Thiophene-Alkyne-Based CMPs as Highly Selective Regulators for Oxidative Heck Reaction

Area of Science:

• Organic Chemistry
• Materials Science
• Catalysis

Background:

• Palladium-catalyzed reactions are crucial in organic synthesis.
• Developing novel ligands and catalytic materials is essential for improving reaction selectivity and efficiency.
• Conjugated microporous polymers (CMPs) offer unique structural properties for catalytic applications.

Purpose of the Study:

• To introduce thiophenes with adjacent C≡C groups as novel ligands for Pd(II)-promoted reactions.
• To integrate these ligands into CMPs for use as heterogeneous catalysts.
• To investigate the application of these CMP materials in selective oxidative Heck reactions.

Main Methods:

• Synthesis of thiophene-based ligands featuring an adjacent alkyne (C≡C) group.
• Incorporation of these ligands into the framework of conjugated microporous polymers (CMPs).
• Application of the resulting CMP materials as catalysts in oxidative Heck reactions between arylboronic esters and alkenes.

Main Results:

• The novel thiophene-alkyne ligands were successfully synthesized and incorporated into CMPs.
• The CMP materials demonstrated high selectivity in catalyzing oxidative Heck reactions.
• Highly linear products were selectively obtained from arylboronic esters and electronically unbiased alkenes.

Conclusions:

• Thiophene-alkyne ligands represent a new class of ligands for Pd(II)-catalyzed organic reactions.
• CMPs functionalized with these ligands serve as effective and selective heterogeneous catalysts.
• This work provides a novel strategy for the synthesis of highly selective linear products via oxidative Heck reactions.