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Related Concept Videos

Aryldiazonium Salts to Azo Dyes: Diazo Coupling01:11

Aryldiazonium Salts to Azo Dyes: Diazo Coupling

The reaction of weakly electrophilic aryldiazonium (also called arenediazonium) salts with highly activated aromatic compounds leads to the formation of products with an —N=N— link, called an azo linkage. This reaction, presented in Figure 1, is known as diazo coupling and occurs without the loss of the nitrogen atoms of the aryldiazonium salt. Highly activated aromatic compounds such as phenols or arylamines favor the diazo coupling reaction. The coupling generally occurs at the para position.
Aromatic Hydrocarbon Cations: Structural Overview01:18

Aromatic Hydrocarbon Cations: Structural Overview

Cycloheptatriene is a neutral monocyclic unsaturated hydrocarbon that consists of an odd number of carbon atoms and an intervening sp3 carbon in the ring. The three double bonds in the ring correspond to 6 π electrons, which is a Huckel number, and therefore satisfies the criteria of 4n + 2 π electrons. However, the intervening sp3 carbon disrupts the continuous overlap of p orbitals. As a result, cycloheptatriene is not aromatic.
Removing one hydrogen from the intervening CH2 group with both...
Anthelminthic Agents01:15

Anthelminthic Agents

Anthelmintic drugs differ significantly from antiparasitic therapies targeting protozoa, primarily due to differences in parasite biology. Whereas most protozoal treatments act on proliferating cells, anthelmintics are typically directed against mature, nonproliferative helminths. The therapeutic approach considers the helminth's reliance on neuromuscular coordination, glucose metabolism, and microtubular integrity for survival, reproduction, and localization within the host. Most anthelmintics...
Diazonium Group Substitution with Halogens and Cyanide: Sandmeyer and Schiemann Reactions01:20

Diazonium Group Substitution with Halogens and Cyanide: Sandmeyer and Schiemann Reactions

Arenediazonium substitution reactions occur when the diazonium group is substituted by various functional groups such as halides, hydroxyl, nitrile, etc. For instance, arenediazonium salts react with copper(I) salts of chloride, bromide, or cyanide to form corresponding aryl chlorides, bromides, and nitriles. These reactions are named Sandmeyer reactions. Although the mechanism of this reaction is complicated, as illustrated in Figure 1, they are believed to progress via an aryl copper...
Diazonium Group Substitution: –OH and –H01:19

Diazonium Group Substitution: –OH and –H

Nitrous acid, a weak acid, is prepared in situ via the reaction of sodium nitrite with a strong acid under cold conditions. This nitrous acid prepared in situ reacts with primary arylamines to form arenediazonium salts. Such reactions are known as diazotization reactions. As shown in Figure 1, the formation of arenediazonium salts begins with the decomposition of nitrous acid in an acidic solution to give nitrosonium ions.
Directing and Steric Effects in Disubstituted Benzene Derivatives01:18

Directing and Steric Effects in Disubstituted Benzene Derivatives

When disubstituted benzenes undergo electrophilic substitution, the product distribution depends on the directing effect of both substituents. When the directing effects of both substituents reinforce each other, a single product is obtained. For example, bromination of p-nitrotoluene occurs ortho to the methyl group and meta to the nitro group, which is the same position, resulting in a single product. However, if the directing effects of the two groups oppose each other, the more strongly...

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Related Experiment Video

Updated: Jun 20, 2026

Cercosporin-Photocatalyzed [4+1]- and [4+2]-Annulations of Azoalkenes Under Mild Conditions
07:12

Cercosporin-Photocatalyzed [4+1]- and [4+2]-Annulations of Azoalkenes Under Mild Conditions

Published on: July 17, 2020

Benzo[e][1,2,4]triazolo[1,5-c][1,2,3]triazines: Design, Synthesis, and Cytotoxic Effects.

Serhii Sinyavskyi1, Svitlana Koptieva1, Oleksii Voskoboinik2

  • 1Institute of Chemistry and Geology, Oles Honchar Dnipro National University, Dnipro, Ukraine.

Chemistry & Biodiversity
|June 19, 2026
PubMed
Summary

Researchers developed a strategy using conformational restriction to identify new anticancer drugs. They found that benzo[e][1,2,4]triazolo[1,5-c][1,2,3]triazines show selective activity against Jurkat cancer cells.

Keywords:
MTT‐testSwissADME аnalysisbenzo[e][1,2,4]triazolo[1,5‐c][1,2,3]triazinescytotoxic actionmolecular dockingspectral datasynthesisx‐ray

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Functionalized Spirocyclic Heterocycle Synthesis and Cytotoxicity Assay
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Functionalized Spirocyclic Heterocycle Synthesis and Cytotoxicity Assay

Published on: February 9, 2021

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Last Updated: Jun 20, 2026

Cercosporin-Photocatalyzed [4+1]- and [4+2]-Annulations of Azoalkenes Under Mild Conditions
07:12

Cercosporin-Photocatalyzed [4+1]- and [4+2]-Annulations of Azoalkenes Under Mild Conditions

Published on: July 17, 2020

Functionalized Spirocyclic Heterocycle Synthesis and Cytotoxicity Assay
05:17

Functionalized Spirocyclic Heterocycle Synthesis and Cytotoxicity Assay

Published on: February 9, 2021

Area of Science:

  • Medicinal Chemistry
  • Organic Synthesis
  • Pharmacology

Background:

  • Developing novel anticancer agents is crucial for combating cancer.
  • Benzo[e][1,2,4]triazolo[1,5-c][1,2,3]triazines are a class of compounds with potential biological activity.
  • Conformational restriction is a strategy used to enhance the binding affinity and selectivity of drug candidates.

Purpose of the Study:

  • To develop a strategy for identifying biologically active compounds within the benzo[e][1,2,4]triazolo[1,5-c][1,2,3]triazine scaffold.
  • To synthesize and characterize novel benzo[e][1,2,4]triazolo[1,5-c][1,2,3]triazine derivatives.
  • To evaluate the cytotoxic and antiproliferative activity of these compounds against various cancer cell lines.

Main Methods:

  • Synthesis of target compounds via diazotization and cyclization of ([2-(3-R-1H-[1,2,4]triazol-5-yl)phenyl]amines.
  • Structural elucidation using IR, LC-MS, NMR spectroscopy, and X-ray crystallography.
  • In vitro cytotoxicity screening against a panel of tumor and pseudo-normal cell lines.

Main Results:

  • The synthesized benzo[e][1,2,4]triazolo[1,5-c][1,2,3]triazines exhibited selective antiproliferative activity against Jurkat cells.
  • The IC50 values ranged from 7.64 to >100 µM.
  • Compound 2e, 2-(naphthaline-1-ylmethyl)benzo[e][1,2,4]triazolo[1,5-c][1,2,3]triazine, showed potent activity with an IC50 of 7.64 µM.

Conclusions:

  • Conformational restriction is a promising strategy for discovering biologically active compounds.
  • The identified benzo[e][1,2,4]triazolo[1,5-c][1,2,3]triazines demonstrate potential as anticancer agents.
  • Further structural modifications may lead to more effective antitumor therapies.