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A New Synthesis of TE2A-a Potential Bifunctional Chelator for (64)Cu
Darpan N Pandya1, Jung Young Kim2, Wonjung Kwak1
1Department of Molecular/Nuclear Medicine, School of Medicine, Kyungpook National University, Daegu, 700-422 Republic of Korea.
Purpose:
The development of a new bifunctional chelator, which holds radiometals strongly in living systems, is a prerequisite for the successful application of disease-specific biomolecules to medical diagnosis and therapy. Recently, TE2A was reported to make kinetically more stable Cu(II) complexes than TETA. Herein, we report a new synthetic route to TE2A and explore its potential as a bifunctional chelator.
Methods:
TE2A was synthesized using the regioselective alkylation of benzyl bromoacetate and successive deprotection of the methylene bridge and benzyl group. Salt-free TE2A was radiolabeled with (64)Cu and microPET imaging was performed to follow the clearance pattern of the (64)Cu-TE2A complex. TE2A was conjugated with cyclic RGD peptide and the TE2A-c(RGDyK) conjugate was radiolabeled with (64)Cu.
Results:
TE2A was prepared in salt-free form from cyclam in an overall yield of 74%. The microPET images showed that (64)Cu-TE2A is excreted rapidly from the body by the kidney and liver. TE2A was successfully conjugated with c(RGDyK) peptide through one carboxylate group and the TE2A-c(RGDyK) conjugate was radiolabeled with (64)Cu in 94% yield within 30 min.
Conclusion:
TE2A can be used by itself as a bifunctional chelator without any further structural modification.
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