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<p><b>New page</b></p><div>[[File:oxindole.png|thumb|oxindole.png]] '''Oxindole''' is an organic compound with the molecular formula C8H7NO. It is a derivative of [[indole]], a bicyclic structure consisting of a six-membered benzene ring fused to a five-membered nitrogen-containing pyrrole ring. Oxindole is characterized by the presence of a carbonyl group (C=O) at the second position of the indole ring, making it a ketone.<br />
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==Structure and Properties==<br />
Oxindole has a planar structure due to the conjugation of the benzene and pyrrole rings. The carbonyl group at the second position introduces a degree of polarity to the molecule, affecting its chemical reactivity and physical properties. The compound is typically a white to light yellow crystalline solid at room temperature.<br />
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==Synthesis==<br />
Oxindole can be synthesized through several methods, including the [[Fischer indole synthesis]] and the [[Buchwald-Hartwig amination]]. One common method involves the cyclization of o-nitrophenylacetic acid derivatives, followed by reduction of the nitro group to an amine and subsequent cyclization to form the oxindole structure.<br />
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==Reactivity and Derivatives==<br />
Oxindole is a versatile intermediate in organic synthesis. It can undergo various chemical reactions, including:<br />
* [[Reduction]] to form indoline derivatives.<br />
* [[Oxidation]] to produce isatin, another important indole derivative.<br />
* [[Alkylation]] and [[acylation]] reactions at the nitrogen atom.<br />
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Derivatives of oxindole are of significant interest in medicinal chemistry due to their biological activities. For example, some oxindole derivatives exhibit anti-inflammatory, anticancer, and antiviral properties.<br />
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==Biological Significance==<br />
Oxindole and its derivatives are found in various natural products and have been studied for their potential therapeutic applications. They are known to interact with several biological targets, including enzymes and receptors, making them valuable in drug discovery and development.<br />
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==Applications==<br />
Oxindole and its derivatives are used in the synthesis of pharmaceuticals, agrochemicals, and dyes. Their ability to modulate biological pathways makes them important in the development of new therapeutic agents.<br />
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==See Also==<br />
* [[Indole]]<br />
* [[Isatin]]<br />
* [[Fischer indole synthesis]]<br />
* [[Buchwald-Hartwig amination]]<br />
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==References==<br />
{{Reflist}}<br />
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==External Links==<br />
{{Commons category|Oxindole}}<br />
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[[Category:Indoles]]<br />
[[Category:Ketones]]<br />
[[Category:Organic compounds]]<br />
[[Category:Pharmacology]]<br />
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