Insights into directing group ability in palladium-catalyzed C-H bond functionalization.

Insights into directing group ability in palladium-catalyzed C-H bond functionalization.
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DOI:
10.1021/ja8045519
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发表时间:
2008-10-08
影响因子:
15
通讯作者:
Sanford, Melanie S.
Sanford, Melanie S.
中科院分区:
化学1区
文献类型:
--
作者:
Desai, Lopa V.;Stowers, Kara J.;Sanford, Melanie S.

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This paper describes a detailed investigation of factors controlling the dominance of a directing group in Pd-catalyzed ligand-directed arene acetoxylation. Mechanistic studies, involving reaction kinetics, Hammett analysis, kinetic isotope effect experiments, and the kinetic order in various reagents, have been conducted for a series of different substrates. Initial rates studies of substrates bearing different directing groups showed that these transformations are accelerated by the use of electron withdrawing directing groups. However, in contrast, under conditions where two different directing groups are in competition with one another in the same reaction flask, substrates with electron donating directing groups react preferentially. These results are discussed in the context of the proposed mechanism for Pd-catalyzed arene acetoxylation.
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