The present work describes the applications of Brönsted acid hydrotrope combined catalyst (BAHC) as a mild, efficient and reusable catalyst for synthesis of indoloquinoxalines and bis-tetronic acids in water. Using BAHC, we synthesized many indoloquinoxaline derivatives from isatins and o-phenylene diamine using 10 mol% PTSA in 40% aqueous hydrotropic (NaPTS) solution at room temperature with 83–90%
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
Sulfamic Acid: A Mild, Efficient, and Cost-Effective Catalyst for Synthesis of Indoloquinoxalines at Ambient Temperature
作者:Pravin G. Hegade、Mansing M. Mane、Jayavant D. Patil、Dattaprasad M. Pore
DOI:10.1080/00397911.2014.943345
日期:2014.12.2
A simple, cost-effective method for synthesis of indoloquinoxalines from isatin and o-phenylenediamine employing a catalytic amount of sulfamic acid at ambient temperature is reported. Moreover, the method is applicable for a variety of isatins, ninhydrin, 4-hydroxynaphthaquinone, and 1,2-diketones. The key features of the protocol include rapid reactions with good yields, simple workup procedure, and easy isolation of products.
Synthesis of New 2-(6H-Indolo[2,3-b]quinoxalin-6-yl)-1-phenylethane-1-ones
作者:V. E. Melnichenko、T. N. Kudryavtseva、E. V. Grekhneva、A. Y. Lamanov、T. A. Kudryavcev
DOI:10.1134/s1070363221100212
日期:2021.10
Halberkann, Chemische Berichte, 1921, vol. 54, p. 3096