Palladium(II)-Catalyzed Oxidative Homo- and Cross-Coupling of Aryl <i>ortho</i>-sp<sup>2</sup> C–H Bonds of Anilides at Room Temperature
作者:Chong Mei、Wenjun Lu
DOI:10.1021/acs.joc.8b00120
日期:2018.4.20
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 roomtemperature (25 °C). The aromatic rings of anilides substituted by various electron-donating or electron-withdrawing groups are tolerant in these coupling reactions
通过在催化性Pd(OAc)2和K 2 S 2 O 8作为氧化剂的存在下,通过对苯甲酸酯的芳基邻-sp 2 C-H键进行氧化偶联,成功地完成了2,2'-双苯胺的制备。在室温(25°C)下在MsOH / CF 3 CO 2 H(TFA)中溶解。在这些偶联反应中,被各种给电子或吸电子基团取代的苯甲酸酯的芳环是可容忍的。
Pd-Catalyzed Intermolecular <i>ortho</i>-C−H Amidation of Anilides by <i>N</i>-Nosyloxycarbamate
作者:Ka-Ho Ng、Albert S. C. Chan、Wing-Yiu Yu
DOI:10.1021/ja106364r
日期:2010.9.22
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 mildconditions and exhibits excellent regioselectivity and functional group tolerance. The amidation reaction is probably initiated by rate-limiting C-H cyclopalladation (k(H)/k(D) = 3.7) to form an arylpalladium complex
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
Equivalent Loading of Directed Arenes in Pd(II)-Catalyzed Oxidative Cross-Coupling of Aryl C–H Bonds at Room Temperature
作者:Chong Mei、Mengdi Zhao、Wenjun Lu
DOI:10.1021/acs.joc.0c02722
日期:2021.2.5
cross-couplings of aryl halides (Ar1–halo) with aryl metallics (Ar2–M) in the loading ratio of 1:1 are popular in chemicalsynthesis. 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
Silver-Catalyzed Chemo- and Regioselective Nitration of Anilides
作者:Ebrahim Kianmehr、Sepideh Bahrami Nasab
DOI:10.1002/ejoc.201800779
日期:2018.12.13
A highly regioselective silver‐catalyzed nitration of anilides through C–H bond functionalization produces the corresponding ortho‐nitroanilides moderate to good yields. The reaction proceeds with NaNO2 as the nitration agent.