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Issue 21, 2012
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Zinc(II) complexes of constrained antiviral macrocycles

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The configurations of metallocyclams are of interest in relation to protein recognition and anti-HIV activity. We have synthesised four novel zinc(II) complexes with hexyl-Me2-cyclam (HMC; 3,14-dimethyl-2,6,13,17-tetraazatricyclo(,12)docosane), 1, and naphthyl-hexyl-Me2-cyclam (NHMC; 2,13-bis(1-naphthylmethyl)-5,16-dimethyl-2,6,13,17-tetraazatricyclo(,12)docosane), 2, as ligands. X-ray crystallographic data for Zn(II)–HMC diacetate, 3 show that zinc is six-coordinate in a distorted octahedral environment bound to four equatorial N atoms from the macrocycle and two axial acetato O atoms. The 14-membered metallo-macrocycle adopts a trans-III (RRSS) configuration with two six-membered rings in chair forms and two five-membered rings in gauche forms. In the chlorido Zn(II)–HMC complex 5, zinc appears to be 5-coordinate with square-pyramidal geometry. Interestingly, the chlorido Zn(II)–NHMC complex 6 crystallised in a trans-I configuration containing 4-coordinate tetrahedral zinc bound to three cyclam ring N atoms, a possible model for intermediates formed during the uptake and release of metals by cyclams. The ligand 1 and the zinc complex 3 were active towards viral strains HIV-1 (IIIB) (IC50 values of 10.51 ± 0.23 and 3.50 ± 0.33 μM, respectively), and HIV-2 (ROD) (IC50 values of 133.78 ± 14.10 and >110.67 μM, respectively). 2D [1H, 13C] and [1H, 15N] NMR spectroscopic studies suggested that the types of configurational isomers present in solution depend on the axial ligand.

Graphical abstract: Zinc(ii) complexes of constrained antiviral macrocycles

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The article was received on 19 Jan 2012, accepted on 29 Feb 2012 and first published on 02 Apr 2012

Article type: Paper
DOI: 10.1039/C2DT30140G
Citation: Dalton Trans., 2012,41, 6408-6418
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    Zinc(II) complexes of constrained antiviral macrocycles

    A. Ross, J. Choi, T. M. Hunter, C. Pannecouque, S. A. Moggach, S. Parsons, E. De Clercq and P. J. Sadler, Dalton Trans., 2012, 41, 6408
    DOI: 10.1039/C2DT30140G

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