Metal-free regioselective hydrobromination of alkynes through C H/C Br activation
摘要:
A metal-free regioselective hydrobromination of alkynes has been developed to provide the Markovnikov-type vinyl bromides in good yields using dibromomethane/N,N-dimethylaniline as in-situ 'HBr' source. This protocol also represents an elegant example of the activation of sp(2) C-H and C-Br bonds in one pot, in which 'HBr' is generated and transferred under mild metal-free conditions. D-incorporated experiments were employed to investigate the reaction mechanism and a plausible reaction path was proposed. (C) 2014 Elsevier Ltd. All rights reserved.
Catalytic Arene H/D Exchange with Novel Rhodium and Iridium Complexes
作者:Jennifer L. Rhinehart、Kimberly A. Manbeck、Sara K. Buzak、Geoffrey M. Lippa、William W. Brennessel、Karen I. Goldberg、William D. Jones
DOI:10.1021/om2012419
日期:2012.3.12
Three novel pendant acetate complexes, [Rh(bdmpza)Cl3]−M+, [Rh(bdmpza)Cl2(py)], and [Ir(bdmpza)Cl3]−M+ (bdmpza = bis(3,5-dimethylpyrazol-1-yl) acetate, M+ = Li+, Na+), were synthesized. Abstraction of halide from these complexes with silver salts yielded species capable of C–H activation of arenes. The catalytic H/Dexchange reaction between benzene and trifluoroacetic acid-d was optimized, and these
Palladium/Copper-Catalyzed Oxidative CH Alkenylation/N-Dealkylative Carbonylation of Tertiary Anilines
作者:Renyi Shi、Lijun Lu、Hua Zhang、Borui Chen、Yuchen Sha、Chao Liu、Aiwen Lei
DOI:10.1002/anie.201303911
日期:2013.9.27
CH/CN activation: The first palladium/copper‐catalyzed aerobic oxidative CH alkenylation/N‐dealkylative carbonylation of tertiary anilines has been developed. Various functional groups were tolerated and acrylic ester could also be suitable substrates. This transformation provided efficient and straightforward synthesis of biologically active 3‐methyleneindolin‐2‐one derivatives from cheap and simple
Ç H / C Ñ活化:第一钯/铜催化氧化好氧Ç ħ烯基/ Ñ叔苯胺-dealkylative羰基化得到了发展。可以容忍各种官能团,丙烯酸酯也可以用作合适的底物。这种转化提供了从廉价,简单的底物中高效,直接地合成具有生物活性的3-亚甲基吲哚-2-酮衍生物的功能。
Rh-catalyzed aerobic oxidative cyclization of anilines, alkynes, and CO
作者:Xinyao Li、Jun Pan、Hao Wu、Ning Jiao
DOI:10.1039/c7sc02181j
日期:——
Transition-metal-catalyzed oxidative C-H cyclization of anilines has been an attractive and powerful strategy for the efficient construction of N-heterocycles. However, the primary and tertiary anilines are rarely employed in this strategy due to the relatively unstability with strong oxidants or the presence of three C-N bonds. By using aerobic oxidative protocol, we describe here a novel Rh-catalyzed
Efficient Continuous-Flow H–D Exchange Reaction of Aromatic Nuclei in D2O/2-PrOH Mixed Solvent in a Catalyst Cartridge Packed with Platinum on Carbon Beads
Herein, a continuous-flow deuteration methodology for various aromaticcompounds is developed based on heterogeneous platinum-catalyzed hydrogen-deuterium exchange. The reaction entailed the transf...
ortho-alkylation of N,N-dimethylanilines via C–H addition to alkenes was achieved for the first time using a cationic half-sandwich yttrium catalyst. This protocol constitutes a straightforward and atom-economical route for the synthesis of a new family of tertiary aniline derivatives with branched alkyl substituents, which are otherwise difficult to obtain. DFT calculation studies suggest that the interaction