Potent, Selective, and Orally Bioavailable Tricyclic Pyridyl Acetamide <i>N</i>-Oxide Inhibitors of Farnesyl Protein Transferase with Enhanced in Vivo Antitumor Activity
作者:F. George Njoroge、Bancha Vibulbhan、Patrick Pinto、W. Robert Bishop、Mathew S. Bryant、Amin A. Nomeir、C.-C. Lin、Ming Liu、Ronald J. Doll、V. Girijavallabhan、Ashit K. Ganguly
DOI:10.1021/jm980013b
日期:1998.5.1
We previously reported compound 1 as a potent farnesyl protein transferase (FPT) inhibitor that exhibited reasonable pharmacokinetic stability and showed moderate in vivo activity against a variety of tumor cell lines. The analogous C-11 single compound, pyridylacetamide 2, was found to be more potent than 1 in FPT inhibition. Further studies showed that modification of the ethano bridge of the tricyclic ring system by conversion into a double bond with concomitant introduction of a single bond at C-11 piperidine resulted in compound 3 that had superior FPT activity and pharmacokinetic stability. Compound 4, a 5-bromo-substituted analogue of 3, showed improved FPT activity, had good cellular activity, and demonstrated a remarkably improved pharmacokinetic profile with AUC of 84.9 and t(1/2) of 82 min. Compound 4 inhibited the growth of solid tumor in DLD-1 model by 70% at 50 mpk and 52% at 10 mpk.