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Related Concept Videos

Preparation of 1° Amines: Azide Synthesis01:22

Preparation of 1° Amines: Azide Synthesis

3.9K
Direct alkylation of ammonia produces polyalkylated amines, along with a quaternary ammonium salt. To exclusively prepare primary amines, the azide synthesis method can be used.
Azide ions act as good nucleophiles and react with unhindered alkyl halides to form alkyl azides. Alkyl azides do not participate in further nucleophilic substitution reactions, thereby eliminating the chances of polyalkylated products. Alkyl azides are reduced by hydride-based reducing agents, like lithium aluminum...
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Preparation of Amines: Reductive Amination of Aldehydes and Ketones01:38

Preparation of Amines: Reductive Amination of Aldehydes and Ketones

2.8K
Carbonyl compounds and primary amines undergo reductive amination first to produce imines, followed by secondary amines in the same reaction mixture, using selective reducing agents like sodium cyanoborohydride or sodium triacetoxyborohydride. Reductive amination produces different degrees of substitution of amines depending on the starting amine substrate.
2.8K
Preparation of 1° Amines: Gabriel Synthesis01:28

Preparation of 1° Amines: Gabriel Synthesis

3.6K
Direct alkylation is not a suitable method for synthesizing amines because it produces polyalkylated products. Gabriel synthesis is the most preferred method to exclusively make primary amines. The method uses phthalimide, which contains a protected form of nitrogen that participates in alkylation only once to predominantly give primary amines.
Strong bases like NaOH or KOH deprotonate the phthalimide to form the corresponding anion, which acts as a nucleophile. Further, the anion attacks an...
3.6K
Preparation of Amines: Alkylation of Ammonia and Amines01:30

Preparation of Amines: Alkylation of Ammonia and Amines

3.4K
Alkylation is one of the methods used to prepare amines. Direct alkylation of ammonia or a primary amine with an alkyl halide gives polyalkylated amines along with a quaternary ammonium salt through successive SN2 reactions. This process of making the quaternary salt through the direct alkylation method is called exhaustive alkylation.
Each alkylation step makes the nitrogen center more nucleophilic, which triggers successive alkylations until a quaternary ammonium salt is formed. Considering...
3.4K
Cycloaddition Reactions: MO Requirements for Photochemical Activation01:12

Cycloaddition Reactions: MO Requirements for Photochemical Activation

2.1K
Some cycloaddition reactions are activated by heat, while others are initiated by light. For example, a [2 + 2] cycloaddition between two ethylene molecules occurs only in the presence of light. It is photochemically allowed but thermally forbidden.
2.1K
Aldehydes and Ketones with Amines: Imine Formation Mechanism01:23

Aldehydes and Ketones with Amines: Imine Formation Mechanism

5.6K
Imine formation involves the addition of carbonyl compounds to a primary amine. It begins with the generation of carbinolamine through a series of steps involving an initial nucleophilic attack and then several proton transfer reactions. The second part includes the elimination of water, as a leaving group, to give the imine.
Imines are formed under mildly acidic conditions. A pH of 4.5 is ideal for the reaction.
If the pH is low or the solution is too acidic, the reaction slows down in the...
5.6K

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[DPEPhosbcpCu]PF6: A General and Broadly Applicable Copper-Based Photoredox Catalyst
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Functionalized Polyamine Synthesis with Photoredox Catalysis.

Yuta Makihara1, Bumpei Maeda1, Ryohei Akiyoshi1

  • 1Department of Chemistry, School of Science, Kwansei Gakuin University, Gakuen Uegahara 1, Sanda, Hyogo, 669-1330, Japan.

Chemistry (Weinheim an Der Bergstrasse, Germany)
|January 24, 2024
PubMed
Summary

This study introduces a new photoredox-catalyzed method for modifying polyamines, enabling the creation of novel molecular probes. This approach simplifies the synthesis of functionalized polyamines for chemical biology research.

Keywords:
alkylationphotoredox catalystpolyamine

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Area of Science:

  • Biochemistry
  • Organic Chemistry
  • Chemical Biology

Background:

  • Polyamines like putrescine and spermidine are essential biomolecules involved in numerous cellular functions.
  • Structurally modified polyamines represent a promising but underexplored area for novel bioactive compound discovery.
  • The synthesis of functionalized polyamines has been historically challenging, limiting their structural diversification.

Purpose of the Study:

  • To develop an efficient method for the structural diversification of polyamines.
  • To overcome the synthetic limitations in accessing functionalized polyamines.
  • To enable the creation of novel molecular probes for chemical biology applications.

Main Methods:

  • Utilized photoredox catalysis for the functionalization of polyamines.
  • Demonstrated rapid attachment of functional groups, including fluorophores.
  • Developed a versatile strategy for polyamine structure modification.

Main Results:

  • Achieved efficient photoredox-catalyzed functionalization of polyamines.
  • Successfully diversified polyamine structures through a facile synthetic route.
  • Enabled the straightforward conjugation of fluorophores to polyamines.

Conclusions:

  • Photoredox catalysis offers a powerful tool for polyamine functionalization.
  • This method facilitates the development of advanced molecular probes.
  • The approach opens new avenues for discovering bioactive compounds and advancing chemical biology.