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Preparation of 1° Amines: Hofmann and Curtius Rearrangement Overview01:07

Preparation of 1° Amines: Hofmann and Curtius Rearrangement Overview

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In the presence of an aqueous base and a halogen, primary amides can lose the carbonyl (as carbon dioxide) and undergo rearrangement to form primary amines. This reaction, called the Hofmann rearrangement, can produce primary amines (aryl and alkyl) in high yields without contamination by secondary and tertiary amines.
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Preparation of 1° Amines: Gabriel Synthesis01:28

Preparation of 1° Amines: Gabriel Synthesis

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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.
Strong bases like NaOH or KOH deprotonate the phthalimide to form the corresponding anion, which acts as a nucleophile. Further, the anion attacks an...
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Preparation of 1° Amines: Azide Synthesis01:22

Preparation of 1° Amines: Azide Synthesis

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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: Hofmann and Curtius Rearrangement Mechanism01:26

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The Hofmann and Curtius rearrangement reactions can be applied to synthesize primary amines from carboxylic acid derivatives such as amides and acyl azides. In the Hofmann rearrangement, a primary amide undergoes deprotonation in the presence of a base, followed by halogenation to generate an N-haloamide. A second proton abstraction produces a stabilized anionic species, which rearranges to an isocyanate intermediate via an alkyl group migration from the carbonyl carbon to the neighboring...
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Synthesis of α-Substituted Carbonyl Compounds: The Stork Enamine Reaction01:26

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α-Substituted ketones or aldehydes can be synthesized from enamines by the Stork enamine reaction, named after its pioneer Gilbert Stork. Enamines are useful synthetic intermediates where the lone pair on nitrogen is in conjugation with the C=C bond. They resemble enolate ions, as the resonance forms of both species have a nucleophilic α carbon.
4.2K
Nomenclature of Aryl and Heterocyclic Amines01:10

Nomenclature of Aryl and Heterocyclic Amines

3.2K
The simplest aromatic amine is phenylamine, which contains an –NH2 functionality directly attached to an aromatic ring. The name aniline is designated for this skeleton. As shown in Figure 1, the common names of the functionalized anilines involve prefixes ortho-, meta-, and para- to indicate the substitution position. Different functionalized aniline derivatives also have notable trivial names.
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Preparation of Enantiopure Non-Activated Aziridines and Synthesis of Biemamide B, D, and epiallo-Isomuscarine
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11-Step Total Synthesis of Araiosamines.

Maoqun Tian1, Ming Yan1, Phil S Baran1

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

Journal of the American Chemical Society
|November 3, 2016
PubMed
Summary
This summary is machine-generated.

Researchers developed a concise synthesis for marine alkaloids called araiosamines. These compounds show antibacterial activity against Gram-positive and Gram-negative bacteria, challenging previous findings.

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Area of Science:

  • Marine natural products chemistry
  • Organic synthesis
  • Medicinal chemistry

Background:

  • Marine alkaloids, such as araiosamines, are complex molecules with potential bioactivity.
  • Their intricate structures, featuring dense functionality and stereochemistry, pose significant synthetic challenges.
  • Previous reports suggested a lack of antibacterial activity for these compounds.

Purpose of the Study:

  • To develop an efficient synthetic route to araiosamines.
  • To determine the absolute configuration of these marine alkaloids.
  • To evaluate the antibacterial potential of synthetic araiosamines.

Main Methods:

  • Development of a novel guanidine installation reagent.
  • Application of a highly selective C-H functionalization strategy.
  • Convergent synthesis intersecting a proposed biosynthetic intermediate.

Main Results:

  • A concise synthetic pathway to araiosamines was established.
  • The absolute configuration of the target alkaloids was assigned.
  • Synthetic araiosamines demonstrated significant potency against both Gram-positive and Gram-negative bacteria.

Conclusions:

  • The developed synthetic route provides access to valuable marine alkaloids.
  • The antibacterial activity of araiosamines was confirmed, contrary to prior reports.
  • This work opens avenues for further exploration of marine natural products in drug discovery.