A Green Synthesis of Indolo[2,3-<i>b</i>]Quinoxaline Derivatives
作者:Hong Zhang
DOI:10.3184/174751914x14146737095013
日期:2014.12
A simple, efficient and eco-friendly synthesis of a series of structurally new indolo[2,3-b]quinoxalinederivatives has been developed. The synthesis mainly relies on the condensation reaction of various isatins with o-phenylenediamine in water with the use of benzyltriethylammonium chloride as catalyst. The protocol is very simple, avoids toxic solvents and catalysts, is easy to work-up and is thus
<i>β</i>-cyclodextrin mediated synthesis of indole derivatives: reactions of isatins with 2-amino(or 2-thiole)anilines by supramolecular catalysis in water
作者:Km Neha Shivhare、I. R. Siddiqui
DOI:10.1080/10610278.2018.1529315
日期:2019.1.2
ABSTRACT An elegant, mild, and straightforward strategy for the synthesis of indole derivatives have been accomplished by the biomimetic catalysis for the first time in waterunderneutralconditions. This supramolecularcatalyst oriented methodology provides a sustainable and green protocol for the synthesis of 6H-indolo[2,3-b]quinoxalines and 3H-spiro[benzo[d]thiazole-2,3’-indolin]-2’-one by the
Abstract The reaction of different substituted isatins with ortho-phenylenediamine in acetic acid has been investigated. While electron-donor substituents on isatin shift the reaction toward classical 6H-indolo[2,3-b]quinoxaline ring closure, electron-withdrawing groups enhance the formation of 3-(2′-amino-5′-substituted)-quinoxaline-2(1H)-ones. The structures of all synthesized compounds were assigned