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Preparation of Stable Bicyclic Aziridinium Ions and Their Ring-Opening for the Synthesis of Azaheterocycles
Published on: August 22, 2018
Single Step Synthesis of Non-symmetric Azoarenes Using Buchwald-Hartwig Amination
Martin Kocúrik1, Pavlína Konopáčová1, Lukáš Kolman1
1Institute of Organic Chemistry and Technology, Faculty of Chemical Technology, University of Pardubice, Studentská 573, Pardubice 53210, The Czech Republic.
This study presents a one-step synthesis for nonsymmetrical azoarenes using Buchwald-Hartwig amination and atmospheric oxygen. This versatile method offers high yields and broad substrate compatibility, overcoming common synthetic challenges.
Area of Science:
- Organic Chemistry
- Synthetic Chemistry
- Catalysis
Background:
- Aromatic azo compounds are valuable but challenging to synthesize.
- Existing methods often require multiple steps or are substrate-specific.
Purpose of the Study:
- To develop a universal, one-step synthesis for nonsymmetrical azoarenes.
- To investigate the mechanistic aspects of this novel synthetic approach.
Main Methods:
- Buchwald-Hartwig amination of (pseudo)haloaromatics with arylhydrazines.
- Utilized atmospheric oxygen as an oxidant.
- Employed BINAP as a key ligand.
Main Results:
- Achieved up to 85% yield for nonsymmetrical azoarenes.
- Demonstrated broad substrate compatibility and adaptability.
- Provided experimental and computational mechanistic insights.
Conclusions:
- A highly versatile and efficient one-step method for synthesizing nonsymmetrical azoarenes has been established.
- The reaction's mechanism, particularly the role of the BINAP ligand, was elucidated.
- This approach offers a significant advancement in aromatic azo compound synthesis.
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