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Asymmetric synthesis of (+)-negamycin
Rajendra P Jain1, Robert M Williams
1Department of Chemistry, Colorado State University, Fort Collins, Colorado 80523, USA.
The Journal of Organic Chemistry
|August 31, 2002
Summary
Researchers developed an asymmetric synthesis for the antibiotic (+)-negamycin. This novel route utilizes Wittig olefination and asymmetric hydrogenation for efficient production of this complex molecule.
Area of Science:
- Organic Chemistry
- Medicinal Chemistry
- Synthetic Chemistry
Background:
- (+)-Negamycin is a biologically active antibiotic.
- Efficient and stereoselective synthesis of complex natural products is crucial for drug discovery.
Purpose of the Study:
- To achieve an asymmetric synthesis of the antibiotic (+)-negamycin.
- To establish a scalable and efficient synthetic route.
Main Methods:
- The synthesis commenced with a commercially available oxazinone derivative.
- Key steps included stabilized Wittig olefination, asymmetric hydrogenation, and chelation-controlled allylation.
- The route involved 11 steps with a focus on diastereoselectivity.
Main Results:
- An all-syn oxazine intermediate was generated with excellent diastereoselectivity.
- A homoallylamine intermediate was obtained with good diastereoselectivity.
- The total synthesis of (+)-negamycin was accomplished in 25% overall yield.
Conclusions:
- An effective asymmetric synthesis of (+)-negamycin has been successfully developed.
- The synthetic strategy highlights the utility of Wittig olefination and asymmetric hydrogenation in complex molecule synthesis.
- This pathway provides a viable route for accessing the antibiotic (+)-negamycin.