Compounds consisting of the catechol group con­ nected to an amino acid or a small peptide only re­ cently have been the subject of few papers concern­ ing their structure-activity relationship. A number of 2,3-dihydroxybenzoic acid amides such as polyamine derivatives: parabactin [1 ], agrobactin [2], vibriobactin [3], or amino acid derivatives: glycine [4], lysine [5], serine [6 ], and threon...

An efficient triphenylphosphine oxide-catalyzed amidation and esterification for the rapid synthesis of a series dipeptides, amides, esters is described. This reaction applicable to challenging couplings hindered carboxylic acids with weakly nucleophilic amines or alcohols, giving products in good yields (67–90%) without racemization. system employs highly reactive intermediate Ph3PCl2 as activ...