The aim of this work was to prepare a novel class of Cu-64(II) labeled complexes with the new macrocyclic ligands 1,10-dithia-4,7-diazacyclododecane-3,8-dicarboxylic acid (NEC-SE, 1), 1,10-dithia-4,7-diazacyclotridecane-3,8-dicarboxylic acid (NEC-SP, 2) and 1,10-dithia-4,7-diazacyclotetradecane- 3,8-dicarboxylic acid, (NEC-SB, 3) to evaluate the usefulness of these macrocycles for potential utility as Cu-64(II) chelators. The corresponding non-radioactive complexes [Cu(NEC-SE)]center dot 3H(2)O (4), [Cu(NEC-SP)]center dot 3H(2)O (5) and [Cu(NEC-SB)] (6) were prepared and their Cu-64-analogs, [Cu-64(NEC-SE)] (7) and [Cu-64(NEC-SP)] (8) and [Cu-64(NEC-SB)] (9) were produced in > 98% radiochemical purity. Rats were injected with complex 7, 8 or 9 and were euthanized at 1, 4 and 24 h. All three complexes are cleared from the blood over the first hour following injection but there is poor clearance of this activity over 24 h. A similar pattern of retention was noted in the liver where the levels of activity in this tissue at 1 h are not statistically different from those at 24 h. Molecular mechanics and DFT studies were performed on the complexes in order to gain insight into the lower stability.

Synthesis and characterization of the copper(II) complexes of new N2S2-donor macrocyclic ligands: synthesis and in vivo evaluation of the Cu-64 complexes.

PELLEI, Maura;SANTINI, Carlo
2009-01-01

Abstract

The aim of this work was to prepare a novel class of Cu-64(II) labeled complexes with the new macrocyclic ligands 1,10-dithia-4,7-diazacyclododecane-3,8-dicarboxylic acid (NEC-SE, 1), 1,10-dithia-4,7-diazacyclotridecane-3,8-dicarboxylic acid (NEC-SP, 2) and 1,10-dithia-4,7-diazacyclotetradecane- 3,8-dicarboxylic acid, (NEC-SB, 3) to evaluate the usefulness of these macrocycles for potential utility as Cu-64(II) chelators. The corresponding non-radioactive complexes [Cu(NEC-SE)]center dot 3H(2)O (4), [Cu(NEC-SP)]center dot 3H(2)O (5) and [Cu(NEC-SB)] (6) were prepared and their Cu-64-analogs, [Cu-64(NEC-SE)] (7) and [Cu-64(NEC-SP)] (8) and [Cu-64(NEC-SB)] (9) were produced in > 98% radiochemical purity. Rats were injected with complex 7, 8 or 9 and were euthanized at 1, 4 and 24 h. All three complexes are cleared from the blood over the first hour following injection but there is poor clearance of this activity over 24 h. A similar pattern of retention was noted in the liver where the levels of activity in this tissue at 1 h are not statistically different from those at 24 h. Molecular mechanics and DFT studies were performed on the complexes in order to gain insight into the lower stability.
2009
262
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11581/207852
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