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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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Thermal Electrocyclic Reactions: Stereochemistry01:17

Thermal Electrocyclic Reactions: Stereochemistry

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The stereochemistry of electrocyclic reactions is strongly influenced by the orbital symmetry of the polyene HOMO. Under thermal conditions, the reaction proceeds via the ground-state HOMO.
Selection Rules: Thermal Activation
Conjugated systems containing an even number of π-electron pairs undergo a conrotatory ring closure. For example, thermal electrocyclization of (2E,4E)-2,4-hexadiene, a conjugated diene containing two π-electron pairs, gives trans-3,4-dimethylcyclobutene.
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Photochemical Electrocyclic Reactions: Stereochemistry01:26

Photochemical Electrocyclic Reactions: Stereochemistry

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The absorption of UV–visible light by conjugated systems causes the promotion of an electron from the ground state to the excited state. Consequently, photochemical electrocyclic reactions proceed via the excited-state HOMO rather than the ground-state HOMO. Since the ground- and excited-state HOMOs have different symmetries, the stereochemical outcome of electrocyclic reactions depends on the mode of activation; i.e., thermal or photochemical.
Selection Rules: Photochemical Activation
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Diels–Alder Reaction: Characteristics of Dienes01:29

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The Diels–Alder reaction brings together a diene and a dienophile to form a six-membered ring. Both components have unique characteristics that influence the rate of the reaction.
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Conformation
The simplest example of a diene is 1,3-butadiene, an acyclic conjugated π system. At room temperature, the molecule exists as a mixture of s-cis and s-trans conformers by virtue of rotation around the carbon–carbon single bond. Although the s-trans isomer is...
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[4+2] Cycloaddition of Conjugated Dienes: Diels–Alder Reaction01:16

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

Diels–Alder Reaction Forming Bridged Bicyclic Products: Stereochemistry

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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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Isolating Free Carbenes, their Mixed Dimers and Organic Radicals
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Stereoelectronic Features of a Complex Ketene Dimerization Reaction.

Robert D Barrows1, Mark J Dresel1, Thomas J Emge1

  • 1Department of Chemistry and Chemical Biology, Rutgers-The State University of New Jersey, 123 Bevier Road, Piscataway, NJ 08854, USA.

Molecules (Basel, Switzerland)
|January 11, 2022
PubMed
Summary
This summary is machine-generated.

Propanephosphonic acid anhydride (T3P) effectively amidates tetrahydroisoquinolin-1-one-4-carboxylic acid for antimalarial drug synthesis. Unexpected dimeric allenes and lactones formed via ketene dimerization were characterized.

Keywords:
Friedel–Craftsamidationarylketenecarbene insertiondecarbonylationdecarboxylationmalaria

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Area of Science:

  • Organic Chemistry
  • Medicinal Chemistry
  • Process Chemistry

Background:

  • The amidation of tetrahydroisoquinolin-1-one-4-carboxylic acid is crucial for synthesizing the antimalarial drug SJ733.
  • Optimizing this reaction is key for large-scale pharmaceutical production.

Purpose of the Study:

  • To investigate the amidation reaction using propanephosphonic acid anhydride (T3P).
  • To characterize byproducts formed during the T3P-mediated reaction of a specific tetrahydroisoquinolin-1-one derivative.

Main Methods:

  • Amidation reaction using propanephosphonic acid anhydride (T3P) and varying bases.
  • Characterization of reaction products using analytical techniques.
  • Mechanistic studies to elucidate product formation pathways.

Main Results:

  • Propanephosphonic acid anhydride (T3P) was found to be an effective amidation reagent.
  • Unexpected formation of dimeric allenes and lactones was observed, attributed to ketene dimerization.
  • Two novel monomeric products, a decarboxylated isoquinolone and a fused aryl ketone, were isolated and their formation mechanisms proposed.

Conclusions:

  • The T3P-mediated amidation offers a viable route for synthesizing antimalarial drug precursors.
  • Understanding byproduct formation, such as dimeric allenes and lactones, is essential for reaction optimization.
  • The study reveals novel reaction pathways and products from ketene intermediates.