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Related Concept Videos

[4+2] Cycloaddition of Conjugated Dienes: Diels–Alder Reaction01:16

[4+2] Cycloaddition of Conjugated Dienes: Diels–Alder Reaction

The Diels–Alder reaction is an example of a thermal pericyclic reaction between a conjugated diene and an alkene or alkyne, commonly referred to as a dienophile. The reaction involves a concerted movement of six π electrons, four from the diene and two from the dienophile, forming an unsaturated six-membered ring. As a result, these reactions are classified as [4+2] cycloadditions.
Vicinal Diols via Reductive Coupling of Aldehydes or Ketones: Pinacol Coupling Overview01:27

Vicinal Diols via Reductive Coupling of Aldehydes or Ketones: Pinacol Coupling Overview

Wilhelm Rudolph Fittig discovered the pinacol coupling reaction in 1859. It is a radical dimerization reaction and involves the reductive coupling of aldehydes or ketones in the presence of hydrocarbon solvent to yield vicinal diols.
Spin–Spin Coupling: Two-Bond Coupling (Geminal Coupling)01:20

Spin–Spin Coupling: Two-Bond Coupling (Geminal Coupling)

Two NMR-active nuclei bonded to a central atom can be involved in geminal or two-bond coupling. Geminal coupling is commonly seen between diastereotopic protons in chiral molecules and unsymmetrical alkenes, among others.
The central atom need not be NMR-active because its electrons are affected by the electron polarization of the spin-active atoms. However, spin information is transmitted less effectively than in one-bond coupling, and 2J values are usually weaker than 1J values. The energy of...
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.
Diels–Alder Reaction: Characteristics of Dienes01:29

Diels–Alder Reaction: Characteristics of Dienes

The Diels–Alder reaction brings together a diene and a dienophile to form a six-membered ring. Both components have unique characteristics that influence the rate of the reaction.
Characteristics of the diene
Conformation
The simplest example of a diene is 1,3-butadiene, an acyclic conjugated π system. At room temperature, the molecule exists as a mixture of s-cis and s-trans conformers by virtue of rotation around the carbon–carbon single bond. Although the s-trans isomer is more stable, the...
Diels–Alder Reaction: Characteristics of Dienophiles01:24

Diels–Alder Reaction: Characteristics of Dienophiles

In a Diels–Alder reaction, the diene is usually an electron-rich system and acts as a nucleophile, whereas the dienophile is electron-deficient and functions as an electrophile. Much like the diene, the nature of the dienophile significantly impacts the outcome of the reaction.
Characteristics of Dienophiles
Generally, the best dienophiles are alkenes containing electron-withdrawing substituents such as carbonyl, nitrile, and nitro groups. The feasibility of a Diels–Alder reaction depends on...

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Sequence-specific and Selective Recognition of Double-stranded RNAs over Single-stranded RNAs by Chemically Modified Peptide Nucleic Acids
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Diamination by N-coupling using a commercial laccase.

Kevin W Wellington1, Paul Steenkamp, Dean Brady

  • 1CSIR Biosciences, Modderfontein 1645, South Africa. kwellington@csir.co.za

Bioorganic & Medicinal Chemistry
|February 4, 2010
PubMed
Summary

Researchers used immobilised laccase to diaminate p-hydroquinones with amines, creating diaminated p-benzoquinones. These compounds show potential for various medicinal applications.

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Area of Science:

  • Biocatalysis
  • Organic Synthesis
  • Medicinal Chemistry

Background:

  • Enzyme catalysis offers sustainable routes for chemical synthesis.
  • Laccases are versatile oxidoreductases with broad substrate scope.
  • Developing efficient methods for synthesizing bioactive molecules is crucial.

Purpose of the Study:

  • To investigate the nuclear diamination of p-hydroquinones using immobilised laccase.
  • To explore the synthesis of diaminated p-benzoquinones from aromatic and aliphatic primary amines.
  • To evaluate the potential biological activities of the synthesized compounds.

Main Methods:

  • Utilisation of immobilised commercial laccase (Denilite II Base).
  • Reaction of p-hydroquinones with primary amines under mild conditions (room temperature to 35°C).
  • Employing a co-solvent in an open-air reaction vessel.

Main Results:

  • Exclusive formation of diaminated p-benzoquinones.
  • Successful diamination using both aromatic and aliphatic amines.
  • Mild reaction conditions achieved with biocatalysis.

Conclusions:

  • Immobilised laccase is an effective catalyst for nuclear diamination.
  • The synthesized diaminated p-benzoquinones possess potential therapeutic properties.
  • This method provides a green and efficient route to novel bioactive compounds.