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Platinum(I1) has been proven to be an effective amino protecting group of a-amino acids. A series of reactions at the carboxylic group of N-coordinated a-amino acids has been carried out to give platinum(I1) complexes with peptide esters, a-amino acid amides and anhydrides and very reactive a-amino acid chlo- rides as ligands. Peptide synthesis at platinum(I1) and removal of platinum(I1) by hydrogenation with hydrogen proceeds practi- cally without racemisation. Platinum(I1) and palladium(I1) com- plexes of derivatives of a-amino acids have been prepared, con- taining Schiff bases, N-glycosides from monosaccharides and a-amino acids, N-chloro amino acid esters, N-diphosphino, N-di- thiocarboxy amino acids, a-imino acids, the three functional ligands a,B- and y,b-dehydro amino acids and N-carboxy-a-dehy- droamino acid anhydrides (Leuchs anhydrides). In cis-C12Pd(al- lylglycine) the y,$-dehydro-a-amino acid is coordinated via the amino and C=C groups. Representatives of the new complexes have been characterized by crystal structure determination.

pure and applied chemistry

Synthesis and reactivity of platinum and palladium complexes with α-amino acids, peptides and derivatives thereof: platinum (II) as amino protecting group