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Hydrolysis of 2-oxoquazepam in alkaline solution
1Department of Pharmacology, F. Edward Hebert School of Medicine, Uniformed Services, University of the Health Sciences, Bethesda, MD 20814-4799.
Journal of Pharmaceutical Sciences
|January 1, 1994
Summary
The hydrolysis of 2-Oxoquazepam (OQZ), a quazepam metabolite, yields a sodium salt via acid-base equilibrium and ring-opening. This study details the hydrolysis kinetics and reaction mechanism using HPLC and MS.
Area of Science:
- Pharmaceutical Chemistry
- Chemical Kinetics
- Analytical Chemistry
Background:
- 2-Oxoquazepam (OQZ) is a key active metabolite of quazepam.
- Understanding OQZ hydrolysis is crucial for its metabolism and stability studies.
Purpose of the Study:
- To elucidate the hydrolysis mechanism of 2-Oxoquazepam (OQZ).
- To determine the kinetics of OQZ hydrolysis under various conditions.
- To identify and characterize the hydrolysis product.
Main Methods:
- Hydrolysis of OQZ in NaOH solution.
- Isolation and identification of the hydrolysis product using reversed-phase HPLC, UV-vis absorption, and MS.
- Kinetic studies of the hydrolysis reaction in acetonitrile/water mixtures.
Main Results:
- OQZ hydrolysis forms a sodium salt of a glycine derivative via acid-base equilibrium and a rate-determining ring-opening reaction.
- The reaction mechanism involves two negatively charged ions in the rate-determining step.
- Kinetic analysis yielded an activation energy of 14.4 kcal/mol at 25°C in a specific solvent system.
Conclusions:
- The hydrolysis pathway of OQZ involves distinct acid-base and ring-opening steps.
- Detailed kinetic parameters provide insights into the reaction mechanism and stability of OQZ.
- The identified hydrolysis product and reaction kinetics are important for understanding OQZ's fate.