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Related Concept Videos

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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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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Related Experiment Video

Updated: Apr 1, 2026

Preparation of Enantiopure Non-Activated Aziridines and Synthesis of Biemamide B, D, and epiallo-Isomuscarine
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An "Inside-Out" Strategy Enables a 14-Step Total Synthesis of Hispidospermidin.

Charis Amber1, Tenta Nakamura1, Matthew Amoako1

  • 1Department of Chemistry, University of California, Berkeley, Berkeley, California 94720, United States.

JACS Au
|January 30, 2026
PubMed
Summary

This study presents a novel, shorter synthesis of hispidospermidin by building complexity early. The "Inside-Out" strategy rapidly constructs the core bicyclo[3.3.1]-nonane structure, significantly reducing step count.

Keywords:
hispidospermidininside-out strategyisomerizationretrosynthesistotal synthesis

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Area of Science:

  • Organic Chemistry
  • Synthetic Chemistry
  • Total Synthesis

Background:

  • Traditional retrosynthesis prioritizes early deconstruction of molecular complexity.
  • Forward synthesis approaches that rapidly build complexity early are less common.
  • The polycyclic sesquiterpenoid alkaloid hispidospermidin presents a significant synthetic challenge.

Purpose of the Study:

  • To develop a novel, efficient, and shorter total synthesis of hispidospermidin.
  • To demonstrate the "Inside-Out" strategy for rapid complexity generation in total synthesis.
  • To explore protective group-free synthetic routes for complex natural products.

Main Methods:

  • A 14-step protective group-free total synthesis of hispidospermidin.
  • Early-stage complexity-generating bicycle formation (bicyclo[3.3.1]-nonane core).
  • Key reactions include Giese conjugate addition, novel isomerization, and C-H desaturation/etherification.

Main Results:

  • Successful synthesis of hispidospermidin in 14 steps, significantly fewer than previous syntheses (23-31 steps).
  • The primary complexity element, the bicyclo[3.3.1]-nonane core, was constructed in the first step.
  • A novel isomerization enabled a one-pot protocol for the trans-hydrindane moiety.

Conclusions:

  • The "Inside-Out" strategy, generating complexity early, is effective for expediting total synthesis.
  • This approach offers a significant improvement in efficiency for synthesizing complex molecules like hispidospermidin.
  • The developed synthetic route provides a valuable platform for further exploration of related natural products.