作者:Javorská, Žaneta、Rimpelová, Silvie、Labíková, Magdaléna、Perlíková, Pavla
DOI:10.1039/d4ob00634h
日期:——
late-stage modifications at position 10 of the cytochalasan scaffold. Iron-mediated cross-coupling reactions with corresponding Grignard reagents were used to introduce aryl or benzyl groups in position 10, resulting in the synthesis of six new cytochalasan analogues bearing non-natural aromatic residues. This methodology enables further exploration of modifications at this position and SAR studies among
细胞松弛聚糖是已知可抑制肌动蛋白聚合的真菌代谢物。尽管其具有显着的生物活性,但对细胞松弛素支架的构效关系(SAR)的研究却很少。结构修饰的全部潜力在很大程度上仍未得到开发。细胞松弛素支架10位的取代基源自掺入细胞松弛素核心的氨基酸,从而限制了天然产物中该位置的结构变异性。此外,该位置的修饰只能通过使用修饰氨基酸的半合成或变合成方法来实现。本文介绍了一种对 cytochalasan 支架的 10 位进行后期修饰的模块化方法。使用铁介导的与相应格氏试剂的交叉偶联反应在 10 位引入芳基或苄基,从而合成了六种带有非天然芳香残基的新细胞松弛素类似物。该方法能够进一步探索该位置的修饰以及细胞松弛素类似物的 SAR 研究。
Catalytic Asymmetric Intramolecular [4+2] Cycloaddition of In Situ Generated <i>ortho</i>
-Quinone Methides
作者:Youwei Xie、Benjamin List
DOI:10.1002/anie.201612149
日期:2017.4.24
Herein, we describe the first catalytic asymmetricintramolecular [4+2] cycloaddition of in situ generated ortho‐quinone methides. In the presence of a confined chiral imidodiphosphoric acid catalyst, various salicylaldehydes react with dienyl alcohols to give transient ortho‐quinone methide intermediates, which undergo an intramolecular [4+2] cycloaddition to provide highly functionalized furanochromanes