Aryl Halide Carboxylation via Decarboxylative Metal–Halogen Exchange

Key findings from this study

• The authors report that potassium carboxylate salts function as both CO2 source and metalating agent in metal-halogen exchange with aryl halides.
• The study demonstrates carboxylation under mild conditions without pressurized equipment or strictly inert atmospheres.
• The researchers show that the methodology enables carbon isotope labeling of biologically relevant compounds, including late-stage transformations.

Overview

A decarboxylative metal-halogen exchange mechanism enables carboxylation of aryl halides using potassium carboxylate salts. The methodology avoids conventional organometallic reagents and pressurized equipment, operating instead under mild conditions with commercially available bench-stable precursors.

Methods and approach

The procedure employs potassium salts of carboxylic acids as dual-function reagents, simultaneously generating the metalating agent and CO2 in situ. Experimental investigations coupled with computational studies elucidated the proposed decarboxylative mechanism.

Results

The carboxylation demonstrates broad substrate scope across aromatic halide substrates while proceeding under mild conditions without requirement for specialized apparatus or strictly controlled inert environments. The authors applied the methodology to carbon isotope labeling of biologically relevant compounds, including late-stage carbon isotope exchange transformations. Experimental and computational evidence supports the mechanism in which both the metalating agent and CO2 arise from decomposition of the carboxylate salt precursor.

Implications

The use of bench-stable, readily available carboxylic acid salts as metalating agents represents a practical alternative to sensitive organometallic reagents in metal-halogen exchange chemistry. This advance reduces operational hazards and streamlines synthetic workflows by eliminating requirements for pressurized containers or stringent atmospheric control. The methodology's applicability to carbon-14 and carbon-13 labeling suggests utility in pharmaceutical development and mechanistic studies where isotopic modification is essential.

Scope and limitations

This summary is based on the study abstract and available metadata. It does not include a full analysis of the complete paper, supplementary materials, or underlying datasets unless explicitly stated. Findings should be interpreted in the context of the original publication.