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Solid-phase Synthesis of [4.4] Spirocyclic Oximes
Published on: February 6, 2019
Exploring a Ring-Closing Metathesis Approach to the Archazolid Macrocycle.
Brianne R King1, Steven M Swick1, Sara L Schaefer1
1Department of Chemistry, Western Washington University, Bellingham, WA 98225.
Researchers synthesized a novel dihydroarchazolid analogue domain and explored macrocyclization using ring-closing metathesis (RCM). A competing backbiting reaction was identified, potentially solvable with alcohol functionalization and a metathesis relay.
Area of Science:
- Organic Synthesis
- Medicinal Chemistry
Background:
- Dihydroarchazolid is a complex natural product with potential biological activity.
- The development of efficient synthetic routes to analogues is crucial for structure-activity relationship studies.
Purpose of the Study:
- To synthesize a key "eastern domain" fragment of a dihydroarchazolid analogue.
- To investigate the feasibility of macrocyclization using ring-closing metathesis (RCM).
- To identify and address challenges in the macrocyclization step.
Main Methods:
- Multi-step organic synthesis to construct the eastern domain.
- Application of RCM for macrocycle formation.
- Analysis of reaction pathways to understand competing processes.
Main Results:
- Successful synthesis of the target eastern domain.
- Attempted macrocyclization via RCM revealed a competing backbiting pathway.
- Identification of potential strategies, including alcohol functionalization and metathesis relay, to overcome the backbiting process.
Conclusions:
- The synthesis of the eastern domain is a significant step towards the total synthesis of dihydroarchazolid analogues.
- Understanding and mitigating the backbiting process are critical for successful macrocyclization.
- Proposed modifications offer promising avenues for future synthetic efforts.
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