Nickel(0)-Mediated Sequential Addition of Carbon Dioxide and Aryl Aldehydes into Terminal Allenes

Abstract
Nickel-mediated sequential addition of carbon dioxide and aryl aldehydes into terminal allenes is reported. The reaction proceeded in a diastereoselective manner to afford α-methylene-γ-hydroxy carboxylic acids, which allowed stereoselective preparation of cis-β,γ-disubstituted α-methylene-γ-lactones.