H. Senboku, Y. Fujimura, A. Yoshikawa
1998
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Abstract
Electrochemical carboxylation of 2-bromomethyl-1,4-dibromo-2-butene (1) with atmospheric carbon dioxide in a DMF solution containing Bu4NI with a Pt cathode and a manganin alloy or nickel anode gave 3-methylene-4-pentenoic acid (2) in 57% yield. The acid 2 can be used as a diene in an aqueous intermolecular Diels-Alder reaction with dimethyl fumarate to give the adduct 4 in 67% yield.