Creation of Diversity in Polyquinane Synthesis Involving Metathesis as a Key Step.

Area of Science:

• Organic Chemistry
• Synthetic Chemistry
• Natural Product Synthesis

Background:

• Polyquinanes feature fused five-membered rings and are vital in biologically significant natural products.
• Norbornene derivatives offer unique reactivity for constructing complex molecular architectures.

Purpose of the Study:

• To highlight the synthesis of diverse polyquinane scaffolds using norbornene derivatives and olefin metathesis (OM).
• To showcase the construction of complex polyquinanes, including tetra- and pentaquinanes, with precise stereochemistry.

Main Methods:

• Employing advanced olefin metathesis (OM) strategies, including ring-opening (ROM), ring-closing (RCM), and ring-rearrangement (RRM) metathesis.
• Utilizing norbornene derivatives and Diels-Alder adducts (DAA) as key building blocks.
• Combining metathesis with Diels-Alder reactions (DAR) for synergistic effects in complex molecule assembly.

Main Results:

• Efficient construction of diverse polyquinane architectures (linear, angular, propellane, tetra-, and pentaquinanes).
• Successful assembly of cis-anti-cis and cis-syn-cis stereochemical motifs.
• Overcoming challenges related to strained ring systems and regioselectivity.

Conclusions:

• Olefin metathesis strategies, particularly with norbornene derivatives, provide powerful tools for synthesizing complex polyquinanes.
• These methods facilitate access to natural products and their analogs with intricate stereochemistry.
• The study underscores the expanded role of OM in modern organic synthesis and drug discovery.