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Related Concept Videos

Diels–Alder Reaction: Characteristics of Dienophiles01:24

Diels–Alder Reaction: Characteristics of Dienophiles

8.7K
In a Diels–Alder reaction, the diene is usually an electron-rich system and acts as a nucleophile, whereas the dienophile is electron-deficient and functions as an electrophile. Much like the diene, the nature of the dienophile significantly impacts the outcome of the reaction.
Characteristics of Dienophiles
Generally, the best dienophiles are alkenes containing electron-withdrawing substituents such as carbonyl, nitrile, and nitro groups. The feasibility of a Diels–Alder reaction...
8.7K
Reactions of Aldehydes and Ketones: Baeyer–Villiger Oxidation01:22

Reactions of Aldehydes and Ketones: Baeyer–Villiger Oxidation

5.4K
Baeyer–Villiger oxidation converts aldehydes to carboxylic acids and ketones to esters. The reaction uses peroxy acids or peracids and is often catalyzed by acid. The reaction is named after its pioneers, Adolf von Baeyer and Victor Villiger. The reaction is achieved by a wide range of peracids such as m-chloroperoxybenzoic acid (mCPBA), perbenzoic acid (C6H5COOOH), peracetic acid (CH3COOOH), hydrogen peroxide (H2O2), and tert-butyl hydroperoxide (t-BuOOH).
The carbonyl center is...
5.4K
Acid Halides to Amides: Aminolysis01:07

Acid Halides to Amides: Aminolysis

4.8K
Aminolysis is a nucleophilic acyl substitution reaction, where ammonia or amines act as nucleophiles to give the substitution product. Acid halides react with ammonia, primary amines, and secondary amines to yield primary, secondary, and tertiary amides, respectively.
In the first step of the aminolysis mechanism, the amine attacks the carbonyl carbon of the acyl chloride to form a tetrahedral intermediate. In the second step, the carbonyl group is re-formed with the elimination of a chloride...
4.8K
Nitriles to Amines: LiAlH4 Reduction00:55

Nitriles to Amines: LiAlH4 Reduction

5.2K
Nitriles are reduced to amines in the presence of strong reducing agents like lithium aluminum hydride through a typical nucleophilic acyl substitution. The reaction requires two equivalents of the reducing agent. The reducing agent acts as a source of hydride ions.
As shown below, the mechanism involves three steps. Firstly, the hydride ion acting as a nucleophile attacks the nitrile carbon to form an anion. In the second step, a second equivalent of the hydride ion attacks the anion to...
5.2K
Reduction of Alkenes: Asymmetric Catalytic Hydrogenation02:17

Reduction of Alkenes: Asymmetric Catalytic Hydrogenation

4.1K
Catalytic hydrogenation of alkenes is a transition-metal catalyzed reduction of the double bond using molecular hydrogen to give alkanes. The mode of hydrogen addition follows syn stereochemistry.
The metal catalyst used can be either heterogeneous or homogeneous. When hydrogenation of an alkene generates a chiral center, a pair of enantiomeric products is expected to form. However, an enantiomeric excess of one of the products can be facilitated using an enantioselective reaction or an...
4.1K
Aldol Condensation with β-Diesters: Knoevenagel Condensation01:27

Aldol Condensation with β-Diesters: Knoevenagel Condensation

4.1K
The Knoevenagel condensation is an aldol-type reaction involving the condensation of aldehydes or ketones with active methylene compounds such as β-diesters to produce substituted olefins.
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Facile Preparation of 2Z,4E-Dienamides by the Olefination of Electron-deficient Alkenes with Allyl Acetate
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Linear dialdehydes as promising substrates for aminocatalyzed transformations.

Indresh Kumar1, Panduga Ramaraju, Nisar A Mir

  • 1Department of Chemistry, Birla Institute of Technology and Science-Pilani, Pilani Campus, 333 031, Rajasthan, India. indresh.chemistry@gmail.com indresh.kumar@pilani.bits-pilani.ac.in.

Organic & Biomolecular Chemistry
|December 11, 2014
PubMed
Summary

Linear dialdehydes are effective substrates for amine-catalyzed domino reactions. These reactions enable the synthesis of complex molecules, including natural products and drugs, through cascade transformations.

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Area of Science:

  • Organic Chemistry
  • Catalysis
  • Synthetic Methodology

Background:

  • Organocatalytic domino reactions are advancing synthetic chemistry.
  • Amine activation of carbonyl compounds is a key strategy.
  • Linear dialdehydes offer unique structural features for cascade reactions.

Purpose of the Study:

  • To review the current applications of linear dialdehydes in amine-catalyzed transformations.
  • To highlight the potential of these substrates in synthesizing complex molecules.
  • To discuss the role of dialdehydes in cascade/tandem reactions.

Main Methods:

  • Review of literature on organocatalysis and linear dialdehydes.
  • Analysis of amine-catalyzed domino reactions involving dialdehydes.
  • Exploration of synthetic strategies for natural product and drug synthesis.

Main Results:

  • Linear dialdehydes serve as versatile substrates for amine-catalyzed domino reactions.
  • These reactions facilitate the construction of complex molecular scaffolds.
  • Succinaldehyde and glutaraldehyde are prominent examples of effective dialdehyde substrates.

Conclusions:

  • Amine-catalyzed transformations of linear dialdehydes provide efficient access to valuable compounds.
  • Dialdehydes are crucial building blocks for synthesizing biologically important molecules.
  • This approach holds significant potential for drug discovery and natural product synthesis.