Total synthesis of (±)-cyclopeltain B

Area of Science:

• Organic Chemistry
• Synthetic Chemistry
• Medicinal Chemistry

Background:

• Cyclopeltain B is a unique alkylated adenine derivative.
• It features a rare 6/5/7/5 fused ring system.
• Its biological activities and synthetic pathways are not well understood.

Purpose of the Study:

• To report the first total synthesis of (±)-cyclopeltain B.
• To establish a synthetic route for constructing the complex 6/5/7/5 fused ring scaffold.
• To synthesize analogues for biological activity evaluation.

Main Methods:

• Total synthesis of (±)-cyclopeltain B from adenine and (Z)-but-2-ene-1,4-diol.
• Utilized an aza-Michael addition followed by a TiCl4-mediated one-pot five-step cascade reaction.
• Structure confirmation via X-ray crystallography and spectral data comparison.

Main Results:

• Successful total synthesis of (±)-cyclopeltain B.
• Construction of the intricate 6/5/7/5 fused ring system.
• Confirmation of synthetic product structure matching the natural product.
• Synthesis of novel analogues for further biological studies.

Conclusions:

• The first total synthesis of (±)-cyclopeltain B was achieved.
• A novel synthetic strategy was developed for the complex fused ring system.
• The synthetic methodology provides a foundation for exploring cyclopeltain B analogues and their potential biological applications.