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01:16Aldehydes and Ketones with Amines: Imine and Enamine Formation Overview
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Primary amines react with carbonyl compounds—aldehydes and ketones—to generate imines. Imines consist of a C=N double bond and are named Schiff bases after its discoverer—the German chemist Hugo Schiff. On the other hand, secondary amines react with carbonyl compounds to give enamines. In enamines, the presence of a C=C double bond adjacent to the nitrogen atom leads to the delocalization of the lone pair.
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01:13Relative Reactivity of Carboxylic Acid Derivatives
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Carboxylic acid derivatives such as acid halides, anhydrides, esters, and amides undergo nucleophilic acyl substitution reactions with varying degrees of reactivity.
A key factor in assessing the reactivity of the acid derivatives is the basicity of the substituent or the leaving group. The lower the basicity of the leaving group, the higher the reactivity of the derivative. The basicity of the leaving group follows this order:
Halide ions < Acyloxy ions < Alkoxy ions < Amine ions
A key factor in assessing the reactivity of the acid derivatives is the basicity of the substituent or the leaving group. The lower the basicity of the leaving group, the higher the reactivity of the derivative. The basicity of the leaving group follows this order:
Halide ions < Acyloxy ions < Alkoxy ions < Amine ions
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01:16Cycloaddition 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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01:29Diels–Alder Reaction: Characteristics of Dienes
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The Diels–Alder reaction brings together a diene and a dienophile to form a six-membered ring. Both components have unique characteristics that influence the rate of the reaction.
Characteristics of the diene
Conformation
The simplest example of a diene is 1,3-butadiene, an acyclic conjugated π system. At room temperature, the molecule exists as a mixture of s-cis and s-trans conformers by virtue of rotation around the carbon–carbon single bond. Although the s-trans isomer is...
Characteristics of the diene
Conformation
The simplest example of a diene is 1,3-butadiene, an acyclic conjugated π system. At room temperature, the molecule exists as a mixture of s-cis and s-trans conformers by virtue of rotation around the carbon–carbon single bond. Although the s-trans isomer is...
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01:11ortho–para-Directing Activators: –CH3, –OH, –NH2, –OCH3
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All ortho–para directors, excluding halogens, are activating groups. These groups donate electrons to the ring, making the ring carbons electron-rich. Consequently, the reactivity of the aromatic ring towards electrophilic substitution increases. For instance, the nitration of anisole is about 10,000 times faster than the nitration of benzene. The electron-donating effect of the methoxy group in anisole activates the ortho and para positions on the ring and stabilizes the corresponding...
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01:13Electrophilic Aromatic Substitution: Fluorination and Iodination of Benzene
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Bromination and chlorination of aromatic rings by electrophilic aromatic substitution reactions are easily achieved, but fluorination and iodination are difficult to achieve. Fluorine is so reactive that its reaction with benzene is difficult to control, resulting in poor yields of monofluoroaromatic products. To address this, Selectfluor reagent is used as a fluorine source in which a fluorine atom is bonded to a positively charged nitrogen.
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Synthesis and Reactivity of Indole Derivatives: A Comprehensive Review.
Oumaima Kassi1, Souad Zerbib1, Mustapha Dib2
1Laboratory of Molecular Chemistry, Materials and Catalysis, Faculty of Sciences and Technology, University Sultan Moulay Slimane BP 523, 23000, Beni-Mellal, Morocco.
Current Organic Synthesis
|April 20, 2026
Summary
This review covers indole derivatives, essential N,O-heterocyclic compounds with diverse pharmacological uses. It highlights classical and green synthesis methods for creating novel indole-based molecules for drug discovery and other applications.
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Area of Science:
- Organic Chemistry
- Medicinal Chemistry
- Heterocyclic Chemistry
Background:
- Indole derivatives are N,O-heterocyclic compounds with significant pharmacological properties.
- The indole scaffold is crucial in natural products and synthetic drug design.
- These compounds find applications as flavoring agents, fragrances, and in pharmaceutical formulations.
Purpose of the Study:
- To review classical and modern synthetic strategies for indole derivatives.
- To emphasize the importance of indole structures in developing new drug molecules.
- To discuss green chemistry approaches for indole synthesis.
Main Methods:
- Fischer indole synthesis
- Skraup synthesis
- Discussion of green and efficient synthetic protocols
Main Results:
- Classical methods like Fischer and Skraup synthesis remain vital for complex indole synthesis.
- Green methods offer improved yield, selectivity, and sustainability.
- Various synthetic routes enable the development of diverse indole derivatives.
Conclusions:
- Indole derivatives are versatile compounds with broad pharmacological potential.
- Efficient and sustainable synthesis methods are key for advancing indole-based drug discovery.
- Continued exploration of indole chemistry promises novel therapeutic agents.