Practical Multi-Component Synthesis of <i>Di</i>- or <i>Tri</i>-Aryl (Heteraryl) Substituted 2-(Pyridin-2-yl)imidazoles from Simple Building Blocks
作者:Xiao-Jin Wu、Ran Jiang、Xiao-Ping Xu、Xiao-Ming Su、Wei-Hong Lu、Shun-Jun Ji
DOI:10.1021/cc100079b
日期:2010.11.8
efficient multicomponent protocol has been developed for the synthesis of various poly-substituted 2-(pyridin-2-yl)imidazoles from 2-cyanopyridine, corresponding aromatic aldehydes, and NH4OAc/primary amine. Notably, tri-substituted 2-(pyridin-2-yl)imidazoles were highly yielded when aromatic primary amines were used as substrates, but both di- and tri-substituted 2-(pyridin-2-yl)imidazoles were obtained
Microwave Enabled Umpulong Mechanism Based Rapid and Efficient Four- and Six-Component Domino Formations of 2-(2′-Azaaryl)imidazoles and <i>anti</i>-1,2-Diarylethylbenzamides
作者:Bo Jiang、Xiang Wang、Feng Shi、Shu-Jiang Tu、Teng Ai、Austin Ballew、Guigen Li
DOI:10.1021/jo902204s
日期:2009.12.18
Concise and efficient six-component and four-component domino approaches to anti-1,2-diarylethylbenzamides and highly Substituted 2-(2'-azaaryl)imidazoles have been developed under solvent-free and microwave-irradiation conditions. The reactions showed a broad scope of substrates in which a wide range of common commercial aromatic aldehydes and heteroaryl nitriles can be used. The syntheses were Finished within short periods (15-34 min) with good to excellent chemical yields and stereoselectivity that avoided tedious workup isolations. New mechanisms involving an umpolung have been proposed for these two reaction processes.
Mechanofluorochromism based on BOPIM complexes: The effect of substituents and regulation of the direction of the emission color changes
作者:Yong Zhan、Xin Wang、Yunhan Wang、Yongnan Xu
DOI:10.1016/j.dyepig.2019.04.001
日期:2019.8
Novel boron 2-(2′-pyridyl)imidazole (BOPIM) complexes T1, T2 and T3 with different substituents (including bromo, tert-butyl and methoxyl) on the benzene ring of BOPIM dyes have been designed and synthesized, and their optical properties in both solution and the solid state were investigated and compared. The three compounds exhibited typical intramolecular charge transfer (ICT) characteristics. Solvent-dependent
Novel non‐aggregated boron–fluorinederivatives with large Stokes shift were facilely synthesized and characterized. These dyes show moderate absorptive coefficients and intense fluorescence emission, and excellent photo‐stability in solvents and also in solid state. According to X‐ray single‐crystal analysis, non‐covalent intermolecular interactions provide a rigid structure, which inhibits aggregate