Synthesis and Structure−Activity Relationships of Phenylenebis(methylene)- Linked Bis-azamacrocycles That Inhibit HIV-1 and HIV-2 Replication by Antagonism of the Chemokine Receptor CXCR4
- Gary J. Bridger
- ,
- Renato T. Skerlj
- ,
- Sreenivasan Padmanabhan
- ,
- Stephen A. Martellucci
- ,
- Geoffrey W. Henson
- ,
- Sofie Struyf
- ,
- Myriam Witvrouw
- ,
- Dominique Schols
- , and
- Erik De Clercq
Abstract

Bis-tetraazamacrocycles such as the bicyclam AMD3100 are a class of potent and selective anti-HIV-1 and HIV-2 agents that inhibit virus replication by binding to the chemokine receptor CXCR4, the co-receptor for entry of X4 viruses. With the aim of optimizing the anti-HIV-1 and HIV-2 activity of bis-azamacrocycles, a series of analogues were synthesized which contain neutral heteroatom (oxygen, sulfur) or heteroaromatic (of lower pKa than a secondary amine) replacements for the amino groups of AMD3100. The introduction of one or more heteroatoms such as oxygen or sulfur into the macrocyclic ring of p-phenylenebis(methylene)-linked dimers (to give N3X or N2X2 bis-macrocycles) gave analogues with substantially reduced anti-HIV-1 (IIIB) and anti-HIV-2 (ROD) potency. In addition, the bis-sulfur analogue was also markedly more cytotoxic to MT-4 cells. However, bis-tetraazamacrocycles featuring a single pyridine group incorporated within the macrocyclic framework exhibited anti-HIV-1 and HIV-2 potency comparable to that of their saturated, aliphatic counterparts. The p-phenylenebis(methylene)-linked dimer of the py[14]aneN4 macrocycle inhibited HIV-1 replication at a 50% effective concentration (EC50) of 0.5 μM while remaining nontoxic to MT-4 cells at concentrations approaching 200 μM. A series of analogues containing macrocyclic heteroaromatic groups of varying pKa were also synthesized, and their ability to inhibit HIV replication was evaluated. Replacing the pyridine moiety of the py[14]aneN4 macrocyclic ring with pyrazine or pyridine groups substituted in the 4-position (with electron-withdrawing or -donating groups) either reduced antiviral potency or increased cytotoxicity to MT-4 cells. Finally, we synthesized a series of analogues in which the ring size of the bis-pyridyl macrocycles was varied between 12 and 16 members per ring including the py[iso-14]aneN4 ring system, an isomer of the py[14]aneN4 macrocycle. The p-phenylenebis(methylene)-linked dimer of the py[iso-14]aneN4 (AMD3329) displayed the highest antiviral activity of the bis-azamacrocyclic analogues reported to date, exhibiting EC50's against the cytopathic effects of HIV-1 and HIV-2 replication of 0.8 and 1.6 nM, respectively, that is, about 3−5-fold lower than the EC50 of AMD3100. AMD3329 also inhibited the binding of a specific CXCR4 mAb and the Ca2+ flux induced by SDF-1α, the natural ligand for CXCR4, more potently than AMD3100. Furthermore, AMD3329 also interfered with virus-induced syncytium formation at an EC50 of 12 nM.
*
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AnorMED Inc.
‡
Johnson Matthey Pharmaceutical Research.
§
Rega Institute for Medical Research.
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