Multifunctional aldose reductase inhibitors based on 2H-benzothiazine 1,1-dioxide
RSC ADVANCES(2016)
Abstract
A series of benzothiazine derivatives were designed and synthesized for the development of drug candidates for diabetic complications. A number of derivatives having a phenolic hydroxyl-substituted N2-aromatic side chain and a C4-acetic acid head group on the core structure were found to be potent and selective aldose reductase inhibitors. 8a with a phenolic 4-hydroxyl at N2-styryl side chain was proved to be the most active with an IC50 value of 0.094 mu M. All compounds with the N2-styryl side chain showed good antioxidant activity using the DPPH radical scavenging test, and among them, compounds with phenolic hydroxyl-substituted N2-styryl were potent both in activities of ALR2 inhibition and antioxidation. The results suggest a success in the development of multifunctional aldose reductase inhibitors based on the benzothiazine framework.
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