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Nucleophilic Aromatic Substitution: Addition–Elimination (SNAr)01:30

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Nucleophilic substitution in aromatic compounds is feasible in substrates bearing strong electron-withdrawing substituents positioned ortho or para to the leaving group. The reaction proceeds via two steps: the addition of the nucleophile and the elimination of the leaving group.
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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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Nucleophilic Aromatic Substitution of Aryldiazonium Salts: Aromatic SN101:14

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Treating arylamines with nitrous acid gives aryldiazonium salts that are effective substrates in nucleophilic aromatic substitution reactions. The diazonio group in these salts can be easily displaced by different nucleophiles, yielding a wide variety of substituted benzenes. The leaving group departs as nitrogen gas, and this easy elimination is the driving force for the substitution reaction.
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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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Nomenclature of Aryl and Heterocyclic Amines01:10

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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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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.
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Concise Synthesis of Naphthalene-Based 14-Aza-12-Oxasteroids.

Smriti Srivastava1, Jun Luo1, Daniel Whalen1

  • 1Department of Chemistry, Acadia University, Wolfville, NS B4P 2R6, Canada.

Molecules (Basel, Switzerland)
|January 25, 2025
PubMed
Summary

A new four-step, transition metal-free synthesis creates complex 14-aza-12-oxasteroids from simple 2-naphthol derivatives. This efficient method builds two rings, forming the steroidal framework for novel compound discovery.

Keywords:
14-aza-12-oxosteroidDean–Stark condensationSugasawa reactiondouble dehydrationheterosteroids

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Area of Science:

  • Organic Chemistry
  • Synthetic Chemistry
  • Medicinal Chemistry

Background:

  • Steroidal compounds are crucial in medicine.
  • Developing novel synthetic routes for complex heterosteroids is essential for drug discovery.

Purpose of the Study:

  • To develop a concise, transition metal-free synthetic pathway for tetracyclic 14-aza-12-oxasteroids.
  • To explore the synthesis of novel steroidal frameworks from readily available precursors.

Main Methods:

  • Four-step synthesis starting from 2-naphthol analogues.
  • Utilized Bucherer reaction, Sugasawa reaction, borohydride reduction, double dehydrations, and intramolecular cyclizations.
  • One-pot tandem formation of C-N, C-O, and amide bonds.

Main Results:

  • Successfully synthesized a series of 14-aza-12-oxasteroids in moderate yields.
  • The synthetic strategy efficiently generated two additional rings, completing the steroidal framework.
  • Confirmed the structure of a representative product via single crystal X-ray crystallography.

Conclusions:

  • Developed an efficient and transition metal-free four-step synthetic route to 14-aza-12-oxasteroids.
  • The strategy allows for the construction of complex steroidal frameworks from simple starting materials.
  • This pathway offers a valuable tool for the synthesis of novel steroidal compounds with potential therapeutic applications.