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.
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