Spirocyclic derivatives as antioxidants: a review

Area of Science:

• Medicinal Chemistry
• Organic Chemistry
• Pharmacology

Background:

• Oxidative stress is implicated in numerous diseases, including cancer, diabetes, and neurodegenerative disorders.
• Antioxidant drug development is crucial for managing oxidative stress-related conditions.
• Spiro compounds are versatile molecules with structural similarities to key pharmacophores, making them promising drug candidates.

Purpose of the Study:

• To provide a comprehensive overview of the synthesis of spiro compounds.
• To review the diverse antioxidant activities of naturally occurring and synthetic spiro compounds.
• To identify potent spiro compounds with significant antioxidant properties for further drug development.

Main Methods:

• Literature review of spiro compound synthesis.
• Analysis of various antioxidant assays including DPPH, ABTS, FRAP, anti-LPO, superoxide, xanthine oxidase, peroxide, hydroxyl, and nitric oxide.
• Evaluation of structure-activity relationships based on functional groups present in active compounds.

Main Results:

• Several spiro compounds (G14, C12, D41, C18, C15, D5, D11, E1, C14) demonstrated potent antioxidant activities across multiple assays.
• Most active compounds contained oxygen atoms, with 35% being phenolic compounds.
• Aryl ethers and nitrogen-containing functional groups (amines, amides) were also found in active spiro compounds lacking phenolic groups.

Conclusions:

• Spiro compounds possess significant antioxidant potential, offering a promising scaffold for developing novel therapeutic agents.
• The presence of oxygen-containing functional groups, particularly phenolic moieties, is associated with enhanced antioxidant activity.
• Further research into spiro compounds could lead to effective treatments for diseases driven by oxidative stress.