Synthesis and evaluation of 2-pyridinone derivatives as HIV-1 specific reverse transcriptase inhibitors. 1. Phthalimidoalkyl and -alkylamino analogues.
A potent (IC50 = 30 nM), specific nonnucleoside HIV-1 reverse transcriptase (RT) inhibitor 3-[N-(phthalimidomethyl)amino]-5-ethyl-6-methylpyridin-2(1H) -one (1), was discovered through an in vitro screening program. This compound did not inhibit (IC50 > 300 microns) other DNA and RNA polymerases, including HIV-2 RT and SIV-RT. Unfortunately, hydrolytic instability of this (aminomethyl)phthalimide precluded use as an antiviral agent. In the first paper of this series, preliminary development efforts are described which produced ethylphthalimide 20, a hydrolytically stable compound with reduced (100-fold) HIV-1 RT inhibitory activity and weak (CIC95 = 40 microM) antiviral activity in H9 cells. Structure-activity studies demonstrated the importance of the 5-ethyl, 6-methyl substituent pattern on the pyridinone ring and the need for a flexible two-atom linker between the pyridinone and phthalimide heterocycles. These leads, 1 and 20, provided a basis for the further development of this structural class of inhibitors from which several compounds, the subject of accompanying reports, were selected for clinical evaluation.
D000998:Antiviral Agents / Q000737:chemistry / Q000494:pharmacology*; D002478:Cells, Cultured; D054303:HIV Reverse Transcriptase; D015497:HIV-1 / Q000201:enzymology*; D015498:HIV-2 / Q000201:enzymology; D006868:Hydrolysis; D009682:Magnetic Resonance Spectroscopy; D010797:Phthalimides / Q000138:chemical synthesis / Q000737:chemistry / Q000494:pharmacology*; D011728:Pyridones / Q000138:chemical synthesis / Q000737:chemistry / Q000494:pharmacology*; D018894:Reverse Transcriptase Inhibitors; D015302:Simian Immunodeficiency Virus / Q000201:enzymology
D000998:Antiviral Agents; D010797:Phthalimides; D011728:Pyridones; D018894:Reverse Transcriptase Inhibitors; C077562:3-(N-(phthalimidomethyl)amino)-5-ethyl-6-methylpyridin-2-(1H)-one; C017679:2-hydroxypyridine; D054303:HIV Reverse Transcriptase