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
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.
Palladium-Catalyzed C(sp<sup>3</sup>)—H Oxygenation via Electrochemical Oxidation
作者:Qi-Liang Yang、Yi-Qian Li、Cong Ma、Ping Fang、Xiu-Jie Zhang、Tian-Sheng Mei
DOI:10.1021/jacs.7b01232
日期:2017.3.1
Palladium-catalyzed C-H activation/C-O bond-forming reactions have emerged as attractive tools for organic synthesis. Typically, these reactions require strong chemical oxidants, which convert organopalladium(II) intermediates into the PdIII or PdIV oxidation state to promote otherwise challenging C-O reductive elimination. However, previously reported oxidants possess significant disadvantages, including
钯催化的 CH 活化/CO 键形成反应已成为有机合成的有吸引力的工具。通常,这些反应需要强化学氧化剂,将有机钯 (II) 中间体转化为 PdIII 或 PdIV 氧化态,以促进其他具有挑战性的 CO 还原消除。然而,先前报道的氧化剂具有显着的缺点,包括原子经济性差、成本高和形成不需要的副产物。为了克服这些问题,我们报告了一种电化学策略,该策略利用 PdII 的阳极氧化与各种氧阴离子偶联伙伴诱导选择性 CO 还原消除。
<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.