Glyclauxins A–E: Dimeric Oxaphenalenone Aminoglycosides from an Australian Wasp Nest-Derived Fungus <i>Talaromyces</i> sp. CMB-MW102
作者:Kaumadi Samarasekera、Waleed M. Hussein、Taizong Wu、Angela A. Salim、Robert J. Capon
DOI:10.1021/acs.jnatprod.2c01069
日期:2023.3.24
exposure of duclauxin (1) to synthetic 1-deoxy-d-glucosamine yielded glyclauxin B (3), while on handling and storage, glyclauxins C (4) and D (5) (bearing a 7-OMe moiety) proved chemically labile and underwent quantitative transformation to glyclauxins B (3) and A (2), respectively. These latter observations on chemical reactivity and stability informed a proposed biogenetic relationship linking all
昆士兰泥浆涂抹蜂巢衍生真菌Talaromyces sp. 培养物的化学分析。CMB-MW102,产生了已知的二聚氧杂酚烯酮 duclauxin ( 1 ) 以及一系列新的 1-脱氧-d-葡萄糖胺加合物,glylauxins A–E ( 2–6 )。尽管2-6的 1D NMR 光谱因所选共振的扩大而受到损害,但包括绝对配置在内的结构是根据详细的光谱分析和生物遗传学考虑以及仿生半合成和化学相互转化分配的。例如,将 duclauxin ( 1 ) 暴露于合成的 1-脱氧-d-葡糖胺产生糖基白蛋白 B ( 3 ),而在处理和储存时,糖基白蛋白 C ( 4 ) 和 D ( 5 )(带有 7-OMe 部分)被证明是化学不稳定的,并经历了向糖基白蛋白 B ( 3 ) 和 A ( 2 ) 的定量转化), 分别。后面这些关于化学反应性和稳定性的观察结果表明了一种拟议的生物遗传关系,该关系将所有已知的延伸的杜
Talauxins: Hybrid Phenalenone Dimers from <i>Talaromyces stipitatus</i>
作者:Nirmal K. Chaudhary、Andrew Crombie、Daniel Vuong、Ernest Lacey、Andrew M. Piggott、Peter Karuso
DOI:10.1021/acs.jnatprod.9b01066
日期:2020.4.24
library of natural and unnatural talauxins. Talauxin V was shown to undergo spontaneous elimination of methyl acetate to yield the corresponding neoclauxin scaffold. This process was modeled using density functional theory calculations, revealing a dramatic change in conformation resulting from the synelimination of methyl acetate.