An environmentally benign attribute for the expeditious synthesis of quinoxaline and its derivatives
作者:Sangeeta Bhargava、Pooja Soni、Deepti Rathore
DOI:10.1016/j.molstruc.2019.07.005
日期:2019.12
Abstract A simple, efficient, and environmentally friendly ionic liquid mediated protocol for the synthesis of quinoxalinederivatives using carbonyl substrate and phenylenediamines has been described. A range of ionic liquids were synthesized, characterized via IR, 1H and 13C NMR and used as a solvent as well as catalyst for above protocol. The catalytic activities of ILs were evaluated and the relationship
Substituted indoloquinoxalines of the general formula I ##STR1## wherein R.sub.1 represents one of several, preferably 1 to 4, similar or different substituents in the positions 1-4 and/or 7-10, selected from halogen, prefrably Br, lower alkyl/alkoxy group having not more than 4 carbon atoms, trifluoromethyl group, trichloromethyl group; X is a group --(CH.sub.2).sub.n--R.sub.2 wherein R.sub.2 represents a nitrogen containing basic residue such as NH.sub.2, NHR.sub.4 or NR.sub.5 R.sub.6 wherein R.sub.4, R.sub.5 and R.sub.6 independently are lower alkyl or cykloalkyl and n is an integer of from 1 to 4 and R.sub.3 represents hydrogen, lower alkyl/cykloalkyl group having not more than 4 carbon atoms, and the physiologically acceptable addition products of the compounds with acids and halogen adducts, preferably adducts with iodine, iodine monochloride or iodine monobromide. Also methods for preparing said compounds by reacting a compound of the formula II ##STR2## with a reactive compound containing the residue --CHR.sub.3 R.sub.7 or by rearranging a compound the formula III by heating are described. The novel indoloquinoxalines have antiviral effect and have effect against cancer.
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%
<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
Elemental sulfur promoted condensation of indoles and 1,2-phenylenediamines
作者:Tan N. Huynh、Danh T. Tran、Tung T. Nguyen
DOI:10.1016/j.tetlet.2023.154360
日期:2023.2
limited to certain substrates. Herein we report a method for direct annulation of commercial indoles and 1,2-phenylediamines towards the synthesis of 6H-indolo[2,3-b]quinoxalines. Reactions proceeded in the presence of elemental sulfur, 4-(dimethylamino)pyridine (DMAP) base, and DMSO solvent. An array of 6H-indolo[2,3-b]quinoxalines which bearing functionalities such as unprotected phenol, pyrazole
6 H-吲哚[2,3- b ]喹喔啉的合成通常需要使用非商业起始原料,因此仅限于某些底物。在此,我们报告了一种将商用吲哚和 1,2-苯二胺直接环化以合成 6 H -吲哚[2,3- b ]喹喔啉的方法。反应在元素硫、4-(二甲基氨基)吡啶 (DMAP) 碱和 DMSO 溶剂存在下进行。以中等收率获得了一系列 6 H -吲哚并 [2,3- b ] 喹喔啉,它们具有未保护的苯酚、吡唑、氰基和仲胺等功能。