Synthesis of Spirocyclic Indolenines

Area of Science:

• Organic Chemistry
• Synthetic Chemistry

Background:

• Spirocyclic indolenines are synthetically useful and biologically important scaffolds.
• Numerous synthetic methods have been developed over the past 77 years.

Purpose of the Study:

• To provide an in-depth review of spirocyclic indolenine synthesis.
• To categorize and discuss major synthetic strategies.

Main Methods:

• The review categorizes synthetic strategies into three main approaches:
• Interrupted Fischer indolisations
• Dearomatisation reactions of indoles
• Condensation reactions

Main Results:

• A wide array of diverse synthetic methods has been developed.
• The review examines the historical background, common synthetic challenges, and current state-of-the-art.
• Future perspectives in the field are also discussed.

Conclusions:

• The synthesis of spirocyclic indolenines is a dynamic field with a rich history.
• Continued development of synthetic strategies is expected.
• These scaffolds remain crucial in synthetic and medicinal chemistry.