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Cycloaddition Reactions: Overview01:16

Cycloaddition Reactions: Overview

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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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Alkenes via Reductive Coupling of Aldehydes or Ketones: McMurry Reaction01:22

Alkenes via Reductive Coupling of Aldehydes or Ketones: McMurry Reaction

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The radical dimerization of ketones or aldehydes gives vicinal diols through a pinacol coupling reaction. However, the behavior of titanium metals used for the reaction as a source of electrons is unusual. When the reaction is carried out in the presence of titanium, diols can be isolated at low temperatures. Else titanium further reacts with diols, forming alkenes through the McMurry reaction.
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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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Cycloaddition Reactions: MO Requirements for Thermal Activation01:16

Cycloaddition Reactions: MO Requirements for Thermal Activation

29.7K
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.
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Diels–Alder Reaction Forming Cyclic Products: Stereochemistry01:28

Diels–Alder Reaction Forming Cyclic Products: Stereochemistry

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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
Thermal Electrocyclic Reactions: Stereochemistry01:17

Thermal Electrocyclic Reactions: Stereochemistry

1.6K
The stereochemistry of electrocyclic reactions is strongly influenced by the orbital symmetry of the polyene HOMO. Under thermal conditions, the reaction proceeds via the ground-state HOMO.
Selection Rules: Thermal Activation
Conjugated systems containing an even number of π-electron pairs undergo a conrotatory ring closure. For example, thermal electrocyclization of (2E,4E)-2,4-hexadiene, a conjugated diene containing two π-electron pairs, gives trans-3,4-dimethylcyclobutene.
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Multicomponent-multicatalyst reactions (MC)(2)R: efficient dibenzazepine synthesis.

Jennifer Tsoung1, Jane Panteleev, Matthias Tesch

  • 1Department of Chemistry, University of Toronto , 80 St George Street, Toronto, Ontario, Canada , M5S 3H6.

Organic Letters
|December 17, 2013
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Summary

A novel Rh(I)/Pd(0) catalyst enables efficient synthesis of aza-dibenzazepines using vinylpyridines, arylboronic acids, and amines in a single domino reaction.

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Area of Science:

  • Organic Chemistry
  • Catalysis
  • Synthetic Methodology

Background:

  • Aza-dibenzazepines are important heterocyclic compounds with diverse biological activities.
  • Efficient synthetic routes for constructing these complex molecules are highly sought after.

Purpose of the Study:

  • To develop a novel multicomponent reaction for the synthesis of aza-dibenzazepines.
  • To utilize a synergistic Rh(I)/Pd(0) catalytic system for a domino process.

Main Methods:

  • A one-pot, three-component reaction involving vinylpyridines, arylboronic acids, and amines.
  • Employing a Rh(I)/Pd(0) bimetallic catalyst system.
  • No intermediate isolation or purification steps were required.

Main Results:

  • Successful synthesis of aza-dibenzazepines through a domino process.
  • The Rh(I)/Pd(0) catalyst system demonstrated high efficiency and selectivity.
  • The reaction proceeded without the need for isolating or purifying intermediates.

Conclusions:

  • A new, efficient domino reaction for aza-dibenzazepine synthesis has been established.
  • The developed method offers a streamlined approach using readily available starting materials.
  • This catalytic system provides a valuable tool for accessing complex heterocyclic scaffolds.