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(Cp-R)M(CO)(3)] (M= Re or Tc-99m) conjugates for theranostic receptor targeting


Can, Daniel; Schmutz, Paul; Sulieman, Samer; Spingler, Bernhard; Alberto, Roger (2013). (Cp-R)M(CO)(3)] (M= Re or Tc-99m) conjugates for theranostic receptor targeting. CHIMIA International Journal for Chemistry, 67(4):267-270.

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.

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.

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Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:07 Faculty of Science > Department of Chemistry
Dewey Decimal Classification:540 Chemistry
Language:English
Date:2013
Deposited On:18 Oct 2013 11:03
Last Modified:05 Apr 2016 17:02
Publisher:Swiss Chemical Society
ISSN:0009-4293
Publisher DOI:https://doi.org/10.2533/chimia.2013.267
PubMed ID:23967703

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