Photocatalytic routes to heterocycles with detailed mechanistic and sustainability coverage

Photocatalytic Synthesis of Heterocyclic Compounds connects traditional and photocatalytic approaches to heterocycle formation, addressing the demand for greener synthetic methodologies in pharmaceuticals, agrochemicals, and materials science.

This book covers photophysical and photochemical fundamentals underlying photoredox catalysis, it then examines radical and ionic pathways using both metal-based and metal-free catalysts. Synthetic coverage spans five-membered, six-membered, and fused heterocyclic systems. Methodologies emphasizing atom economy, reduced energy consumption, and minimal environmental impact are presented alongside discussion of current challenges and future directions in the field.

Key topics include:

• Mechanistic analysis of photoredox catalytic cycles relevant to nitrogen-, oxygen-, and sulfur-containing heterocycle formation under visible light conditions
• Comparative evaluation of metal-based and metal-free photocatalyst systems for efficient heterocyclic ring construction via radical and ionic pathways
• Green chemistry methodologies prioritizing atom economy, reduced energy input, and minimized waste generation in heterocycle synthesis
• Applications of photocatalytic-synthesized heterocycles in pharmaceutical development, agrochemical design, and advanced materials science
• Assessment of current limitations and future research directions for scaling photocatalytic heterocycle synthesis toward practical implementation

Synthetic organic chemists, medicinal chemists, and materials scientists seeking sustainable routes to heterocyclic scaffolds will find this volume a valuable resource. By consolidating photocatalytic strategies across heterocycle classes, it serves researchers and industry professionals advancing green chemistry in heterocyclic compound production.

Preface

- Importance of heterocycles in chemistry and biology

- Role of photocatalysis in green and sustainable chemistry

- Scope and objective of the book

Section I: Heterocyclic Compounds and Their Importance

1. Importance of Heterocycles in Modern Applications

2. Challenges in the Synthesis of Heterocycles

Section II: Introduction to Photocatalysis

3. Overview of Photocatalysis in Organic Synthesis

4. History and Principles of Light-driven Reactions in Organic Synthesis

5. Photophysical and Photochemical Process of Heterocyclic Compounds

6. Types of Photocatalysts: Application in Heterocycle Synthesis

7. Mechanism of Photocatalysis

8. Investigation of Photocatalytic Mechanism Through Computational and Spectroscopic Approaches

Section III: Photocatalytic Pathways for Heterocyclic Synthesis

9. Radical and Ionic Pathways in Heterocyclic Formation

10. Functionalization of Pre-existing Heterocycles Using Photoredox Catalysis

11. Metal-catalyzed Annulation Reactions for the Construction of Heterocycles Using para-Quinone Methides

12. Metal-free Photocatalyst for Heterocycle Synthesis

Section IV: Photocatalytic Synthesis of Five- and Six-membered Heterocycles

13. Photocatalytic Synthesis of Five-membered Heterocycles Containing One Hetero Atom

14. Photocatalytic Synthesis of Six-membered Heterocycles Containing One Hetero Atom

15. Photocatalytic Synthesis of Six-membered Heterocycles Containing More Than One Hetero Atom

Section V: Photocatalytic Synthesis of Fused and Polycyclic Heterocycles

16. Photocatalytic Synthesis of Fused N-heterocycles

17. Photocatalytic Synthesis of O-fused Heterocycles

18. Visible Light-promoted Photocatalytic C(sp2)-H Functionalization of Coumarins

Section VI: Sustainable aspects of photocatalysis

19. Green Chemistry Principles in Photocatalyzed Synthesis of Heterocycles

20. Photocatalysis for Energy Efficiency -Waste Management, Atom Economy, and Energy-efficient Technologies in Photocatalysis

21. Photocatalysis in Chemical Engineering and Continuous Flow Technologies for Heterocycle Synthesis

22. Photocatalytic Technologies for Sustainable Waste Management and Solar Energy Conversion

Section VII: Conclusion

23. Future Scope and Challenges: Scalability of Photocatalytic Reactions

24. Compatibility of Photocatalyst with Diverse Substrates

25. Challenges and Future Scope of Photocatalysis