51
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Lan Y, Fan P, Liu XW, Meng FF, Ahmad T, Xu YH, Loh TP. An iron-catalyzed hydroalkylation reaction of α,β-unsaturated ketones with ethers. Chem Commun (Camb) 2017; 53:12353-12356. [DOI: 10.1039/c7cc07235j] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A general strategy for the hydroalkylation of vinyl ketones using ethers catalyzed by an iron catalyst is described.
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Affiliation(s)
- Yun Lan
- Department of Chemistry
- University of Science and Technology of China
- Hefei
- P. R. China
| | - Pei Fan
- Department of Chemistry
- University of Science and Technology of China
- Hefei
- P. R. China
| | - Xiao-Wei Liu
- Department of Chemistry
- University of Science and Technology of China
- Hefei
- P. R. China
| | - Fei-Fan Meng
- Department of Chemistry
- University of Science and Technology of China
- Hefei
- P. R. China
| | - Tanveer Ahmad
- Department of Chemistry
- University of Science and Technology of China
- Hefei
- P. R. China
| | - Yun-He Xu
- Department of Chemistry
- University of Science and Technology of China
- Hefei
- P. R. China
| | - Teck-Peng Loh
- Department of Chemistry
- University of Science and Technology of China
- Hefei
- P. R. China
- Institute of Advanced Synthesis
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52
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Nauth AM, Lipp A, Lipp B, Opatz T. Sunflow: Sunlight Drives Fast and Green Photochemical Flow Reactions in Simple Microcapillary Reactors - Application to Photoredox and H-Atom-Transfer Chemistry. European J Org Chem 2016. [DOI: 10.1002/ejoc.201601394] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Alexander M. Nauth
- Institute of Organic Chemistry; Johannes Gutenberg University Mainz; 55128 Mainz Germany
| | - Alexander Lipp
- Institute of Organic Chemistry; Johannes Gutenberg University Mainz; 55128 Mainz Germany
| | - Benjamin Lipp
- Institute of Organic Chemistry; Johannes Gutenberg University Mainz; 55128 Mainz Germany
| | - Till Opatz
- Institute of Organic Chemistry; Johannes Gutenberg University Mainz; 55128 Mainz Germany
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53
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Cambié D, Zhao F, Hessel V, Debije MG, Noël T. A Leaf-Inspired Luminescent Solar Concentrator for Energy-Efficient Continuous-Flow Photochemistry. Angew Chem Int Ed Engl 2016; 56:1050-1054. [DOI: 10.1002/anie.201611101] [Citation(s) in RCA: 96] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2016] [Indexed: 01/06/2023]
Affiliation(s)
- Dario Cambié
- Department of Chemical Engineering and Chemistry, Micro Flow Chemistry & Process Technology; Eindhoven University of Technology; Den Dolech 2 5612 AZ Eindhoven The Netherlands
| | - Fang Zhao
- Department of Chemical Engineering and Chemistry, Micro Flow Chemistry & Process Technology; Eindhoven University of Technology; Den Dolech 2 5612 AZ Eindhoven The Netherlands
| | - Volker Hessel
- Department of Chemical Engineering and Chemistry, Micro Flow Chemistry & Process Technology; Eindhoven University of Technology; Den Dolech 2 5612 AZ Eindhoven The Netherlands
| | - Michael G. Debije
- Department of Chemical Engineering and Chemistry, Functional Organic Materials & Devices; Eindhoven University of Technology; Den Dolech 2 5612 AZ Eindhoven The Netherlands
| | - Timothy Noël
- Department of Chemical Engineering and Chemistry, Micro Flow Chemistry & Process Technology; Eindhoven University of Technology; Den Dolech 2 5612 AZ Eindhoven The Netherlands
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54
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Cambié D, Zhao F, Hessel V, Debije MG, Noël T. A Leaf-Inspired Luminescent Solar Concentrator for Energy-Efficient Continuous-Flow Photochemistry. Angew Chem Int Ed Engl 2016. [DOI: 10.1002/ange.201611101] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Affiliation(s)
- Dario Cambié
- Department of Chemical Engineering and Chemistry, Micro Flow Chemistry & Process Technology; Eindhoven University of Technology; Den Dolech 2 5612 AZ Eindhoven The Netherlands
| | - Fang Zhao
- Department of Chemical Engineering and Chemistry, Micro Flow Chemistry & Process Technology; Eindhoven University of Technology; Den Dolech 2 5612 AZ Eindhoven The Netherlands
| | - Volker Hessel
- Department of Chemical Engineering and Chemistry, Micro Flow Chemistry & Process Technology; Eindhoven University of Technology; Den Dolech 2 5612 AZ Eindhoven The Netherlands
| | - Michael G. Debije
- Department of Chemical Engineering and Chemistry, Functional Organic Materials & Devices; Eindhoven University of Technology; Den Dolech 2 5612 AZ Eindhoven The Netherlands
| | - Timothy Noël
- Department of Chemical Engineering and Chemistry, Micro Flow Chemistry & Process Technology; Eindhoven University of Technology; Den Dolech 2 5612 AZ Eindhoven The Netherlands
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55
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Ravelli D, Protti S, Fagnoni M. Decatungstate Anion for Photocatalyzed "Window Ledge" Reactions. Acc Chem Res 2016; 49:2232-2242. [PMID: 27648722 DOI: 10.1021/acs.accounts.6b00339] [Citation(s) in RCA: 189] [Impact Index Per Article: 23.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
The majority of organic reactions are commonly carried out inside a lab, under a fume hood. A particular case is that of photochemical reactions, a field where the pioneering experiments by Giacomo Ciamician demonstrated more than one century ago that different processes can be carried out outdoors, for example, on the balcony of his own department, upon exposure of the reacting mixtures to sunlight. The main problem related to this chemistry of the "window ledge" is that most organic compounds are colorless and their absorption in the solar light region is in most cases negligible. Recently, the impressive development in the use of visible light absorbing photocatalysts (e.g., RuII or IrIII complexes, as well as organic dyes) made light-induced processes convenient even for non-photochemistry practitioners. It is thus possible to easily perform the reactions by simply placing the reaction vessel in a sunny place outside the lab. However, most of these processes are based on single electron transfer (SET) reactions (photoredox catalysis). Other photocatalysts able to activate substrates via alternative paths, such as hydrogen atom transfer (HAT), are emerging. In the last years, we were deeply involved in the use of the decatungstate anion ([W10O32]4-, a polyoxometalate) in synthesis. Indeed, such a versatile species is able to promote the photocatalytic C-H activation of organic compounds via either SET or HAT reactions. Interestingly, though the absorption spectrum of [W10O32]4- does not extend into the visible region, it shows an overlap with solar light emission. In this Account, we provide an overview on the application of decatungstate salts as photocatalysts in window ledge chemistry. We initially discuss the nature of the photogenerated species involved in the mechanism of action of the anion, also supported by theoretical simulations. The first-formed excited state of the decatungstate anion decays rapidly to the active species, a dark state tagged wO, featuring the presence of electron-deficient oxygen centers. Next, we describe the main applications of decatungstate chemistry. A significant part of this Account is devoted to photocatalyzed synthesis (C-X bond formation, with X = C, N, O, and oxidations) carried out by adopting sunlight (or simulated solar light). This synthetic approach is versatile, and most of the reactions involved C-H activation in cycloalkanes, alkylaromatics, amides, ethers (1,4-dioxane, oxetane, benzodioxole, and THF), aldehydes, nitriles, and cyclopentanones, and the ensuing addition of the resulting radicals onto electron-deficient olefins. Finally, the increasing role of the decatungstate anion in water depollution and polymerization is briefly discussed.
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Affiliation(s)
- Davide Ravelli
- PhotoGreen
Lab, Department
of Chemistry, University of Pavia, Viale Taramelli 12, 27100 Pavia, Italy
| | - Stefano Protti
- PhotoGreen
Lab, Department
of Chemistry, University of Pavia, Viale Taramelli 12, 27100 Pavia, Italy
| | - Maurizio Fagnoni
- PhotoGreen
Lab, Department
of Chemistry, University of Pavia, Viale Taramelli 12, 27100 Pavia, Italy
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56
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Waele VD, Poizat O, Fagnoni M, Bagno A, Ravelli D. Unraveling the Key Features of the Reactive State of Decatungstate Anion in Hydrogen Atom Transfer (HAT) Photocatalysis. ACS Catal 2016. [DOI: 10.1021/acscatal.6b01984] [Citation(s) in RCA: 94] [Impact Index Per Article: 11.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Vincent De Waele
- Université de Lille, CNRS, UMR 8516, LASIR, Laboratoire
de Spectrochimie et Raman, F59000 Lille, France
| | - Olivier Poizat
- Université de Lille, CNRS, UMR 8516, LASIR, Laboratoire
de Spectrochimie et Raman, F59000 Lille, France
| | - Maurizio Fagnoni
- PhotoGreen
Lab, Department of Chemistry, University of Pavia, viale Taramelli
12, 27100 Pavia, Italy
| | - Alessandro Bagno
- Department
of Chemistry, University of Padova, via Marzolo 1, 35131 Padova, Italy
| | - Davide Ravelli
- PhotoGreen
Lab, Department of Chemistry, University of Pavia, viale Taramelli
12, 27100 Pavia, Italy
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57
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Kamijo S, Takao G, Kamijo K, Tsuno T, Ishiguro K, Murafuji T. Alkylation of Nonacidic C(sp3)–H Bonds by Photoinduced Catalytic Michael-Type Radical Addition. Org Lett 2016; 18:4912-4915. [DOI: 10.1021/acs.orglett.6b02391] [Citation(s) in RCA: 45] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Shin Kamijo
- Graduate School of Sciences and Technology for Innovation and ‡Department of
Biology and Chemistry, Yamaguchi University, Yamaguchi 753-8512, Japan
| | - Go Takao
- Graduate School of Sciences and Technology for Innovation and ‡Department of
Biology and Chemistry, Yamaguchi University, Yamaguchi 753-8512, Japan
| | - Kaori Kamijo
- Graduate School of Sciences and Technology for Innovation and ‡Department of
Biology and Chemistry, Yamaguchi University, Yamaguchi 753-8512, Japan
| | - Teruo Tsuno
- Graduate School of Sciences and Technology for Innovation and ‡Department of
Biology and Chemistry, Yamaguchi University, Yamaguchi 753-8512, Japan
| | - Katsuya Ishiguro
- Graduate School of Sciences and Technology for Innovation and ‡Department of
Biology and Chemistry, Yamaguchi University, Yamaguchi 753-8512, Japan
| | - Toshihiro Murafuji
- Graduate School of Sciences and Technology for Innovation and ‡Department of
Biology and Chemistry, Yamaguchi University, Yamaguchi 753-8512, Japan
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58
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Capaldo L, Buzzetti L, Merli D, Fagnoni M, Ravelli D. Smooth Photocatalyzed Benzylation of Electrophilic Olefins via Decarboxylation of Arylacetic Acids. J Org Chem 2016; 81:7102-9. [DOI: 10.1021/acs.joc.6b00984] [Citation(s) in RCA: 55] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Luca Capaldo
- PhotoGreen Lab, Department
of Chemistry, University of Pavia, Viale Taramelli 12, 27100 Pavia, Italy
| | - Luca Buzzetti
- PhotoGreen Lab, Department
of Chemistry, University of Pavia, Viale Taramelli 12, 27100 Pavia, Italy
| | - Daniele Merli
- PhotoGreen Lab, Department
of Chemistry, University of Pavia, Viale Taramelli 12, 27100 Pavia, Italy
| | - Maurizio Fagnoni
- PhotoGreen Lab, Department
of Chemistry, University of Pavia, Viale Taramelli 12, 27100 Pavia, Italy
| | - Davide Ravelli
- PhotoGreen Lab, Department
of Chemistry, University of Pavia, Viale Taramelli 12, 27100 Pavia, Italy
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59
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Oelgemöller M. Solar Photochemical Synthesis: From the Beginnings of Organic Photochemistry to the Solar Manufacturing of Commodity Chemicals. Chem Rev 2016; 116:9664-82. [PMID: 27181285 DOI: 10.1021/acs.chemrev.5b00720] [Citation(s) in RCA: 138] [Impact Index Per Article: 17.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
Natural sunlight offers a cost-efficient and sustainable energy source for photochemical reactions. In contrast to the lengthy and small-scale "flask in the sun" procedures of the past, modern solar concentrator systems nowadays significantly shorten reaction times and enable technical-scale operations. After a brief historical introduction, this review presents the most important solar reactor types and their successful application in preparative solar syntheses. The examples demonstrate that solar manufacturing of fine chemicals is technically feasible and environmentally sustainable. After over 100 years, Ciamician's prophetic vision of "the photochemistry of the future" as a clean and green manufacturing methodology has yet to be realized. At the same time, his warning "for nature is not in a hurry but mankind is" is still valid today. It is hoped that this review will lead to a renewed interest in this truly enlightening technology, that it will stimulate photochemists and photochemical engineers to "go back to the roots onto the roofs" and that it will ultimately result in industrial applications in the foreseeable future.
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Affiliation(s)
- Michael Oelgemöller
- College of Science and Engineering, James Cook University , Townsville, Queensland 4811, Australia
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60
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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
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61
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Nodwell MB, Bagai A, Halperin SD, Martin RE, Knust H, Britton R. Direct photocatalytic fluorination of benzylic C-H bonds with N-fluorobenzenesulfonimide. Chem Commun (Camb) 2016; 51:11783-6. [PMID: 26107990 DOI: 10.1039/c5cc04058b] [Citation(s) in RCA: 78] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
The late-stage fluorination of common synthetic building blocks and drug leads is an appealing reaction for medicinal chemistry. In particular, fluorination of benzylic C-H bonds provides a means to attenuate drug metabolism at this metabolically labile position. Here we report two complimentary strategies for the direct fluorination of benzylic C-H bonds using N-fluorobenzenesulfonimide and either a decatungstate photocatalyst or AIBN-initiation.
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Affiliation(s)
- Matthew B Nodwell
- Department of Chemistry, Simon Fraser University, Burnaby, British Columbia V5A1S6, Canada.
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62
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Selvakumar S, Sakamoto R, Maruoka K. Diastereoselective Radical Hydroacylation of Alkylidenemalonates with Aliphatic Aldehydes Initiated by Photolysis of Hypervalent Iodine(III) Reagents. Chemistry 2016; 22:6552-5. [PMID: 27097595 DOI: 10.1002/chem.201600425] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2016] [Indexed: 01/20/2023]
Abstract
Diastereoselective radical hydroacylation of chiral alkylidenemalonates with aliphatic aldehydes is realized by the combination of a hypervalent iodine(III) reagent and UV-light irradiation. The reaction is initiated by the photolysis of hypervalent iodine(III) reagents under mild, metal-free conditions, and is the first example of diastereoselective addition of acyl radicals to olefins to afford chiral ketones in a highly stereoselective fashion. The obtained optically active ketones are useful chiral synthons, as exemplified by the short formal synthesis of (-)-methyleneolactocin.
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Affiliation(s)
- Sermadurai Selvakumar
- Department of Chemistry, Graduate School of Science, Kyoto University, Sakyo, Kyoto, 606-8502, Japan), Fax: (+81)75-753-4041
| | - Ryu Sakamoto
- Department of Chemistry, Graduate School of Science, Kyoto University, Sakyo, Kyoto, 606-8502, Japan), Fax: (+81)75-753-4041
| | - Keiji Maruoka
- Department of Chemistry, Graduate School of Science, Kyoto University, Sakyo, Kyoto, 606-8502, Japan), Fax: (+81)75-753-4041.
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63
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Shi D, He C, Sun W, Ming Z, Meng C, Duan C. A photosensitizing decatungstate-based MOF as heterogeneous photocatalyst for the selective C–H alkylation of aliphatic nitriles. Chem Commun (Camb) 2016; 52:4714-7. [DOI: 10.1039/c6cc00862c] [Citation(s) in RCA: 42] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
A photosensitizing decatungstate-based MOF with 1D channels was achieved for light-driven the β- or γ-site C–H alkylation of aliphatic nitriles, which offered an environmental-friendly route in both the laboratory and industry.
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Affiliation(s)
- Dongying Shi
- State Key Laboratory of Fine Chemicals
- Dalian University of Technology
- Dalian 116024
- P. R. China
| | - Cheng He
- State Key Laboratory of Fine Chemicals
- Dalian University of Technology
- Dalian 116024
- P. R. China
| | - Wenlong Sun
- State Key Laboratory of Fine Chemicals
- Dalian University of Technology
- Dalian 116024
- P. R. China
| | - Zheng Ming
- State Key Laboratory of Fine Chemicals
- Dalian University of Technology
- Dalian 116024
- P. R. China
| | - Changgong Meng
- State Key Laboratory of Fine Chemicals
- Dalian University of Technology
- Dalian 116024
- P. R. China
| | - Chunying Duan
- State Key Laboratory of Fine Chemicals
- Dalian University of Technology
- Dalian 116024
- P. R. China
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64
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Shi D, Zeng L, Ming Z, He C, Meng C, Duan C. A breathing MOF: direct crystallographic observation of the site-selective C(sp3)–H functionalization. RSC Adv 2016. [DOI: 10.1039/c6ra07100g] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
A 3D breathing MOF was synthesized for light-driven acceleration of the site-selective C(sp3)–H activation. The 1D channels of the assembled MOF can encapsulate reaction substrates via a breathing process that were observed by single-crystal X-ray analyses.
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Affiliation(s)
- Dongying Shi
- State Key Laboratory of Fine Chemicals
- Dalian University of Technology
- Dalian 116024
- P. R. China
| | - Le Zeng
- State Key Laboratory of Fine Chemicals
- Dalian University of Technology
- Dalian 116024
- P. R. China
| | - Zheng Ming
- State Key Laboratory of Fine Chemicals
- Dalian University of Technology
- Dalian 116024
- P. R. China
| | - Cheng He
- State Key Laboratory of Fine Chemicals
- Dalian University of Technology
- Dalian 116024
- P. R. China
| | - Changgong Meng
- State Key Laboratory of Fine Chemicals
- Dalian University of Technology
- Dalian 116024
- P. R. China
| | - Chunying Duan
- State Key Laboratory of Fine Chemicals
- Dalian University of Technology
- Dalian 116024
- P. R. China
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65
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Bonassi F, Ravelli D, Protti S, Fagnoni M. Decatungstate Photocatalyzed Acylations and Alkylations in Flow viaHydrogen Atom Transfer. Adv Synth Catal 2015. [DOI: 10.1002/adsc.201500483] [Citation(s) in RCA: 51] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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66
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Halperin SD, Kwon D, Holmes M, Regalado EL, Campeau LC, DiRocco DA, Britton R. Development of a Direct Photocatalytic C–H Fluorination for the Preparative Synthesis of Odanacatib. Org Lett 2015; 17:5200-3. [DOI: 10.1021/acs.orglett.5b02532] [Citation(s) in RCA: 122] [Impact Index Per Article: 13.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Shira D. Halperin
- Department
of Chemistry, Simon Fraser University, Burnaby, British Columbia, Canada
| | - Daniel Kwon
- Department
of Chemistry, Simon Fraser University, Burnaby, British Columbia, Canada
| | - Michael Holmes
- Department
of Chemistry, Simon Fraser University, Burnaby, British Columbia, Canada
| | - Erik L. Regalado
- Department
of Process Chemistry, Merck Research Laboratories, Rahway, New Jersey, United States
| | - Louis-Charles Campeau
- Department
of Process Chemistry, Merck Research Laboratories, Rahway, New Jersey, United States
| | - Daniel A. DiRocco
- Department
of Process Chemistry, Merck Research Laboratories, Rahway, New Jersey, United States
| | - Robert Britton
- Department
of Chemistry, Simon Fraser University, Burnaby, British Columbia, Canada
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67
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Duret G, Quinlan R, Bisseret P, Blanchard N. Boron chemistry in a new light. Chem Sci 2015; 6:5366-5382. [PMID: 28717443 PMCID: PMC5502392 DOI: 10.1039/c5sc02207j] [Citation(s) in RCA: 109] [Impact Index Per Article: 12.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2015] [Accepted: 07/30/2015] [Indexed: 12/20/2022] Open
Abstract
Photocatalysis has recently opened up new avenues for the generation of radical species under visible light irradiation conditions. A particularly fascinating class of photocatalyzed transformations relies on the activation of stable boron species with visible-light since it allows the creation of boryl and/or carbon radicals through single electron transfer or energy transfer without the need for specific and costly equipment. This new paradigm has found numerous applications in synthetic organic chemistry, catalysis, and macromolecular chemistry. In this minireview, the concepts underlying photoactivation of boron-species as well as applications to the creation of C-H, C-C, C-O, B-C and B-S bond are discussed.
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Affiliation(s)
- Guillaume Duret
- Laboratoire de Chimie Moléculaire , Université de Strasbourg , CNRS UMR 7509 , ECPM , 25 rue Becquerel , 67087 Strasbourg , France . ;
| | - Robert Quinlan
- Laboratoire de Chimie Moléculaire , Université de Strasbourg , CNRS UMR 7509 , ECPM , 25 rue Becquerel , 67087 Strasbourg , France . ;
| | - Philippe Bisseret
- Laboratoire de Chimie Moléculaire , Université de Strasbourg , CNRS UMR 7509 , ECPM , 25 rue Becquerel , 67087 Strasbourg , France . ;
| | - Nicolas Blanchard
- Laboratoire de Chimie Moléculaire , Université de Strasbourg , CNRS UMR 7509 , ECPM , 25 rue Becquerel , 67087 Strasbourg , France . ;
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68
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Jiang J, Ramozzi R, Moteki S, Usui A, Maruoka K, Morokuma K. Mechanism of Metal-Free C–H Activation of Branched Aldehydes and Acylation of Alkenes Using Hypervalent Iodine Compound: A Theoretical Study. J Org Chem 2015; 80:9264-71. [DOI: 10.1021/acs.joc.5b01695] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Affiliation(s)
- Julong Jiang
- Fukui
Institute for Fundamental Chemistry, Kyoto University, Takano-Nishihiraki-cho
34-4, Kyoto 606-8103, Japan
| | - Romain Ramozzi
- Fukui
Institute for Fundamental Chemistry, Kyoto University, Takano-Nishihiraki-cho
34-4, Kyoto 606-8103, Japan
| | - Shin Moteki
- Department
of Chemistry, Graduate School of Science, Kyoto University, Kyoto 606-8502, Japan
| | - Asuka Usui
- Department
of Chemistry, Graduate School of Science, Kyoto University, Kyoto 606-8502, Japan
| | - Keiji Maruoka
- Department
of Chemistry, Graduate School of Science, Kyoto University, Kyoto 606-8502, Japan
| | - Keiji Morokuma
- Fukui
Institute for Fundamental Chemistry, Kyoto University, Takano-Nishihiraki-cho
34-4, Kyoto 606-8103, Japan
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69
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Okada M, Yamada K, Fukuyama T, Ravelli D, Fagnoni M, Ryu I. Photocatalytic One-Pot Synthesis of Homoallyl Ketones via a Norrish Type I Reaction of Cyclopentanones. J Org Chem 2015; 80:9365-9. [DOI: 10.1021/acs.joc.5b01850] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Megumi Okada
- Department
of Chemistry, Graduate School of Science, Osaka Prefecture University, Sakai, Osaka 599-8531, Japan
| | - Keiichi Yamada
- Department
of Chemistry, Graduate School of Science, Osaka Prefecture University, Sakai, Osaka 599-8531, Japan
| | - Takahide Fukuyama
- Department
of Chemistry, Graduate School of Science, Osaka Prefecture University, Sakai, Osaka 599-8531, Japan
| | - Davide Ravelli
- PhotoGreen
Lab, Department of Chemistry, University of Pavia, Viale Taramelli
12, 27100 Pavia, Italy
| | - Maurizio Fagnoni
- PhotoGreen
Lab, Department of Chemistry, University of Pavia, Viale Taramelli
12, 27100 Pavia, Italy
| | - Ilhyong Ryu
- Department
of Chemistry, Graduate School of Science, Osaka Prefecture University, Sakai, Osaka 599-8531, Japan
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70
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Qrareya H, Dondi D, Ravelli D, Fagnoni M. Decatungstate-Photocatalyzed Si−H/C−H Activation in Silyl Hydrides: Hydrosilylation of Electron-Poor Alkenes. ChemCatChem 2015. [DOI: 10.1002/cctc.201500562] [Citation(s) in RCA: 53] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Hisham Qrareya
- PhotoGreen Lab; Department of Chemistry; University of Pavia; Viale Taramelli 12 27100 Pavia Italy
| | - Daniele Dondi
- Department of Chemistry; University of Pavia; Viale Taramelli 12 27100 Pavia Italy
| | - Davide Ravelli
- PhotoGreen Lab; Department of Chemistry; University of Pavia; Viale Taramelli 12 27100 Pavia Italy
| | - Maurizio Fagnoni
- PhotoGreen Lab; Department of Chemistry; University of Pavia; Viale Taramelli 12 27100 Pavia Italy
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71
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Energy and molecules from photochemical/photocatalytic reactions. An overview. Molecules 2015; 20:1527-42. [PMID: 25603499 PMCID: PMC6272209 DOI: 10.3390/molecules20011527] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2014] [Accepted: 01/07/2015] [Indexed: 11/17/2022] Open
Abstract
Photocatalytic reactions have been defined as those processes that require both a (not consumed) catalyst and light. A previous definition was whether such reactions brought a system towards or away from the (thermal) equilibrium. This consideration brings in the question whether a part of the photon energy is incorporated into the photochemical reaction products. Data are provided for representative organic reactions involving or not molecular catalysts and show that energy storage occurs only when a heavily strained structure is generated, and in that case only a minor part of photon energy is actually stored (ΔG up to 25 kcal·mol−1). The green role of photochemistry/photocatalysis is rather that of forming highly reactive intermediates under mild conditions.
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72
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Protti S, Artioli GA, Capitani F, Marini C, Dore P, Postorino P, Malavasi L, Fagnoni M. Preparation of (substituted) picenes via solar light-induced Mallory photocyclization. RSC Adv 2015. [DOI: 10.1039/c5ra02855h] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022] Open
Abstract
(Substituted) picenes were obtained via photocyclization of dinaphthylethenes by a solar light-induced Mallory reaction. Picene (R = H) was characterized by means of Raman spectroscopy and X-ray diffraction analyses.
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Affiliation(s)
| | | | | | - Carlo Marini
- European Synchrotron Radiation Facility
- 38043 Grenoble Cedex
- France
| | - Paolo Dore
- Dipartimento di Fisica
- Sapienza Università di Roma
- 00185 Roma
- Italy
| | - Paolo Postorino
- Dipartimento di Fisica
- Sapienza Università di Roma
- 00185 Roma
- Italy
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73
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Moteki SA, Usui A, Selvakumar S, Zhang T, Maruoka K. Metal-free C-H bond activation of branched aldehydes with a hypervalent iodine(III) catalyst under visible-light photolysis: successful trapping with electron-deficient olefins. Angew Chem Int Ed Engl 2014; 53:11060-4. [PMID: 25155904 DOI: 10.1002/anie.201406513] [Citation(s) in RCA: 107] [Impact Index Per Article: 10.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2014] [Indexed: 11/08/2022]
Abstract
Direct acyl radical formation of linear aldehydes (RCH2-CHO) and subsequent hydroacylation with electron-deficient olefins can be effected with various types of metal and nonmetal catalysts/reagents. In marked contrast, however, no successful reports on the use of branched aldehydes have been made thus far because of their strong tendency of generating alkyl radicals through the facile decarbonylation of acyl radicals. Here, use of a hypervalent iodine(III) catalyst under visible light photolysis allows a mild way of generating acyl radicals from various branched aldehydes, thereby giving the corresponding hydroacylated products almost exclusively. Another characteristic feature of this approach is the catalytic use of hypervalent iodine(III) reagent, which is a rare example on the generation of radicals in hypervalent iodine chemistry.
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Affiliation(s)
- Shin A Moteki
- Laboratory of Synthetic Organic Chemistry and Special Laboratory of Organocatalytic Chemistry, Department of Chemistry, Graduate School of Science, Kyoto University, Sakyo, Kyoto 606-8502 (Japan)
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74
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Moteki SA, Usui A, Selvakumar S, Zhang T, Maruoka K. Metal-Free CH Bond Activation of Branched Aldehydes with a Hypervalent Iodine(III) Catalyst under Visible-Light Photolysis: Successful Trapping with Electron-Deficient Olefins. Angew Chem Int Ed Engl 2014. [DOI: 10.1002/ange.201406513] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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75
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Ravelli D, Zoccolillo M, Mella M, Fagnoni M. Photocatalytic Synthesis of Oxetane Derivatives by Selective CH Activation. Adv Synth Catal 2014. [DOI: 10.1002/adsc.201400027] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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76
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Halperin SD, Fan H, Chang S, Martin RE, Britton R. A Convenient Photocatalytic Fluorination of Unactivated CH Bonds. Angew Chem Int Ed Engl 2014; 53:4690-3. [DOI: 10.1002/anie.201400420] [Citation(s) in RCA: 210] [Impact Index Per Article: 21.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2014] [Indexed: 11/11/2022]
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77
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Halperin SD, Fan H, Chang S, Martin RE, Britton R. A Convenient Photocatalytic Fluorination of Unactivated CH Bonds. Angew Chem Int Ed Engl 2014. [DOI: 10.1002/ange.201400420] [Citation(s) in RCA: 63] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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78
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Fagnoni M, Bonassi F, Palmieri A, Protti S, Ravelli D, Ballini R. Flow Synthesis of Substituted γ-Lactones by Consecutive Photocatalytic/Reductive Reactions. Adv Synth Catal 2014. [DOI: 10.1002/adsc.201300859] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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79
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Zhang HB, Wang Y, Gu Y, Xu PF. Lewis- and Brønsted-acid cooperative catalytic radical coupling of aldehydes and azodicarboxylate. RSC Adv 2014. [DOI: 10.1039/c4ra05028b] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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80
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Okada M, Fukuyama T, Yamada K, Ryu I, Ravelli D, Fagnoni M. Sunlight photocatalyzed regioselective β-alkylation and acylation of cyclopentanones. Chem Sci 2014. [DOI: 10.1039/c4sc01072h] [Citation(s) in RCA: 121] [Impact Index Per Article: 12.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022] Open
Abstract
Visible light induced direct β-C–H/C–C conversion of cyclopentanones was accomplished by using tetrabutylammonium decatungstate, TBADT, as the photocatalyst.
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Affiliation(s)
- Megumi Okada
- Department of Chemistry
- Graduate School of Science Osaka Prefecture University
- Sakai, Japan
| | - Takahide Fukuyama
- Department of Chemistry
- Graduate School of Science Osaka Prefecture University
- Sakai, Japan
| | - Keiichi Yamada
- Department of Chemistry
- Graduate School of Science Osaka Prefecture University
- Sakai, Japan
| | - Ilhyong Ryu
- Department of Chemistry
- Graduate School of Science Osaka Prefecture University
- Sakai, Japan
| | - Davide Ravelli
- PhotoGreen Lab
- Department of Chemistry
- University of Pavia
- 27100 Pavia, Italy
| | - Maurizio Fagnoni
- PhotoGreen Lab
- Department of Chemistry
- University of Pavia
- 27100 Pavia, Italy
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81
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Chudasama V, Akhbar AR, Bahou KA, Fitzmaurice RJ, Caddick S. Metal-free, hydroacylation of C=C and N=N bonds via aerobic C-H activation of aldehydes, and reaction of the products thereof. Org Biomol Chem 2013; 11:7301-17. [PMID: 24068290 DOI: 10.1039/c3ob41632a] [Citation(s) in RCA: 47] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
In this report, a thorough evaluation of the use of aerobically initiated, metal-free hydroacylation of various C=C and N=N acceptor molecules with a wide range of aldehydes is presented. The aerobic-activation conditions that have been developed are in sharp contrast to previous conditions for hydroacylation, which tend to use transition metals, peroxides that require thermal or photochemical degradation, or N-heterocyclic carbenes. The mildness of the conditions enables a number of reactions involving sensitive reaction partners and, perhaps most significantly, allows for α-functionalised chiral aldehydes to undergo radical-based hydroacylation with complete retention of optical purity. We also demonstrate how the resulting hydroacylation products can be transformed into other useful intermediates, such as γ-keto-sulfonamides, sultams, sultones, cyclic N-sulfonyl imines and amides.
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Affiliation(s)
- Vijay Chudasama
- Department of Chemistry, University College London, 20 Gordon Street, London, WC1H OAJ, UK.
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82
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Ryu I, Tani A, Fukuyama T, Ravelli D, Montanaro S, Fagnoni M. Efficient C–H/C–N and C–H/C–CO–N Conversion via Decatungstate-Photoinduced Alkylation of Diisopropyl Azodicarboxylate. Org Lett 2013; 15:2554-7. [DOI: 10.1021/ol401061v] [Citation(s) in RCA: 113] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Affiliation(s)
- Ilhyong Ryu
- Department of Chemistry, Graduate School of Science, Osaka Prefecture University, Sakai, Osaka 599-8531, Japan, and PhotoGreen Lab, Department of Chemistry, University of Pavia, Viale Taramelli 12, 27100 Pavia, Italy
| | - Akihiro Tani
- Department of Chemistry, Graduate School of Science, Osaka Prefecture University, Sakai, Osaka 599-8531, Japan, and PhotoGreen Lab, Department of Chemistry, University of Pavia, Viale Taramelli 12, 27100 Pavia, Italy
| | - Takahide Fukuyama
- Department of Chemistry, Graduate School of Science, Osaka Prefecture University, Sakai, Osaka 599-8531, Japan, and PhotoGreen Lab, Department of Chemistry, University of Pavia, Viale Taramelli 12, 27100 Pavia, Italy
| | - Davide Ravelli
- Department of Chemistry, Graduate School of Science, Osaka Prefecture University, Sakai, Osaka 599-8531, Japan, and PhotoGreen Lab, Department of Chemistry, University of Pavia, Viale Taramelli 12, 27100 Pavia, Italy
| | - Sara Montanaro
- Department of Chemistry, Graduate School of Science, Osaka Prefecture University, Sakai, Osaka 599-8531, Japan, and PhotoGreen Lab, Department of Chemistry, University of Pavia, Viale Taramelli 12, 27100 Pavia, Italy
| | - Maurizio Fagnoni
- Department of Chemistry, Graduate School of Science, Osaka Prefecture University, Sakai, Osaka 599-8531, Japan, and PhotoGreen Lab, Department of Chemistry, University of Pavia, Viale Taramelli 12, 27100 Pavia, Italy
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83
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Yavorskyy A, Shvydkiv O, Hoffmann N, Nolan K, Oelgemöller M. Parallel Microflow Photochemistry: Process Optimization, Scale-up, and Library Synthesis. Org Lett 2012; 14:4342-5. [DOI: 10.1021/ol301773r] [Citation(s) in RCA: 80] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Affiliation(s)
- Alexander Yavorskyy
- Dublin City University, School of Chemical Sciences, Dublin 9, Ireland, UMR 7312 CNRS et Université de Reims Champagne-Ardenne, Institut de Chimie Moléculaire de Reims, UFR Sciences, B.P. 1039, 51687, Reims, Cedex 02, France, and James Cook University, School of Pharmacy and Molecular Sciences, CBMDT, Townsville, Queensland 4811, Australia
| | - Oksana Shvydkiv
- Dublin City University, School of Chemical Sciences, Dublin 9, Ireland, UMR 7312 CNRS et Université de Reims Champagne-Ardenne, Institut de Chimie Moléculaire de Reims, UFR Sciences, B.P. 1039, 51687, Reims, Cedex 02, France, and James Cook University, School of Pharmacy and Molecular Sciences, CBMDT, Townsville, Queensland 4811, Australia
| | - Norbert Hoffmann
- Dublin City University, School of Chemical Sciences, Dublin 9, Ireland, UMR 7312 CNRS et Université de Reims Champagne-Ardenne, Institut de Chimie Moléculaire de Reims, UFR Sciences, B.P. 1039, 51687, Reims, Cedex 02, France, and James Cook University, School of Pharmacy and Molecular Sciences, CBMDT, Townsville, Queensland 4811, Australia
| | - Kieran Nolan
- Dublin City University, School of Chemical Sciences, Dublin 9, Ireland, UMR 7312 CNRS et Université de Reims Champagne-Ardenne, Institut de Chimie Moléculaire de Reims, UFR Sciences, B.P. 1039, 51687, Reims, Cedex 02, France, and James Cook University, School of Pharmacy and Molecular Sciences, CBMDT, Townsville, Queensland 4811, Australia
| | - Michael Oelgemöller
- Dublin City University, School of Chemical Sciences, Dublin 9, Ireland, UMR 7312 CNRS et Université de Reims Champagne-Ardenne, Institut de Chimie Moléculaire de Reims, UFR Sciences, B.P. 1039, 51687, Reims, Cedex 02, France, and James Cook University, School of Pharmacy and Molecular Sciences, CBMDT, Townsville, Queensland 4811, Australia
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84
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Ravelli D, Montanaro S, Tomasi C, Galinetto P, Quartarone E, Merli D, Mustarelli P, Fagnoni M. One-Step Decatungstate-Photomediated PEGylation of Single-Walled Carbon Nanotubes. Chempluschem 2012. [DOI: 10.1002/cplu.201100040] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
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85
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Ravelli D, Montanaro S, Zema M, Fagnoni M, Albini A. A Tin-Free, Radical Photocatalyzed Addition to Vinyl Sulfones. Adv Synth Catal 2011. [DOI: 10.1002/adsc.201100591] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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86
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Eissen M, Brinkmann T, Klein M, Schwartze B, Weiß M. Einsatz von Kennzahlen in frühen Phasen der Syntheseentwicklung - Zwei Fallstudien. CHEM-ING-TECH 2011. [DOI: 10.1002/cite.201100114] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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87
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Ravelli D, Dondi D, Fagnoni M, Albini A, Bagno A. Predicting the UV spectrum of polyoxometalates by TD-DFT. J Comput Chem 2011; 32:2983-7. [DOI: 10.1002/jcc.21879] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2011] [Revised: 05/16/2011] [Accepted: 06/13/2011] [Indexed: 12/29/2022]
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88
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Taber DF, Nelson CG. Aliphatic C-H to C-C conversion: synthesis of (-)-cameroonan-7α-ol. J Org Chem 2011; 76:1874-82. [PMID: 21344897 DOI: 10.1021/jo200075v] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
In the course of a synthesis of the tricyclic sesquiterpene (-)-cameroonan-7α-ol from the acyclic (+)-citronellal, seven aliphatic C-H bonds were converted to C-C bonds, and three rings and four new stereogenic centers were established.
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Affiliation(s)
- Douglass F Taber
- Department of Chemistry and Biochemistry, University of Delaware, Newark, Delaware 19716, USA.
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89
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Ryu I, Tani A, Fukuyama T, Ravelli D, Fagnoni M, Albini A. Atom-Economical Synthesis of Unsymmetrical Ketones through Photocatalyzed CH Activation of Alkanes and Coupling with CO and Electrophilic Alkenes. Angew Chem Int Ed Engl 2011; 50:1869-72. [DOI: 10.1002/anie.201004854] [Citation(s) in RCA: 134] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2010] [Revised: 10/30/2010] [Indexed: 11/06/2022]
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90
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Ryu I, Tani A, Fukuyama T, Ravelli D, Fagnoni M, Albini A. Atom-Economical Synthesis of Unsymmetrical Ketones through Photocatalyzed CH Activation of Alkanes and Coupling with CO and Electrophilic Alkenes. Angew Chem Int Ed Engl 2011. [DOI: 10.1002/ange.201004854] [Citation(s) in RCA: 49] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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91
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Jahn U. Radicals in transition metal catalyzed reactions? transition metal catalyzed radical reactions? a fruitful interplay anyway: part 1. Radical catalysis by group 4 to group 7 elements. Top Curr Chem (Cham) 2011; 320:121-89. [PMID: 22025066 DOI: 10.1007/128_2011_261] [Citation(s) in RCA: 57] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
This review summarizes the current status of radical-based transition metal catalyzed reactions in organic chemistry. The underlying features of radical generation from transition metal complexes and radical reactivity in the framework of transition metal catalysis are discussed. The available arsenal to detect radicals in transition metal catalyzed transformations is presented. Available strategies to combine radical intermediates with transition metal catalysis are outlined. In the main part the currently known synthetic methodology of transition metal catalyzed reactions proceeding via radical intermediates is discussed. This part covers catalytic radical reactions involving group 4 to group 7 elements.
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Affiliation(s)
- Ullrich Jahn
- Institute of Organic Chemistry and Biochemistry, Academy of Sciences of the Czech Republic, Flemingovo namesti 2, 16610, Prague 6, Czech Republic.
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92
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Ravelli D, Albini A, Fagnoni M. Smooth Photocatalytic Preparation of 2‐Substituted 1,3‐Benzodioxoles. Chemistry 2010; 17:572-9. [DOI: 10.1002/chem.201002546] [Citation(s) in RCA: 50] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2010] [Indexed: 11/12/2022]
Affiliation(s)
- Davide Ravelli
- Department of Organic Chemistry, University of Pavia, Via Taramelli 10 (Italy), Fax: (+39) 0382‐987316
| | - Angelo Albini
- Department of Organic Chemistry, University of Pavia, Via Taramelli 10 (Italy), Fax: (+39) 0382‐987316
| | - Maurizio Fagnoni
- Department of Organic Chemistry, University of Pavia, Via Taramelli 10 (Italy), Fax: (+39) 0382‐987316
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93
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Ravelli D, Zema M, Mella M, Fagnoni M, Albini A. Benzoyl radicals from (hetero)aromatic aldehydes. Decatungstate photocatalyzed synthesis of substituted aromatic ketones. Org Biomol Chem 2010; 8:4158-64. [PMID: 20661511 DOI: 10.1039/c0ob00066c] [Citation(s) in RCA: 62] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Benzoyl radicals are generated directly from (hetero)aromatic aldehydes upon tetrabutylammonium decatungstate ((n-Bu(4)N)(4)W(10)O(32)), TBADT) photocatalysis under mild conditions. In the presence of alpha,beta-unsaturated esters, ketones and nitriles radical conjugate addition ensues and gives the corresponding beta-functionalized aryl alkyl ketones in moderate to good yields (stereoselectively in the case of 3-methylene-2-norbornanone). Due to the mild reaction conditions the presence of various functional groups on the aromatic ring is tolerated (e.g. methyl, methoxy, chloro). The method can be applied to hetero-aromatic aldehydes whether electron-rich (e.g. thiophene-2-carbaldehyde) or electron-poor (e.g. pyridine-3-carbaldehyde).
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Affiliation(s)
- Davide Ravelli
- Department of Organic Chemistry, University of Pavia, Viale Taramelli 10, 27100 Pavia, Italy
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94
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Burguete MI, Gavara R, Galindo F, Luis SV. New polymer-supported photocatalyst with improved compatibility with polar solvents. Synthetic application using solar light as energy source. CATAL COMMUN 2010. [DOI: 10.1016/j.catcom.2010.05.013] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022] Open
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95
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Chudasama V, Fitzmaurice RJ, Caddick S. Hydroacylation of α,β-unsaturated esters via aerobic C–H activation. Nat Chem 2010; 2:592-6. [DOI: 10.1038/nchem.685] [Citation(s) in RCA: 172] [Impact Index Per Article: 12.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2010] [Accepted: 04/21/2010] [Indexed: 12/17/2022]
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96
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Eissen M, Weiß M, Brinkmann T, Steinigeweg S. Comparison of Two Alternative Routes to an Enantiomerically Pure β-Amino Acid. Chem Eng Technol 2010. [DOI: 10.1002/ceat.201000046] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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97
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Dichiarante V, Fagnoni M, Albini A. Solarylations via 4-Aminophenyl Cations. J Org Chem 2010; 75:1271-6. [DOI: 10.1021/jo902669j] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Valentina Dichiarante
- Department of Organic Chemistry, University of Pavia, Viale Taramelli 10, 27100 Pavia, Italy
| | - Maurizio Fagnoni
- Department of Organic Chemistry, University of Pavia, Viale Taramelli 10, 27100 Pavia, Italy
| | - Angelo Albini
- Department of Organic Chemistry, University of Pavia, Viale Taramelli 10, 27100 Pavia, Italy
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