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Cycloaddition Reactions: Overview01:16

Cycloaddition Reactions: Overview

2.4K
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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[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.
8.2K
Cycloaddition Reactions: MO Requirements for Thermal Activation01:16

Cycloaddition Reactions: MO Requirements for Thermal Activation

29.8K
Thermal cycloadditions are reactions where the source of activation energy needed to initiate the reaction is provided in the form of heat. A typical example of a thermally-allowed cycloaddition is the Diels–Alder reaction, which is a [4 + 2] cycloaddition. In contrast, a [2 + 2] cycloaddition is thermally forbidden.
29.8K
Diels–Alder Reaction Forming Cyclic Products: Stereochemistry01:28

Diels–Alder Reaction Forming Cyclic Products: Stereochemistry

3.1K
The Diels–Alder reaction is one of the robust methods for synthesizing unsaturated six-membered rings. The reaction involves a concerted cyclic movement of six π electrons: four π electrons from the diene and two π electrons from the dienophile.
3.1K
Diels–Alder Reaction Forming Bridged Bicyclic Products: Stereochemistry01:29

Diels–Alder Reaction Forming Bridged Bicyclic Products: Stereochemistry

4.4K
Diels–Alder reactions between cyclic dienes locked in an s-cis configuration and dienophiles yield bridged bicyclic products.
4.4K
Cyclohexenones via Michael Addition and Aldol Condensation: The Robinson Annulation01:27

Cyclohexenones via Michael Addition and Aldol Condensation: The Robinson Annulation

2.3K
Robinson annulation is a base-catalyzed reaction for the synthesis of 2-cyclohexenone derivatives from 1,3-dicarbonyl donors (such as cyclic diketones, β-ketoesters, or β-diketones) and α,β-unsaturated carbonyl acceptors. Named after Sir Robert Robinson, who discovered it, this reaction yields a six-membered ring with three new C–C bonds (two σ bonds and one π bond).
2.3K

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Efficient Construction of Drug-like Bispirocyclic Scaffolds Via Organocatalytic Cycloadditions of α-Imino γ-Lactones and Alkylidene Pyrazolones
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Stereoselective tandem cascade furan cycloadditions.

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Summary

Oligofurans undergo stereoselective tandem cycloaddition reactions, yielding complex structures. These reactions pave the way for creating extended perylene derivatives through subsequent chemical transformations.

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Area of Science:

  • Organic Chemistry
  • Synthetic Chemistry
  • Supramolecular Chemistry

Background:

  • Oligofurans are versatile building blocks in organic synthesis.
  • Tandem cycloaddition reactions offer efficient pathways to complex molecular architectures.
  • Controlling stereoselectivity in cycloadditions is crucial for targeted synthesis.

Purpose of the Study:

  • To investigate the tandem cycloaddition reactions of oligofurans with various dienophiles.
  • To explore the stereochemical outcomes of these reactions.
  • To develop a synthetic route to extended perylene derivatives from oligofuran adducts.

Main Methods:

  • Synthesis of rigid oligofuran linkers.
  • Diels-Alder reactions with dimethyl acetylenedicarboxylate (DMAD) in a pincer mode.
  • Reactions with arynes in a domino mode.
  • Deoxygenation and aromatization of aryne adducts using HCl/EtOH.

Main Results:

  • Oligofurans linked by rigid tethers exhibit high stereoselectivity in tandem cycloaddition reactions.
  • Bisfurans react with DMAD via tandem [4 + 2]/[4 + 2] cycloadditions in a pincer fashion.
  • Oligofurans react with arynes via stereoselective tandem [4 + 2]/[4 + 2] cycloadditions in a domino manner.
  • Extended perylene derivatives were successfully synthesized from aryne adducts.

Conclusions:

  • Rigidly linked oligofurans are effective substrates for stereoselective tandem cycloaddition reactions.
  • The developed methodology provides a novel route to complex polycyclic systems.
  • This work expands the synthetic utility of oligofurans in constructing extended aromatic systems.