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Updated: Mar 23, 2026
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Continuous Flow Chemistry: Reaction of Diphenyldiazomethane with p-Nitrobenzoic Acid
Published on: November 15, 2017
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High-Temperature Boc Deprotection in Flow and Its Application in Multistep Reaction Sequences
Andrew R Bogdan1, Manwika Charaschanya2, Amanda W Dombrowski1
1Discovery Chemistry and Technologies, AbbVie, Inc., 1 North Waukegan Road, North Chicago, Illinois 60064, United States.
Organic Letters
|April 6, 2016
Summary
A novel flow reactor simplifies Boc deprotection in minutes using acetonitrile without acid. This method enables efficient, multi-step synthesis with no intermediate isolation, streamlining chemical processes.
Area of Science:
- Organic Chemistry
- Chemical Engineering
- Process Chemistry
Background:
- tert-Butoxycarbonyl (Boc) protecting groups are widely used in organic synthesis.
- Traditional Boc deprotection methods often require harsh acidic conditions and extensive workup procedures.
- Developing milder, more efficient deprotection strategies is crucial for complex molecule synthesis.
Purpose of the Study:
- To develop a simplified and efficient method for Boc deprotection.
- To demonstrate the utility of high-temperature flow chemistry for deprotection reactions.
- To showcase the feasibility of integrated, multi-step reaction sequences in flow.
Main Methods:
- Utilized a high-temperature flow reactor for Boc deprotection.
- Employed acetonitrile as the solvent.
- Investigated the deprotection of a diverse range of Boc-protected substrates.
- Demonstrated sequential, multi-step reactions without intermediate isolation.
Main Results:
- Achieved qualitative yields of deprotected products rapidly (within minutes).
- Successfully deprotected a wide variety of substrates.
- Eliminated the need for acidic conditions and additional workup steps.
- Demonstrated highly efficient, telescoped reaction sequences in flow.
Conclusions:
- The described flow system offers a simplified, rapid, and versatile method for Boc deprotection.
- High-temperature flow chemistry provides a powerful platform for efficient and streamlined organic synthesis.
- This approach minimizes waste and simplifies purification, making it attractive for various synthetic applications.
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