Rakowitz_2002_Eur.J.Pharm.Sci_15_11

Diphenylmethyleneaminooxycarboxylic acids were found to represent novel type inhibitors of the enzyme aldose reductase Ester derivatives of the most active compound 3c IC(50)=33 mgr;M were prepared as potential prodrugs and the rate of degradation was studied by treatment with buffers plasma and various hydrolytic enzymes Whereas all compounds were not hydrolysed at physiological pH incubation in the presence of enzyme led to hydrolysis The rate of enzymatic degradation however depended on the nature of the ester function Whereas the isopropyl ester 4 turned out to be the most stable compound the ethyl ester 2c could be cleaved in the presence of esterase and lipase respectively The benzylic and aromatic esters were found to be hydrolysed rapidly in the presence of lipase benzyl ester 7 or in plasma by cholinesterase and esterase phenyl ester 6 respectively