In the presence of a Cu(I)/NHC catalyst, the reactions of allylboronic pinacol esters with CO2 (1 atm) are highly regioselective, giving exclusively the more substituted β,γ-unsaturated carboxylic acids in most cases. A diverse array of substituted carboxylic acids can be prepared via this method, including compounds featuring all-carbon quaternary centers.

Regioselective Copper-Catalyzed Carboxylation of Allylboronates with Carbon Dioxide. -(DUONG*, H. A.; HULEATT, P. B.; TAN, Q.-W.; SHUYING, E. L.; Org. Lett. 15 (2013) 15, 4034-4037, http://dx.doi.org/10.1021/ol4019375 ; Agency Sci., Technol. Res., Inst. Chem. Eng. Sci., Singapore 138665, Singapore; Eng.) -U. Scheffler 50-055