Dialkylamino-2,4-dihydroxybenzoic Acids as Easily Synthesized Analogues of Platensimycin and Platencin with Comparable Antibacterial Properties
作者:Jingxin Wang、Herman O. Sintim
DOI:10.1002/chem.201002410
日期:2011.3.14
Function matters more than synthesis: Simple analogues of platensimycin, nanomolar inhibitors of bacterial FabF enzymes, are made in just two‐flask reactions from commercially available aldehydes. These readily synthesizedanalogues are as effective as platensimycin in killing several bacterial strains.
Total Synthesis of Platensimycin and Related Natural Products
作者:K. C. Nicolaou、Ang Li、David J. Edmonds、G. Scott Tria、Shelby P. Ellery
DOI:10.1021/ja9068003
日期:2009.11.25
chains through amide bond formation. In addition to a racemic synthesis, two asymmetric routes to the core structure are described: one exploiting a rhodium-catalyzed asymmetric cycloisomerization, and another employing a hypervalent iodine-mediated de-aromatizing cyclization of an enantiopure substrate. The final two bonds of the core structure were forged through a samarium diiodide-mediated ketyl radical
Platensimycin 是一种新的和不断增长的抗生素类别的旗舰成员,对耐药细菌具有良好的抗菌特性。描述了平板霉素及其同系物、平板霉素 B(1) 和 B(3)、平板酸、甲基平板菌酸酯、平板酰亚胺 A、homoplatensimide A 和 homoplatensimide A 甲酯的总合成。针对这些目标分子开发的收敛策略涉及构建它们的笼状核心,然后通过酰胺键形成连接各种侧链。除了外消旋合成外,还描述了两种不对称的核心结构路线:一种利用铑催化的不对称环化异构化,另一种利用高价碘介导的对映纯底物的去芳香化环化。核心结构的最后两个键是通过二碘化钐介导的羰基自由基环化和酸催化醚化形成的。涉及末端乙炔的铑催化不对称反应被开发为末端烯炔不对称环异构化的通用方法。