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Efficient Construction of Drug-like Bispirocyclic Scaffolds Via Organocatalytic Cycloadditions of α-Imino γ-Lactones and Alkylidene Pyrazolones
Published on: February 7, 2019
Silylmethyl-substituted cyclopropyl and other strained ring systems: cycloaddition with dipolarophiles
Divya Agrawal1, Veejendra K Yadav
1Department of Chemistry, Indian Institute of Technology, Kanpur 208016, India.
Small ring compounds, like cyclopropanes and aziridines, undergo controlled cycloaddition reactions. These reactions, facilitated by Lewis acids and featuring silylmethyl groups, offer versatile synthetic applications.
Area of Science:
- Organic Chemistry
- Synthetic Chemistry
Background:
- Small ring compounds (three- and four-membered) are valuable in organic synthesis.
- Cyclopropanes, aziridines, and azetidines are key examples of small ring systems.
- Vicinal substitution with electron-donor and electron-acceptor groups influences reactivity.
Purpose of the Study:
- To provide an overview of cycloaddition reactions involving silylmethyl-substituted small ring compounds.
- To explore the regioselectivity and stereoselectivity of these reactions.
- To discuss potential synthetic applications of these transformations.
Main Methods:
- Lewis acid-catalyzed cycloaddition reactions.
- Utilizing silylmethyl-substituted small ring compounds as substrates.
- Employing various dipolarophiles in the cycloaddition reactions.
Main Results:
- Regio- and stereocontrolled cycloaddition of substituted cyclopropanes, aziridines, and azetidines.
- Demonstration of the utility of the trialkylsilylmethyl donor substituent.
- Overview of diverse cycloaddition outcomes with different dipolarophiles.
Conclusions:
- Silylmethyl-substituted small ring compounds are effective building blocks in organic synthesis.
- Lewis acid-assisted cycloadditions offer precise control over regio- and stereochemistry.
- These reactions present significant potential for constructing complex molecules.
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