Bile acid-based cage compounds with lipophilic outer shells and inner cavities

Area of Science:

• Organic Chemistry
• Supramolecular Chemistry
• Steroid Chemistry

Background:

• Steroid-based molecules offer unique structural scaffolds.
• Cyclodimers represent complex cyclic architectures with potential applications.
• Functionalization of steroids is key to developing novel molecular structures.

Purpose of the Study:

• To synthesize and characterize novel steroid-based cyclodimers.
• To explore the application of ring-closing metathesis in creating complex cyclic structures.
• To investigate the structural features of the synthesized cyclodimers.

Main Methods:

• Synthesis of functionalized steroid precursor (4).
• Intramolecular ring-closing metathesis using Grubbs' catalyst to form cyclodimer 5.
• Full characterization of synthesized compounds, including crystal structure analysis.

Main Results:

• Successful synthesis and full characterization of steroid-based cyclodimers 4, cis-5, and trans-5.
• Cyclodimer 5 obtained with a cis-trans ratio of 3:1 via ring-closing metathesis.
• Crystal structure analysis revealed cis-5 as a cagelike cyclic oligomer with a flexible oct-4-enedioate bridge.

Conclusions:

• Novel steroid-based cyclodimers were successfully synthesized and characterized.
• Ring-closing metathesis is an effective method for constructing complex cagelike steroid cyclodimers.
• The characterized structures provide insights into steroid-based molecular architectures.