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Preparation of Diols and Pinacol Rearrangement01:57

Preparation of Diols and Pinacol Rearrangement

Compounds bearing two hydroxyl groups are known as diols. When the hydroxyl groups are located on adjacent carbon atoms, the diols are called vicinal diols or glycols. Under acidic conditions, vicinal diols undergo a specific reaction called pinacol rearrangement.
The reaction begins with transferring a proton from the acid catalyst to one of the hydroxyl groups, producing an oxonium ion.
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.
[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.
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Pericyclic Reactions: Introduction01:17

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Pericyclic reactions are organic reactions that occur via a concerted mechanism without generating any intermediates. The reactions proceed through the movement of electrons in a closed loop to form a cyclic transition state, where rearrangement of the σ and π bonds yields specific products.
Pericyclic reactions can be classified into three categories: electrocyclic reactions, cycloaddition reactions, and sigmatropic rearrangements. Electrocyclic reactions and sigmatropic rearrangements are...
Diels–Alder Reaction Forming Cyclic Products: Stereochemistry01:28

Diels–Alder Reaction Forming Cyclic Products: Stereochemistry

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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A Pd(0)-mediated indole (macro)cyclization reaction.

Steven P Breazzano1, Yam B Poudel, Dale L Boger

  • 1Department of Chemistry and the Skaggs Institute for Chemical Biology, The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, California 92037, USA.

Journal of the American Chemical Society
|January 10, 2013
PubMed
Summary
This summary is machine-generated.

The Larock indole annulation is a versatile method for synthesizing cyclic and macrocyclic compounds with embedded indoles. This study expands its utility, revealing a new catalytic variant and a powerful palladium catalyst system.

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Area of Science:

  • Organic Chemistry
  • Synthetic Chemistry

Background:

  • The Larock indole annulation is a key reaction in organic synthesis.
  • Its application in macrocyclization and complex molecule synthesis requires further exploration.

Purpose of the Study:

  • To systematically study the Larock indole annulation for macrocyclization.
  • To explore its utility in synthesizing chloropeptin I/II ring systems and unnatural isomers.
  • To extend its application to intramolecular cyclizations and develop catalytic variants.

Main Methods:

  • Systematic investigation of the Larock indole annulation scope.
  • Application in macrocyclization and intramolecular cyclizations.
  • Development and evaluation of a catalytic variant with a Pd(2)(dba)(3) catalyst system.

Main Results:

  • The Larock indole annulation is effective for synthesizing diverse cyclic and macrocyclic systems containing indoles.
  • The method tolerates various functional groups and accommodates ring sizes up to 28-membered.
  • A novel catalytic variant and a potent palladium catalyst system were developed, enhancing reactivity and catalysis.

Conclusions:

  • The Larock indole annulation is a powerful and versatile method for indole-containing macrocycle synthesis.
  • This study introduces a catalytic variant and optimized conditions, expanding its synthetic utility.
  • The findings complement existing cross-coupling reactions for constructing complex cyclic structures.