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M9650104.TXT
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1996-03-09
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Document 0104
DOCN M9650104
TI Synthesis and structure-activity relationships of
phenylenebis(methylene)-linked bis-tetraazamacrocycles that inhibit
human immunodeficiency virus replication. 2. Effect of heteroaromatic
linkers on the activity of bicyclams.
DT 9605
AU Bridger GJ; Skerlj RT; Padmanabhan S; Martellucci SA; Henson GW; Abrams
MJ; Joao HC; Witvrouw M; De Vreese K; Pauwels R; De Clercq E; Johnson
Matthey Pharmaceutical Research, West Chester,; Pennsylvania 19380, USA.
SO J Med Chem. 1996 Jan 5;39(1):109-19. Unique Identifier : AIDSLINE
MED/96136793
AB A series of bicyclam analogs connected through a heteroaromatic linker
have been synthesized and evaluated for their inhibitory effects on
HIV-1 (IIIB) and HIV-2 (ROD) replication in MT-4 cells. The activity of
pyridine- and pyrazine-linked bicyclams was found to be highly dependent
upon the substitution of the heteroaromatic linker connecting the cyclam
rings. For example, 2,6- and 3,5-pyridine-linked bicyclams were potent
inhibitors of HIV-1 and HIV-2 replication, whereas the 2,5- and
2,4-substituted pyridine-linked compounds exhibited substantially
reduced activity and, in addition, were found to be highly toxic to MT-4
cells. We have subsequently discovered that these effects are not
unique; amino-substituted linkers also have the potential to deactivate
phenylenebis(methylene)-linked bicyclams. A model is proposed to explain
the deactivating effects of the pyridine group in certain substitution
patterns based on the ability of the pyridine nitrogen to participate in
pendant conformations (complexation) with the adjacent azamacrocyclic
ring, which may involve hydrogen bonding or coordination to a transition
metal. The introduction of a sterically hindering group such as phenyl
at the 6-position of the 2,4-substituted pyridine-linked bicyclam
appears to prevent pendant conformations, providing an analog with
comparable anti-HIV-1 and anti-HIV-2 activities to the parent
m-phenylenebis(methylene)-linked bicyclam. The results of this study
have been used to develop a quantitative structure-activity relationship
model with improved predictive capability in order to aid the design of
antiviral bis-azamacrocyclic analogs.
DE Antiviral Agents/CHEMISTRY/*CHEMICAL SYNTHESIS/PHARMACOLOGY Aza
Compounds/CHEMISTRY/CHEMICAL SYNTHESIS/PHARMACOLOGY Cell Line Cell
Survival/DRUG EFFECTS Heterocyclic Compounds/CHEMISTRY/*CHEMICAL
SYNTHESIS/PHARMACOLOGY Human Hydrogen Bonding Hydrogen-Ion
Concentration HIV-1/*DRUG EFFECTS HIV-2/*DRUG EFFECTS Molecular
Conformation Molecular Structure Spectrophotometry, Ultraviolet
Structure-Activity Relationship Support, Non-U.S. Gov't Virus
Replication/DRUG EFFECTS JOURNAL ARTICLE
SOURCE: National Library of Medicine. NOTICE: This material may be
protected by Copyright Law (Title 17, U.S.Code).