Micelles catalyzed one pot regio- and chemoselective synthesis of benzo[a]phenazines and naphtho[2,3-d]imidazoles ‘in H2O’
作者:Vishnu K. Tandon、Manoj K. Verma、Hardesh K. Maurya、Sandeep Kumar
DOI:10.1016/j.tetlet.2014.09.103
日期:2014.11
An efficient, novel, and concise one pot regio- and chemoselective synthesis of benzo[a]phenazines (4) and naphtho[2,3-d]imidazoles (8) has been accomplished in excellent yields by nucleophilic substitution reaction of 2,3-dichloro-1,4-naphthoquinone (1) with o-phenylenediamine (2) and benzamidines (7) respectively ‘in H2O’ using base and micelles (SDS) as catalyst. Analog reaction of 2,3-dichloro-1
通过2,3的亲核取代反应,以优异的收率实现了高效,新颖,简洁的一锅区域和化学选择性合成苯并[ a ]吩嗪(4)和萘并[2,3- d ]咪唑(8)。 -二氯-1,4-萘醌(1)与邻苯二胺(2)和联am(7)分别在碱和胶束(SDS)的催化下在H 2 O中形成。在相同条件下2,3-二氯-1,4-萘醌(1)与2-氨基苯硫酚(9)的模拟反应导致形成苯并[ b]的混合物]吩噻嗪(10),苯并[ a ]吩噻嗪(11)和苯并[ a ] -1,4-苯并噻嗪基-3,2-吩噻嗪(12)的产率分别为17%,23%和57%。
Facile synthesis of new imidazoles from direct reaction of 2,3-diamino-1,4-naphthoquinone with aldehydes
作者:Ashraf A. Aly、Alaa A. Hassan、Alan B. Brown、Kamal M. El-Shaieb、Tarek M. I. Bedair
DOI:10.1002/jhet.582
日期:2011.7
New imidazoles were easily prepared from 2,3‐diamino‐1,4‐naphthoquinone and stoichiometric quantities of the appropriate aldehydes in dimethyl sulfoxide as a solvent. The reaction proceeded for few hours. The procedure can be generalized to different classes of aldehydes. 2‐Methyl‐1H‐naphtho[2,3‐d]imidazole‐4,9‐dione was also obtained in good yield during refluxing of 2,3‐diaminonaphthoquinone in acetic
由2,3-二氨基-1,4-萘醌和化学计量的适当醛在二甲亚砜中作为溶剂可以轻松制备新的咪唑。反应进行数小时。该程序可以推广到不同类别的醛。2,3-二氨基萘醌在乙酸中回流时,也能以良好的收率获得2-甲基-1 H-萘[2,3 - d ]咪唑-4,9-二酮。使用NMR实验对新合成的咪唑的结构进行了广泛的研究。J.杂环化学。(2011)。