Journal
CHEMISTRY-A EUROPEAN JOURNAL
Volume 25, Issue 45, Pages 10698-10709Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.201901512
Keywords
chelates; gallium; kinetics; radiochemistry; thermodynamics
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Funding
- University of Milan [PSR2018]
- Hungarian National Research, Development and Innovation Office [NKFIH K-128201]
- European Regional Development Fund [GINOP-2.3.2-15-2016-00008, GINOP-2.3.3-15-2016-00004]
- EU
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Two structurally constrained chelators based on a fused bicyclic scaffold, 4-amino-4-methylperhydro-pyrido[1,2-a][1,4]diazepin-N,N ',N '-triacetic acids [(4R*,10aS*)-PIDAZTA (L1) and (4R*,10aR*)-PIDAZTA (L2)], were designed for the preparation of Ga-III-based radiopharmaceuticals. The stereochemistry of the ligand scaffold has a deep impact on the properties of the complexes, with unexpected [Ga(L2)OH] species being superior in terms of both thermodynamic stability and inertness. This peculiar behavior was rationalized on the basis of molecular modeling and appears to be related to a better fit in size of Ga-III into the cavity of L2. Fast and efficient formation of the Ga-III chelates at room temperature was observed at pH values between 7 and 8, which enables Ga-68 radiolabeling under truly physiological conditions (pH 7.4).
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