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

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

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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.
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Olefin Metathesis Polymerization: Acyclic Diene Metathesis (ADMET)00:53

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Acyclic diene metathesis polymerization or ADMET polymerization involves cross-metathesis of terminal dienes, such as 1,8-nonadiene, to give linear unsaturated polymer and ethylene. As ADMET is a reversible process, the formed ethylene gas must be removed from the reaction mixture to complete the polymerization process.
Similar to cross-metathesis, ADMET also involves the formation of metallacyclobutane intermediate by [2+2] cycloaddition of one of the double bonds of a terminal diene with...
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Regioselectivity and Stereochemistry of Acid-Catalyzed Hydration02:34

Regioselectivity and Stereochemistry of Acid-Catalyzed Hydration

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The rate of acid-catalyzed hydration of alkenes depends on the alkene's structure, as the presence of alkyl substituents at the double bond can significantly influence the rate.
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Synthesis and Decomposition Reactions

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Synthesis and decomposition are two types of redox reactions. Synthesis means to make something, whereas decomposition means to break something. The reactions are accompanied by chemical and energy changes. 
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Cycloaddition Reactions: Overview01:16

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Cycloadditions are one of the most valuable and effective synthesis routes to form cyclic compounds. These are concerted pericyclic reactions between two unsaturated compounds resulting in a cyclic product with two new σ bonds formed at the expense of π bonds. The [4 + 2] cycloaddition, known as the Diels–Alder reaction, is the most common. The other example is a [2 + 2] cycloaddition.
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Diels–Alder Reaction: Characteristics of Dienes01:29

Diels–Alder Reaction: Characteristics of Dienes

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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...
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Diversity oriented combinatorial synthesis of multivalent glycomimetics through a multicomponent domino process.

Maria Cristina Bellucci1, Monica Sani, Aurora Sganappa

  • 1Department of Food, Environmental and Nutritional Sciences, Università degli Studi di Milano , via Celoria 2, 20133 Milano, Italy.

ACS Combinatorial Science
|October 21, 2014
PubMed
Summary

This study introduces a new method for creating diverse multivalent glycomimetics using multicomponent domino reactions. This approach enables the synthesis of novel compounds for studying glycoside inhibition and creating aminoglycoside conjugates.

Keywords:
combinatorial chemistrydiversity oriented synthesisdomino reactionmulticomponent reactionmultivalent glycomimetics

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Area of Science:

  • Medicinal Chemistry
  • Organic Synthesis
  • Carbohydrate Chemistry

Background:

  • Multicomponent reactions and diversity-oriented synthesis are vital in medicinal chemistry.
  • The synthesis of multivalent glycomimetics for glycoside inhibition remains underexplored.
  • Glycomimetics are crucial for understanding carbohydrate interactions and developing therapeutics.

Purpose of the Study:

  • To develop a combinatorial synthesis strategy for diversity-oriented hetero di- and trivalent glycomimetics.
  • To explore the utility of multicomponent domino reactions in glycomimetic synthesis.
  • To enable the creation of novel glycomimetics for glycoside inhibition studies and drug conjugate development.

Main Methods:

  • Utilized a multicomponent domino process for synthesizing glycomimetics.
  • Employed easily accessible sugar starting materials like glycosylamines, glycosylazides, and glycosylisothiocyanates.
  • Investigated tethering functional groups to the anomeric carbon or the primary 6/5 position of hexoses/pentoses.

Main Results:

  • Achieved high-yielding and general synthesis of diverse glycomimetics.
  • Generated glycomimetics with artificial, enzymatically stable backbones.
  • Successfully synthesized aminoglycoside (neomycin) conjugates via the developed multicomponent strategy.

Conclusions:

  • The reported multicomponent domino process is a versatile and efficient method for synthesizing multivalent glycomimetics.
  • This approach expands the toolkit for medicinal chemists in exploring multivalency and developing novel carbohydrate-based therapeutics.
  • The methodology facilitates the creation of complex glycomimetic structures, including aminoglycoside conjugates, with potential therapeutic applications.