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Related Concept Videos

Cycloaddition Reactions: Overview01:16

Cycloaddition Reactions: Overview

2.6K
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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Cycloaddition Reactions: MO Requirements for Thermal Activation01:16

Cycloaddition Reactions: MO Requirements for Thermal Activation

3.6K
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.
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Cycloaddition Reactions: MO Requirements for Photochemical Activation01:12

Cycloaddition Reactions: MO Requirements for Photochemical Activation

2.1K
Some cycloaddition reactions are activated by heat, while others are initiated by light. For example, a [2 + 2] cycloaddition between two ethylene molecules occurs only in the presence of light. It is photochemically allowed but thermally forbidden.
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[4+2] Cycloaddition of Conjugated Dienes: Diels–Alder Reaction01:16

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

10.2K
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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Photochemical Electrocyclic Reactions: Stereochemistry01:26

Photochemical Electrocyclic Reactions: Stereochemistry

1.8K
The absorption of UV–visible light by conjugated systems causes the promotion of an electron from the ground state to the excited state. Consequently, photochemical electrocyclic reactions proceed via the excited-state HOMO rather than the ground-state HOMO. Since the ground- and excited-state HOMOs have different symmetries, the stereochemical outcome of electrocyclic reactions depends on the mode of activation; i.e., thermal or photochemical.
Selection Rules: Photochemical Activation
1.8K
Thermal and Photochemical Electrocyclic Reactions: Overview01:26

Thermal and Photochemical Electrocyclic Reactions: Overview

2.3K
Electrocyclic reactions are reversible reactions. They involve an intramolecular cyclization or ring-opening of a conjugated polyene. Shown below are two examples of electrocyclic reactions. In the first reaction, the formation of the cyclic product is favored. In contrast, in the second reaction, ring-opening is favored due to the high ring strain associated with cyclobutene formation.
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Cercosporin-Photocatalyzed [4+1]- and [4+2]-Annulations of Azoalkenes Under Mild Conditions
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Double Strain-Release [2π+2σ]-Photocycloaddition.

Subhabrata Dutta1, Yi-Lin Lu2, Johannes E Erchinger1

  • 1Organisch-Chemisches Institut, Universität Münster, Corrensstraße 36, 48149 Münster, Germany.

Journal of the American Chemical Society
|February 13, 2024
PubMed
Summary
This summary is machine-generated.

This study introduces a novel double strain-release driven photocycloaddition reaction. It efficiently synthesizes diverse heterobicyclo[2.1.1]hexane units, valuable pharmaceutical building blocks.

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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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Area of Science:

  • Organic Chemistry
  • Medicinal Chemistry
  • Photochemistry

Background:

  • Small ring systems offer unique reactivity due to inherent strain.
  • Strained precursors like cyclobutenone can generate reactive intermediates such as ketene.
  • Bicyclo[1.1.0]butane (BCB) is a strained cyclic compound with potential for novel reactions.

Purpose of the Study:

  • To develop a novel synthetic route to heterobicyclo[2.1.1]hexane scaffolds.
  • To explore the utility of a double strain-release driven photocycloaddition reaction.
  • To synthesize pharmaceutically relevant bioisosteres using strained ring systems.

Main Methods:

  • Photocycloaddition reaction between cyclobutenone and bicyclo[1.1.0]butane (BCB).
  • Utilizing transient ketene generated from cyclobutenone.
  • Employing catalyst-free conditions.
  • Conducting experimental mechanistic studies and Density Functional Theory (DFT) calculations.

Main Results:

  • Successful synthesis of diverse heterobicyclo[2.1.1]hexane units.
  • Demonstration of a double strain-release driven [2π+2σ]-photocycloaddition.
  • High functional group tolerance observed in the reaction.
  • Identification of a triplet mechanism for the photocycloaddition.

Conclusions:

  • The developed photocycloaddition is an effective method for synthesizing valuable heterobicyclo[2.1.1]hexane structures.
  • The reaction proceeds efficiently under catalyst-free conditions, highlighting its synthetic utility.
  • The findings provide insights into strain-release driven reactions and their application in medicinal chemistry.