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Adrenergic Agonists: Therapeutic Uses01:30

Adrenergic Agonists: Therapeutic Uses

Adrenergic agonists have diverse therapeutic uses across various medical conditions and emergencies.
Emergency and Intensive Care Unit (ICU) applications: Pressor agents increase blood pressure, heart rate, and contractility in shock and organ failure situations. Dopamine can induce vasodilation and stimulate adrenoceptors. Endogenous catecholamines are effective in treating cardiogenic shock. α2-agonists like clonidine can reverse anesthesia-induced hypertension.
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Reproductive Techniques for Ovarian Monitoring and Control in Amphibians
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Published on: May 12, 2019

Ergometrinine.

Stefan Merkel1, Robert Köppen, Matthias Koch

  • 1BAM Federal Institute for Materials Research and Testing, Department Analytical Chemistry, Reference Materials, Richard-Willstätter-Strasse 11, D-12489 Berlin-Adlershof, Germany.

Acta Crystallographica. Section E, Structure Reports Online
|May 19, 2011
PubMed
Summary

The absolute configuration of ergometrinine was determined using epimerization and HPLC. Structural analysis revealed specific conformations of its ergoline skeleton and hydrogen bonding patterns.

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Area of Science:

  • Organic Chemistry
  • Structural Chemistry
  • Pharmacology

Background:

  • Ergometrine and ergometrinine are ergot alkaloids with pharmacological significance.
  • Determining the absolute configuration of complex molecules is crucial for understanding their biological activity.

Purpose of the Study:

  • To establish the absolute configuration of ergometrinine.
  • To elucidate the three-dimensional structure and conformation of the ergoline skeleton in ergometrinine.

Main Methods:

  • Epimerization reaction of ergometrine to form ergometrinine.
  • Preparative High-Performance Liquid Chromatography (HPLC) for purification.
  • X-ray crystallography or computational modeling for structural analysis (implied by conformational description).

Main Results:

  • The absolute configuration of ergometrinine was successfully established.
  • Ring C of the ergoline skeleton exhibits an envelope conformation, being nearly planar.
  • Ring D displays a distorted chair conformation, stabilized by an intramolecular N-H⋯N hydrogen bond.
  • The crystal structure reveals undulating layers formed by intermolecular O-H⋯O and N-H⋯O hydrogen bonds.

Conclusions:

  • The study provides definitive structural information on ergometrinine.
  • Understanding the conformation and hydrogen bonding is vital for its chemical and pharmacological properties.
  • This work contributes to the knowledge of ergot alkaloid stereochemistry.