菌产生的内聚半乳糖醛酸酶一样,这些倍半萜烯可能是造成与落叶物种被病原体感染相关的叶损伤的部分原因。关键词: Chondrostereumpurpureum, mycoherbicide, 代谢物, sterpurenes, 合成, Diels-Alder