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. Author manuscript; available in PMC: 2014 Feb 18.
Published in final edited form as: Inorg Chem. 2012 Nov 5;52(4):1694–1700. doi: 10.1021/ic3017613

Scheme 2.

Scheme 2

Synthesis of CA-9.

Reagents and conditions: (a) CuI, DIPEA THF-ACN, 3 days, 76%; (b) 80% TFA-DCM, 6 h, RT; (c) GdCl3·6H2O, citrate buffer, pH 7, 24 h, RT, sonication; (d) Dialysis, 1,000 MWCO, 48 h; (e) Lyophilization, 82%.