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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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[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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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.
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Oxidation of Alkenes: Anti Dihydroxylation with Peroxy Acids02:04

Oxidation of Alkenes: Anti Dihydroxylation with Peroxy Acids

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Diols are compounds with two hydroxyl groups. In addition to syn dihydroxylation, diols can also be synthesized through the process of anti dihydroxylation. The process involves treating an alkene with a peroxycarboxylic acid to form an epoxide. Epoxides are highly strained three-membered rings with oxygen and two carbons occupying the corners of an equilateral triangle. This step is followed by ring-opening of the epoxide in the presence of an aqueous acid to give a trans diol.
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Thermal and Photochemical Electrocyclic Reactions: Overview01:26

Thermal and Photochemical Electrocyclic Reactions: Overview

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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.
2.5K
Thermal Electrocyclic Reactions: Stereochemistry01:17

Thermal Electrocyclic Reactions: Stereochemistry

2.1K
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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Divergent oxidative dearomatization coupling reactions to construct polycyclic cyclohexadienones.

Qian Pu1, Mingming Huo1, Guojuan Liang1

  • 1Chongqing Research Center for Pharmaceutical Engineering, College of Pharmacy, Chongqing Medical University, Chongqing 400016, China. hzhou@cqmu.edu.cn.

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This study introduces novel copper- and palladium-catalyzed oxidative dearomatization coupling reactions. These methods efficiently produce diverse polycyclic cyclohexadienones from phenolic derivatives with high yields.

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Area of Science:

  • Organic Chemistry
  • Catalysis
  • Synthetic Methodology

Background:

  • Oxidative dearomatization reactions are crucial for synthesizing complex organic molecules.
  • Controlling chemoselectivity in dearomatization remains a significant challenge in synthetic chemistry.
  • Phenolic derivatives are versatile starting materials for various chemical transformations.

Purpose of the Study:

  • To develop highly selective divergent oxidative dearomatization coupling reactions.
  • To control chemoselectivity using catalysts and bases.
  • To synthesize diverse polycyclic cyclohexadienones from readily available phenolic precursors.

Main Methods:

  • Utilized copper and palladium catalysts for C-H oxidative dearomatization.
  • Employed specific bases to control reaction chemoselectivity.
  • Investigated the reaction scope with various phenolic derivatives.

Main Results:

  • Achieved highly selective divergent oxidative dearomatization coupling reactions.
  • Successfully synthesized three distinct types of polycyclic cyclohexadienones.
  • Obtained products in high yields (85-99%) for 41 examples.
  • Demonstrated the novel application of copper and palladium catalysis in this transformation.

Conclusions:

  • Developed a novel and efficient method for the synthesis of polycyclic cyclohexadienones.
  • Established a catalyst- and base-controlled approach for divergent dearomatization.
  • The reported methodology offers a valuable tool for accessing complex molecular architectures from phenolic compounds.