A palladium-catalyzed alkynylation of aromatic amines with terminal alkynes via in situ formed trimethylammonium salts is developed. Compared with previous system using ammonium salts as starting materials and high loading of pre-prepared NHC-Pd catalyst (10 mol% Pd), this reaction directly employed amines as the coupling partners and the commercially available Pd2(dba)3/PPh2Cy (1 mol% Pd) as the catalyst
anilines were converted to aryl boronate esters in moderate to good yields with wide functional group tolerance under simple and ambient photochemical conditions. This transformation achieved the direct and facile C–N bond activation of unreactive anilines, providing a convenient and practical route transforming widely available anilines into useful aryl boronate esters.
Template Synthesis to Solve the Unreachable <i>Ortho</i> C–H Functionalization Reaction of Aryl Iodide
作者:Bo-Sheng Zhang、Wan-Yuan Jia、Yi-Ming Wang、João C. A. Oliveira、Svenja Warratz、Ze-Qiang Zhang、Xue-Ya Gou、Yong-Min Liang、Xi-Cun Wang、Zheng-Jun Quan、Lutz Ackermann
DOI:10.1021/acs.joc.3c02014
日期:2023.12.1
This report describes the use of a simple Pd/NBE catalytic system to achieve ortho C–H oxylation and phosphonylation and other functionalizations of aryliodide through templated conversion reactions. Dimethylamine is introduced in the ortho-site of aryliodide through C–H amination, and aryl dimethylamine is quickly converted to methyl quaternary ammonium salt precipitation. Methyl quaternary ammonium
作者:ROBERT G. JOHNSON、H. B. WILLIS、GEORGE A. MARTIN、W. H. KIRKPATRICK、JACK SWISS、HENRY GILMAN
DOI:10.1021/jo01110a022
日期:1956.4
Synthesis of Dibenzofurans via Palladium-Catalyzed Phenol-Directed C–H Activation/C–O Cyclization
作者:Bin Xiao、Tian-Jun Gong、Zhao-Jing Liu、Jing-Hui Liu、Dong-Fen Luo、Jun Xu、Lei Liu
DOI:10.1021/ja203335u
日期:2011.6.22
A practical, Pd(0)/Pd(II)-catalyzed reaction was developed for phenol-directed C-H activation/C-O cyclization using air as an oxidant. The turnover-limiting step of the process was found to be C-O reductive elimination instead of C-H activation. This reaction can tolerate a variety of functional groups and is complementary to the previous methods for the synthesis of substituted dibenzofurans.