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Oral hypoglycemic agents. Pyrimido[1,2-a]indoles and related compounds
I A Cliffe1, E L Lien, H L Mansell
1Department of Medicinal Chemistry, Wyeth Research, Maidenhead, Berkshire, England.
Journal of Medicinal Chemistry
|April 3, 1992
Summary
Researchers synthesized pyrimido[1,2-a]indoles and tested their hypoglycemic activity in rats. The most effective compounds featured 3,3-dimethyl or 3,3-spirocyclohexane substituents on the 10-hydroxypyrimido[1,2-a]indole core structure.
Area of Science:
- Medicinal Chemistry
- Pharmacology
- Organic Synthesis
Background:
- Pyrimido[1,2-a]indoles represent a class of heterocyclic compounds with potential biological activities.
- Exploring structure-activity relationships is crucial for developing novel therapeutic agents.
Purpose of the Study:
- To synthesize and evaluate the hypoglycemic activity of novel pyrimido[1,2-a]indole derivatives.
- To investigate the impact of various substituents at the 10- and 3,3-positions on hypoglycemic potency.
Main Methods:
- Synthesis of a series of pyrimido[1,2-a]indole analogues.
- Oral administration of compounds at 100 mg/kg to fed rats to assess hypoglycemic effects.
- Dose-response studies to determine relative potencies of active compounds.
Main Results:
- 10-Hydroxypyrimido[1,2-a]indoles with 3,3-dimethyl or 3,3-spirocyclohexane substituents exhibited significant hypoglycemic activity.
- Compounds 21, 22, 38 (3,3-dimethyl) and 39, 49 (3,3-spirocyclohexane) were identified as the most potent.
- 10-Aminopyrimido[1,2-a]indoles were generally less active, with potency decreasing upon derivatization of the amino group.
Conclusions:
- The 3,3-disubstitution pattern is critical for potent hypoglycemic activity in 10-hydroxypyrimido[1,2-a]indoles.
- Further derivatization of the 10-amino group in related analogues reduces efficacy.
- This study identifies promising lead compounds for further development as hypoglycemic agents.