Convenient Synthesis of Cyclic α-Alkoxyl-α,β-unsaturated Carboxylic Acids by Nickel-catalyzed Electrochemical Carboxylation of Lactone Enol Triflates

Abstract

Electrochemical carboxylation of lactone enol triflates in DMF containing a catalytic amount of NiBr2·bpy with a platinum cathode and a magnesium anode under an atmospheric pressure of CO2 gave the corresponding cyclic α-alkoxyl-α,β-unsaturated carboxylic acids, captodative cycloalkenes, in good yields.