Mannich-base hydroxamic acid prodrugs for the improved bioavailability of non-steroidal anti-inflammatory agents, a process for preparing and a pharmaceutical composition containing them.

摘要

Novel prodrug forms of known non-steroidai anti-inflammatory agents and a process for preparing them are disclosed, said prodrugs having the structural formula <CHEM> wherein R-@- is the acyl residue of a non-steroidal anti-inflammatory agent containing a carboxylic acid function; R1 and R2 each represent alkyl, alkenyl, aryl, cycloalkyl, cycloalkenyl, alkynyl, aralkyl, alkaryl aralkenyl, aralkynyl, alkenylaryl, and alkynylaryl, and substituted derivatives of the above groups; or R1 and R2 are combined so that -NR1R2 together represent the residue of a heterocyclic compound containing one secondary nitrogen atom; R3 is hydrogen, R1, <CHEM> -CH2OCOR min 1, -CH2ONO2, pyridyl, furyl, cyano, carbamyl, alkyl carbamyl, and dialkylcarbamyl; R min 1 is any radical encompassed by the definition of R1 above; or a non-toxic pharmaceutically acceptable acid addition salt or oxide thereof. These compounds are characterized as being more readily bioavailable, less irritating to topical and gastric mucosal membranes, and more permeable through topical membranes than are the "parent" nonsteroidal anti-inflammatory drugs from which they are derived.