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Preparation of 1° Amines: Hofmann and Curtius Rearrangement Mechanism01:26

Preparation of 1° Amines: Hofmann and Curtius Rearrangement Mechanism

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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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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

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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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Synthesis and Transformations of Bioactive Scaffolds via Modified Mannich and aza-Friedel-Crafts Reactions.

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  • 1Institute of Pharmaceutical Chemistry, University of Szeged, Eötvös u. 6, H-6720, Szeged, Hungary.

Chemical Record (New York, N.Y.)
|June 11, 2025
PubMed
Summary
This summary is machine-generated.

Researchers synthesized novel glycine derivatives with naphthol substituents, exploring their reactivity in cycloaddition and Mannich reactions. The study investigated potential antibacterial and anticancer activities of these new compounds.

Keywords:
ortho ‐quinone methides[4 + 2] cycloadditionanticancer activityefflux pumpsmodified Mannich reaction

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Area of Science:

  • Organic Synthesis
  • Medicinal Chemistry
  • Chemical Biology

Background:

  • Glycine-type precursors are versatile building blocks in organic synthesis.
  • Naphthol derivatives and 8-hydroxyquinoline are recognized for their biological significance.
  • Cyclic imines, indoles, and azaindoles are important heterocyclic scaffolds in drug discovery.

Purpose of the Study:

  • To synthesize novel bifunctional glycine-type precursors incorporating 2- and 1-naphthol moieties.
  • To investigate the reactivity of these precursors in [4+2] cycloaddition and Mannich reactions.
  • To evaluate the synthesized compounds for potential antibacterial and anticancer activities.

Main Methods:

  • Synthesis of glycine derivatives substituted with 2- and 1-naphthol.
  • Exploration of ortho-quinone methide intermediate stabilization in [4+2] cycloaddition reactions.
  • Examination of Mannich reactions involving 8-hydroxyquinoline analogs and subsequent transformations.
  • Design and synthesis of cyclic amine derivatives coupled with indole and 7-azaindole.
  • Preliminary biological screening for antibacterial and anticancer activity.

Main Results:

  • Successful synthesis of bifunctional glycine-type precursors.
  • Demonstration of precursor stabilization via ortho-quinone methide intermediates.
  • Formation of Mannich bases and their transformation into diarylmethane derivatives.
  • Systematic design and synthesis of novel cyclic amine-indole/azaindole conjugates.
  • Preliminary data on the structure-activity relationship regarding antibacterial and anticancer effects.

Conclusions:

  • Novel glycine derivatives with naphthol substituents were synthesized and characterized.
  • The reactivity of these compounds in key organic transformations was explored.
  • The synthesized compounds show potential for further development as antibacterial and anticancer agents.