Acidic Co-Catalysts in Cationic Gold Catalysis.

Area of Science:

• Organic Chemistry
• Catalysis
• Organometallic Chemistry

Background:

• Gold catalysis is a powerful tool in organic synthesis.
• Optimizing catalyst efficiency and reaction rates is crucial for practical applications.
• The role of co-catalysts in gold-catalyzed reactions requires further elucidation.

Purpose of the Study:

• To systematically investigate the impact of Lewis and Brønsted acid co-catalysts on gold-catalyzed reactions.
• To determine if acidic co-catalysts can enhance catalyst turnover and reaction rates.
• To establish practical catalyst loadings for gold-catalyzed transformations.

Main Methods:

• Conducted a systematic study using gold-catalyzed reactions.
• Employed representative reactions including O-, N-, and C-nucleophilic additions to alkynes.
• Varied the use of Lewis or Brønsted acid co-catalysts.

Main Results:

• Demonstrated that acidic co-catalysts significantly increase catalyst turnover.
• Achieved practical reaction rates at competitive catalyst loadings below 1 mol%.
• Identified a synergistic effect between gold catalysts and acidic co-catalysts.

Conclusions:

• Lewis and Brønsted acid co-catalysts are effective in enhancing gold-catalyzed reactions.
• Acidic co-catalysis enables efficient gold catalysis at low loadings.
• Further research is needed to fully understand the mechanistic principles.