title: Macrobicyclic cage amine ligands for copper radiopharmaceuticals: a single bivalent cage amine containing two Lys3-bombesin targeting peptides.
abstract: The synthesis of new cage amine macrobicyclic ligands with pendent carboxylate functional groups designed for application in copper radiopharmaceuticals is described. Reaction of [Cu((NH(2))(2)sar)](2+) (sar = 3,6,10,13,16,19-hexaazabicyclo[6.6.6]icosane) with either succinic or glutaric anhydride results in selective acylation of the primary amine atoms of [Cu((NH(2))(2)sar)](2+) to give derivatives with either one or two aliphatic carboxylate functional groups separated from the cage amine framework by either a four- or five-atom linker. The Cu(II) serves to protect the secondary amine nitrogen atoms from acylation, and can be removed to give the free ligands. The newly appended carboxylate functional groups can be used as sites of attachment for cancer-targeting peptides such as Lys(3)-bombesin. The synthesis of the first dimeric sarcophagine-peptide conjugate, possessing two Lys(3)-bombesin peptides tethered to a single cage amine, is presented. This species has been radiolabeled with copper-64 at ambient temperature and there is minimal dissociation of Cu(II) from the conjugate even after two days of incubation in human serum.
authors.affiliation: School of Chemistry, The University of Melbourne, Parkville, Victoria 3010, Australia.
authors.forename: Michelle T
authors.initials: MT
authors.lastname: Ma
authors.forename: Margaret S
authors.initials: MS
authors.lastname: Cooper
authors.forename: Rowena L
authors.initials: RL
authors.lastname: Paul
authors.forename: Karen P
authors.initials: KP
authors.lastname: Shaw
authors.forename: John A
authors.initials: JA
authors.lastname: Karas
authors.forename: Denis
authors.initials: D
authors.lastname: Scanlon
authors.forename: Jonathan M
authors.initials: JM
authors.lastname: White
authors.forename: Philip J
authors.initials: PJ
authors.lastname: Blower
authors.forename: Paul S
authors.initials: PS
authors.lastname: Donnelly
mesh_terms: D000588:Amines / Q000737:chemistry*; D001839:Bombesin / Q000031:analogs & derivatives / Q000737:chemistry*; D018360:Crystallography, X-Ray; D006863:Hydrogen-Ion Concentration; D008024:Ligands; D008239:Lysine / Q000737:chemistry; D047028:Macrocyclic Compounds / Q000138:chemical synthesis / Q000737:chemistry*; D008958:Models, Molecular; D008968:Molecular Conformation; D009943:Organophosphorus Compounds / Q000138:chemical synthesis / Q000737:chemistry*; D010455:Peptides / Q000737:chemistry*; D019275:Radiopharmaceuticals / Q000138:chemical synthesis / Q000737:chemistry*; D013237:Stereoisomerism
chemical_list: D000588:Amines; D008024:Ligands; D047028:Macrocyclic Compounds; D009943:Organophosphorus Compounds; D010455:Peptides; D019275:Radiopharmaceuticals; D008239:Lysine; D001839:Bombesin