Modular solid-phase synthesis, catalytic application and efficient recycling of supported phosphine-phosphite ligand...

Area of Science:

• Catalysis
• Organic Synthesis
• Materials Science

Background:

• Homogeneous asymmetric catalysis discovery often relies on trial-and-error.
• Efficient methods for synthesizing and screening large ligand libraries, particularly bidentate phosphorus ligands, are lacking.

Purpose of the Study:

• To develop a modular solid-phase synthetic approach for creating libraries of phosphine-phosphite ligands.
• To apply these ligands in rhodium-catalyzed asymmetric hydrogenation and evaluate their performance and recyclability.

Main Methods:

• A highly modular solid-phase synthesis was employed to generate libraries of phosphine-phosphite ligands.
• The synthesized polymer-supported ligands were utilized in rhodium-catalyzed asymmetric hydrogenation reactions.
• Recyclability of the supported ligands was assessed under batch conditions.

Main Results:

• The solid-phase synthesis provided facile access to phosphine-phosphite ligand libraries in quantitative yield with minimal work-up.
• The supported ligands achieved high enantioselectivities, up to 98%, in asymmetric hydrogenation.
• The polymer-supported ligands demonstrated good recyclability with only a small decline in activity and no loss of selectivity.

Conclusions:

• The developed solid-phase approach offers an efficient route to diverse phosphine-phosphite ligand libraries.
• These recyclable supported ligands are effective for high-performance asymmetric hydrogenation.
• This method overcomes limitations in combinatorial synthesis for catalyst discovery.