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Cycloaddition Reactions: Overview01:16

Cycloaddition Reactions: Overview

2.7K
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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Pericyclic Reactions: Introduction01:17

Pericyclic Reactions: Introduction

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Pericyclic reactions are organic reactions that occur via a concerted mechanism without generating any intermediates. The reactions proceed through the movement of electrons in a closed loop to form a cyclic transition state, where rearrangement of the σ and π bonds yields specific products.
Pericyclic reactions can be classified into three categories: electrocyclic reactions, cycloaddition reactions, and sigmatropic rearrangements. Electrocyclic reactions and sigmatropic...
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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.
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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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Five-Membered Heterocyclic Aromatic Compounds: Overview01:13

Five-Membered Heterocyclic Aromatic Compounds: Overview

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Heterocyclic aromatic compounds are cyclic compounds that are aromatic and have one or more heteroatoms—atoms other than carbon, in the ring. Depending upon the number of atoms present in the ring, they can be either five or six-membered. Examples of five-membered heterocyclic aromatic compounds include pyrrole, furan, thiophene, and imidazole. Pyrrole consists of one nitrogen atom having one lone pair of electrons. Furan and thiophene have one oxygen and one sulfur heteroatom,...
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Bioactive 2-pyridone-containing heterocycle syntheses using multicomponent reactions.

Diana Hurtado-Rodríguez1, Angélica Salinas-Torres1, Hugo Rojas1

  • 1Grupo de Catálisis de la UPTC, Escuela de Ciencias Química, Universidad Pedagógica y Tecnológica de Colombia Avenida Central del Norte 39-115 Tunja Colombia diana.becerra08@uptc.edu.co juan.castillo06@uptc.edu.co.

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Summary

This review explores multicomponent reactions (MCRs) for synthesizing 2-pyridone heterocycles, highlighting their diverse medicinal chemistry applications, including anticancer and antibacterial activities.

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Area of Science:

  • Medicinal Chemistry
  • Organic Synthesis
  • Drug Discovery

Background:

  • 2-Pyridone scaffolds are privileged in drug discovery due to favorable physicochemical properties and their ability to act as hydrogen bond donors/acceptors.
  • These heterocycles serve as effective nonpeptidic mimics in medicinal chemistry.
  • Their inherent metabolic stability, solubility, and lipophilicity make them attractive for pharmaceutical development.

Purpose of the Study:

  • To provide a comprehensive review of multicomponent reactions (MCRs) for synthesizing 2-pyridone-containing heterocycles.
  • To cover literature from 1999 to the present focusing on the bioactivities of MCR-derived 2-pyridones.
  • To analyze synthetic strategies, reaction mechanisms, and molecular docking simulations for these compounds.

Main Methods:

  • Literature review of articles published from 1999 to date.
  • Focus on multicomponent reactions (MCRs) for the synthesis of 2-pyridone derivatives.
  • Analysis of reported bioactivity data, synthetic routes, mechanisms, and docking studies.

Main Results:

  • Compilation of diverse biological activities including anticancer, antibacterial, antifungal, anti-inflammatory, α-glucosidase inhibition, and cardiotonic effects.
  • Detailed discussion of synthetic approaches and plausible reaction mechanisms for MCR-based 2-pyridone synthesis.
  • Presentation of molecular docking simulations to support structure-activity relationships.

Conclusions:

  • 2-Pyridone heterocycles synthesized via MCRs exhibit significant potential in drug discovery.
  • MCRs offer efficient and versatile routes to access diverse 2-pyridone derivatives with promising bioactivities.
  • Further exploration of MCRs and 2-pyridone scaffolds is warranted for developing novel therapeutic agents.