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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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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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α-Substituted ketones or aldehydes can be synthesized from enamines by the Stork enamine reaction, named after its pioneer Gilbert Stork. Enamines are useful synthetic intermediates where the lone pair on nitrogen is in conjugation with the C=C bond. They resemble enolate ions, as the resonance forms of both species have a nucleophilic α carbon.
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Elevating pyrrole derivative synthesis: a three-component revolution.

Lokesh Kumar S1, Anushka Servesh1, Sony J Chundattu2

  • 1Department of Chemistry, CHRIST - Deemed to Be University, Bengaluru, 560029, Karnataka, India.

Molecular Diversity
|May 20, 2024
PubMed
Summary
This summary is machine-generated.

This review highlights three-component reactions for synthesizing novel pyrrole derivatives, crucial for developing new pharmaceuticals. These multicomponent reactions (MCRs) offer efficient pathways to create diverse, functionalized pyrroles.

Keywords:
MulticomponentOne-potPyrroleReviewThree-component

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Area of Science:

  • Organic Chemistry
  • Medicinal Chemistry
  • Synthetic Chemistry

Background:

  • Pyrrole derivatives are vital pharmaceutical frameworks for numerous medications.
  • The increasing demand for biologically active compounds necessitates efficient synthesis methods.
  • Multicomponent reactions (MCRs) are powerful tools for constructing complex molecules.

Purpose of the Study:

  • To review and highlight three-component synthesis strategies for pyrrole derivatives.
  • To emphasize the significance of MCRs in creating diverse, multi-functionalized pyrroles.
  • To classify recent synthetic approaches based on starting materials and functional groups.

Main Methods:

  • Literature review of three-component pyrrole synthesis from 2016 to late 2023.
  • Analysis of reactions based on starting materials and functional groups involved in pyrrole ring formation.
  • Focus on one-pot synthetic methodologies.

Main Results:

  • Identification of various three-component reactions for substituted pyrrole synthesis.
  • Demonstration of MCRs' efficiency in generating complex pyrrole structures.
  • Classification of synthetic routes provides a clear overview of available methodologies.

Conclusions:

  • Three-component reactions are a valuable and efficient approach for synthesizing diverse pyrrole derivatives.
  • MCRs facilitate the creation of novel, multi-functionalized pyrroles for pharmaceutical applications.
  • This review consolidates recent advancements, aiding researchers in selecting appropriate synthetic strategies.