<i>para</i>-Selective copper-catalyzed C(sp<sup>2</sup>)–H amidation/dimerization of anilides <i>via</i> a radical pathway
作者:Amol B. Viveki、Dnyaneshwar N. Garad、Rajesh G. Gonnade、Santosh B. Mhaske
DOI:10.1039/c9cc09824k
日期:——
Copper-catalyzed amidation/dimerization of anilides via regioselective C(sp2)-H functionalization is achieved. The para-selective amidation is accomplished on the anilide aromaticringvia a radicalpathway leading to C-N bond formation in the presence of ammonium persulfate as a radical source/oxidant for the copper catalyst. The developed protocol tolerates a wide range of anilide substrates. The
A Convenient Synthesis of Carboxanilides from Silyl Carboxylates and Weakly Nucleophilic Anilines Using<i>p</i>-Trifluoromethylbenzoic Anhydride and a Catalytic Amount of Active Titanium(IV) Salt
Various carboxanilides are prepared in excellent yields from nearly equimolar amounts of silyl carboxylates and the corresponding weakly nucleophilic anilines under mild conditions by using p-trifluoromethylbenzoic anhydride and a catalytic amount of active titanium(IV) salt.
In the presence of a catalytic amount of active titanium(IV) salt generated in situ from 1 mol of TiCl4 and 2 mol of AgOTf, weakly nucleophilic anilines react under mild conditions with nearly equimolar amounts of silyl carboxylates to afford the corresponding anilides in excellent yields using 4-(trifluoromethyl)benzoic anhydride. The mixed anhydride formed in situ from trimethylsily acetate and 4-(trifluoxomethyl)benzoic anhydride, a key intermediate of this reaction, was detected by 1H NMR experiment. Further, it was shown that the reaction of the mixed anhydrides and 2-nitroaniline was faster than that of the corresponding homo anhydrides and 2-nitroaniline.
An Annulative Synthetic Strategy for Building Triphenylene Frameworks by Multiple C−H Bond Activations
作者:Bijoy P. Mathew、Hyun Ji Yang、Joohee Kim、Jae Bin Lee、Yun-Tae Kim、Sungmin Lee、Chang Young Lee、Wonyoung Choe、Kyungjae Myung、Jang-Ung Park、Sung You Hong
DOI:10.1002/anie.201700405
日期:2017.4.24
C−H activation is a versatile tool for appending aryl groups to aromatic systems. However, heavy demands on multiple catalytic cycle operations and site‐selectivity have limited its use for graphene segment synthesis. A Pd‐catal‐ yzed one‐step synthesis of functionalized triphenylene frameworks is disclosed, which proceeds by 2‐ or 4‐fold C−H arylation of unactivated benzene derivatives. A Pd2(dibenzylideneacetone)3
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.