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Preparation of Alkynes: Alkylation Reaction02:27

Preparation of Alkynes: Alkylation Reaction

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Introduction
Alkylation of terminal alkynes with primary alkyl halides in the presence of a strong base like sodium amide is one of the common methods for the synthesis of longer carbon-chain alkynes. For example, treatment of 1-propyne with sodium amide followed by reaction with ethyl bromide yields 2-pentyne.
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Preparation of Amines: Alkylation of Ammonia and Amines01:30

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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...
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Preparation of Amines: Reductive Amination of Aldehydes and Ketones01:38

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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.
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Preparation of 1° Amines: Azide Synthesis01:22

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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 1° Amines: Gabriel Synthesis01:28

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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.
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Carboxylic acids react with diazomethane in an ether solvent via alkylation at the carboxylate oxygen atom to give methyl esters of the corresponding acid with excellent yields.
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Direct Alkylative Amination Using 1-Allylsilatrane.

David Raveenthrarajan1, Thershan Satkunarajah1,2, Brooklyn A Kostiuk1

  • 1Department of Chemistry & Biology, Toronto Metropolitan University, 350 Victoria St., Toronto, ON, M5B 2K3, Canada.

Chemistry (Weinheim an Der Bergstrasse, Germany)
|May 30, 2023
PubMed
Summary
This summary is machine-generated.

This study presents a metal-free method for synthesizing homoallylic amines. The direct alkylative amination of aromatic aldehydes and anilines uses 1-allylsilatrane, avoiding harsh conditions.

Keywords:
aldehydeamineheterocyclesreductive aminationsilatrane

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Area of Science:

  • Organic Chemistry
  • Synthetic Chemistry

Background:

  • Homoallylic amines are valuable synthetic intermediates.
  • Traditional synthesis methods often require preformed imines, metal catalysts, or protecting groups.

Purpose of the Study:

  • To develop a more efficient and accessible method for synthesizing homoallylic amines.
  • To establish a metal-free, air- and water-tolerant alkylative amination procedure.

Main Methods:

  • Direct alkylative amination of aromatic aldehydes and anilines.
  • Utilized 1-allylsilatrane as the key reagent.
  • Employed a metal-free, air- and water-tolerant reaction condition.

Main Results:

  • Successfully synthesized homoallylic amines directly from aromatic aldehydes and anilines.
  • Demonstrated the utility of 1-allylsilatrane in a metal-free catalytic system.
  • The procedure is tolerant to air and water, simplifying experimental setup.

Conclusions:

  • The developed method offers a straightforward and robust route to homoallylic amines.
  • 1-allylsilatrane is an effective reagent for direct alkylative amination.
  • This approach bypasses the need for preformed imines and metal catalysts, enhancing synthetic efficiency.