Visible-Light-Mediated Dual Decarboxylative Coupling of Redox-Active Esters with α,ß-Unsaturated Carboxylic Acids.

An efficient visible-light-induced decarboxylative coupling between α,ß-unsaturated carboxylic acids and alkyl N-hydroxyphthalimide esters has been developed. A wide range of redox-active esters derived from aliphatic carboxylic acids (1°, 2° and 3°) proved viable in this dual decarboxylation process, affording a broad scope of substituted alkenes in moderate to excellent yields with good E/Z selectivities. This redox-neutral procedure was highlighted by its mild conditions, operational simplicity, easy accessibility of carboxylic acids, and excellent functional-group tolerance.