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Diels–Alder Reaction: Characteristics of Dienes01:29

Diels–Alder Reaction: Characteristics of Dienes

4.5K
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.
Characteristics of the diene
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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Diazonium Group Substitution: –OH and –H01:19

Diazonium Group Substitution: –OH and –H

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Nitrous acid, a weak acid, is prepared in situ via the reaction of sodium nitrite with a strong acid under cold conditions. This nitrous acid prepared in situ reacts with primary arylamines to form arenediazonium salts. Such reactions are known as diazotization reactions. As shown in Figure 1, the formation of arenediazonium salts begins with the decomposition of nitrous acid in an acidic solution to give nitrosonium ions.
2.9K
Preparation of 1° Amines: Hofmann and Curtius Rearrangement Overview01:07

Preparation of 1° Amines: Hofmann and Curtius Rearrangement Overview

3.3K
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.
3.3K
Stability of Conjugated Dienes01:28

Stability of Conjugated Dienes

3.8K
Introduction
A comparison of the enthalpies of hydrogenation of dienes reveals that conjugated dienes release less heat on hydrogenation, rendering them more stable than their nonconjugated analogs.
3.8K
1° Amines to Diazonium or Aryldiazonium Salts: Diazotization with NaNO2 Mechanism01:37

1° Amines to Diazonium or Aryldiazonium Salts: Diazotization with NaNO2 Mechanism

4.1K
Nitrous acid is a relatively weak and unstable acid prepared in situ by the reaction of sodium nitrite and cold, dilute hydrochloric acid. In an acidic solution, the nitrous acid undergoes protonation when it loses water to form a nitrosonium ion—an electrophile. Nitrous acid reacts with primary amines to give diazonium salts. The reaction is called diazotization of primary amines.
4.1K
Preparation of Amides01:29

Preparation of Amides

3.3K
Amides are synthesized by treating carboxylic acids with amines in the presence of dehydrating agents like dicyclohexylcarbodiimide (DCC).
The DCC-promoted synthesis of amides begins with the protonation of DCC by carboxylic acid. The protonation makes it a better acceptor. Next, the addition of carboxylate to the protonated carbodiimide gives a reactive acylating agent.
Subsequently, the amine acts as a nucleophile that attacks the acylating agent to form a tetrahedral intermediate. In the...
3.3K

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Synthesis and Purification of Iodoaziridines Involving Quantitative Selection of the Optimal Stationary Phase for Chromatography
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Diindolylamine Preparation and Stability Investigations.

Geneviève N Boice1, Brian O Patrick2, Robin G Hicks1

  • 1Department of Chemistry, University of Victoria, Victoria, BC V8W2Y2, Canada.

ACS Omega
|February 21, 2022
PubMed
Summary
This summary is machine-generated.

Researchers developed an efficient palladium-catalyzed method for synthesizing diindolylamines. Protecting the 3-position with a tert-butyl group enhances stability, preventing oxidative oligomerization and improving synthetic access to functionalized indoles.

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Area of Science:

  • Organic Chemistry
  • Catalysis
  • Materials Science

Background:

  • Diindolylamines are valuable heterocyclic compounds with potential applications in various fields.
  • Previous synthetic routes often suffer from low yields or harsh conditions.
  • The stability of diindolylamines under ambient conditions has been a significant challenge.

Purpose of the Study:

  • To investigate and optimize palladium-catalyzed cross-coupling for diindolylamine synthesis.
  • To address the instability issues associated with diindolylamine compounds.
  • To develop a reliable method for accessing functionalized diindolylamines.

Main Methods:

  • Palladium-catalyzed cross-coupling reaction between aminoindoles and bromoindoles.
  • Optimization of reaction conditions using BrettPhos, Pd(OAc)2, K2CO3, and tBuOH.
  • Introduction of a tert-butyl group at the 3-position of bromoindoles to enhance stability.
  • Characterization using Nuclear Magnetic Resonance (NMR), Cyclic Voltammetry (CV), and UV-Vis spectroscopy.

Main Results:

  • Efficient synthesis of diindolylamines achieved under optimized palladium-catalyzed cross-coupling conditions.
  • Diindolylamines were found to be unstable under ambient conditions, prone to oxidative oligomerization.
  • Incorporation of a tert-butyl group at the 3-position significantly improved the air stability of the diindolylamine.
  • A literature method for 3-tert-butylindole synthesis unexpectedly yielded an indole tetramer due to water presence.
  • Using tert-butyl chloride (tBuCl) instead of tert-butyl alcohol (tBuOH) circumvented tetramer formation and provided access to 7-bromo-3-tert-butyl indole.

Conclusions:

  • Palladium-catalyzed cross-coupling offers an efficient route to diindolylamines.
  • The instability of diindolylamines can be mitigated by steric protection at the 3-position.
  • Careful control of reaction conditions, including reagent choice and water exclusion, is crucial for indole synthesis.
  • This study provides a stable synthetic approach to functionalized diindolylamines and related indole derivatives.