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Related Concept Videos

Phase II Conjugation Reactions: Overview01:14

Phase II Conjugation Reactions: Overview

Conjugation, a key component of phase II biotransformation reactions, is a vital process in drug detoxification. It involves transferring endogenous substances like glucuronic acid, sulfate, and glycine to drugs or their metabolites formed in phase I reactions. These conjugation reactions, often catalyzed by specific enzymes, transform potentially harmful metabolites into inactive, water-soluble forms easily excreted in urine or bile. By enhancing polarity and eliminating pharmacological...
Aromatic Compounds: Overview01:25

Aromatic Compounds: Overview

In general, the term ‘aromatic’ indicates a pleasant smell or fragrance from fresh flowers, freshly prepared coffee, etc. In the early history of organic chemistry, many benzene derivatives were isolated from the pleasant odor oils of the plants. For example, vanillin was isolated from the oil of vanilla, methyl salicylate from the oil of wintergreen, and cinnamaldehyde from the oil of cinnamon. They all had a pleasant odor; hence the name aromatic was given.
In 1825, Faraday isolated benzene...
Aromatic Hydrocarbon Anions: Structural Overview01:18

Aromatic Hydrocarbon Anions: Structural Overview

Neutral hydrocarbons like cyclopentadiene with an odd number of carbon atoms and one intervening CH2 group in the ring are not aromatic. Cyclopentadiene with 4 π electrons does not satisfy the 4n + 2 π electron rule. Additionally, the intervening CH2 group is sp3 hybridized and lacks a vacant p orbital, thereby interrupting the overlap of p orbitals in a continuous manner and preventing the delocalization of π electrons throughout the ring.
Due to the absence of continuous overlap of p...
Phase II Reactions: Miscellaneous Conjugation Reactions01:19

Phase II Reactions: Miscellaneous Conjugation Reactions

Phase II biotransformations are detoxification mechanisms that conjugate xenobiotics with endogenous substances, neutralizing their toxicity.
A key example involves the conjugation of cyanide ions, which impair cellular respiration and alter hemoglobin into non-oxygen-carrying cyanmethemoglobin. To neutralize this threat, a sulfur atom from thiosulphate is transferred to the cyanide ion, catalyzed by the enzyme rhodanese, resulting in an inactive compound called thiocyanate. The production of...
Five-Membered Heterocyclic Aromatic Compounds: Overview01:13

Five-Membered Heterocyclic Aromatic Compounds: Overview

Heterocyclic aromatic compounds are cyclic compounds that are aromatic and have one or more heteroatoms—atoms other than carbon, in the ring. Depending upon the number of atoms present in the ring, they can be either five or six-membered. Examples of five-membered heterocyclic aromatic compounds include pyrrole, furan, thiophene, and imidazole. Pyrrole consists of one nitrogen atom having one lone pair of electrons. Furan and thiophene have one oxygen and one sulfur heteroatom, respectively.
Conjugate Addition to α,β-Unsaturated Carbonyl Compounds01:09

Conjugate Addition to α,β-Unsaturated Carbonyl Compounds

α,β-Unsaturated carbonyl compounds are molecules bearing a carbonyl and alkene functionality in conjugation with each other. The conjugation in the molecule leads to three resonance structures. The hybrid form exhibits two probable electrophilic sites: the carbonyl carbon and the β carbon.

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Homogeneous Glycoconjugate Produced by Combined Unnatural Amino Acid Incorporation and Click-Chemistry for Vaccine Purposes
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Multivalent glycoconjugate syntheses and applications using aromatic scaffolds.

Yoann M Chabre1, René Roy

  • 1Pharmaqam - Department of Chemistry, Université du Québec à Montréal, P.O. Box 8888, Succ. Centre-ville, Montréal, Québec, Canada H3C 3P8.

Chemical Society Reviews
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Summary

Chemists use dendrimer chemistry to create multivalent glycoconjugates, which are essential for understanding glycan-protein interactions in diseases. These synthetic tools help decipher biological "glycocodes" for targeted therapies.

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Area of Science:

  • Carbohydrate Chemistry
  • Supramolecular Chemistry
  • Glycoscience

Background:

  • Glycan-protein interactions are crucial in biological processes and disease.
  • The spatial arrangement of sugars, known as "glycocodes," dictates specific recognition events.
  • Understanding these interactions is key to developing new therapeutic strategies.

Purpose of the Study:

  • To review synthetic strategies for creating multivalent glycoconjugates using dendritic architectures.
  • To explore the synthesis and properties of various aromatic scaffolds for carbohydrate presentation.
  • To highlight the biological and medical applications of these glycoarchitectures.

Main Methods:

  • Dendrimer chemistry for synthesizing monodisperse multivalent glycoconjugates.
  • Covalent attachment and supramolecular self-assembly for carbohydrate presentation.
  • Organometallic methodologies for controlled synthesis of aromatic scaffolds.

Main Results:

  • Development of diverse aromatic scaffolds for multivalent display of carbohydrates.
  • Characterization of the biophysical and biological properties of resulting glycoarchitectures.
  • Demonstration of the ability of these structures to form organized lattices with lectins.

Conclusions:

  • Synthetic glycoarchitectures, including glycoclusters and glycodendrimers, offer precise control over carbohydrate presentation.
  • These advanced materials hold significant potential for medical imaging, diagnostics, and therapeutics.
  • The review covers a range of scaffolds, from simple aromatic systems to complex nanostructures like fullerenes.