Palladium-Catalyzed Oxygenation of Unactivated sp3 C−H Bonds
摘要:
This communication describes a new palladium-catalyzed method for the oxygenation of unactivated sp3 C-H bonds. A wide variety of alkane substrates containing readily available oxime and/or pyridine directing groups are oxidized with extremely high levels of chemo-, regio-, and in some cases diastereoselectivity. The substrate scope of these reactions is discussed, and the high selectivities are rationalized on the basis of the requirements of putative palladium alkyl intermediates.
Iridium(III)-Catalyzed Direct Arylation of C–H Bonds with Diaryliodonium Salts
作者:Pan Gao、Wei Guo、Jingjing Xue、Yue Zhao、Yu Yuan、Yuanzhi Xia、Zhuangzhi Shi
DOI:10.1021/jacs.5b06758
日期:2015.9.30
arylation of complex compounds. Mechanistic studies by density functional theory calculations suggested that the sp(3) C-H activation was realized by a triflate-involved concerted metalation-deprotonation process, and the following oxidation of Ir(III) to Ir(V) is the most favorable when a bistriflimide is contained in the diaryliodonium salt. Calculations indicated that both steps are enabled by initial anion
<i>β</i>-Arylation of oxime ethers using diaryliodonium salts through activation of inert C(sp)–H bonds using a palladium catalyst
作者:Jing Peng、Chao Chen、Chanjuan Xi
DOI:10.1039/c5sc03903g
日期:——
Palladium catalyzed selectiveβ-arylation of oxime ethers was realized using diaryliodonium salts as the key arylation reagents.
钯催化的氧肟醚的选择性β-芳基化反应是利用二芳基碘盐作为关键的芳基化试剂实现的。
Synthesis, structure and comparative stability of β-hydrazono, oximino methyl ether and imino boronates
作者:Richard J. Mears、Helen E. Sailes、John P. Watts、Andrew Whiting
DOI:10.1039/b004573j
日期:——
prepared by the sequential lithiation of the corresponding methyl hydrazone or oxime methyl ether, followed by reaction with an iodomethylboronate ester, typically in the form of the pinacol ester. The resulting products have contrasting hydrolytic stabilities. β-Hydrazono boronates are highly sensitive to intramolecularly catalysed hydrolysis, providing the corresponding β-keto boronates in generally high
Palladium-Catalyzed Oxygenation of Unactivated sp<sup>3</sup> C−H Bonds
作者:Lopa V. Desai、Kami L. Hull、Melanie S. Sanford
DOI:10.1021/ja046831c
日期:2004.8.1
This communication describes a new palladium-catalyzed method for the oxygenation of unactivated sp3 C-H bonds. A wide variety of alkane substrates containing readily available oxime and/or pyridine directing groups are oxidized with extremely high levels of chemo-, regio-, and in some cases diastereoselectivity. The substrate scope of these reactions is discussed, and the high selectivities are rationalized on the basis of the requirements of putative palladium alkyl intermediates.