Synthesis of (+)-cortistatin A

Area of Science:

• Marine natural products chemistry
• Organic synthesis
• Medicinal chemistry

Background:

• Cortistatin A is a marine steroid exhibiting selective antiangiogenic activity.
• Its unique structure presents synthetic challenges and opportunities for medicinal exploration.

Purpose of the Study:

• To develop an efficient and practical synthesis of Cortistatin A.
• To create a key intermediate, cortistatinone, for investigating the cortistatin pharmacophore.

Main Methods:

• The synthesis utilizes a terrestrial steroid as a starting material.
• Key steps include directed geminal C-H bisoxidation, a novel fragmentation cascade, chemoselective cyclization, and selective hydrogenation.

Main Results:

• A novel synthetic route to Cortistatin A was established.
• Unique chemical reactivities, including geminal C-H bisoxidation and a fragmentation cascade, were demonstrated.
• The synthesis provides a practical method for accessing cortistatin analogues.

Conclusions:

• The developed synthesis is brief, efficient, and practical, facilitating further research.
• This work enables the evaluation of the medicinal potential of cortistatin steroids.
• The synthetic methodology is applicable to future cortistatin syntheses and analogue development.