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Related Concept Videos

Structure of Amines01:19

Structure of Amines

2.5K
The hybridized nitrogen atom in amines possesses a lone pair of electrons and is bound to three substituents with a bond angle of around 108°, which is less than the tetrahedral angle of 109.5°. However, the C–N–H bond angle is slightly larger at 112°, with a carbon–nitrogen bond length of 147 pm. This carbon–nitrogen bond length of of amines is longer than the carbon–oxygen bond of alcohols (143 pm) but shorter than alkanes’...
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Preparation of Amines: Reductive Amination of Aldehydes and Ketones01:38

Preparation of Amines: Reductive Amination of Aldehydes and Ketones

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Carbonyl compounds and primary amines undergo reductive amination first to produce imines, followed by secondary amines in the same reaction mixture, using selective reducing agents like sodium cyanoborohydride or sodium triacetoxyborohydride. Reductive amination produces different degrees of substitution of amines depending on the starting amine substrate.
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Aldehydes and Ketones with Amines: Imine and Enamine Formation Overview01:16

Aldehydes and Ketones with Amines: Imine and Enamine Formation Overview

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Primary amines react with carbonyl compounds—aldehydes and ketones—to generate imines. Imines consist of a C=N double bond and are named Schiff bases after its discoverer—the German chemist Hugo Schiff. On the other hand, secondary amines react with carbonyl compounds to give enamines. In enamines, the presence of a C=C double bond adjacent to the nitrogen atom leads to the delocalization of the lone pair.
4.8K
Acid Halides to Amides: Aminolysis01:07

Acid Halides to Amides: Aminolysis

2.8K
Aminolysis is a nucleophilic acyl substitution reaction, where ammonia or amines act as nucleophiles to give the substitution product. Acid halides react with ammonia, primary amines, and secondary amines to yield primary, secondary, and tertiary amides, respectively.
In the first step of the aminolysis mechanism, the amine attacks the carbonyl carbon of the acyl chloride to form a tetrahedral intermediate. In the second step, the carbonyl group is re-formed with the elimination of a chloride...
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Preparation of 1° Amines: Gabriel Synthesis01:28

Preparation of 1° Amines: Gabriel Synthesis

3.6K
Direct alkylation is not a suitable method for synthesizing amines because it produces polyalkylated products. Gabriel synthesis is the most preferred method to exclusively make primary amines. The method uses phthalimide, which contains a protected form of nitrogen that participates in alkylation only once to predominantly give primary amines.
Strong bases like NaOH or KOH deprotonate the phthalimide to form the corresponding anion, which acts as a nucleophile. Further, the anion attacks an...
3.6K
Preparation of 1° Amines: Hofmann and Curtius Rearrangement Mechanism01:26

Preparation of 1° Amines: Hofmann and Curtius Rearrangement Mechanism

3.5K
The Hofmann and Curtius rearrangement reactions can be applied to synthesize primary amines from carboxylic acid derivatives such as amides and acyl azides. In the Hofmann rearrangement, a primary amide undergoes deprotonation in the presence of a base, followed by halogenation to generate an N-haloamide. A second proton abstraction produces a stabilized anionic species, which rearranges to an isocyanate intermediate via an alkyl group migration from the carbonyl carbon to the neighboring...
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Advancing Meta-Selective C-H Amination through Non-Covalent Interactions.

Qianqian Lv1, Zongxing Hu1, Yousong Zhang1

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|December 14, 2023
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Summary

Researchers achieved meta-C-H amination of arenes using pharmaceutical functional groups. This method bypasses the need for extra directing groups, enabling efficient drug synthesis and modification.

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Area of Science:

  • Organic Chemistry
  • Medicinal Chemistry

Background:

  • Regioselective C-H amination is crucial for synthesizing complex organic molecules.
  • Directing meta-C-H functionalization of arenes remains a significant synthetic challenge due to inherent electronic and steric properties.

Purpose of the Study:

  • To develop a novel method for regioselective meta-C-H amination of arenes.
  • To overcome limitations of existing C-H functionalization techniques by avoiding auxiliary directing groups.

Main Methods:

  • Utilized privileged nitrogen-containing functionalities present in pharmaceutical compounds as intrinsic directing groups.
  • Discovered a novel organo-initiator to facilitate the reaction.
  • Employed non-covalent interactions for enhanced regiochemical control.

Main Results:

  • Achieved high regioselectivity in meta-C-H amination of various arenes.
  • Demonstrated broad functional group tolerance, accommodating diverse pharmaceutical motifs.
  • Successfully applied the protocol for concise synthesis and late-stage derivatization of drug molecules.

Conclusions:

  • The developed protocol offers a powerful and versatile strategy for meta-C-H amination.
  • This approach simplifies synthetic routes and enables efficient modification of drug candidates.
  • The method holds significant potential for pharmaceutical research and development.