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Synthesis of HKI 0231B
1E. F. Merkert Chemistry Center, Boston College, Chestnut Hill, Massachusetts 02467, USA.
The Journal of Organic Chemistry
|November 19, 2005
Summary
The total synthesis of HKI 0231B was achieved using a 12-step process. Key steps included an anionic cyclization to form the benz[cd]indol-3-(1H)-one core and directed ortho-lithiation for final functionalization.
Area of Science:
- Organic Synthesis
- Medicinal Chemistry
Background:
- HKI 0231B is a complex molecule with potential biological significance.
- The benz[cd]indol-3-(1H)-one scaffold is a challenging synthetic target.
Purpose of the Study:
- To achieve the total synthesis of HKI 0231B.
- To explore novel synthetic methodologies for constructing the benz[cd]indol-3-(1H)-one ring system.
- To investigate the reactivity of lactam acetal functionalities.
Main Methods:
- A 12-step linear synthesis was employed.
- An unusual anionic cyclization was utilized to construct the core structure.
- Directed ortho-lithiation followed by formylation and acid-catalyzed methanolysis were key steps.
Main Results:
- The total synthesis of HKI 0231B was successfully completed in 12 steps with a 15.6% overall yield.
- The benz[cd]indol-3-(1H)-one ring system was efficiently accessed.
- Studies on the lactam acetal functionality of HKI 0231A were also reported.
Conclusions:
- The developed synthetic route provides a viable pathway to HKI 0231B.
- The study highlights the utility of anionic cyclization and directed ortho-lithiation in complex molecule synthesis.
- Further investigations into related structures and functionalities are warranted.