Synthesis and mechanism of formation of novel 2,5-dihydro-2,5-diimino-3,4-di[(<i>N,N</i>-dimethylamino)methylideneamino]pyrroles and 5-amino-3,4-di[(<i>N,N</i>-dimethylamino)methylideneamino]-2<i>H</i>-2-iminopyrroles
作者:M. José Alves、M. Alice Carvalho、M. Fernanda、J. R. P. Proença、Brian L. Booth、Robin G. Pritchard
DOI:10.1002/jhet.5570360129
日期:1999.1
(isolated), followed by base catalysed cyclisation and imi dazole ring opening by dimethyl amine. The kinetic product of the ring opening reaction is the 2,5-diimino2,5-dihydropyrrole derivatives 11, which have been isolated and characterized spectroscopically and by a single crystal X-ray analysis on the R = Ph derivative. In solution at room temperature the N-aryl derivatives undergo a rapid Dimroth
由(Z)-N 1-(2-氨基-1,2-二氰基乙烯基)的反应形成5-氨基-3,4-二[(N,N-二甲基亚氨基)亚甲基亚氨基] -2 H -2-亚氨基吡咯3) - ñ 2 -取代-甲脒1与二甲基甲酰胺二乙基缩醛已经显示由初始形成(Z)的发生- ñ 1 - 1,2-二氰基-2- [ N,N-二甲基氨基)亚甲基氨基]乙烯基}甲脒8(分离的),然后通过二甲基胺进行碱催化的环化和咪唑环的开环。开环反应的动力学产物是2,5-二亚氨基2,5-二氢吡咯衍生物11,它们已经通过光谱分离和通过对R = Ph衍生物的单晶X射线分析来分离和表征。在室温下的溶液中,N-芳基衍生物会迅速发生Dimroth重排,从而使热力学上更稳定的异构体3发生变化,但化合物11(R = Me)在溶液中的稳定性更高。