Metal complexes of biologically important ligands, CXIV - ferrocenyl-oxazolones as N and C donors in Pd(II), Pt(II) and Ir(III) complexes and ferrocenoyl-dipeptides, Part 113

2-Ferrocenyl-4R-5(4H)-oxazolones 1-5 were obtained from N-ferroclnoyl-alpha -amino acids and function as N donors in dichloro-phosphine-palladium(II) a nd platinum(II) complexes 6-18. The reaction of ferrocenyl-oxazolone and fe rrocenyl-bis(oxazolone) with [Cp*IrCl2](2) afforded trimetallic and pentame tallic complexes 19 and 20 with a C, N bridging oxazolone. Ring opening. of the ferrocenyl-oxazolones 1, 2 and 4 with alpha-amino acid eaters gave N-f errocenoyl-dipeptide esters 21-26. In the ferrocene bis(dipeptides) the two peptide esters are aligned parallel by hydrogen bonding. The structures of 6 and 19 were determined by X-ray diffraction. (C) 1999 Elsevier Science S .A. All rights reserved.