complexes have been developed. The visible-light induced reactions can be applied for the synthesis of a series of unsymmetrical diaryl selenides employing aryl bromides, aryl iodides as well as aryl chlorides under mild reaction conditions. The scale-up was readily achieved. UV-Vis spectroscopy measurements provide insight into the reaction mechanism.
A new method of deborylative selanylation using arylboronic acids and arylseleninicacids gave diaryl selenoethers and diarylselenoxide. The present approach requires only equimolar arylseleninicacid and led selectively to selenoethers or selenoxides depending on the solvent. The method is metal-free, base- or oxidant-free, efficient, and environmentally friendly.
Cu(<scp>ii</scp>) anchored nitrogen-rich covalent imine network (Cu<sup>II</sup>-CIN-1): an efficient and recyclable heterogeneous catalyst for the synthesis of organoselenides from aryl boronic acids in a green solvent
作者:Susmita Roy、Tanmay Chatterjee、Biplab Banerjee、Noor Salam、Asim Bhaumik、Sk Manirul Islam
DOI:10.1039/c4ra08909j
日期:——
A Cu(ii)-grafted covalent imine framework material has been designed, which catalyzes the C–Se cross-coupling reactions to obtain a library of organoselenides.
offers facile access to various unsymmetrical selenium-containing motifs. The reaction features excellent functional group tolerance, wide substrate scope, good efficiency, and operates undermild reaction conditions. Notably, this protocol could be readily scaled up to gram scale without the loss of yield.
Solvent selective phenyl selenylation and phenyl tellurylation of aryl boronic acids catalyzed by Cu(II) grafted functionalized polystyrene
作者:Susmita Roy、Tanmay Chatterjee、Sk. Manirul Islam
DOI:10.1016/j.tetlet.2014.12.055
日期:2015.2
A solvent-selective methodology for the phenyl selenylation and phenyl tellurylation of aryl boronic acids has been developed for the first time using a polymer supported Cu(II) catalyst. The catalyst was synthesized by anchoring Cu(OAc)(2) onto a functionalized polystyrene with pyridine thiosemicarbazone ligand. It was then characterized properly by SEM, EDAX, FT-IR, TGA, and EPR experiments. The catalyst smoothly catalyzes phenyl selenylation of aryl boronic acids in water and phenyl tellurylation of aryl boronic acids in PEG-600, selectively. Thus a wide variety of unsymmetrical organodiaryl or aryl-heteroaryl selenides and tellurides have been synthesized by this protocol. The catalyst was recycled up to six runs without any appreciable loss of catalytic activity. (C) 2014 Elsevier Ltd. All rights reserved.