In order to apply this strategy to more complex biomolecules in the future, we probed dipeptide substrates (Scheme 2). Phenylalanine-containing dipeptides exhibited moderate yield but maintained excellent (Z)-selectivity for 23 and 24 respectively, in line with the effect of protection groups observed before (vide supra). Primary carboxylic acids are not yet compatible and dehydroalanine product 22 was not obtained.