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Related Concept Videos

Cycloaddition Reactions: Overview01:16

Cycloaddition Reactions: Overview

2.8K
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.
10.7K
Cycloaddition Reactions: MO Requirements for Thermal Activation01:16

Cycloaddition Reactions: MO Requirements for Thermal Activation

3.7K
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.
3.7K
Diels–Alder Reaction Forming Bridged Bicyclic Products: Stereochemistry01:29

Diels–Alder Reaction Forming Bridged Bicyclic Products: Stereochemistry

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Diels–Alder reactions between cyclic dienes locked in an s-cis configuration and dienophiles yield bridged bicyclic products.
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Diels–Alder Reaction Forming Cyclic Products: Stereochemistry01:28

Diels–Alder Reaction Forming Cyclic Products: Stereochemistry

4.1K
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.
4.1K
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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Updated: Sep 13, 2025

Efficient Construction of Drug-like Bispirocyclic Scaffolds Via Organocatalytic Cycloadditions of &#945;-Imino &#947;-Lactones and Alkylidene Pyrazolones
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Dearomatization [4+2] cycloaddition for constructing bridged polycyclic lactams.

Qile Wu1, Jingyi Chen1, Haoxian Wu1

  • 1School of Environmental and Chemical Engineering, Wuyi University, Jiangmen 529020, China. chenxiuwen2010@126.com.

Chemical Communications (Cambridge, England)
|July 29, 2025
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Summary
This summary is machine-generated.

This study introduces a metal-free catalytic system for synthesizing complex polycyclic lactams from isoquinoline and maleimide derivatives in a single step. This efficient dearomatization strategy avoids transition metals and achieves high selectivity.

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Area of Science:

  • Organic Chemistry
  • Catalysis
  • Synthetic Methodology

Background:

  • Metal-free catalysis is crucial for sustainable synthesis.
  • Developing efficient routes to complex polycyclic lactams remains a challenge.
  • Isoquinoline derivatives are valuable scaffolds in medicinal chemistry.

Purpose of the Study:

  • To develop a novel metal-free catalytic system for [4+2] cycloaddition reactions.
  • To enable the one-step synthesis of structurally complex bridged polycyclic lactams.
  • To achieve functionalization of 3-halogenated isoquinolines via dearomatization.

Main Methods:

  • A three-component tandem cyclization reaction involving isoquinoline and maleimide derivatives.
  • Utilizing a metal-free catalytic system.
  • Employing a dearomatization strategy.

Main Results:

  • Successful one-step construction of bridged polycyclic lactams.
  • Formation of C-N, C-O, and C-C bonds.
  • Achieved functionalization at C1, N2, C3, and C4 positions of 3-halogenated isoquinolines.
  • Demonstrated exceptional chemoselectivity and regioselectivity.
  • High atom and step economy.

Conclusions:

  • The developed metal-free system provides an efficient route to complex polycyclic lactams.
  • This dearomatization strategy offers a sustainable and selective approach for organic synthesis.
  • The methodology allows for versatile functionalization of isoquinoline scaffolds.