Critically for those substrates (1h-1j), the reactions stopped before complete conversion. It is worth mentioning that electrolysis of Boc-Glu-OMe (1j) afforded methyl 4-(N-Boc)-4-methoxybutanoate 3j as the byproduct in 8% yield (see Supporting Information). Its formation can be rationalized by decarboxylation in a Hofer-Moest-type process. No conversion was achieved with -branched amino acid derivatives, e.g. valine.