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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 reactions between cyclic dienes locked in an s-cis configuration and dienophiles yield bridged bicyclic products.
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ortho–para-Directing Activators: –CH3, –OH, –⁠NH2, –OCH301:11

ortho–para-Directing Activators: –CH3, –OH, –⁠NH2, –OCH3

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All ortho–para directors, excluding halogens, are activating groups. These groups donate electrons to the ring, making the ring carbons electron-rich. Consequently, the reactivity of the aromatic ring towards electrophilic substitution increases. For instance, the nitration of anisole is about 10,000 times faster than the nitration of benzene. The electron-donating effect of the methoxy group in anisole activates the ortho and para positions on the ring and stabilizes the corresponding...
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Cycloaddition Reactions: Overview01:16

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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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The rate of acid-catalyzed hydration of alkenes depends on the alkene's structure, as the presence of alkyl substituents at the double bond can significantly influence the rate.
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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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Pd(II)-catalyzed C-H functionalizations directed by distal weakly coordinating functional groups.

Gang Li1, Li Wan1, Guofu Zhang1

  • 1Department of Chemistry, The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, California 92037, United States.

Journal of the American Chemical Society
|March 14, 2015
PubMed
Summary
This summary is machine-generated.

New ortho-C(sp(2))-H olefination and acetoxylation methods enable direct functionalization of phenylacetyl derivatives. These reactions utilize weak coordination and ligand acceleration for mild conditions, broadening synthetic utility.

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Area of Science:

  • Organic Chemistry
  • Catalysis
  • Synthetic Methodology

Background:

  • Direct C-H functionalization offers efficient synthetic routes.
  • Traditional methods often require directing groups or harsh conditions.
  • Weinreb amides, esters, and ketones are versatile synthetic intermediates.

Purpose of the Study:

  • To develop novel ortho-C(sp(2))-H olefination and acetoxylation reactions.
  • To achieve these transformations on phenylacetyl derivatives without additional directing groups.
  • To explore the scope and limitations of these new methodologies.

Main Methods:

  • Utilizing palladium(II) catalysis with a bisdentate amino acid ligand.
  • Employing distal weak coordination to direct C-H activation.
  • Investigating the role of ligand acceleration for mild reaction conditions.

Main Results:

  • Successful ortho-C(sp(2))-H olefination and acetoxylation of phenylacetyl Weinreb amides, esters, and ketones.
  • Demonstrated tolerance for longer distances between C-H bonds and directing functional groups.
  • Functionalization of more distal C-H bonds in hydrocinnamoyl ketones, Weinreb amides, and biphenyl Weinreb amides achieved.
  • Mechanistic studies supported the role of carbonyl groups in Pd(II)-directed C-H activation.

Conclusions:

  • Developed efficient and mild palladium-catalyzed C-H functionalization methods.
  • The strategy avoids the need for pre-installed directing groups.
  • The findings expand the utility of Weinreb amides and related compounds in organic synthesis.