Gold Redox Catalysis with a Selenium Cation as a Mild Oxidant

Area of Science:

• Organometallic Chemistry
• Catalysis
• Organic Synthesis

Background:

• Alkyne and allene functionalization are crucial in organic synthesis.
• Developing selective and efficient catalytic methods for diselenation remains a challenge.

Purpose of the Study:

• To develop novel gold-catalyzed methods for alkyne and allene diselenation.
• To investigate the reaction mechanism and explore substrate scope.

Main Methods:

• Utilized gold catalysts for diselenation reactions of alkynes and allenes.
• Performed mechanistic studies including intermediate identification and proposed a reaction pathway.
• Evaluated a wide range of substrates to determine reaction scope and limitations.

Main Results:

• Achieved excellent regioselectivity (trans) and good to excellent yields (up to 98%) for diselenation products.
• Demonstrated the method's effectiveness with a broad spectrum of substrates.
• Identified a key vinyl gold(I) intermediate and proposed a gold(I/III) redox process.

Conclusions:

• Successfully developed mild and efficient gold-catalyzed diselenation reactions for alkynes and allenes.
• The mechanistic insights suggest a novel gold(I/III) redox pathway.
• The developed methodology offers a valuable tool for synthesizing selenium-containing organic compounds.