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Antimitotic agents: structure-activity studies with some pyridine derivatives.
C Temple1, G A Rener, W R Waud
1Organic Chemistry Research Department, Southern Research Institute, Birmingham, Alabama 35255-5305.
Journal of Medicinal Chemistry
|October 12, 1992
Summary
Novel oxime compounds show antitumor activity in mice. Modifications to these 5-nitropyridine derivatives impact their efficacy, with some showing potential for cancer treatment by inhibiting DNA and RNA synthesis.
Area of Science:
- Medicinal Chemistry
- Pharmacology
- Organic Synthesis
Background:
- Ethyl pyrido[3,4-b]pyrazin-7-ylcarbamates are potent antimitotic agents.
- The study investigates related 5-nitropyridine compounds as potential antitumor agents.
Purpose of the Study:
- To evaluate the antitumor activity of oxime derivatives of ethyl [6-amino-4-[(1-methyl-2-phenyl-2-oxoethyl)amino]-5-nitropyridin -2-yl] carbamate (8) and related compounds in mice.
- To explore structure-activity relationships within the 5-nitropyridine series.
- To investigate the mechanism of action of these compounds.
Main Methods:
- Synthesis of oxime derivatives and related compounds.
- In vivo testing of antitumor activity in mice.
- Chemical modification and reduction of functional groups to assess impact on biological activity.
- Preliminary in vitro studies to compare potency and investigate potential in vivo conversion.
Main Results:
- Antitumor activity was observed for the oxime of compound (8) and related 5-nitropyridine derivatives.
- Biological activity was reduced by replacing the oxime with keto or alcohol groups, or by removing the methyl group on the side chain.
- Reduction of the nitro group to an amino group in alcohol-containing side chains enhanced biological activity.
- 5-Nitropyridine oximes were less potent antimitotic agents than pyridopyrazines and were not converted to them in vivo.
- Inhibition of pyrimidine nucleoside incorporation into DNA and RNA was identified as a potential mechanism of action for the 5-nitropyridine oximes.
Conclusions:
- The oxime of ethyl [6-amino-4-[(1-methyl-2-phenyl-2-oxoethyl)amino]-5-nitropyridin -2-yl] carbamate (8) and related compounds exhibit antitumor activity.
- Structural modifications significantly influence the biological activity of these 5-nitropyridine derivatives.
- The 5-nitropyridine oximes may exert their effects through inhibition of nucleic acid synthesis, distinct from the antimitotic action of pyridopyrazines.