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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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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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Diazonium Group Substitution with Halogens and Cyanide: Sandmeyer and Schiemann Reactions01:20

Diazonium Group Substitution with Halogens and Cyanide: Sandmeyer and Schiemann Reactions

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Arenediazonium substitution reactions occur when the diazonium group is substituted by various functional groups such as halides, hydroxyl, nitrile, etc. For instance, arenediazonium salts react with copper(I) salts of chloride, bromide, or cyanide to form corresponding aryl chlorides, bromides, and nitriles. These reactions are named Sandmeyer reactions. Although the mechanism of this reaction is complicated, as illustrated in Figure 1, they are believed to progress via an aryl copper...
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Nucleophilic Aromatic Substitution of Aryldiazonium Salts: Aromatic SN101:14

Nucleophilic Aromatic Substitution of Aryldiazonium Salts: Aromatic SN1

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Treating arylamines with nitrous acid gives aryldiazonium salts that are effective substrates in nucleophilic aromatic substitution reactions. The diazonio group in these salts can be easily displaced by different nucleophiles, yielding a wide variety of substituted benzenes. The leaving group departs as nitrogen gas, and this easy elimination is the driving force for the substitution reaction.
In the Sandmeyer reaction, for example, the diazonio group is replaced by a chloro, bromo,...
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Nucleophilic Aromatic Substitution: Elimination–Addition01:11

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Simple aryl halides do not react with nucleophiles. However, nucleophilic aromatic substitutions can be forced under certain conditions, such as high temperatures or strong bases. The mechanism of substitution under such conditions involves the highly unstable and reactive benzyne intermediate. Benzyne contains equivalent carbon centers at both ends of the triple bond, each of which is equally susceptible to nucleophilic attack. This 50–50 distribution of products is...
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[4+2] Cycloaddition of Conjugated Dienes: Diels–Alder Reaction01:16

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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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Cycloadditions of noncomplementary substituted 1,2,3-triazines.

Erin D Anderson1, Adam S Duerfeldt, Kaicheng Zhu

  • 1Department of Chemistry and The Skaggs Institute for Chemical Biology, The Scripps Research Institute , 10550 North Torrey Pines Road, La Jolla, California 92037, United States.

Organic Letters
|September 16, 2014
PubMed
Summary
This summary is machine-generated.

This study explores [4 + 2] cycloaddition reactions using substituted 1,2,3-triazines. It details how substituent electronic and steric effects influence reactivity and regioselectivity, yielding functionalized heterocycles.

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Area of Science:

  • Organic Chemistry
  • Heterocyclic Chemistry
  • Reaction Mechanisms

Background:

  • 1,2,3-Triazines are versatile heterocyclic compounds.
  • Cycloaddition reactions are crucial for synthesizing complex molecules.
  • Understanding substituent effects is key to controlling reactivity.

Purpose of the Study:

  • To investigate the scope of [4 + 2] cycloaddition reactions involving substituted 1,2,3-triazines.
  • To elucidate the impact of electronic and steric factors on reaction outcomes.
  • To provide access to highly functionalized heterocycles.

Main Methods:

  • Utilizing substituted 1,2,3-triazines with electron-withdrawing groups.
  • Reacting triazines with nucleophiles such as amidines, enamines, and ynamines.
  • Analyzing reaction products to determine regioselectivity and identify key influencing factors.

Main Results:

  • Defined the influence of electronic and steric effects of substituents on 1,2,3-triazine reactivity.
  • Identified the preferred reaction modes (C4/N1 vs C5/N2).
  • Achieved regioselective cycloaddition, yielding diverse functionalized heterocycles.

Conclusions:

  • Substituent properties critically control the reactivity and regioselectivity of [4 + 2] cycloadditions with 1,2,3-triazines.
  • The study provides a framework for designing and executing these reactions for targeted synthesis.
  • This work expands synthetic routes to valuable heterocyclic compounds.