title: [(Cp-R)M(CO)3] (M = Re or 99mTc) conjugates for theranostic receptor targeting.
abstract: Cyclopentadienyl complexes of 99mTc became accessible via a retro Diels-Alder synthetic approach of dimerized cyclopentadiene derivatives. So far, this approach was limited to derivatives comprising a carboxylic acid group, directly conjugated to the Cp-ring, leading to complexes [(C5H5COOH)99mTc(CO)3] and [(C5H5CONH-R)99mTc(CO)3], respectively. The introduction of an -NCO group via Curtius rearrangement and subsequent in situ reactions with alcohols or amines gave [(C5H5NHCO-OR)2] and [(C5H5NHCO-NHR)2]. To increase the spacer lengths between the Cp-ring and the functional groups, methylene and ethylene spacers were introduced to yield C5H5-CH2COOH and C5H5-C2H4COOH respectively. The latter Cp-derivatives reacted with [99mTcO4)]- and in the presence of CO releasing/reducing agents to the corresponding [(C5H5-spacer-COOH)99mTc(CO)3] complexes. The carboxylato groups can be derivatized with targeting functions, leading to structurally altered receptor binding complexes, with 99mTc for imaging and with rhenium for therapy. The nature of the 99mTc complexes was assessed by HPLC comparison with the corresponding rhenium compounds.
authors: University of Zürich, Institute of Inorganic Chemistry, Winterthurerstrasse 190, CH-8057 Zürich.
authors: Daniel
authors: D
authors: Can
authors: Paul
authors: P
authors: Schmutz
authors: Samer
authors: S
authors: Sulieman
authors: Bernhard
authors: B
authors: Spingler
authors: Roger
authors: R
authors: Alberto
mesh_terms: D006801:Humans; D015394:Molecular Structure; D015609:Organotechnetium Compounds / Q000737:chemistry* / Q000378:metabolism; D019275:Radiopharmaceuticals / Q000737:chemistry* / Q000378:metabolism; D017978:Receptors, Growth Factor / Q000737:chemistry* / Q000378:metabolism; D012211:Rhenium / Q000737:chemistry* / Q000378:metabolism
chemical_list: D015609:Organotechnetium Compounds; D019275:Radiopharmaceuticals; D017978:Receptors, Growth Factor; D012211:Rhenium