One-step assembly of a MacMillan catalyst-based phenolic-type polymer.

Area of Science:

• Organic Chemistry
• Polymer Science
• Catalysis

Background:

• Homogeneous organocatalysts offer high activity and selectivity but pose challenges in separation and recycling.
• Developing recyclable catalytic systems is crucial for sustainable chemical synthesis.

Purpose of the Study:

• To develop a novel polymeric organocatalyst with both high catalytic efficiency and facile recyclability.
• To investigate the catalytic performance of the new polymer in asymmetric reactions.

Main Methods:

• A "bottom-up" approach was used for the one-step synthesis of a MacMillan catalyst-based phenolic-type polymer (Mac-CP).
• The solubility properties of Mac-CP (soluble in acetonitrile, insoluble in hexane) were leveraged for catalyst separation.
• The catalytic activity and enantioselectivity of Mac-CP were evaluated in the asymmetric Diels-Alder reaction.

Main Results:

• The synthesized Mac-CP polymer features homogeneously distributed and highly concentrated catalytic sites.
• Mac-CP demonstrated comparable catalytic activity and enantioselectivity to its homogeneous counterpart in the asymmetric Diels-Alder reaction.
• Achieved 95% yield with 93% enantiomeric excess (ee) for the *endo* product and 92% ee for the *exo* product.

Conclusions:

• The developed Mac-CP polymer serves as an efficient organocatalyst for homogeneous applications.
• The unique solubility profile of Mac-CP enables straightforward heterogeneous recycling, enhancing sustainability.
• This work presents a promising strategy for designing recyclable polymer-based organocatalysts.