Diversity-oriented synthesis of 17-spirosteroids

Area of Science:

• Organic Chemistry
• Synthetic Chemistry
• Medicinal Chemistry

Background:

• Steroids are crucial in medicine, but their complex structures pose synthetic challenges.
• Developing efficient methods to create novel steroid derivatives is vital for drug discovery.
• Existing synthetic routes often lack efficiency and diversity.

Purpose of the Study:

• To develop a novel, efficient, and versatile synthetic strategy for complex steroid derivatives.
• To functionalize 17-ethynyl-17-hydroxysteroids using a diversity-oriented synthesis approach.
• To explore the application of this strategy to commercially available steroids like mestranol and lynestrenol.

Main Methods:

• A one-pot procedure combining ring-closing enyne metathesis (RCEYM) and Diels-Alder reactions.
• Utilizing microwave irradiation to accelerate the reaction rates and improve yields.
• Employing the propargyl alcohol moiety present in steroids as a key functional handle.

Main Results:

• Successful synthesis of a diverse library of complex 17-spirosteroids.
• Demonstrated the applicability of the DOS approach to mestranol and lynestrenol.
• The one-pot RCEYM-Diels-Alder sequence proved efficient under microwave conditions.

Conclusions:

• The developed DOS strategy offers a powerful route to novel spirosteroid scaffolds.
• This method provides access to complex steroid architectures with potential pharmaceutical applications.
• The strategy is versatile and applicable to various commercially available steroid starting materials.