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Relevant academic research and scientific papers

Br?nsted acid hydrotrope combined catalysis in water: a green approach for the synthesis of indoloquinoxalines and bis-tetronic acids

The present work describes the applications of Br?nsted 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 indoloquinoxal

6H-indolo[2,3-b]quinoxaline derivative, and preparation method and application thereof

The invention provides a 6H-indolo[2,3-b]quinoxaline derivative, and a preparation method and application thereof. The general formula is as shown in the specification. The preparation method comprises a step of preparing the 6H-indolo[2,3-b]quinoxaline derivative by taking o-phenylenediamine, indoldione, dihaloalkane and amine compounds as raw materials. The compounds provided by the invention show good antitumor activity.

An environmentally benign attribute for the expeditious synthesis of quinoxaline and its derivatives

A simple, efficient, and environmentally friendly ionic liquid mediated protocol for the synthesis of quinoxaline derivatives 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 between the catalytic activity and acidity was discussed. It was also found that among the all ILs, [Bmim]CF3SO3 was the most effective, eco-friendly and less expensive solvent and catalyst for the above etiquette. This method is of significant value due to the eco-friendly nature of ionic liquid and non usage of separate catalyst to drive the reaction forward. The protocol proves to be efficient and environmentally benign in terms of good to excellent yields, low reaction times, simple work-up, ease of recovery, and reusability of ionic liquid for six times.

Virtual screening, synthesis and biological evaluation of DNA intercalating antiviral agents

This paper describes computer-aided design of new anti-viral agents against Vaccinia virus (VACV) potentially acting as nucleic acid intercalators. Earlier obtained experimental data for DNA intercalation affinities and activities against Vesicular stomatitis virus (VSV) have been used to build, respectively, pharmacophore and QSAR models. These models were used for virtual screening of a database of 245 molecules generated around typical scaffolds of known DNA intercalators. This resulted in 12 hits which then were synthesized and tested for antiviral activity against VaV together with 43 compounds earlier studied against VSV. Two compounds displaying high antiviral activity against VaV and low cytotoxicity were selected for further antiviral activity investigations.

Sulfamic acid: A mild, efficient, and cost-effective catalyst for synthesis of indoloquinoxalines at ambient temperature

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.

Cu doped CdS nanoparticles: A versatile and recoverable catalyst for chemoselective synthesis of indolo[2,3-b]quinoxaline derivatives under microwave irradiation

CdS and Cu doped CdS NPs has been obtained successfully using safe agents through a simple aqueous chemical method and characterized by XRD, TEM, SEM, EDAX, UV/VIS and ICP-AES. These investigations revealed that the particle size of the synthesized materi

Impact of substituents on the isatin ring on the reaction between isatins with ortho-phenylenediamine

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

Substituted indoloquinoxalines

Substituted indoloquinoxalines of the general formula I STR1 wherein R1 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 --(CH2)n--R2 wherein R2 represents a nitrogen containing basic residue such as NH2, NHR4 or NR5 R6 wherein R4, R5 and R6 independently are lower alkyl or cykloalkyl and n is an integer of from 1 to 4 and R3 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 --CHR3 R7 or by rearranging a compound the formula III by heating are described. The novel indoloquinoxalines have antiviral effect and have effect against cancer.