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Synergistic Catalysis: Pd(II) Catalyzed Oxidation of 1,4-Dihydroquinones in the Pd(II) Catalyzed 1,4-Oxidation of Cyclic 1,3-Dienes.

作者信息

Zheng Bin, Schmidt Michael A, Eastgate Martin D

机构信息

Chemical Development, Bristol-Myers Squibb, 1 Squibb Drive, New Brunswick, New Jersey 08903, United States.

出版信息

J Org Chem. 2016 Apr 15;81(8):3112-8. doi: 10.1021/acs.joc.5b02769. Epub 2016 Mar 28.

DOI:10.1021/acs.joc.5b02769
PMID:26925844
Abstract

Palladium(II) carboxylate salts have been shown to catalyze the oxidation of various hydroquinones to benzoquinones in the presence of t-BuOOH. This new catalytic system has been integrated into the oxidative 1,4-functionalization of cyclic 1,3-dienes where the palladium plays a remarkable dual role, catalyzing both the diene oxidation itself and the regeneration of the active quinone oxidant, which is required for diene functionalization. These new conditions offer considerable increases in reaction rate over prior art and allow a significant decrease in the equivalents of the nucleophilic carboxylate required for full conversion.

摘要

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引用本文的文献

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Benzoquinone Cocatalyst Contributions to DAF/Pd(OAc)-Catalyzed Aerobic Allylic Acetoxylation in the Absence and Presence of a Co(salophen) Cocatalyst.在不存在和存在Co(salophen)助催化剂的情况下,苯醌助催化剂对DAF/Pd(OAc)催化的有氧烯丙基乙酰氧基化反应的贡献。
ACS Catal. 2021 Jun 4;11:6363-6370. doi: 10.1021/acscatal.1c01074. Epub 2021 May 13.
2
Sustainable Pd(OAc) /Hydroquinone Cocatalyst System for Cis-Selective Dibenzoyloxylation of 1,3-Cyclohexadiene.可持续的 Pd(OAc)/对苯二酚共催化剂体系用于顺式选择性二苯甲酰化 1,3-环己二烯。
Angew Chem Int Ed Engl. 2021 Oct 18;60(43):23182-23186. doi: 10.1002/anie.202108499. Epub 2021 Sep 17.
3
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供体配体能否使 Pd(OAc)2 成为更强的氧化剂?通过 Pd(II)/对苯二酚氧化还原平衡来获得难以捉摸的钯(II)还原电势和辅助配体的影响。
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