51
|
Liu S, Jie J, Yu J, Yang X. Visible light induced Trifluoromethyl Migration: Easy Access to α-Trifluoromethylated Ketones from Enol Triflates. Adv Synth Catal 2017. [DOI: 10.1002/adsc.201701051] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Shuyang Liu
- Institute of Catalysis for Energy and Environment; College of Chemistry & Chemical Engineering; Shenyang Normal University; Shenyang Liaoning 110034 People's Republic of China
| | - Jiyang Jie
- Institute of Catalysis for Energy and Environment; College of Chemistry & Chemical Engineering; Shenyang Normal University; Shenyang Liaoning 110034 People's Republic of China
| | - Jipan Yu
- Key Laboratory of Nuclear Radiation and Nuclear Energy Technology; Key Laboratory for Biomedical Effects of Nanomaterials and Nanosafety; Institute of High Energy Physics; Chinese Academy of Sciences; Beijing 100049 People's Republic of China
| | - Xiaobo Yang
- Institute of Catalysis for Energy and Environment; College of Chemistry & Chemical Engineering; Shenyang Normal University; Shenyang Liaoning 110034 People's Republic of China
| |
Collapse
|
52
|
Khaled MB, El Mokadem RK, Weaver JD. Hydrogen Bond Directed Photocatalytic Hydrodefluorination: Overcoming Electronic Control. J Am Chem Soc 2017; 139:13092-13101. [PMID: 28837319 PMCID: PMC6069595 DOI: 10.1021/jacs.7b06847] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Abstract
The photocatalytic C-F functionalization of highly fluorinated arenes is a powerful method for accessing functionalized multifluorinated arenes. The decisive step in the determining regioselectivity in fluorine functionalization is fluoride fragmentation from the radical anion of the multifluorinated arene. To date, the availability of regioisomers has been dictated by the innate electronics of the fluorinated arene, limiting the synthetic utility of the chemistry. This study investigates the remarkable ability of a strategically located hydrogen bond to transcend the normal regioselectivity of the C-F functionalization event. A significant rate acceleration is additionally observed for hydrodefluorination of fluorines that can undergo intramolecular hydrogen bonds that form 5-8-membered cycles with moderately acidic N-H's. The hydrogen bond is expected to facilitate the fragmentation not only by bending the C-F bond of the radical anion out of planarity but also by increasing the exothermicity of the fluoride extrusion step through protonation of the naked fluoride. Finally, the synthetic utility of the method is demonstrated in an expedited synthesis of the trifluorinated α-phenyl acetic acid derivative required for the commercial synthesis of Januvia, an antidiabetic drug. This represents the first synthesis of a commercially important multifluorinated arene via a defluorination strategy and is significantly shorter than the current strategy.
Collapse
Affiliation(s)
- Mohammad B. Khaled
- Department of Chemistry, Oklahoma State University, Stillwater, OK 74078
| | | | - Jimmie D. Weaver
- Department of Chemistry, Oklahoma State University, Stillwater, OK 74078
| |
Collapse
|
53
|
Chaudhary R, Natarajan P. Visible Light Photoredox Activation of Sulfonyl Chlorides: Applications in Organic Synthesis. ChemistrySelect 2017. [DOI: 10.1002/slct.201701156] [Citation(s) in RCA: 57] [Impact Index Per Article: 8.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Affiliation(s)
- Renu Chaudhary
- Department of Chemistry & Centre for Advanced Studies in Chemistry; Panjab University; Chandigarh - 160 014 India
| | - Palani Natarajan
- Department of Chemistry & Centre for Advanced Studies in Chemistry; Panjab University; Chandigarh - 160 014 India
| |
Collapse
|
54
|
Xu X, Chen H, He J, Xu H. Copper-Catalysed Decarboxylative Trifluoromethylation of β
-Ketoacids. CHINESE J CHEM 2017. [DOI: 10.1002/cjoc.201700271] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Xiaolan Xu
- School of Chemistry and Chemical Engineering; Hefei University of Technology; Hefei Anhui 230009 China
- School of Medical Science; Anhui Medical University; Hefei Anhui 230009 China
| | - Huanhuan Chen
- School of Chemistry and Chemical Engineering; Hefei University of Technology; Hefei Anhui 230009 China
| | - Jianbo He
- School of Chemistry and Chemical Engineering; Hefei University of Technology; Hefei Anhui 230009 China
| | - Huajian Xu
- School of Chemistry and Chemical Engineering; Hefei University of Technology; Hefei Anhui 230009 China
| |
Collapse
|
55
|
A facile and environment-friendly method for fabrication of polymer brush. CHINESE JOURNAL OF POLYMER SCIENCE 2017. [DOI: 10.1007/s10118-017-1934-5] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
|
56
|
Yajima T, Ikegami M. Metal-Free Visible-Light Radical Iodoperfluoroalkylation of Terminal Alkenes and Alkynes. European J Org Chem 2017. [DOI: 10.1002/ejoc.201700077] [Citation(s) in RCA: 54] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Affiliation(s)
- Tomoko Yajima
- Department of Chemistry; Ochanomizu University; 2-1-1 Otuska, Bunkyo-ku 112-8610 Tokyo Japan
| | - Mako Ikegami
- Department of Chemistry; Ochanomizu University; 2-1-1 Otuska, Bunkyo-ku 112-8610 Tokyo Japan
| |
Collapse
|
57
|
Corsico S, Fagnoni M, Ravelli D. Sunlight decatungstate photoinduced trifluoromethylations of (hetero)aromatics and electron-poor olefins. Photochem Photobiol Sci 2017; 16:1375-1380. [DOI: 10.1039/c7pp00179g] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Tetrabutylammonium decatungstate has been exploited as a photoredox catalyst for the trifluoromethylation of (hetero)aromatics and electron-poor olefins.
Collapse
Affiliation(s)
- Sara Corsico
- PhotoGreen Lab
- Department of Chemistry
- University of Pavia
- 27100 Pavia
- Italy
| | - Maurizio Fagnoni
- PhotoGreen Lab
- Department of Chemistry
- University of Pavia
- 27100 Pavia
- Italy
| | - Davide Ravelli
- PhotoGreen Lab
- Department of Chemistry
- University of Pavia
- 27100 Pavia
- Italy
| |
Collapse
|
58
|
Abstract
In recent years, photoredox catalysis using eosin Y has come to the fore front in organic chemistry as a powerful strategy for the activation of small molecules.
Collapse
Affiliation(s)
- Vishal Srivastava
- Department of Chemistry
- United College of Engineering & Management
- Allahabad-211010
- India
| | - Praveen P. Singh
- Department of Chemistry
- United College of Engineering & Research
- Allahabad-211010
- India
| |
Collapse
|
59
|
Cantillo D, Kappe CO. Halogenation of organic compounds using continuous flow and microreactor technology. REACT CHEM ENG 2017. [DOI: 10.1039/c6re00186f] [Citation(s) in RCA: 63] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
Halogenation reactions involving highly reactive halogenating agents can be performed safely and with improved efficiency and selectivity under continuous flow conditions.
Collapse
Affiliation(s)
- David Cantillo
- Institute of Chemistry
- University of Graz
- Graz
- Austria
- Research Center Pharmaceutical Engineering GmbH (RCPE)
| | - C. Oliver Kappe
- Institute of Chemistry
- University of Graz
- Graz
- Austria
- Research Center Pharmaceutical Engineering GmbH (RCPE)
| |
Collapse
|
60
|
Su X, Huang H, Yuan Y, Li Y. Radical Desulfur‐Fragmentation and Reconstruction of Enol Triflates: Facile Access to α‐Trifluoromethyl Ketones. Angew Chem Int Ed Engl 2016. [DOI: 10.1002/ange.201608507] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Affiliation(s)
- Xiaolong Su
- Department of Chemistry Fuzhou University Fuzhou 350116 China
| | - Honggui Huang
- Department of Chemistry Fuzhou University Fuzhou 350116 China
| | - Yaofeng Yuan
- Department of Chemistry Fuzhou University Fuzhou 350116 China
| | - Yi Li
- Department of Chemistry Fuzhou University Fuzhou 350116 China
| |
Collapse
|
61
|
Su X, Huang H, Yuan Y, Li Y. Radical Desulfur‐Fragmentation and Reconstruction of Enol Triflates: Facile Access to α‐Trifluoromethyl Ketones. Angew Chem Int Ed Engl 2016; 56:1338-1341. [DOI: 10.1002/anie.201608507] [Citation(s) in RCA: 56] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2016] [Indexed: 12/23/2022]
Affiliation(s)
- Xiaolong Su
- Department of Chemistry Fuzhou University Fuzhou 350116 China
| | - Honggui Huang
- Department of Chemistry Fuzhou University Fuzhou 350116 China
| | - Yaofeng Yuan
- Department of Chemistry Fuzhou University Fuzhou 350116 China
| | - Yi Li
- Department of Chemistry Fuzhou University Fuzhou 350116 China
| |
Collapse
|
62
|
Monteiro JL, Carneiro PF, Elsner P, Roberge DM, Wuts PGM, Kurjan KC, Gutmann B, Kappe CO. Continuous Flow Homolytic Aromatic Substitution with Electrophilic Radicals: A Fast and Scalable Protocol for Trifluoromethylation. Chemistry 2016; 23:176-186. [DOI: 10.1002/chem.201604579] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2016] [Indexed: 01/14/2023]
Affiliation(s)
- Júlia L. Monteiro
- Institute of Chemistry; University of Graz, NAWI Graz; Heinrichstrasse 28 8010 Graz Austria
| | - Paula F. Carneiro
- Institute of Chemistry; University of Graz, NAWI Graz; Heinrichstrasse 28 8010 Graz Austria
| | - Petteri Elsner
- Chemical Manufacturing Technologies; Lonza AG; 3930 Visp Switzerland
| | | | - Peter G. M. Wuts
- Kalexsyn, Inc.; 4502 Campus Drive Kalamazoo MI 49008 USA
- Wuts Chemistry Consulting; 5287 Saddle Club Drive Kalamazoo MI 49009 USA
| | | | - Bernhard Gutmann
- Institute of Chemistry; University of Graz, NAWI Graz; Heinrichstrasse 28 8010 Graz Austria
- Research Center Pharmaceutical Engineering (RCPE); Inffeldgasse 13 8010 Graz Austria
| | - C. Oliver Kappe
- Institute of Chemistry; University of Graz, NAWI Graz; Heinrichstrasse 28 8010 Graz Austria
- Research Center Pharmaceutical Engineering (RCPE); Inffeldgasse 13 8010 Graz Austria
| |
Collapse
|
63
|
Mizuno K, Nishiyama Y, Ogaki T, Terao K, Ikeda H, Kakiuchi K. Utilization of microflow reactors to carry out synthetically useful organic photochemical reactions. JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY C-PHOTOCHEMISTRY REVIEWS 2016. [DOI: 10.1016/j.jphotochemrev.2016.10.002] [Citation(s) in RCA: 62] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
|
64
|
Yu W, Xu XH, Qing FL. Photoredox Catalysis Mediated Application of Methyl Fluorosulfonyldifluoroacetate as the CF2CO2R Radical Source. Org Lett 2016; 18:5130-5133. [DOI: 10.1021/acs.orglett.6b02580] [Citation(s) in RCA: 65] [Impact Index Per Article: 8.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Wei Yu
- Key
Laboratory of Organofluorine Chemistry, Shanghai Institute of Organic
Chemistry, Chinese Academy of Science, 345 Lingling Lu, Shanghai 200032, China
| | - Xiu-Hua Xu
- Key
Laboratory of Organofluorine Chemistry, Shanghai Institute of Organic
Chemistry, Chinese Academy of Science, 345 Lingling Lu, Shanghai 200032, China
| | - Feng-Ling Qing
- Key
Laboratory of Organofluorine Chemistry, Shanghai Institute of Organic
Chemistry, Chinese Academy of Science, 345 Lingling Lu, Shanghai 200032, China
- College
of Chemistry, Chemical Engineering and Biotechnology, Donghua University, 2999 North Renmin Lu, Shanghai 201620, China
| |
Collapse
|
65
|
Wei G, Basheer C, Tan CH, Jiang Z. Visible light photocatalysis in chemoselective functionalization of C(sp 3 ) H bonds enabled by organic dyes. Tetrahedron Lett 2016. [DOI: 10.1016/j.tetlet.2016.07.032] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
|
66
|
Rohokale RS, Koenig B, Dhavale DD. Synthesis of 2,4,6-Trisubstituted Pyridines by Oxidative Eosin Y Photoredox Catalysis. J Org Chem 2016; 81:7121-6. [DOI: 10.1021/acs.joc.6b00979] [Citation(s) in RCA: 61] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Affiliation(s)
- Rajendra S. Rohokale
- Garware
Research Centre, Department of Chemistry, Savitribai Phule Pune University (formerly University of Pune), Pune 411007, India
| | - Burkhard Koenig
- Institute
fuer Organische Chemie, Universitaet Regensburg, Universitatstrasse 31, 93053 Regensburg, Germany
| | - Dilip D. Dhavale
- Garware
Research Centre, Department of Chemistry, Savitribai Phule Pune University (formerly University of Pune), Pune 411007, India
| |
Collapse
|
67
|
Adib M, Pashazadeh R, Rajai-Daryasarei S, Mirzaei P, Jamal Addin Gohari S. Metal-free cross-dehydrogenative coupling of aryl aldehydes to give symmetrical carboxylic anhydrides promoted by the TBHP/nBu4PBr system. Tetrahedron Lett 2016. [DOI: 10.1016/j.tetlet.2016.05.069] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
|
68
|
Affiliation(s)
- Nathan A. Romero
- Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599-3290, United States
| | - David A. Nicewicz
- Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599-3290, United States
| |
Collapse
|
69
|
Cai S, Xu Y, Chen D, Li L, Chen Q, Huang M, Weng W. Visible-Light-Enabled Decarboxylative Sulfonylation of Cinnamic Acids with Sulfonylhydrazides under Transition-Metal-Free Conditions. Org Lett 2016; 18:2990-3. [PMID: 27268708 DOI: 10.1021/acs.orglett.6b01353] [Citation(s) in RCA: 94] [Impact Index Per Article: 11.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
Decarboxylative cross-coupling reactions of cinnamic acids with sulfonylhydrazides were explored using oxygen as the sole terminal oxidant, realizing a conceptually novel technology for vinyl sulfone synthesis under the synergistic interactions of visible light irradiation, organic dye-type photocatalyst eosin Y, KI, and Cs2CO3 at room temperature.
Collapse
Affiliation(s)
- Shunyou Cai
- Key Laboratory of Modern Analytical Science and Separation Technology of Fujian Province, School of Chemistry and Environment, Minnan Normal University , Zhangzhou 363000, China.,Key Laboratory of Chemical Genomics, School of Chemical Biology and Biotechnology, Shenzhen Graduate School, Peking University , Shenzhen 518055, China
| | - Yaohui Xu
- Key Laboratory of Modern Analytical Science and Separation Technology of Fujian Province, School of Chemistry and Environment, Minnan Normal University , Zhangzhou 363000, China
| | - Danling Chen
- Key Laboratory of Modern Analytical Science and Separation Technology of Fujian Province, School of Chemistry and Environment, Minnan Normal University , Zhangzhou 363000, China
| | - Lihuang Li
- Key Laboratory of Modern Analytical Science and Separation Technology of Fujian Province, School of Chemistry and Environment, Minnan Normal University , Zhangzhou 363000, China
| | - Qifa Chen
- Key Laboratory of Modern Analytical Science and Separation Technology of Fujian Province, School of Chemistry and Environment, Minnan Normal University , Zhangzhou 363000, China
| | - Mingqiang Huang
- Key Laboratory of Modern Analytical Science and Separation Technology of Fujian Province, School of Chemistry and Environment, Minnan Normal University , Zhangzhou 363000, China
| | - Wen Weng
- Key Laboratory of Modern Analytical Science and Separation Technology of Fujian Province, School of Chemistry and Environment, Minnan Normal University , Zhangzhou 363000, China
| |
Collapse
|
70
|
Chandrasekhar D, Borra S, Nanubolu JB, Maurya RA. Visible Light Driven Photocascade Catalysis: Ru(bpy)3(PF6)2/TBHP-Mediated Synthesis of Fused β-Carbolines in Batch and Flow Microreactors. Org Lett 2016; 18:2974-7. [PMID: 27226119 DOI: 10.1021/acs.orglett.6b01321] [Citation(s) in RCA: 49] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
1,2,3,4-Tetrahydro-β-carbolines were coupled with α-keto vinyl azides through an unprecedented visible light-Ru(bpy)3(PF6)2/TBHP mediated photocascade strategy that involves photosensitization, photoredox catalysis and [3 + 2] cycloaddition reaction. The scope and scale-up feasibility of the photocascade strategy was demonstrated by synthesizing 18 different fused β-carbolines in moderate to good yields using batch and continuous flow microreactor. This operationally simple synthetic protocol allows the formation of one C-C and two C-N new bonds in the overall transformation.
Collapse
Affiliation(s)
| | | | | | - Ram Awatar Maurya
- Chemical Science and Technology Division, CSIR-North East Institute of Science and Technology , Jorhat, Assam 785006, India
| |
Collapse
|
71
|
Chachignon H, Maeno M, Kondo H, Shibata N, Cahard D. Novel Use of CF3SO2Cl for the Metal-Free Electrophilic Trifluoromethylthiolation. Org Lett 2016; 18:2467-70. [DOI: 10.1021/acs.orglett.6b01026] [Citation(s) in RCA: 97] [Impact Index Per Article: 12.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Hélène Chachignon
- UMR
6014 CNRS COBRA, Normandie Université, INSA Rouen, 1 rue Tesnière, 76821 Mont Saint Aignan, France
| | - Mayaka Maeno
- UMR
6014 CNRS COBRA, Normandie Université, INSA Rouen, 1 rue Tesnière, 76821 Mont Saint Aignan, France
- Department
of Nanopharmaceutical Sciences, Nagoya Institute of Technology, Gokiso, Showa-ku, Nagoya 466-8555, Japan
| | - Hiroya Kondo
- Department
of Nanopharmaceutical Sciences, Nagoya Institute of Technology, Gokiso, Showa-ku, Nagoya 466-8555, Japan
| | - Norio Shibata
- Department
of Nanopharmaceutical Sciences, Nagoya Institute of Technology, Gokiso, Showa-ku, Nagoya 466-8555, Japan
| | - Dominique Cahard
- UMR
6014 CNRS COBRA, Normandie Université, INSA Rouen, 1 rue Tesnière, 76821 Mont Saint Aignan, France
| |
Collapse
|
72
|
Ravelli D, Protti S, Fagnoni M. Carbon–Carbon Bond Forming Reactions via Photogenerated Intermediates. Chem Rev 2016; 116:9850-913. [DOI: 10.1021/acs.chemrev.5b00662] [Citation(s) in RCA: 724] [Impact Index Per Article: 90.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Affiliation(s)
- Davide Ravelli
- Department
of Chemistry, Photogreen Lab, University of Pavia, Viale Taramelli
12, 27100 Pavia, Italy
| | - Stefano Protti
- Department
of Chemistry, Photogreen Lab, University of Pavia, Viale Taramelli
12, 27100 Pavia, Italy
| | - Maurizio Fagnoni
- Department
of Chemistry, Photogreen Lab, University of Pavia, Viale Taramelli
12, 27100 Pavia, Italy
| |
Collapse
|
73
|
Yi N, Zhang H, Xu C, Deng W, Wang R, Peng D, Zeng Z, Xiang J. Copper/Silver Cocatalyzed Oxidative Coupling of Vinylarenes with ICH2CF3 or ICH2CHF2 Leading to β-CF3/CHF2-Substituted Ketones. Org Lett 2016; 18:1780-3. [DOI: 10.1021/acs.orglett.6b00498] [Citation(s) in RCA: 40] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Niannian Yi
- State
Key Laboratory of Chemo/Biosensing and Chemometrics, College of Chemistry
and Chemical Engineering, Hunan University, Changsha, 410082, P. R. China
| | - Hao Zhang
- State
Key Laboratory of Chemo/Biosensing and Chemometrics, College of Chemistry
and Chemical Engineering, Hunan University, Changsha, 410082, P. R. China
| | - Chonghui Xu
- State
Key Laboratory of Chemo/Biosensing and Chemometrics, College of Chemistry
and Chemical Engineering, Hunan University, Changsha, 410082, P. R. China
| | - Wei Deng
- State
Key Laboratory of Chemo/Biosensing and Chemometrics, College of Chemistry
and Chemical Engineering, Hunan University, Changsha, 410082, P. R. China
| | - Ruijia Wang
- State
Key Laboratory of Chemo/Biosensing and Chemometrics, College of Chemistry
and Chemical Engineering, Hunan University, Changsha, 410082, P. R. China
| | - Dongming Peng
- School
of Pharmacy, Hunan University of Chinese Medicine, Changsha, 410208, P. R. China
| | - Zebing Zeng
- State
Key Laboratory of Chemo/Biosensing and Chemometrics, College of Chemistry
and Chemical Engineering, Hunan University, Changsha, 410082, P. R. China
| | - Jiannan Xiang
- State
Key Laboratory of Chemo/Biosensing and Chemometrics, College of Chemistry
and Chemical Engineering, Hunan University, Changsha, 410082, P. R. China
| |
Collapse
|
74
|
Cambié D, Bottecchia C, Straathof NJW, Hessel V, Noël T. Applications of Continuous-Flow Photochemistry in Organic Synthesis, Material Science, and Water Treatment. Chem Rev 2016; 116:10276-341. [PMID: 26935706 DOI: 10.1021/acs.chemrev.5b00707] [Citation(s) in RCA: 882] [Impact Index Per Article: 110.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
Continuous-flow photochemistry in microreactors receives a lot of attention from researchers in academia and industry as this technology provides reduced reaction times, higher selectivities, straightforward scalability, and the possibility to safely use hazardous intermediates and gaseous reactants. In this review, an up-to-date overview is given of photochemical transformations in continuous-flow reactors, including applications in organic synthesis, material science, and water treatment. In addition, the advantages of continuous-flow photochemistry are pointed out and a thorough comparison with batch processing is presented.
Collapse
Affiliation(s)
- Dario Cambié
- Department of Chemical Engineering and Chemistry, Micro Flow Chemistry and Process Technology, Eindhoven University of Technology , Den Dolech 2, 5600 MB Eindhoven, The Netherlands
| | - Cecilia Bottecchia
- Department of Chemical Engineering and Chemistry, Micro Flow Chemistry and Process Technology, Eindhoven University of Technology , Den Dolech 2, 5600 MB Eindhoven, The Netherlands
| | - Natan J W Straathof
- Department of Chemical Engineering and Chemistry, Micro Flow Chemistry and Process Technology, Eindhoven University of Technology , Den Dolech 2, 5600 MB Eindhoven, The Netherlands
| | - Volker Hessel
- Department of Chemical Engineering and Chemistry, Micro Flow Chemistry and Process Technology, Eindhoven University of Technology , Den Dolech 2, 5600 MB Eindhoven, The Netherlands
| | - Timothy Noël
- Department of Chemical Engineering and Chemistry, Micro Flow Chemistry and Process Technology, Eindhoven University of Technology , Den Dolech 2, 5600 MB Eindhoven, The Netherlands.,Department of Organic Chemistry, Ghent University , Krijgslaan 281 (S4), 9000 Ghent, Belgium
| |
Collapse
|
75
|
Yayla HG, Peng F, Mangion IK, McLaughlin M, Campeau LC, Davies IW, DiRocco DA, Knowles RR. Discovery and mechanistic study of a photocatalytic indoline dehydrogenation for the synthesis of elbasvir. Chem Sci 2016; 7:2066-2073. [PMID: 29899932 PMCID: PMC5968518 DOI: 10.1039/c5sc03350k] [Citation(s) in RCA: 86] [Impact Index Per Article: 10.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2015] [Accepted: 11/27/2015] [Indexed: 12/14/2022] Open
Abstract
Elbasvir is a potent NS5A antagonist for the treatment of chronic hepatitis C. A seemingly trivial indoline oxidation en route to the target compound was complicated by epimerization of a stereogenic hemiaminal center under most standard oxidation conditions. To address this issue, a novel visible light photoredox process for indoline oxidation was developed involving an iridium photosensitizer and environmentally-benign perester oxidant. The reaction was discovered through a high-throughput experimentation campaign and the optimized process was demonstrated on 100 g scale in flow to afford a key intermediate towards the target compound. A battery of kinetic, electrochemical, and spectroscopic studies of this process indicates a radical chain mechanism of dehydrogenation involving selective HAT from the substrate by an alkoxy radicals. Notably, isotope effects were used to validate the chain mechanism when quantum yield data proved ambiguous.
Collapse
Affiliation(s)
- Hatice G Yayla
- Department of Chemistry , Princeton University , Princeton , New Jersey 08544 , USA .
| | - Feng Peng
- Department of Process Chemistry , Merck & Co., Inc. Rahway , New Jersey 07065 , USA .
| | - Ian K Mangion
- Department of Process Chemistry , Merck & Co., Inc. Rahway , New Jersey 07065 , USA .
| | - Mark McLaughlin
- Department of Process Chemistry , Merck & Co., Inc. Rahway , New Jersey 07065 , USA .
| | - Louis-Charles Campeau
- Department of Process Chemistry , Merck & Co., Inc. Rahway , New Jersey 07065 , USA .
| | - Ian W Davies
- Department of Process Chemistry , Merck & Co., Inc. Rahway , New Jersey 07065 , USA .
| | - Daniel A DiRocco
- Department of Process Chemistry , Merck & Co., Inc. Rahway , New Jersey 07065 , USA .
| | - Robert R Knowles
- Department of Chemistry , Princeton University , Princeton , New Jersey 08544 , USA .
| |
Collapse
|
76
|
Wang J, Nguyen TH, Zheng N. Photoredox-catalyzed [4+2] annulation of cyclobutylanilines with alkenes, alkynes, and diynes in continuous flow. Sci China Chem 2016. [DOI: 10.1007/s11426-015-5547-y] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
|
77
|
Cai S, Chen D, Xu Y, Weng W, Li L, Zhang R, Huang M. Visible-light-promoted syntheses of β-keto sulfones from alkynes and sulfonylhydrazides. Org Biomol Chem 2016; 14:4205-9. [DOI: 10.1039/c6ob00617e] [Citation(s) in RCA: 60] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
Functionalized β-keto sulfones were prepared under the synergistic interactions of visible light irradiation, Ru(bpy)3Cl2, oxygen, KI, and NaOAc basic additive.
Collapse
Affiliation(s)
- Shunyou Cai
- School of Chemistry and Environment
- Fujian Provincial Key Laboratory of Modern Analytical Science and Separation Technology
- Minnan Normal University
- Zhangzhou
- China
| | - Danling Chen
- School of Chemistry and Environment
- Fujian Provincial Key Laboratory of Modern Analytical Science and Separation Technology
- Minnan Normal University
- Zhangzhou
- China
| | - Yaohui Xu
- School of Chemistry and Environment
- Fujian Provincial Key Laboratory of Modern Analytical Science and Separation Technology
- Minnan Normal University
- Zhangzhou
- China
| | - Wen Weng
- School of Chemistry and Environment
- Fujian Provincial Key Laboratory of Modern Analytical Science and Separation Technology
- Minnan Normal University
- Zhangzhou
- China
| | - Lihuang Li
- School of Chemistry and Environment
- Fujian Provincial Key Laboratory of Modern Analytical Science and Separation Technology
- Minnan Normal University
- Zhangzhou
- China
| | - Ruijie Zhang
- School of Chemistry and Environment
- Fujian Provincial Key Laboratory of Modern Analytical Science and Separation Technology
- Minnan Normal University
- Zhangzhou
- China
| | - Mingqiang Huang
- School of Chemistry and Environment
- Fujian Provincial Key Laboratory of Modern Analytical Science and Separation Technology
- Minnan Normal University
- Zhangzhou
- China
| |
Collapse
|
78
|
Yu W, Xu XH, Qing FL. Visible light-induced monofluoromethylenation of heteroarenes with ethyl bromofluoroacetate. NEW J CHEM 2016. [DOI: 10.1039/c6nj00281a] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A mild approach for the direct introduction of an ethoxycarbonylmonofluoromethyl group into heteroarenes via visible light photocatalysis has been developed.
Collapse
Affiliation(s)
- Wei Yu
- Key Laboratory of Organofluorine Chemistry
- Shanghai Institute of Organic Chemistry
- Chinese Academy of Science
- Shanghai 200032
- China
| | - Xiu-Hua Xu
- Key Laboratory of Organofluorine Chemistry
- Shanghai Institute of Organic Chemistry
- Chinese Academy of Science
- Shanghai 200032
- China
| | - Feng-Ling Qing
- Key Laboratory of Organofluorine Chemistry
- Shanghai Institute of Organic Chemistry
- Chinese Academy of Science
- Shanghai 200032
- China
| |
Collapse
|
79
|
Yang T, Zhu H, Yu W. Copper-catalyzed radical reactions of 2-azido-N-arylacrylamides with 1-(trifluoromethyl)-1,2-benziodoxole and 1-azidyl-1,2-benziodoxole. Org Biomol Chem 2016; 14:3376-84. [DOI: 10.1039/c6ob00226a] [Citation(s) in RCA: 38] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
The tandem addition/cyclization reactions of 2-azido-N-arylacrylamides with 1-(trifluoromethyl)-1,2-benziodoxole and 1-azidyl-1,2-benziodoxole-derived trifluoromethyl radicals and azidyl radicals were investigated.
Collapse
Affiliation(s)
- Tonghao Yang
- State Key Laboratory of Applied Organic Chemistry
- College of Chemistry and Chemical Engineering
- Lanzhou University
- Lanzhou 730000
- China
| | - Haizhen Zhu
- State Key Laboratory of Applied Organic Chemistry
- College of Chemistry and Chemical Engineering
- Lanzhou University
- Lanzhou 730000
- China
| | - Wei Yu
- State Key Laboratory of Applied Organic Chemistry
- College of Chemistry and Chemical Engineering
- Lanzhou University
- Lanzhou 730000
- China
| |
Collapse
|
80
|
Banaszak-Léonard E, Mangin F, Len C. Barton decarboxylation under ultrasonic continuous flow. NEW J CHEM 2016. [DOI: 10.1039/c6nj01368f] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
Barton decarboxylation was performed in ultrasonic continuous flow for bulkier syntheses and enhanced yields compared to conventional heating.
Collapse
Affiliation(s)
- Estelle Banaszak-Léonard
- Ecole Supérieure de Chimie Organique et Minérale
- EA 4297 Transformations Intégrées de la Matière Renouvelable
- F-60200 Compiègne
- France
| | - Floriane Mangin
- Sorbonne Universités
- Université de Technologie de Compiègne
- EA 4297 Transformations Intégrées de la Matière Renouvelable
- Centre de Recherche Royallieu
- F-60203 Compiègne cedex
| | - Christophe Len
- Sorbonne Universités
- Université de Technologie de Compiègne
- EA 4297 Transformations Intégrées de la Matière Renouvelable
- Centre de Recherche Royallieu
- F-60203 Compiègne cedex
| |
Collapse
|
81
|
Okusu S, Hirano K, Yasuda Y, Tokunaga E, Shibata N. Flow trifluoromethylation of carbonyl compounds by Ruppert–Prakash reagent and its application for pharmaceuticals, efavirenz and HSD-016. RSC Adv 2016. [DOI: 10.1039/c6ra19790f] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Flow trifluoromethylation of carbonyl compounds using the Ruppert–Prakash reagent, Me3SiCF3 is disclosed including enantioselective trifluoromethylation. Synthesis of pharmaceuticals, efavirenz and HSD-016 were achieved by this flow method.
Collapse
Affiliation(s)
- Satoshi Okusu
- Department of Nanopharmaceutical Sciences & Department of Frontier Materials
- Nagoya Institute of Technology
- Nagoya 466-8555
- Japan
| | - Kazuki Hirano
- Department of Nanopharmaceutical Sciences & Department of Frontier Materials
- Nagoya Institute of Technology
- Nagoya 466-8555
- Japan
| | - Yoshimasa Yasuda
- Department of Nanopharmaceutical Sciences & Department of Frontier Materials
- Nagoya Institute of Technology
- Nagoya 466-8555
- Japan
| | - Etsuko Tokunaga
- Department of Nanopharmaceutical Sciences & Department of Frontier Materials
- Nagoya Institute of Technology
- Nagoya 466-8555
- Japan
| | - Norio Shibata
- Department of Nanopharmaceutical Sciences & Department of Frontier Materials
- Nagoya Institute of Technology
- Nagoya 466-8555
- Japan
| |
Collapse
|
82
|
Visible-light-promoted cyclodesulfurization of phenolic thioureas: an organophotoredox catalytic approach to 2-aminobenzoxazoles. Tetrahedron Lett 2016. [DOI: 10.1016/j.tetlet.2015.11.089] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
|
83
|
Lin QY, Xu XH, Zhang K, Qing FL. Visible-Light-Induced Hydrodifluoromethylation of Alkenes with a Bromodifluoromethylphosphonium Bromide. Angew Chem Int Ed Engl 2015. [DOI: 10.1002/ange.201509282] [Citation(s) in RCA: 50] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Qing-Yu Lin
- KeyLaboratory of Organofluorine Chemistry; Shanghai Institute of Organic Chemistry; Chinese Academy of Science; 345 Lingling Lu Shanghai 200032 China
| | - Xiu-Hua Xu
- KeyLaboratory of Organofluorine Chemistry; Shanghai Institute of Organic Chemistry; Chinese Academy of Science; 345 Lingling Lu Shanghai 200032 China
| | - Ke Zhang
- College of Chemistry, Chemical Engineering and Biotechnology; Donghua University; 2999 North Renmin Lu Shanghai 201620 China
| | - Feng-Ling Qing
- KeyLaboratory of Organofluorine Chemistry; Shanghai Institute of Organic Chemistry; Chinese Academy of Science; 345 Lingling Lu Shanghai 200032 China
- College of Chemistry, Chemical Engineering and Biotechnology; Donghua University; 2999 North Renmin Lu Shanghai 201620 China
| |
Collapse
|
84
|
Lin QY, Xu XH, Zhang K, Qing FL. Visible-Light-Induced Hydrodifluoromethylation of Alkenes with a Bromodifluoromethylphosphonium Bromide. Angew Chem Int Ed Engl 2015; 55:1479-83. [DOI: 10.1002/anie.201509282] [Citation(s) in RCA: 181] [Impact Index Per Article: 20.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2015] [Revised: 11/17/2015] [Indexed: 11/11/2022]
Affiliation(s)
- Qing-Yu Lin
- KeyLaboratory of Organofluorine Chemistry; Shanghai Institute of Organic Chemistry; Chinese Academy of Science; 345 Lingling Lu Shanghai 200032 China
| | - Xiu-Hua Xu
- KeyLaboratory of Organofluorine Chemistry; Shanghai Institute of Organic Chemistry; Chinese Academy of Science; 345 Lingling Lu Shanghai 200032 China
| | - Ke Zhang
- College of Chemistry, Chemical Engineering and Biotechnology; Donghua University; 2999 North Renmin Lu Shanghai 201620 China
| | - Feng-Ling Qing
- KeyLaboratory of Organofluorine Chemistry; Shanghai Institute of Organic Chemistry; Chinese Academy of Science; 345 Lingling Lu Shanghai 200032 China
- College of Chemistry, Chemical Engineering and Biotechnology; Donghua University; 2999 North Renmin Lu Shanghai 201620 China
| |
Collapse
|
85
|
Suzuki I, Esumi N, Yasuda M. Photoredox α-Allylation of α-Halocarbonyls with Allylboron Compounds Accelerated by Fluoride Salts under Visible Light Irradiation. ASIAN J ORG CHEM 2015. [DOI: 10.1002/ajoc.201500475] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Itaru Suzuki
- Department of Applied Chemistry; Graduate School of Engineering; Osaka University; 2-1 Yamada-oka, Suita Osaka 565-0871 Japan
| | - Naoto Esumi
- Department of Applied Chemistry; Graduate School of Engineering; Osaka University; 2-1 Yamada-oka, Suita Osaka 565-0871 Japan
| | - Makoto Yasuda
- Department of Applied Chemistry; Graduate School of Engineering; Osaka University; 2-1 Yamada-oka, Suita Osaka 565-0871 Japan
| |
Collapse
|
86
|
Tiwari DK, Maurya RA, Nanubolu JB. Visible-Light/Photoredox-Mediated sp3
CH Functionalization and Coupling of Secondary Amines with Vinyl Azides in Flow Microreactors. Chemistry 2015; 22:526-30. [DOI: 10.1002/chem.201504292] [Citation(s) in RCA: 46] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2015] [Indexed: 01/09/2023]
|
87
|
Rehm TH. Photochemical Fluorination Reactions - A Promising Research Field for Continuous-Flow Synthesis. Chem Eng Technol 2015. [DOI: 10.1002/ceat.201500195] [Citation(s) in RCA: 40] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
|
88
|
Wang B, Xiong DC, Ye XS. Direct C–H Trifluoromethylation of Glycals by Photoredox Catalysis. Org Lett 2015; 17:5698-701. [DOI: 10.1021/acs.orglett.5b03016] [Citation(s) in RCA: 40] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Affiliation(s)
- Bang Wang
- State
Key Laboratory of Natural and Biomimetic Drugs, School of Pharmaceutical
Sciences, and Center for Molecular and Translational Medicine, Peking University, Xue Yuan Road No. 38, Beijing 100191, China
| | - De-Cai Xiong
- State
Key Laboratory of Natural and Biomimetic Drugs, School of Pharmaceutical
Sciences, and Center for Molecular and Translational Medicine, Peking University, Xue Yuan Road No. 38, Beijing 100191, China
| | - Xin-Shan Ye
- State
Key Laboratory of Natural and Biomimetic Drugs, School of Pharmaceutical
Sciences, and Center for Molecular and Translational Medicine, Peking University, Xue Yuan Road No. 38, Beijing 100191, China
| |
Collapse
|
89
|
Li J, Wang DZ. Visible-Light-Promoted Photoredox Syntheses of α,β-Epoxy Ketones from Styrenes and Benzaldehydes under Alkaline Conditions. Org Lett 2015; 17:5260-3. [DOI: 10.1021/acs.orglett.5b02629] [Citation(s) in RCA: 60] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Affiliation(s)
- Jing Li
- Laboratory of Chemical Genomics,
School of Chemical Biology and Biotechnology, Shenzhen Graduate School of Peking University, Shenzhen 518055, China
| | - David Zhigang Wang
- Laboratory of Chemical Genomics,
School of Chemical Biology and Biotechnology, Shenzhen Graduate School of Peking University, Shenzhen 518055, China
| |
Collapse
|
90
|
Carbomethoxydifluoromethylation of enol acetates with methyl (chlorosulfonyl)difluoroacetate using visible-light photoredox catalysis. Synthesis of 2,2-difluoro-γ-ketoesters. J Fluor Chem 2015. [DOI: 10.1016/j.jfluchem.2015.07.018] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
|
91
|
Study for diastereoselective aldol reaction in flow: synthesis of (E)-(S)-3-hydroxy-7-tritylthio-4-heptenoic acid, a key component of cyclodepsipeptide HDAC inhibitors. Tetrahedron 2015. [DOI: 10.1016/j.tet.2015.05.051] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
|
92
|
Mitra S, Ghosh M, Mishra S, Hajra A. Metal-Free Thiocyanation of Imidazoheterocycles through Visible Light Photoredox Catalysis. J Org Chem 2015. [DOI: 10.1021/acs.joc.5b01369] [Citation(s) in RCA: 166] [Impact Index Per Article: 18.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Shubhanjan Mitra
- Department
of Chemistry, Visva-Bharati (A Central University), Santiniketan 731235, India
| | - Monoranjan Ghosh
- Department
of Chemistry, Visva-Bharati (A Central University), Santiniketan 731235, India
| | - Subhajit Mishra
- Department
of Chemistry, Visva-Bharati (A Central University), Santiniketan 731235, India
| | - Alakananda Hajra
- Department
of Chemistry, Visva-Bharati (A Central University), Santiniketan 731235, India
| |
Collapse
|
93
|
Angnes RA, Li Z, Correia CRD, Hammond GB. Recent synthetic additions to the visible light photoredox catalysis toolbox. Org Biomol Chem 2015; 13:9152-67. [PMID: 26242759 DOI: 10.1039/c5ob01349f] [Citation(s) in RCA: 171] [Impact Index Per Article: 19.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
The boom in visible light photoredox catalysis (VLPC) research has demonstrated that this novel synthetic approach is here to stay. VLPC enables reactive radical intermediates to be catalytically generated at ambient temperature, a feat not generally allowed through traditional pyrolysis- or radical initiator-based methodologies. VLPC has vastly extended the range of substrates and reaction schemes that have been traditionally the domain of radical reactions. In this review the photophysics background of VLPC will be briefly discussed, followed by a report on recent inroads of VLPC into decarboxylative couplings and radical C-H functionalization of aromatic compounds. The bulk of the review will be dedicated to advances in synergistic catalysis involving VLPC, namely the combination of photoredox catalysis with organocatalysis, including β-functionalization of carbonyl groups, functionalization of weak aliphatic C-H bonds, and anti-Markovnikov hydrofunctionalization of alkenes; dual catalysis with gold or with nickel, photoredox catalysis as an oxidation promoter in transition metal catalysis, and acid-catalyzed enantioselective radical addition to π systems.
Collapse
Affiliation(s)
- Ricardo A Angnes
- Chemistry Institute, State University of Campinas - Unicamp C.P. 6154, CEP. 13083-970, Campinas, São Paulo, Brazil
| | | | | | | |
Collapse
|
94
|
Lin QY, Xu XH, Qing FL. Visible light-induced selective hydrobromodifluoromethylation of alkenes with dibromodifluoromethane. Org Biomol Chem 2015; 13:8740-9. [PMID: 26185911 DOI: 10.1039/c5ob01302j] [Citation(s) in RCA: 66] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A visible light-induced selective hydrobromodifluoromethylation of alkenes using CF2Br2 was developed. This transformation proceeded smoothly in the presence of catalytic eosin Y at room temperature to give various hydrobromodifluoromethylated compounds with broad functional group tolerance.
Collapse
Affiliation(s)
- Qing-Yu Lin
- Key Laboratory of Organofluorine Chemistry, Shanghai Institute of Organic Chemistry, Chinese Academy of Science, Shanghai 200032, China.
| | | | | |
Collapse
|
95
|
|
96
|
Abstract
AbstractRadicals are easily generated via hydrogen transfer form secondary alcohols or tertiary amines using photochemical sensitization with ketones. They can subsequently add to the electron deficient double bond of furanones. The addition of the alcohols is particularly efficient. Therefore, this reaction was used to characterize and to compare the efficiency of different photochemical continuous flow microreactors. A range of micro-structured reactors were tested and their performances evaluated. The enclosed microchip enabled high space-time-yields but its microscopic dimensions limited its productivity. In contrast, the open microcapillary model showed a greater potential for scale-up and reactor optimization. A 10-microcapillary reactor was therefore constructed and utilized for typical R&D applications. Compared to the corresponding batch processes, the microreactor systems gave faster conversions, improved product qualities and higher yields. Similar reactions have also been carried out with electronically excited furanones and other α,β-unsaturated ketones. In this case, hydrogen is transferred directly to the excited olefin. This reaction part may occur either in one step, i.e., electron and proton are transferred simultaneously, or it may occur in two steps, i.e., the electron is transferred first and the proton follows. In the first case, a C–C bond is formed in the α position of the α,β-unsaturated carbonyl compound and in the second case this bond is formed in the β position. For the first reaction, the influence of stereochemical elements of the substrate on the regioselectivity of the hydrogen abstraction on the side chain has been studied.
Collapse
Affiliation(s)
- Michael Oelgemöller
- 1College of Science, Technology and Engineering, James Cook University, Townsville, QLD 4811, Australia
| | - Norbert Hoffmann
- 2CNRS, Université de Reims Champagne-Ardenne, ICMR, Equipe de Photochimie, UFR Sciences, B.P. 1039, 51687 Reims, France
| |
Collapse
|
97
|
Liu C, Zhao W, Huang Y, Wang H, Zhang B. Light-induced BiOBr nanosheets accelerated highly regioselective intermolecular trifluoromethylation/arylation of alkenes to synthesize CF3-containing aza-heterocycles. Tetrahedron 2015. [DOI: 10.1016/j.tet.2015.04.056] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
|
98
|
Hari DP, König B. Synthetic applications of eosin Y in photoredox catalysis. Chem Commun (Camb) 2015; 50:6688-99. [PMID: 24699920 DOI: 10.1039/c4cc00751d] [Citation(s) in RCA: 715] [Impact Index Per Article: 79.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
Eosin Y, a long known dye molecule, has recently been widely applied as a photoredox catalyst in organic synthesis. Low cost and good availability make eosin Y an attractive alternative to typical inorganic transition metal photocatalysts. We summarize the key photophysical properties of the dye and the recent synthetic applications in photoredox catalysis.
Collapse
Affiliation(s)
- Durga Prasad Hari
- Department of Chemistry and Pharmacy, Universität Regensburg, Universitätsstr. 31, 93040 Regensburg, Germany.
| | | |
Collapse
|
99
|
Li J, Zhang J, Tan H, Wang DZ. Visible-Light-Promoted Vinylation of Tetrahydrofuran with Alkynes through Direct C-H Bond Functionalization. Org Lett 2015; 17:2522-5. [PMID: 25908495 DOI: 10.1021/acs.orglett.5b01053] [Citation(s) in RCA: 87] [Impact Index Per Article: 9.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Mild and direct C-H bond functionalizations and vinylations of tetrahydrofuran with alkynes have been accomplished through visible light photocatalysis, yielding a range of vinyl tetrahydrofurans under the synergistic actions of organic dye-type photocatalyst eosin Y, tert-butyl hydroperoxide (t-BuOOH), and a 45 W household lightbulb. A significant kinetic isotope effect (KIE) was recorded, which helps shed light on the mechanistic course.
Collapse
Affiliation(s)
- Jing Li
- Laboratory of Chemical Genomics, School of Chemical Biology and Biotechnology, Shenzhen Graduate School of Peking University, Shenzhen 518055, China
| | - Jing Zhang
- Laboratory of Chemical Genomics, School of Chemical Biology and Biotechnology, Shenzhen Graduate School of Peking University, Shenzhen 518055, China
| | - Haibo Tan
- Laboratory of Chemical Genomics, School of Chemical Biology and Biotechnology, Shenzhen Graduate School of Peking University, Shenzhen 518055, China
| | - David Zhigang Wang
- Laboratory of Chemical Genomics, School of Chemical Biology and Biotechnology, Shenzhen Graduate School of Peking University, Shenzhen 518055, China
| |
Collapse
|
100
|
Mandhapati AR, Kato T, Matsushita T, Ksebati B, Vasella A, Böttger EC, Crich D. Fluorine-decoupled carbon spectroscopy for the determination of configuration at fully substituted, trifluoromethyl- and perfluoroalkyl-bearing carbons: comparison with 19F-1H heteronuclear Overhauser effect spectroscopy. J Org Chem 2015; 80:1754-63. [PMID: 25561269 PMCID: PMC4320651 DOI: 10.1021/jo502677a] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2014] [Indexed: 01/17/2023]
Abstract
The synthesis of a series of α-trifluoromethylcyclohexanols and analogous trimethylsilyl ethers by addition of the Ruppert-Prakash reagent to substituted cyclohexanones is presented. A method for the assignment of configuration of such compounds, of related α-trifluoromethylcyclohexylamines and of quaternary trifluoromethyl-substituted carbons is described based on the determination of the (3)J(CH) coupling constant between the fluorine-decoupled (13)CF3 resonance and the vicinal hydrogens. This method is dubbed fluorine-decoupled carbon spectroscopy and abbreviated FDCS. The method is also applied to the configurational assignment of substances bearing mono-, di-, and perfluoroalkyl rather than trifluoromethyl groups. The configuration of all substances was verified by either (19)F-(1)H heteronuclear Overhauser spectroscopy (HOESY) or X-ray crystallography. The relative merits of FDCS and HOESY are compared and contrasted. (2)J(CH), (3)J(CH), and (4)J(CH) coupling constants to (19)F decoupled CF3 groups in alkenes and arenes have also been determined and should prove to be useful in the structural assignment of trifluoromethylated alkenes and arenes.
Collapse
Affiliation(s)
- Appi Reddy Mandhapati
- Department
of Chemistry, Wayne State University, Detroit, Michigan 48202, United States
| | - Takayuki Kato
- Department
of Chemistry, Wayne State University, Detroit, Michigan 48202, United States
| | - Takahiko Matsushita
- Department
of Chemistry, Wayne State University, Detroit, Michigan 48202, United States
| | - Bashar Ksebati
- Department
of Chemistry, Wayne State University, Detroit, Michigan 48202, United States
| | - Andrea Vasella
- Laboratorium
für Organische Chemie, ETH Zürich, 8093 Zürich, Switzerland
| | - Erik C. Böttger
- Institut
für Medizinische Mikrobiologie, Universität
Zürich, 8006 Zürich, Switzerland
| | - David Crich
- Department
of Chemistry, Wayne State University, Detroit, Michigan 48202, United States
| |
Collapse
|