Facile synthesis of 2,3-dihydrobenzofuran-3-ylacetic acids and related analogues was successfully carried out by a novel electrochemical aryl radical generation and its 5-exo cyclization followed by a carboxylation sequence of 2-allyloxybromobenzenes by using methyl 4-tert-butylbenzoate as an electron-transfer mediator.

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Besides benzofurans, other cyclic systems can also be constructed. In all cases, trace amounts of open-chain acids of type (IV) are formed. -(SENBOKU*, H.; MICHINISHI, J.-Y.; HARA, S.; Synlett 2011, 11, 1567-1572, http://dx.doi.org/10.1055/s-0030-1260794 ; Div. Chem. Process Eng., Grad. Sch. Eng., Hokkaido Univ., Sapporo 060, Japan; Eng.) -Mais 47-088

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