Design, synthesis and evaluation of novel 2-hydroxypyrrolobenzodiazepine-5,11-dione analogues as potent angiotensin converting enzyme (ACE) inhibitors

Bioorg Med Chem. 2013 Aug 1;21(15):4485-93. doi: 10.1016/j.bmc.2013.05.031. Epub 2013 May 31.


A series of novel 10-substituted 2-hydroxypyrrolobenzodiazepine-5,11-diones designed through structure based rational hybridization approach, synthesized by the cyclodehydration of isotonic anhydride with (2S,4R)-4-hydroxypyrrolidine-2-carboxylic acid followed by N-substitution, were evaluated as angiotensin converting enzyme (ACE) inhibitors. Among all the new compounds screened (2R,11aS)-10-((4-bromothiophen-2-yl)methyl)-2-hydroxy-2,3-dihydro-1H-benzo[e]pyrrolo[1,2-a][1,4]diazepine-5,11(10H,11aH)dione, 5v (IC₅₀: 0.272 μM) emerged as most active non-carboxylic acid ACE inhibitor with minimal toxicity comparable to clinical drugs Lisinopril, Benazepril and Ramipril. Favorable binding characteristics in docking studies also supported the experimental results.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Angiotensin-Converting Enzyme Inhibitors / chemical synthesis
  • Angiotensin-Converting Enzyme Inhibitors / chemistry*
  • Angiotensin-Converting Enzyme Inhibitors / pharmacology*
  • Animals
  • Benzodiazepines / chemical synthesis*
  • Benzodiazepines / chemistry*
  • Benzodiazepines / pharmacology*
  • Crystallography, X-Ray
  • Dose-Response Relationship, Drug
  • Drug Design
  • HEK293 Cells
  • Humans
  • Models, Molecular
  • Pyrroles / chemical synthesis
  • Pyrroles / chemistry
  • Pyrroles / pharmacology
  • Rabbits
  • Structure-Activity Relationship


  • Angiotensin-Converting Enzyme Inhibitors
  • Pyrroles
  • Benzodiazepines