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[4+2] Cycloaddition of Conjugated Dienes: Diels–Alder Reaction01:16

[4+2] Cycloaddition of Conjugated Dienes: Diels–Alder Reaction

The Diels–Alder reaction is an example of a thermal pericyclic reaction between a conjugated diene and an alkene or alkyne, commonly referred to as a dienophile. The reaction involves a concerted movement of six π electrons, four from the diene and two from the dienophile, forming an unsaturated six-membered ring. As a result, these reactions are classified as [4+2] cycloadditions.
Electrophilic 1,2- and 1,4-Addition of HX to 1,3-Butadiene01:17

Electrophilic 1,2- and 1,4-Addition of HX to 1,3-Butadiene

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Conformations of Cyclohexane02:11

Conformations of Cyclohexane

Cyclohexane does not exist in a planar form due to the high angle and torsional strain it would experience in the planar structure. Instead, it adopts non-planar chair and boat conformations.
The chair form is the most stable and derives its name from its resemblance to the “easy chair.” In the chair conformation, two carbon atoms are arranged out-of-plane — one above and one below, minimizing the torsional strain. In the chair form, the bond angle is very close to the ideal tetrahedral value,...
Cycloaddition Reactions: Overview01:16

Cycloaddition Reactions: Overview

Cycloadditions are one of the most valuable and effective synthesis routes to form cyclic compounds. These are concerted pericyclic reactions between two unsaturated compounds resulting in a cyclic product with two new σ bonds formed at the expense of π bonds. The [4 + 2] cycloaddition, known as the Diels–Alder reaction, is the most common. The other example is a [2 + 2] cycloaddition.
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Diels–Alder Reaction Forming Bridged Bicyclic Products: Stereochemistry

Diels–Alder reactions between cyclic dienes locked in an s-cis configuration and dienophiles yield bridged bicyclic products.
Electrophilic Addition of HX to 1,3-Butadiene: Thermodynamic vs Kinetic Control01:23

Electrophilic Addition of HX to 1,3-Butadiene: Thermodynamic vs Kinetic Control

The addition of a hydrogen halide to 1,3-butadiene gives a mixture of 1,2- and 1,4-adducts. Since more substituted alkenes are more stable, the 1,4-adduct is expected to be the major product. However, the product distribution is strongly influenced by temperature; low temperature favors the 1,2-adduct, whereas the 1,4-adduct is predominant at high temperature.

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DNA Nanotubes as a Versatile Tool to Study Semiflexible Polymers
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New β-strand templates constrained by Huisgen cycloaddition.

Ashok D Pehere1, Andrew D Abell

  • 1School of Chemistry & Physics, The University of Adelaide, North Terrace, Adelaide SA 5005, Australia.

Organic Letters
|February 21, 2012
PubMed
Summary

New peptidic macrocycles mimic beta-strand structures, acting as potent calpain protease inhibitors. These novel templates offer versatile applications for targeting various proteases.

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Area of Science:

  • Medicinal Chemistry
  • Organic Chemistry
  • Biochemistry

Background:

  • Protease inhibitors are crucial therapeutic agents.
  • Constrained peptide conformations can enhance target specificity and potency.
  • Beta-strand mimetics offer a promising scaffold for drug design.

Purpose of the Study:

  • To develop novel peptidic templates that adopt a stable beta-strand conformation.
  • To investigate the inhibitory activity of these templates against the protease calpain.
  • To establish optimized conditions for the synthesis of these constrained peptides.

Main Methods:

  • Synthesis of tripeptides with acetylene and azide functionalities.
  • Huisgen cycloaddition to form macrocyclic peptidic templates.
  • Nuclear Magnetic Resonance (NMR) studies to determine macrocycle conformations.
  • Enzyme inhibition assays to evaluate calpain inhibition.

Main Results:

  • Successfully synthesized novel peptidic macrocycles constrained into a beta-strand geometry.
  • NMR analysis confirmed the defined conformations of the macrocycles.
  • Templates adopting a beta-strand conformation demonstrated potent inhibition of calpain.
  • Optimized synthetic conditions were established for template preparation.

Conclusions:

  • The developed peptidic templates effectively mimic beta-strand structures.
  • These constrained peptides are potent inhibitors of calpain.
  • The synthetic methodology is adaptable for targeting other proteases and applications requiring beta-strand geometry.