Spherical CuO Nanoparticles as Catalyst for Chan–Lam Cross-Coupling Reaction under Base Free Condition
作者:Sameeran Kumar Das、Pangkita Deka、Monikha Chetia、Ramesh C. Deka、Pankaj Bharali、Utpal Bora
DOI:10.1007/s10562-017-2278-z
日期:2018.2
An easy methodology has been developed for the N-arylation of imidazole with arylboronic acid in absence of base and ligand with the aid of as-synthesized CuO nanoparticles. The CuO nanoparticles have been synthesized via precipitation route. The as-synthesized copper oxide nanoparticles are well characterized by various analytical and spectroscopic techniques, such as powder XRD, Raman spectroscopy, TEM and BET surface area analyses. The CuO nanoparticles appear as spherical in shape with a surface area of 15.4 m(2)/g. The mentioned reaction successfully proceeds at moderate temperature in presence of the as-synthesized nanoparticles. The protocol is applicable to a wide variety of electronically diverse precursor moieties signifying its well applicability.Graphical Abstract[GRAPHICS].
US5182268A
申请人:——
公开号:US5182268A
公开(公告)日:1993-01-26
Synthesis and Study of 1-Aryl-1<b>
<i>H</i>
</b>-4,5-dihydroimidazoles
An easy synthesis of 1-aryl-1H-4,5-dihydroimidazoles 1 by cyclocondensation of N-aryl-N′-formylethylenediamines 2 is described. Such precursors were synthesized by selective formylation of N-arylethylenediamines 3 with p-nitrophenyl formate. Cyclizations were performed using trimethylsilyl polyphosphate. Chemical properties of compounds 1, typical of amidine system, were studied. Reaction of 1 with methyl iodide leads to the corresponding 1-aryl-3-methyl-1H-4,5-dihydroimidazolium salts 5. Reduction of dihydroimidazoles 1 with sodium cyanoborohydride provides a convenient access to N-aryl-N′-methylethylenediamines 4.