<i>para</i>
‐Selective Arylation of Arenes: A Direct Route to Biaryls by Norbornene Relay Palladation
作者:Uttam Dutta、Sandip Porey、Sandeep Pimparkar、Astam Mandal、Jagrit Grover、Adithyaraj Koodan、Debabrata Maiti
DOI:10.1002/anie.202005664
日期:2020.11.16
components and pharmaceuticals. Selective synthesis of biaryls by distinguishing the subtle reactivity difference of distal arene C−H bonds are significantly challenging. Herein, we describe para‐selective C−H arylation, which is acheived by a unique combination of a meta‐directing group and norbornene as a transient mediator. Upon direct meta‐C−H palladation, one‐bond relay palladation occurs in presence of
联芳基化合物是天然产物,生物活性成分和药物中极为重要的结构基序。通过区分远端芳烃CH键的微妙的反应性差异来选择性合成联芳基具有很大的挑战性。在本文中,我们描述了对位选择性CH芳基化,这是通过元导向基团和降冰片烯作为瞬时介体的独特组合而实现的。当直接元-C-H palladation,一键中继palladation发生在降冰片烯和随后的存在对带有2,6-二取代模式的磺酸盐,膦酸盐和苯酚可实现‐CH芳基化反应。该协议适用于缺电子的芳基碘化物。通过产物的后合成改性获得多取代的芳烃和苯酚。该协议允许通过顺序选择性的远端CH功能化来合成六取代的苯。