Synthesis and biological evaluation of tolrestat metabolites
摘要:
The syntheses of five, previously isolated (from the rat) metabolites of the aldose reductase inhibitor, tolrestat (1) are described, namely tolrestat S-oxide (2), O-desmethyl tolrestat (3), O-desmethyl oxotolrestat (4), O-desmethyl tolrestat sulfate (5) and O-desmethyl oxotolrestat sulfate (6). The synthesis of the metabolite oxotolrestat (7) has been previously reported. These syntheses thus confirmed the structures of the metabolites. The synthetic compounds were tested in the 4-day galactosemic rat model (in vivo) and in the aldose reductase in vitro screen. Only the S-oxide (2) and oxotolrestat (7) have shown very good in vivo activity. All other metabolites were either inactive or had only marginal activity.
Disclosed herein are N-[[6-methoxy-5-(trifluoromethyl)-1-naphthalenyl]-thioxomethyl]-N-methylgl ycine S-oxide (tolrestat S-oxide) and the amide thereof and methods of their preparation. The S-oxides are new aldose reductase inhibitors useful for the treatment of prevention of diabetic complications.