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Protocol for the Synthesis of Ortho-trifluoromethoxylated Aniline Derivatives
Published on: January 19, 2016
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Environmentally Friendly Protocol for 2,3-Difunctionlization of Indole Derivatives
Wen-Wu Sun1, Na Chen1, Ting-Ting Wei1
1School of Pharmaceutical Sciences, South-Central University for Nationalities, Wuhan 430074, China.
The Journal of Organic Chemistry
|July 14, 2020
Summary
This study introduces an eco-friendly method for dichlorinating and oxidizing N-substituted indoles. The process efficiently yields 3,3-dichloro-2-oxindoles using simple reagents like sodium chloride and water.
Area of Science:
- Organic Chemistry
- Green Chemistry
- Synthetic Methodology
Background:
- N-substituted indoles are crucial scaffolds in medicinal chemistry.
- Efficient synthesis of indole derivatives is essential for drug discovery.
- Existing methods for indole functionalization often involve harsh reagents or multiple steps.
Purpose of the Study:
- To develop a green and regioselective method for C-3 dichlorination and C-2 oxidation of N-substituted indoles.
- To synthesize 3,3-dichloro-2-oxindoles efficiently.
- To explore the scalability and derivatization potential of the new method.
Main Methods:
- Utilized sodium chloride (NaCl) as a sustainable chlorine source.
- Employed water (H2O) as an environmentally benign oxygen source.
- Investigated the reaction mechanism for the transformation.
Main Results:
- Achieved highly regioselective C-3 dichlorination and C-2 oxidation.
- Synthesized a series of 3,3-dichloro-2-oxindoles in moderate to excellent yields.
- Demonstrated the feasibility of gram-scale synthesis and subsequent derivatization.
Conclusions:
- The developed method offers an environmentally friendly and efficient route to valuable 3,3-dichloro-2-oxindole derivatives.
- The use of NaCl and H2O aligns with green chemistry principles.
- The reaction provides a versatile platform for further synthetic elaborations.
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