Construction of a Pentacyclic Framework Enabled by Nickel Catalysis.

Area of Science:

• Organic Chemistry
• Medicinal Chemistry
• Catalysis

Background:

• Indole derivatives are crucial scaffolds in medicinal chemistry.
• Developing efficient synthetic routes to complex heterocyclic compounds is a key challenge.
• Novel anticancer agents are urgently needed.

Purpose of the Study:

• To develop a novel synthetic strategy for pentacyclic benzofurocyclohepta[b]indole derivatives.
• To explore the anticancer potential of these newly synthesized compounds.

Main Methods:

• Nickel-catalyzed reaction of indole-tethered 2-alkynylphenol esters with (hetero)aryl boronic acids.
• Cascade reaction involving arylative cyclization, nucleophilic attack, alkyl group migration, and aromatization.

Main Results:

• Successfully synthesized diversely functionalized pentacyclic benzofurocyclohepta[b]indole derivatives.
• The synthesized compounds demonstrated exceptional cytotoxicity against various cancer cell lines.
• Biocompatibility was maintained towards healthy cells.

Conclusions:

• The developed nickel-catalyzed cascade reaction provides an efficient route to novel pentacyclic indole derivatives.
• These compounds represent promising candidates for anticancer drug development.