Synthesis and biological evaluation of novel benzyl-substituted flavones as free radical (DPPH) scavengers and α-glucosidase inhibitors

J Asian Nat Prod Res. 2010 Nov;12(11):978-84. doi: 10.1080/10286020.2010.511190.

Abstract

Pharmacologically motivated natural product investigations have yielded a large variety of structurally unique lead compounds with interesting biomedical properties, but the natural roles of these molecules often remain unknown. In the present investigation, a series of benzyl substituted-flavone derivatives have been synthesized from the lead compounds and were screened against 1,1-diphenyl-2-picrylhydrazyl (DPPH) free radical scavenging and α-glucosidase inhibitory properties. The resulting activity profiles of these flavone derivatives were compared for degree of similarity to the profile of 1-3. Most of the synthesized derivatives displayed potent activities when compared to the parent compounds. Maximum potencies for DPPH free radical scavenging activity were observed only in compounds containing the 4-hydroxyl substitution and 3-methoxyl group on the phenyl ring. While the 2- and 4-hydroxyl group substitutions on the phenyl ring seem to be crucial for the intestinal α-glucosidase inhibitory activity.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Benzene Derivatives / chemical synthesis*
  • Benzene Derivatives / chemistry
  • Benzene Derivatives / pharmacology*
  • Bignoniaceae / chemistry
  • Biphenyl Compounds / pharmacology
  • Flavanones
  • Flavonoids / chemical synthesis*
  • Flavonoids / chemistry
  • Flavonoids / pharmacology*
  • Free Radical Scavengers / chemical synthesis*
  • Free Radical Scavengers / chemistry
  • Free Radical Scavengers / pharmacology*
  • Glycoside Hydrolase Inhibitors*
  • Hypoglycemic Agents / chemical synthesis*
  • Hypoglycemic Agents / chemistry
  • Hypoglycemic Agents / pharmacology
  • India
  • Molecular Structure
  • Picrates / pharmacology
  • Plant Roots / chemistry
  • Plants, Medicinal / chemistry

Substances

  • Benzene Derivatives
  • Biphenyl Compounds
  • Flavanones
  • Flavonoids
  • Free Radical Scavengers
  • Glycoside Hydrolase Inhibitors
  • Hypoglycemic Agents
  • Picrates
  • chrysin
  • baicalein
  • 5,7-dihydroxy-6-methoxy-2-phenylchromen-4-one
  • 1,1-diphenyl-2-picrylhydrazyl