Divergent access to 5,6,7-perifused cycles

Area of Science:

• Organic Chemistry
• Catalysis
• Medicinal Chemistry

Background:

• Nitrogen-containing heterocycles are crucial building blocks in pharmaceuticals and functional materials.
• Efficient synthesis of complex heterocyclic scaffolds remains a significant challenge in organic chemistry.

Purpose of the Study:

• To develop a novel transition metal-catalyzed reaction for synthesizing structurally unique N-center 5,6,7-perifused cycles (NCPCs).
• To explore the versatility of the developed protocol for late-stage modification of complex molecules.

Main Methods:

• A high-order reaction sequence involving transition metal catalysis.
• Utilized 8π electrocyclization of alkenes and aromatic heterocycles to form a seven-membered ring.
• Generated metal carbene species to induce α-C-H or -C-C bond cleavage, followed by nucleophilic addition.

Main Results:

• Successfully synthesized a unique N-center 5,6,7-perifused cycle (NCPC) scaffold.
• Demonstrated the reaction's compatibility with various nucleophilic reagents (-O, -S, -N, -C).
• Showcased the protocol's utility through stereo-controlled late-stage modification of complex pharmaceuticals.

Conclusions:

• The developed transition metal-catalyzed reaction provides an efficient route to novel NCPCs.
• The protocol exhibits broad substrate scope and functional group tolerance.
• This method offers a versatile tool for the synthesis and modification of nitrogen-containing heterocycles in drug discovery and materials science.