Visible Light Photocatalysis in Organic Chemistry

Author: Corey R.J. Stephenson   Tehshik P. Yoon   David W.C. MacMillan  

Publisher: John Wiley & Sons Inc‎

Publication year: 2018

E-ISBN: 9783527674176

P-ISBN(Paperback): 9783527335602

Subject: O644.11 Photochemical reaction.

Language: ENG

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Chapter

1.9 Designing Photocatalysts: [Ru(bpy)3]2+ as a Starting Point

1.10 Conclusion

References

Chapter 2 Visible-Light-Mediated Free Radical Synthesis

2.1 Introduction

2.2 Basics of the Photocatalytic Cycle

2.3 Generation of Radicals

2.3.1 Formation of C-Centered Radicals

2.3.1.1 Dehalogenation (I, Br, Cl)

2.3.1.2 Other C-Heteroatom Cleavage

2.3.1.3 C-C Bond Cleavage

2.3.2 Formation of N-Centered Radicals

2.4 C-X Bond Formation

2.4.1 C-O Bond

2.4.2 C-N Bond

2.4.3 C-S and C-Se Bonds

2.4.4 C-Br Bond

2.4.5 C-F Bond

2.4.6 C-B Bond

2.5 C-C Bond Formation

2.5.1 Formation and Reactivity of Aryl Radicals

2.5.2 Formation and Reactivity of Trifluoromethyl and Related Radicals

2.5.2.1 Photocatalyzed Reduction of Perfluorohalogen Derivatives

2.5.2.2 Photocatalyzed Reduction of Perfluoroalkyl-Substituted Onium Salts

2.5.2.3 Photocatalyzed Formation of Perfluoroalkyl Radicals from Sulfonyl and Sulfinyl Derivatives

2.5.3 Formation and Reactivity of Alkyl and Related Radicals

2.5.3.1 C-C Bond Formation Through Photocatalyzed Reduction of Halogen Derivatives and Analogs

2.5.3.2 C-C Bond Formation Through Photocatalyzed Oxidation of Electron-Rich Functional Group

2.5.3.3 C-C Bond Formation Through Photocatalyzed Oxidation of Amino Group

2.6 Radical Cascade Applications

2.6.1 Intramolecular Polycyclization Processes

2.6.2 Sequential Inter- and Intramolecular Processes

2.6.3 Sequential Radical and Polar Processes

References

Chapter 3 Atom Transfer Radical Addition using Photoredox Catalysis

3.1 Introduction

3.2 Transition Metal-Catalyzed ATRA

3.2.1 Ruthenium- and Iridium-Based ATRA

3.2.1.1 Mechanistic Investigations

3.2.1.2 Ruthenium- and Iridium-Based ATRA

3.2.2 Copper-Mediated ATRA

3.2.2.1 Trifluoromethylation

3.3 Other Photocatalysts for ATRA Transformations

3.3.1 p-Anisaldehyde

3.4 Semiconductor

3.5 Atom Transfer Radical Cyclization (ATRC)

3.6 Atom Transfer Radical Polymerization (ATRP)

3.7 Conclusion

References

Chapter 4 Visible Light Mediated 𝛂-Amino C-H Functionalization Reactions

4.1 Introduction

4.2 Visible Light Mediated 𝛂-Amino C-H Functionalization Via Iminium Ions

4.2.1 Aza-Henry Reaction

4.2.2 Mannich Reaction

4.2.3 Strecker Reaction

4.2.4 Friedel–Crafts Reaction

4.2.5 Alkynylation Reaction

4.2.6 Phosphonation Reaction

4.2.7 Addition of 1,3-Dicarbonyls

4.2.8 Formation of C-N and C-O Bonds

4.2.9 Miscellaneous

4.3 Visible Light Mediated a-Amino C-H Functionalization Via a-Amino Radicals

4.3.1 Addition to Electron-Deficient Aromatics

4.3.2 Addition to Electron-Deficient Alkenes

4.3.3 Miscellaneous

4.4 Conclusions and Perspectives

References

Chapter 5 Visible Light Mediated Cycloaddition Reactions

5.1 Introduction

5.2 [2+2] Cycloadditions: Formation of Four-Membered Rings

5.2.1 Introduction to [2+2] Cycloadditions

5.2.2 Utilization of the Reductive Quenching Cycle

5.2.3 Utilization of the Oxidative Quenching Cycle

5.2.4 Utilization of Energy Transfer

5.2.5 [2+2] Conclusion

5.3 [3+2] Cycloadditions: Formation of Five-Membered Rings

5.3.1 Introduction to [3+2] Cycloadditions

5.3.2 [3+2] Cycloaddition of Cyclopropylamines

5.3.3 1,3-Dipolar Cycloaddition of Azomethine Ylides

5.3.4 [3+2] Cycloaddition of Aryl Cyclopropyl Ketones

5.3.5 [3+2] Cycloaddition via ATRA/ATRC

5.3.6 [3+2] Conclusion

5.4 [4+2] Cycloadditions: Formation of Six-Membered Rings

5.4.1 Introduction to [4+2] Cycloadditions

5.4.2 [4+2] Cycloadditions Using Radical Anions

5.4.3 [4+2] Cycloadditions Using Radical Cations

5.4.4 [4+2] Conclusion

5.5 Conclusion

References

Chapter 6 Metal-Free Photo(redox) Catalysis

6.1 Introduction

6.1.1 Background

6.1.2 Classes of Organic Photocatalysts

6.2 Applications of Organic Photocatalysts

6.2.1 Energy Transfer Reactions

6.2.2 Reductive Quenching of the Catalyst

6.2.2.1 Cyanoarenes

6.2.2.2 Quinones

6.2.2.3 Cationic Dyes: Pyrylium, Quinolinium, and Acridinium Scaffolds

6.2.2.4 Xanthene Dyes and Further Aromatic Scaffolds

6.2.3 Oxidative Quenching of the Catalyst

6.2.4 New Developments

6.2.4.1 Upconversion

6.2.4.2 Consecutive Photoelectron Transfer

6.2.4.3 Multicatalysis

6.3 Conclusion and Outlook

References

Chapter 7 Visible Light and Copper Complexes: A Promising Match in Photoredox Catalysis

7.1 Introduction

7.2 Photophysical Properties of Copper Catalysts

7.3 Application of Copper Based Photocatalysts in Organic Synthesis

7.4 Outlook

Acknowledgment

References

Chapter 8 Arene Functionalization by Visible Light Photoredox Catalysis

8.1 Introduction

8.1.1 Aryl Diazonium Salts

8.1.2 Diaryl Iodonium Salts

8.1.3 Triaryl Sulfonium Salts

8.1.4 Aryl Sulfonyl Chlorides

8.2 Applications of Aryl Diazonium Salts

8.3 Photoinduced Ullmann C-N Coupling

8.4 Conclusion

References

Chapter 9 Visible-Light Photocatalysis in the Synthesis of Natural Products

References

Chapter 10 Dual Photoredox Catalysis: The Merger of Photoredox Catalysis with Other Catalytic Activation Modes

10.1 Introduction

10.2 Merger of Photoredox Catalysis with Organocatalysis

10.3 Merger of Photoredox Catalysis with Acid Catalysis

10.3.1 Photoredox Catalysis and Brønsted Acid Catalysis

10.3.2 Photoredox Catalysis and Lewis Acid Catalysis

10.4 Merger of Photoredox Catalysis with Transition Metal Catalysis

10.5 Conclusions

References

Chapter 11 Enantioselective Photocatalysis

11.1 Introduction

11.2 The Twentieth Century: Pioneering Work

11.3 The Twenty-First Century: Contemporary Developments

11.3.1 Large-Molecule Chiral Hosts

11.3.2 Small-Molecule Chiral Photosensitizers

11.3.3 Lewis Acid-Mediated Photoreactions

11.4 Conclusions and Outlook

References

Chapter 12 Photomediated Controlled Polymerizations

12.1 Catalyst Activation by Light

12.1.1 Cu-Catalyzed Photoregulated Atom Transfer Radical Polymerizations (photoATRP)

12.1.2 Photomediated ATRP with Non-Copper-Based Catalyst Systems

12.1.3 Iodine-Mediated Photopolymerizations

12.1.4 Metal-Free Photomediated Ring-Opening Metathesis Polymerization

12.1.5 Photoregulated Reversible-Addition Fragmentation Chain Transfer Polymerizations (photoRAFT)

12.2 Chain-End Activation by Light

12.3 Conclusions

References

Chapter 13 Accelerating Visible-Light Photoredox Catalysis in Continuous-Flow Reactors

13.1 Introduction

13.2 Homogeneous Photocatalysis in Single-Phase Flow

13.3 Gas–liquid Photocatalysis in Flow

13.4 Heterogeneous Photocatalysis in Flow

13.5 Conclusions

Conflict of Interest

References

Chapter 14 The Application of Visible-Light-Mediated Reactions to the Synthesis of Pharmaceutical Compounds

14.1 Introduction

14.2 Asymmetric Benzylation

14.3 Amide Bond Formation

14.4 C-H Azidation

14.5 Visible-Light-Mediated Benzothiophene Synthesis

14.6 a-Amino Radical Functionalization

14.7 Visible-Light-Mediated Radical Smiles Rearrangement

14.8 Photoredox and Nickel Dual Catalysis

14.9 The Scale-Up of Visible-Light-Mediated Reactions Via Continuous Processing

References

Index

EULA

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