Cu(I)-Catalyzed Atropselective Heterobiaryl Coupling Employing Umpoled Indoles.

Area of Science:

• Organic Chemistry
• Catalysis
• Asymmetric Synthesis

Background:

• Axially chiral arylindoles are important structural motifs in medicinal chemistry and materials science.
• Developing efficient and enantioselective methods for their synthesis remains a significant challenge.

Purpose of the Study:

• To develop a novel enantioselective catalytic method for synthesizing axially chiral arylindoles.
• To explore the scope and mechanism of the developed reaction.

Main Methods:

• Copper(I)-catalyzed coupling reaction between N-carboxyindoles and 2-naphthols/phenols.
• Mechanistic investigations using experimental evidence and Density Functional Theory (DFT) calculations.

Main Results:

• Successful development of an enantioselective Cu(I)-catalyzed coupling reaction.
• Unprecedented diversity in the use of 2-naphthols and phenols for C-H arylation.
• Elucidation of a novel closed-shell mechanism involving outer-sphere attack.
• Achieved enantiocontrol via center-to-axis chirality transfer, preventing epimerization.

Conclusions:

• The developed method provides a versatile route to diverse axially chiral arylindoles.
• The novel mechanism offers insights into asymmetric catalysis and C-H functionalization.
• This work expands the synthetic toolbox for accessing valuable chiral compounds.