Increasing the Structural Span of Alkyne Metathesis
作者:Peter Persich、Josep Llaveria、Rudy Lhermet、Teresa de Haro、Robert Stade、Azusa Kondoh、Alois Fürstner
DOI:10.1002/chem.201302320
日期:2013.9.23
new generation of alkyne metathesis catalysts, which are distinguished by high activity and an exquisite functional group tolerance, allows the scope of this transformation to be extended beyond its traditional range. They accept substrates that were previously found problematic or unreactive, such as propargyl alcohol derivatives, electron‐deficient and electron‐rich acetylenes of various types, and
Condensation of Macrocyclic Polyketides Produced by <i>Penicillium</i> sp. DRF2 with Mercaptopyruvate Represents a New Fungal Detoxification Pathway
作者:Marcos V. de Castro、Laura P. Ióca、David E. Williams、Bruna Z. Costa、Carolina M. Mizuno、Mario F. C. Santos、Karen de Jesus、Éverton L. F. Ferreira、Mirna H. R. Seleghim、Lara D. Sette、Edenir R. Pereira Filho、Antonio G. Ferreira、Natália S. Gonçalves、Raquel A. Santos、Brian O. Patrick、Raymond J. Andersen、Roberto G. S. Berlinck
DOI:10.1021/acs.jnatprod.6b00295
日期:2016.6.24
curvularin-related polyketides by a marine-derived Penicillium sp. DRF2 resulted in the isolation and identification of cyclothiocurvularins 6–8 and cyclosulfoxicurvularins 10 and 11, novel curvularins condensed with a mercaptolactate residue. Two additional new curvularins, 3 and 4, are also reported. The structures of the sulfur-bearing curvularins were unambiguously established by analysis of spectroscopic
应用经过改进的实验设计和化学计量分析程序,以改善海洋来源的青霉菌产生的与弯曲素相关的聚酮化合物的能力。DRF2导致分离和cyclothiocurvularins鉴定6 - 8和cyclosulfoxicurvularins 10和11与mercaptolactate残余物冷凝,新颖curvularins。还报道了另外两种新的curvularins 3和4。通过分析光谱数据和通过X射线衍射分析,明确地确定了含硫的屈维维林的结构。[U– 13 C 3的稳定同位素进料实验的分析15 N] -升-半胱氨酸证实了2-羟基-3-巯基丙酸残基的存在下,在6 - 8,并在氧化亚砜10和11。Cyclothiocurvularins A(6)和B(7)是由10,11-脱氢curvularin(2)和巯基丙酮酸(12)通过半胱氨酸转氨作用而自发反应形成的。高比例的[U– 13 C 3 15 N] -1-半胱氨