1,2-Benzothiazine 1,1-dioxide carboxylate derivatives as novel potent inhibitors of aldose reductase

Bioorg Med Chem. 2011 Dec 1;19(23):7262-9. doi: 10.1016/j.bmc.2011.07.051. Epub 2011 Jul 30.


Due to the importance of aldose reductase (ALR2) as a potential drug target in the treatment of diabetic complications, there are increasing interests in design and synthesis of ALR2 inhibitors. Here, we prepared 1,2-benzothiazine 1,1-dioxide acetic acid derivatives and investigated their inhibition activity. Most of these derivatives were found to be active with IC(50) values ranging from 0.11 μM to 10.42 μM, and compound 8d, 2-[2-(4-bromo-2-fluorobenzyl)-1,1-dioxido-2H-1,2-benzothiazin-4(3H)-ylidene]acetic acid, showed the most potent inhibition activity. Further, SAR and docking studies suggest that in comparison with the α,β-unsaturated derivatives, the saturated carboxylic acid derivatives had a greater binding affinity with the enzyme and thus an enhanced inhibition activity. Therefore, development of more powerful ARIs based on benzothiazine 1,1-dioxide by stereo-controlled synthesis could be expected.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Aldehyde Reductase / antagonists & inhibitors*
  • Aldehyde Reductase / chemistry
  • Aldehyde Reductase / metabolism
  • Animals
  • Carboxylic Acids / chemical synthesis
  • Carboxylic Acids / chemistry
  • Carboxylic Acids / pharmacology
  • Enzyme Inhibitors / chemical synthesis
  • Enzyme Inhibitors / chemistry
  • Enzyme Inhibitors / pharmacology*
  • Humans
  • Models, Molecular
  • Rats
  • Rats, Wistar
  • Structure-Activity Relationship
  • Thiazines / chemical synthesis
  • Thiazines / chemistry
  • Thiazines / pharmacology*


  • Carboxylic Acids
  • Enzyme Inhibitors
  • Thiazines
  • Aldehyde Reductase