Structural Studies on Bioactive Compounds. 39. Biological Consequences of the Structural Modification of DHFR-Inhibitory 2,4-Diamino-6-(4-substituted benzylamino-3-nitrophenyl)-6-ethylpyrimidines (‘benzoprims')
摘要:
Benzimidazole-N-oxide modifications of potent lipophilic dihydrofolate reductase (DHFR) inhibitors (e.g., methylbenzoprim 1 and dichlorobenzoprim 2) have been prepared by basepromoted cyclization of the nitrophenylbenzylamino groups to explore the possibility that abrogation of DHFR-inhibitory activity might reveal clues to an alternative anti-ras mechanism. Examples of the new series had only low growth inhibitory activities (Gi(50) generally > 50 muM) against colon HCT116 and lung HT29 cell lines but, unlike methylbenzoprim, this activity was unaffected by hypoxanthine/thymidine rescue.
Structural Studies on Bioactive Compounds. 39. Biological Consequences of the Structural Modification of DHFR-Inhibitory 2,4-Diamino-6-(4-substituted benzylamino-3-nitrophenyl)-6-ethylpyrimidines (‘benzoprims')
摘要:
Benzimidazole-N-oxide modifications of potent lipophilic dihydrofolate reductase (DHFR) inhibitors (e.g., methylbenzoprim 1 and dichlorobenzoprim 2) have been prepared by basepromoted cyclization of the nitrophenylbenzylamino groups to explore the possibility that abrogation of DHFR-inhibitory activity might reveal clues to an alternative anti-ras mechanism. Examples of the new series had only low growth inhibitory activities (Gi(50) generally > 50 muM) against colon HCT116 and lung HT29 cell lines but, unlike methylbenzoprim, this activity was unaffected by hypoxanthine/thymidine rescue.