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Rapid Extraction of Acid-Labile Compounds into an Aqueous Phase Using a Mixer-Settler under Continuous-Flow
Masahiro Hosoya1, Kengo Inoue1
1API R&D Laboratory, Pharmaceutical Technology Research Division, Shionogi & Co., Ltd., 3-1-1 Futaba-cho, Toyonaka, Osaka 561-0825, Japan.
Chemical & Pharmaceutical Bulletin
|June 14, 2026
Summary
A new continuous-flow extraction method rapidly isolates basic compounds. This process neutralizes acid-labile tert-butoxycarbonyl protected compounds before decomposition, aiding pharmaceutical purification.
Area of Science:
- Chemical Engineering
- Organic Chemistry
- Pharmaceutical Science
Background:
- Acidic conditions can cause decomposition of tert-butoxycarbonyl (Boc) protected basic compounds.
- Traditional extraction methods may not be efficient for handling labile intermediates.
- Continuous-flow processing offers advantages in reaction control and efficiency.
Purpose of the Study:
- To develop a rapid extraction methodology for basic compounds with acid-labile protecting groups.
- To implement continuous-flow conditions for improved extraction efficiency and compound stability.
- To assess the potential of this method for pharmaceutical intermediate purification.
Main Methods:
- Development of a continuous-flow extraction system utilizing a mixer-settler.
- Extraction of Boc-protected basic compounds into an acidic aqueous phase.
- In-line neutralization of the extracted compounds to prevent decomposition.
Main Results:
- Successful rapid extraction of Boc-protected basic compounds under continuous-flow conditions.
- Demonstrated prevention of compound decomposition through immediate neutralization.
- Achieved efficient separation of target compounds from impurities.
Conclusions:
- The developed continuous-flow extraction methodology is effective for handling acid-labile compounds.
- This approach offers a promising solution for purifying drug substances in pharmaceutical manufacturing.
- The method enhances process efficiency and preserves compound integrity.
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