Synthesis of Isoindolo[2,1-a]quinazoline, Isoindolo[2,1-a]pyrrolo [2,1-c]quinoxalinone, and Indolo[1,2-a]isoindolo[1,2-c]quinoxalinone Derivatives in a Deep Eutectic Solvent
作者:Prakash Bhate、Rajkumari Devi、Ashok Garande
DOI:10.1055/s-0036-1588074
日期:——
2-Formylbenzoic acid reacts with various derivatives of 2-aminobenzamide, 2-(1 H -pyrrol-1-yl)aniline or 2-(1 H -indol-1-yl)aniline in a deep eutectic solvent to give the corresponding derivatives of 6,6a-dihydroisoindolo[2,1- a ]quinazoline-5,11-dione, isoindolo[2,1- a ]pyrrolo[2,1- c ]quinoxalin-10(14b H )-one, and indolo[1,2- a ]isoindolo[1,2- c ]quinoxalin-11(15b H )-one, respectively . This protocol
Lewis Acid-Catalyzed Selective Synthesis of Diversely Substituted Indolo- and Pyrrolo[1,2-a]quinoxalines and Quinoxalinones by Modified Pictet-Spengler Reaction
作者:Akhilesh K. Verma、Rajeev R. Jha、V. Kasi Sankar、Trapti Aggarwal、Rajendra P. Singh、Ramesh Chandra
DOI:10.1002/ejoc.201101013
日期:2011.12
An efficient tandem process for the selectivesynthesis of 1,2-annulated α-fused quinoxalines using benzotriazole methodology by a modifiedPictet–Spenglerreaction is described. The approach involves the reaction of arylamines 4 with aromatic aldehydes 5 to furnish 6-endo-dig-cyclized products. Dihydroquinoxalines 6 were selectively obtained by using AlCl3 in tetrahydrofuran (THF) at room temperature