Carboxylic Acids as Traceless Directing Groups for Formal meta-Selective Direct Arylation
作者:Josep Cornella、Marika Righi、Igor Larrosa
DOI:10.1002/anie.201103720
日期:2011.9.26
Without a trace: The first meta‐selective direct CH arylation that uses iodoarenes as coupling partners is reported (see scheme, EWG=electron‐withdrawing group). This process utilizes carboxylicacid units as temporary directinggroups that are cleaved during the reaction, leaving no trace in the resulting biaryl products.
The site-selectivity and mechanism of Pd-catalyzed C(sp<sup>2</sup>)–H arylation of simple arenes
作者:Daeun Kim、Geunho Choi、Weonjeong Kim、Dongwook Kim、Youn K. Kang、Soon Hyeok Hong
DOI:10.1039/d0sc05414c
日期:——
functionalization reactions in organic synthesis. Despite the seminal breakthrough of the Pd-catalyzed C(sp2)–H arylation of simple arenes via a concerted metalation–deprotonation (CMD) pathway in 2006, understanding the site-selectivity of the reaction still remains elusive. Here, we have comprehensively investigated the scope, site-selectivity, and mechanism of the Pd-catalyzed direct C–H arylation reaction of
<i>meta</i>-C–H arylation of fluoroarenes <i>via</i> traceless directing group relay strategy
作者:Marc Font、Andrew R. A. Spencer、Igor Larrosa
DOI:10.1039/c8sc02417k
日期:——
several methods for the ortho selective arylation of fluoroarenes, meta-functionalisation has never been achieved. We report a new methodology, based on the traceless directing group relay concept, leading to the first meta-selective (hetero)arylation of fluoroarenes. In this strategy, CO2 is introduced as a transient directing group, to control a Pd-catalysedarylation meta to the fluoro functionality,