meta-C-H arylation of fluoroarenes via traceless directing group relay strategy.
meta-C-H arylation of fluoroarenes via traceless directing group relay strategy.
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DOI:
10.1039/c8sc02417k
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发表时间:
2018-09-21
期刊:
影响因子:
8.4
通讯作者:
Larrosa I
中科院分区:
文献类型:
--
作者:
Font M;Spencer ARA;Larrosa I
The first example of direct meta-C–H arylation of fluoroarenes to provide valuable meta-fluorobiaryls is achieved by exploiting CO2 as a transient directing group that enables complete regiochemical control of the arylation event. While 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-catalysed arylation meta to the fluoro functionality, prior to its release in a sequential, one-pot fashion. This method has shown compatibility with a number of functional groups and substitution patterns in both the fluoroarene core and aryl iodide coupling partners, and proceeds with complete meta-selectivity and mono vs. bis-arylation selectivity.
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