Total Synthesis of Carolacton, a Highly Potent Biofilm Inhibitor
作者:Thomas Schmidt、Andreas Kirschning
DOI:10.1002/anie.201106762
日期:2012.1.23
Metals are the key players in the synthesis of caralacton, a strong inhibitor of bacterial biofilms. The totalsynthesis is based on several metal‐mediated key transformations such as the Ley and the Duthaler–Hafner aldol reactions, the Marshall reaction and Breit's substitution, as well as the Nozaki–Hiyama–Kishi and Negishi–Fu CC coupling reactions.
A short and convergent strategy for the stereoselective total synthesis of biologically active natural product carolacton has been accomplished. Our synthesis highlights the Urpi acetal aldol, Crimmins aldol, Ireland–Claisen rearrangement, TiCl4-assisted aldol followed by β-hydroxy elimination to construct C7–C8 olefin, and ring-closing metathesis as the key steps for achieving the target molecule
作者:Michal S. Hallside、Richard S. Brzozowski、William M. Wuest、Andrew J. Phillips
DOI:10.1021/ol500004k
日期:2014.2.21
A synthesis of carolacton, a myxobacterial natural product that has profound effects on Streptococcus mutans biofilms, is reported. The synthesis proceeds via a longest linear sequence of 14 steps from an Evans beta-ketoimide and enabled preliminary evaluations of the effects of late-stage intermediates on S. mutans biofilms. These studies suggest that further investigations into carolacton's structure function relationships are warranted.
Carolacton - A Macrolide Ketocarbonic Acid that Reduces Biofilm Formation by the Caries- and Endocarditis-Associated Bacterium<i>Streptococcus mutans</i>
The macrolideketocarbonicacidcarolacton (1) was isolated from the myxobacterium Sorangium cellulosum, strain So ce960, because of its antibiotic activity. Subsequently, carolacton (1) was discovered to be a highly potent agent against biofilms containing the caries- and endocarditis-associated bacterium Streptococcus mutans. The 2D structure of 1 was elucidated by HRMS, IR and 2D NMR spectroscopy
大环内酯酮碳酸carolacton (1) 是从粘杆菌Sorangium cellulosum, So ce960 菌株中分离出来的,因为它具有抗生素活性。随后,carolacton (1) 被发现是一种高效的生物膜药剂,可以对抗含有龋齿和心内膜炎相关细菌变形链球菌的生物膜。通过HRMS、IR和2D NMR光谱阐明了1的2D结构。最初,立体中心是通过化学衍生结合计算方法确定的,最后通过 X 射线分析进行验证。