Scheme 4. Preliminary results towards arylation of tetrapeptides. Reactions performed on 1 μmol scale. Relative HPLC ratios of the area of the product over remaining starting material and peptide side-products at 214 nm are given. Average of 3 independent trials. aCalibrated yield, see SI for details. bCompound 8c could not be fully separated from a side product by HPLC.
