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Diels–Alder Reaction Forming Bridged Bicyclic Products: Stereochemistry01:29

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Diels–Alder reactions between cyclic dienes locked in an s-cis configuration and dienophiles yield bridged bicyclic products.
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[3,3] Sigmatropic Rearrangement of 1,5-Dienes: Cope Rearrangement01:21

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The Cope rearrangement is classified as a [3,3] sigmatropic shift in 1,5-dienes, leading to a more stable, isomeric 1,5-diene. The reaction involves a concerted movement of six electrons, four from two π bonds and two from a σ bond, via an energetically favorable chair-like transition state.
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Diels–Alder Reaction Forming Cyclic Products: Stereochemistry01:28

Diels–Alder Reaction Forming Cyclic Products: Stereochemistry

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The Diels–Alder reaction is one of the robust methods for synthesizing unsaturated six-membered rings. The reaction involves a concerted cyclic movement of six π electrons: four π electrons from the diene and two π electrons from the dienophile.
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Regioselectivity and Stereochemistry of Hydroboration02:36

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A significant aspect of hydroboration–oxidation is the regio- and stereochemical outcome of the reaction.
Hydroboration proceeds in a concerted fashion with the attack of borane on the π bond, giving a cyclic four-centered transition state. The –BH2 group is bonded to the less substituted carbon and –H to the more substituted carbon. The concerted nature requires the simultaneous addition of –H and –BH2 across the same face of the alkene giving syn stereochemistry.
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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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Preparation of 1° Amines: Hofmann and Curtius Rearrangement Overview01:07

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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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A Concise Route to Orthogonally Protected Bulgecinine.

Qiuyun Yang1, Pradip Shit1, Van T Nguyen1

  • 1Department of Chemistry and Biochemistry, University of Notre Dame, Notre Dame, Indiana 46556, United States.

The Journal of Organic Chemistry
|December 23, 2025
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Summary

Researchers developed a concise synthesis for bulgecinine, a key structure for inhibiting bacterial lytic transglycosylases essential for cell-envelope homeostasis. This method provides a crucial building block for developing new antibacterial agents.

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Area of Science:

  • Organic Chemistry
  • Medicinal Chemistry
  • Structural Biology

Background:

  • Bulgecinine is the core scaffold for inhibitors targeting bacterial lytic transglycosylases.
  • These enzymes are crucial for maintaining bacterial cell-envelope homeostasis.
  • The pyrrolidine ring of bulgecinine mimics a key intermediate in the enzymatic reaction.

Purpose of the Study:

  • To develop a concise and efficient synthetic route to protected bulgecinine.
  • To establish a reliable method for accessing this important structural motif for drug discovery.

Main Methods:

  • A nine-step linear synthesis was employed.
  • The key transformation involved a vinyl Grignard addition to a pyrrolidine-N-oxide intermediate.
  • Stereochemistry was confirmed using X-ray crystallography.

Main Results:

  • Protected bulgecinine (compound 9) was synthesized in 12% overall yield.
  • The synthesis established the correct absolute stereochemistry at three chiral centers.
  • X-ray structure analysis validated the compound's stereochemistry.

Conclusions:

  • A concise synthetic strategy for bulgecinine has been successfully developed.
  • This synthesis provides a valuable route to a key component for developing novel antibacterial agents.
  • The validated stereochemistry is critical for the design of potent enzyme inhibitors.