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Syntheses, Crystallization, and Spectroscopic Characterization of 3,5-Lutidine N-Oxide Dehydrate
Published on: April 24, 2018
Synthesis of (±)-7-hydroxylycopodine.
Hong-Yu Lin1, Robert Causey, Gregory E Garcia
1Department of Chemistry MS 015, Brandeis University, Waltham, Massachusetts 02454-9110, USA.
This study presents a seven-step synthesis of (±)-7-hydroxylycopodine, achieving a key tricyclic intermediate via a stereoselective Prins reaction. Novel oxidation reactions were also observed during attempts to create dihydroxylated analogs.
Area of Science:
- Organic Synthesis
- Natural Product Chemistry
- Stereochemistry
Background:
- Lycopocine alkaloids are a class of natural products with complex structures.
- Developing efficient synthetic routes to these alkaloids is crucial for chemical biology and medicinal chemistry.
- Stereocontrolled synthesis of polycyclic alkaloids presents significant challenges.
Purpose of the Study:
- To achieve a concise synthesis of (±)-7-hydroxylycopodine.
- To explore novel chemical transformations relevant to alkaloid synthesis.
- To investigate stereochemical control in key synthetic steps.
Main Methods:
- A seven-step synthetic sequence was employed.
- A key Prins reaction in 60% sulfuric acid was utilized for tricyclic intermediate formation.
- Orthogonal protection strategies and oxidation reactions were performed.
Main Results:
- The synthesis of (±)-7-hydroxylycopodine was accomplished in 5% overall yield.
- The Prins reaction provided complete control over ring fusion stereochemistry.
- Novel Pt-catalyzed reactions and Mn(OAc)3/KHMDS oxidations were observed.
Conclusions:
- A viable synthetic route to (±)-7-hydroxylycopodine has been established.
- The study highlights the utility of the Prins reaction in complex alkaloid synthesis.
- New oxidative transformations were discovered, expanding synthetic methodologies.
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