Study of the nucleophilic behaviour of N-phenylbenzamidine towards 1,2-diaza-1,3-dienes: domino reactions for imidazole scaffolds
作者:Orazio A. Attanasi、Silvia Bartoccini、Gianluca Giorgi、Fabio Mantellini、Francesca R. Perrulli、Stefania Santeusanio
DOI:10.1016/j.tet.2010.04.108
日期:2010.7
Depending on the nature of the solvent, alcohol or DMF, N-phenylbenzamidine shows different nucleophilic behaviour towards the conjugated azo–ene system of 1,2-diaza-1,3-dienes. In alcohol it reacts as a nucleophile through the N-phenyl imino nitrogen affording spiro pyrroloimidazoles and 1,3-diphenyl-1H-imidazoles. In DMF, by contrast, it behaves as nucleophile mainly by means of the imino amidino
根据溶剂,醇或DMF的性质,N-苯基苯甲m对1,2-二氮杂1,3-二烯的共轭偶氮烯系统表现出不同的亲核行为。在醇中,它作为亲核试剂通过N-苯基亚氨基氮反应生成螺环吡咯并咪唑和1,3-二苯基-1 H-咪唑。相反,在DMF中,它主要通过亚氨基a基氮而表现为亲核试剂,通过苯胺分子的损失提供2-苯基咪唑衍生物。