Double A³ -Coupling of Primary Amines Catalysed by Gold Complexes

Area of Science:

• Organic Chemistry
• Catalysis
• Synthetic Methodology

Background:

• Dipropargylamines are valuable synthetic intermediates.
• Efficient synthetic routes are crucial for accessing complex organic molecules.
• Gold catalysis has emerged as a powerful tool in organic synthesis.

Purpose of the Study:

• To develop a novel one-pot, five-component synthesis of dipropargylamines.
• To investigate the catalytic activity of cationic gold(I) complexes in this transformation.
• To elucidate the reaction mechanism using various analytical techniques.

Main Methods:

• Five-component A³-coupling reaction.
• Catalysis using cationic [AuI-L][SbF₆] complexes (L=JohnPhos).
• Reaction monitoring via NMR, HRMS (ESI), and GC-MS.
• Isolation and characterization of catalytic intermediates by X-ray diffraction.

Main Results:

• Successful synthesis of a novel family of dipropargylamines in one pot.
• Identification of key intermediates and confirmation of π-gold(I) acetylide complexes as active species.
• Demonstration of solvent and base effects on reaction outcome and intermediate formation.

Conclusions:

• The developed double catalytic A³-coupling offers a convenient and efficient route to dipropargylamines.
• The mechanistic insights provide a deeper understanding of gold-catalyzed multicomponent reactions.
• The study highlights the versatility of gold catalysis in constructing complex molecular architectures.