97528-24-0Relevant academic research and scientific papers
Equivalent Loading of Directed Arenes in Pd(II)-Catalyzed Oxidative Cross-Coupling of Aryl C-H Bonds at Room Temperature
Mei, Chong,Zhao, Mengdi,Lu, Wenjun
, p. 2714 - 2733 (2021/02/01)
The unsymmetrical biaryls (Ar1-Ar2) produced by the catalytic cross-couplings of aryl halides (Ar1-halo) with aryl metallics (Ar2-M) in the loading ratio of 1:1 are popular in chemical synthesis. In contrast, there has been less precedence on the same biaryls produced effectively from two normal aryl C-H bonds with equivalent loading. Here, we report that, in a palladium/oxidant/acid catalytic system at room temperature, one arene (Ar1-H, 1 equiv) can highly selectively couple with the other one (Ar2-H, 1 equiv) to afford the target Ar1-Ar2 just by controlling the directing groups and the substituted groups on their phenyl rings. The utility of this one-one cross-coupling is also demonstrated by synthesis of a few bioactive molecules.
Palladium(II)-Catalyzed Oxidative Homo- and Cross-Coupling of Aryl ortho -sp2 C-H Bonds of Anilides at Room Temperature
Mei, Chong,Lu, Wenjun
, p. 4812 - 4823 (2018/04/26)
The preparation of secondary 2,2'-bisanilides has been successfully achieved through an oxidative coupling of aryl ortho-sp2 C-H bonds of anilides in the presence of catalytic Pd(OAc)2 and K2S2O8 as an oxidant in MsOH/CF3CO2H (TFA) at room temperature (25 °C). The aromatic rings of anilides substituted by various electron-donating or electron-withdrawing groups are tolerant in these coupling reactions.
Palladium-Catalysed Synthesis of α-(Trifluoromethyl)styrenes by Means of Directed C-H Bond Functionalization
Zhao, Qun,Besset, Tatiana,Poisson, Thomas,Bouillon, Jean-Philippe,Pannecoucke, Xavier
, p. 76 - 82 (2016/01/26)
We report the first introduction of 2-bromo-3,3,3-trifluoropropene (BTP) by directed C-H bond functionalization. The developed method gives straightforward access to α-(trifluoromethyl)styrene derivatives without prior prefunctionalization of the substrates. This palladium-catalysed transformation was applied to a broad range of substrates, and the corresponding trifluoromethylated products were obtained in good yields. This approach represents an alternative pathway to the classical method previously used to access such molecules.
Copper-catalyzed dehydrogenative cross-coupling reactions of N-para-tolylamides through successive C-H activation: Synthesis of 4H-3,1-benzoxazines
Xiong, Tao,Li, Yan,Bi, Xihe,Lv, Yunhe,Zhang, Qian
supporting information; experimental part, p. 7140 - 7143 (2011/09/12)
A novel annulation reaction of readily available tolylamides was catalyzed by Cu(OTf)2 in the presence of Selectfluor and water through successive intermolecular C-H activated dehydrogenative cross-coupling reactions of benzylic methyl C(sp3)-H and aromatic C(sp2)-H bonds, and subsequent intramolecular C-O bond formation (see scheme). Copyright
Remote amide-directed palladium-catalyzed benzylic C-H amination with N-fluorobenzenesulfonimide
Xiong, Tao,Li, Yan,Lv, Yunhe,Zhang, Qian
supporting information; experimental part, p. 6831 - 6833 (2010/10/21)
An unprecedented remote amide-directed palladium-catalyzed intermolecular highly selective benzylic C-H amination with N-fluorobenzenesulfonimide is developed, which represents the first direct benzylic C-H amination with a non-nitrene nitrogen source. This methodology provides a novel approach to circumvent the common ortho aromatic C-H selectivity in directed palladium catalyzed C-H functionalization.
Pd-catalyzed intermolecular ortho-C-H amidation of anilides by N-nosyloxycarbamate
Ng, Ka-Ho,Chan, Albert S. C.,Yu, Wing-Yiu
supporting information; body text, p. 12862 - 12864 (2010/11/03)
A palladium-catalyzed ortho-C-H amidation of anilides by N-nosyloxycarbamates was developed for the synthesis of 2-aminoanilines. This reaction can be carried out under relatively mild conditions and exhibits excellent regioselectivity and functional group tolerance. The amidation reaction is probably initiated by rate-limiting C-H cyclopalladation (k H/kD = 3.7) to form an arylpalladium complex, followed by nitrene functionalization.
