N-phenyl-N-(4-piperidinyl)amides useful as analgesics
申请人:Glaxo Inc.
公开号:US05019583A1
公开(公告)日:1991-05-28
N-Phenyl-N-(4-piperdinyl)amide derivatives are disclosed having the general formula (I): ##STR1## wherein X is a member selected from the group consisting of alkoxy-carbonyl-lower alkyl, lower alkyl-carbonyloxy-lower alkyl, alkenyloxy-carbonyl-lower alkyl, and (C.sub.1-2)alkoxy-(C.sub.1-2)-alkoxy-carbonyl-lower alkyl, and Ar, R, R.sup.1 and R.sup.2 are defined hereinafter, including isomeric forms thereof and acid addition salts thereof. The compounds exhibit analgesic activity having relatively short durations of analgesic action. The invention embraces the compounds (I), pharmaceutical compositions of (I) and methods of providing analgesia with (I). Also included are certain novel intermediates for making (I).
Design, synthesis, and pharmacological evaluation of ultrashort- to long-acting opioid analgesics
作者:Paul L. Feldman、Michael K. James、Marcus F. Brackeen、Joanne M. Bilotta、Suzanne V. Schuster、Avis P. Lahey、Michael W. Lutz、M. Ross Johnson、H. Jeff Leighton
DOI:10.1021/jm00111a041
日期:1991.7
In an effort to discover a potent ultrashort-acting mu-opioid analgetic that is capable of metabolizing to an inactive species independent of hepatic function, several classes of 4-anilidopiperidine analgetics were synthesized and evaluated. One series of compounds displayed potent mu-opioid agonist activity with a high degree of analgesic efficacy and an ultrashort to long duration of action. These analgetics, 4-(methoxycarbonyl)-4-[(1-oxopropyl)phenylamino]-1-piperidinepropanoic acid alkyl esters, were evaluated in vitro in the guinea pig ileum for mu-opioid activity, in vivo in the rat tail withdrawal assay for analgesic efficacy and duration of action, and in vitro in human whole blood for their ability to be metabolized in blood. Compounds in this series were all shown to be potent mu-agonists in vitro, but depending upon the alkyl ester substitution the potency and duration of action in vivo varied substantially. The discrepancies between the in vitro and in vivo activities and variations in duration of action are probably due to different rates of ester hydrolysis by blood esterase(s). The SAR with respect to analgesic activity and duration of action as a function of the various esters synthesized is discussed. It was also demonstrated that the duration of action for the ultrashort-acting analgetic, 8, does not change upon prolonged infusion or administration of multiple bolus injections.