Substituted aminopyridines as potent and selective phosphodiesterase-4 inhibitors
作者:Bernard Côté、Richard Frenette、Sylvie Prescott、Marc Blouin、Christine Brideau、Yves Ducharme、Richard W. Friesen、France Laliberté、Paul Masson、Angela Styhler、Yves Girard
DOI:10.1016/s0960-894x(02)01030-2
日期:2003.2
The synthesis and the biological evaluation of new potent phosphodiesterase type 4 (PDE4) inhibitors are presented. This new series was elaborated by replacement of the metabolically resistant phenyl hexafluorocarbinol of L-791,943 (1) by a substituted aminopyridine residue, The structure-activity relationship of N-substitution on 3 led to the identification of (-)-3n which exhibited a good PDE4 inhibitor activity (HWB-TNFalpha=0.12 muM) and an improved pharmacokinetic profile over L-791,943 (rat t(1/2) = 2 h). (-)-3n was well tolerated in ferret with an emetic threshold of 30 mg/kg (po) and was found to be active in the ovalbumin-induced bronchoconstriction model in guinea pig (54%, 0.1 mg/kg, ip) as well as the ascaris-induced bronchoconstriction model in sheep (64%/97%. early,,late, 0.5 mg/kg. iv). (C) 2003 Elsevier Science Ltd. All rights reserved.