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para ‐Selective Arylation of Arenes: A Direct Route to Biaryls by Norbornene Relay Palladation
Author(s) -
Dutta Uttam,
Porey Sandip,
Pimparkar Sandeep,
Mandal Astam,
Grover Jagrit,
Koodan Adithyaraj,
Maiti Debabrata
Publication year - 2020
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.202005664
Subject(s) - norbornene , chemistry , aryl , reactivity (psychology) , phenols , combinatorial chemistry , benzene derivatives , stereochemistry , organic chemistry , chemical synthesis , monomer , medicine , alternative medicine , pathology , in vitro , polymer , biochemistry , alkyl
Biaryl compounds are extremely important structural motifs in natural products, biologically active 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 norbornene and subsequently para ‐C−H arylation is achieved for sulfonates, phosphonates and phenols bearing 2,6‐disubstitution patterns. The protocol is amenable to electron‐deficient aryl iodides. Multisubstituted arenes and phenols are obtained by postsynthetic modification of the products. The protocol allows the synthesis of hexa‐substituted benzene by sequential selective distal C−H functionalization.