51
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Rogers FJM, Norcott PL, Coote ML. Recent advances in the chemistry of benzo[e][1,2,4]triazinyl radicals. Org Biomol Chem 2020; 18:8255-8277. [DOI: 10.1039/d0ob01394c] [Citation(s) in RCA: 27] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
Benzo[e][1,2,4]triazinyl, or Blatter radicals, are stable free radicals with customisable magnetic, spectroscopic and electrochemical properties, and wide-ranging applications in synthesis and functional materials.
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Affiliation(s)
- Fergus J. M. Rogers
- ARC Centre of Excellence for Electromaterials Science
- Research School of Chemistry
- Australian National University
- Canberra
- Australia
| | - Philip L. Norcott
- ARC Centre of Excellence for Electromaterials Science
- Research School of Chemistry
- Australian National University
- Canberra
- Australia
| | - Michelle L. Coote
- ARC Centre of Excellence for Electromaterials Science
- Research School of Chemistry
- Australian National University
- Canberra
- Australia
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52
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Ng JPL, Coghi P, Law BYK, Liu L, Wong VKW. The present and future synthetic strategies of structural modifications of sinomenine. Org Chem Front 2020. [DOI: 10.1039/d0qo00785d] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
This review summarizes the modifications of sinomenine, a hot compound derived from herbal plants, which possesses diverse biological activities and low cytotoxicity.
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Affiliation(s)
- Jerome P. L. Ng
- State Key Laboratory of Quality Research in Chinese Medicine
- Macau University of Science and Technology
- Taipa
- China
| | - Paolo Coghi
- School of Pharmacy
- Macau University of Science and Technology
- Taipa
- China
| | - Betty Yuen Kwan Law
- State Key Laboratory of Quality Research in Chinese Medicine
- Macau University of Science and Technology
- Taipa
- China
| | - Liang Liu
- State Key Laboratory of Quality Research in Chinese Medicine
- Macau University of Science and Technology
- Taipa
- China
| | - Vincent Kam Wai Wong
- State Key Laboratory of Quality Research in Chinese Medicine
- Macau University of Science and Technology
- Taipa
- China
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53
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Li J, Zhang Z, Wu L, Zhang W, Chen P, Lin Z, Liu G. Site-specific allylic C–H bond functionalization with a copper-bound N-centred radical. Nature 2019; 574:516-521. [DOI: 10.1038/s41586-019-1655-8] [Citation(s) in RCA: 127] [Impact Index Per Article: 25.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2019] [Accepted: 08/14/2019] [Indexed: 12/22/2022]
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54
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Boon BA, Boger DL. Triarylaminium Radical Cation Promoted Coupling of Catharanthine with Vindoline: Diastereospecific Synthesis of Anhydrovinblastine and Reaction Scope. J Am Chem Soc 2019; 141:14349-14355. [PMID: 31442047 DOI: 10.1021/jacs.9b06968] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A new triarylaminium radical cation promoted coupling of catharanthine with vindoline is disclosed, enlisting tris(4-bromophenyl)aminium hexachlororantimonate (BAHA, 1.1 equiv) in aqueous 0.05 N HCl/trifluoroethanol (1-10:1) at room temperature (25 °C), that provides anhydrovinblastine in superb yield (85%) with complete control of the newly formed quaternary C16' stereochemistry. A definition of the scope of aromatic substrates that participate with catharanthine in the BAHA-mediated diastereoselective coupling reaction and simplified indole substrates other than catharanthine that participate in the reaction are disclosed that identify the key structural features required for participation in the reaction, providing a generalized indole functionalization reaction that bears little structural relationship to catharanthine or vindoline.
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Affiliation(s)
- Byron A Boon
- Department of Chemistry and The Skaggs Institute of Chemical Biology , Scripps Research Institute , 10550 North Torrey Pines Road , La Jolla , California 92037 , United States
| | - Dale L Boger
- Department of Chemistry and The Skaggs Institute of Chemical Biology , Scripps Research Institute , 10550 North Torrey Pines Road , La Jolla , California 92037 , United States
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55
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Ide T, Barham JP, Fujita M, Kawato Y, Egami H, Hamashima Y. Regio- and chemoselective Csp 3-H arylation of benzylamines by single electron transfer/hydrogen atom transfer synergistic catalysis. Chem Sci 2018; 9:8453-8460. [PMID: 30542595 PMCID: PMC6244453 DOI: 10.1039/c8sc02965b] [Citation(s) in RCA: 69] [Impact Index Per Article: 11.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2018] [Accepted: 09/10/2018] [Indexed: 12/13/2022] Open
Abstract
We present a highly regio- and chemoselective Csp3-H arylation of benzylamines mediated by synergy of single electron transfer (SET) and hydrogen atom transfer (HAT) catalysis. Under well precedented SET catalysis alone, the arylation reaction of N,N-dimethylbenzylamine proceeded via aminium radical cation formation and selectively targeted the N-methyl group. In contrast, addition of PhC(O)SH as a HAT catalyst precursor completely switched the regioselectivity to Csp3-H arylation at the N-benzylic position. Measurement of oxidation potentials indicated that the conjugate base of PhC(O)SH is oxidized in preference to the substrate amine. The discovery of the thiocarboxylate as a novel HAT catalyst allowed for the selective generation of the sulfur-centered radical, so that the N-benzyl selectivity was achieved by overriding the inherent N-methyl and/or N-methylene selectivity under SET catalysis conditions. While visible light-driven α-C-H functionalization of amines has mostly been demonstrated with aniline derivatives and tetrahydroisoquinolines (THIQs), our method is applicable to a variety of primary, secondary and tertiary benzylamines for efficient N-benzylic C-H arylation. Functional group tolerance was high, and various 1,1-diarylmethylamines, including an α,α,α-trisubstituted amine, were obtained in good to excellent yield (up to 98%). Importantly, the reaction is applicable to late-stage functionalization of pharmaceuticals.
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Affiliation(s)
- Takafumi Ide
- School of Pharmaceutical Sciences , University of Shizuoka , 52-1 Yada, Suruga-ku , Shizuoka 422-8526 , Japan .
| | - Joshua P Barham
- School of Pharmaceutical Sciences , University of Shizuoka , 52-1 Yada, Suruga-ku , Shizuoka 422-8526 , Japan .
| | - Masashi Fujita
- School of Pharmaceutical Sciences , University of Shizuoka , 52-1 Yada, Suruga-ku , Shizuoka 422-8526 , Japan .
| | - Yuji Kawato
- School of Pharmaceutical Sciences , University of Shizuoka , 52-1 Yada, Suruga-ku , Shizuoka 422-8526 , Japan .
| | - Hiromichi Egami
- School of Pharmaceutical Sciences , University of Shizuoka , 52-1 Yada, Suruga-ku , Shizuoka 422-8526 , Japan .
| | - Yoshitaka Hamashima
- School of Pharmaceutical Sciences , University of Shizuoka , 52-1 Yada, Suruga-ku , Shizuoka 422-8526 , Japan .
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56
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Ye J, Kalvet I, Schoenebeck F, Rovis T. Direct α-alkylation of primary aliphatic amines enabled by CO 2 and electrostatics. Nat Chem 2018; 10:1037-1041. [PMID: 30061617 PMCID: PMC6150826 DOI: 10.1038/s41557-018-0085-9] [Citation(s) in RCA: 135] [Impact Index Per Article: 22.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2017] [Accepted: 05/17/2018] [Indexed: 12/24/2022]
Abstract
Primary aliphatic amines are important building blocks in organic synthesis due to the presence of a synthetically versatile NH2 group. N-functionalization of primary amines is well established, but selective C-functionalization of unprotected primary amines remains challenging. Here, we report the use of CO2 as an activator for the direct transformation of abundant primary aliphatic amines into valuable γ-lactams under photoredox and hydrogen atom transfer (HAT) catalysis. Experimental and computational studies suggest that CO2 not only inhibits undesired N-alkylation of primary amines, but also promotes selective intermolecular HAT by an electrostatically accelerated interaction between the in situ-generated negatively charged carbamate and the positively charged quinuclidinium radical. This electrostatic attraction overwhelms the inherent bond dissociation energies which suggest that HAT should occur unselectively. We anticipate that our findings will open up new avenues for amine functionalizations as well as selectivity control in HAT reactions.
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Affiliation(s)
- Juntao Ye
- Department of Chemistry, Columbia University, New York, NY, USA
| | - Indrek Kalvet
- Institute of Organic Chemistry, RWTH Aachen University, Aachen, Germany
| | | | - Tomislav Rovis
- Department of Chemistry, Columbia University, New York, NY, USA.
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57
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Beyond the classical thermodynamic contributions to hydrogen atom abstraction reactivity. Proc Natl Acad Sci U S A 2018; 115:E10287-E10294. [PMID: 30254163 DOI: 10.1073/pnas.1806399115] [Citation(s) in RCA: 61] [Impact Index Per Article: 10.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Hydrogen atom abstraction (HAA) reactions are cornerstones of chemistry. Various (metallo)enzymes performing the HAA catalysis evolved in nature and inspired the rational development of multiple synthetic catalysts. Still, the factors determining their catalytic efficiency are not fully understood. Herein, we define the simple thermodynamic factor η by employing two thermodynamic cycles: one for an oxidant (catalyst), along with its reduced, protonated, and hydrogenated form; and one for the substrate, along with its oxidized, deprotonated, and dehydrogenated form. It is demonstrated that η reflects the propensity of the substrate and catalyst for (a)synchronicity in concerted H+/e- transfers. As such, it significantly contributes to the activation energies of the HAA reactions, in addition to a classical thermodynamic (Bell-Evans-Polanyi) effect. In an attempt to understand the physicochemical interpretation of η, we discovered an elegant link between η and reorganization energy λ from Marcus theory. We discovered computationally that for a homologous set of HAA reactions, λ reaches its maximum for the lowest |η|, which then corresponds to the most synchronous HAA mechanism. This immediately implies that among HAA processes with the same reaction free energy, ΔG 0, the highest barrier (≡ΔG ≠) is expected for the most synchronous proton-coupled electron (i.e., hydrogen) transfer. As proof of concept, redox and acidobasic properties of nonheme FeIVO complexes are correlated with activation free energies for HAA from C-H and O-H bonds. We believe that the reported findings may represent a powerful concept in designing new HAA catalysts.
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58
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Jia X, Liu X, Yuan Y, Li P, Hou W, He K. Radical Cation Salt-initiated Aerobic C-H Phosphorylation of N-Benzylanilines: Synthesis of α-Aminophosphonates. Chem Asian J 2018; 13:1911-1914. [PMID: 29862658 DOI: 10.1002/asia.201800584] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2018] [Revised: 05/30/2018] [Indexed: 01/23/2023]
Abstract
A radical cation salt-initiated phosphorylation of N-benzylanilines was realized through an aerobic oxidation of the sp3 C-H bond, providing a series of α-aminophosphonates in high yields. An investigation of the reaction scope revealed that this mild catalyst system is superior in good functional group tolerance and high reaction efficiency. The mechanistic study implied that the cleavage of the sp3 C-H bond was involved in the rate-determining step.
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Affiliation(s)
- Xiaodong Jia
- School of Chemistry & Chemical Engineering, Yangzhou University, Siwangting Road 180, Yangzhou, Jiangsu, 225002, China
| | - Xiaofei Liu
- College of Chemistry&Chemical Engineering, Northwest Normal University, Anning East Road 967, Lanzhou, Gansu, 730070, China
| | - Yu Yuan
- School of Chemistry & Chemical Engineering, Yangzhou University, Siwangting Road 180, Yangzhou, Jiangsu, 225002, China
| | - Pengfei Li
- College of Chemistry&Chemical Engineering, Northwest Normal University, Anning East Road 967, Lanzhou, Gansu, 730070, China
| | - Wentao Hou
- College of Chemistry&Chemical Engineering, Northwest Normal University, Anning East Road 967, Lanzhou, Gansu, 730070, China
| | - Kaixuan He
- School of Chemistry & Chemical Engineering, Yangzhou University, Siwangting Road 180, Yangzhou, Jiangsu, 225002, China
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59
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Salamone M, Ortega VB, Martin T, Bietti M. Hydrogen Atom Transfer from Alkanols and Alkanediols to the Cumyloxyl Radical: Kinetic Evaluation of the Contribution of α-C-H Activation and β-C-H Deactivation. J Org Chem 2018; 83:5539-5545. [PMID: 29668277 DOI: 10.1021/acs.joc.8b00562] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
A kinetic study on the reactions of the cumyloxyl radical (CumO•) with a series of alkanols and alkanediols has been carried out. Predominant hydrogen atom transfer (HAT) from the α-C-H bonds of these substrates, activated by the presence of the OH group, is observed. The comparable kH values measured for ethanol and 1-propanol and the increase in kH measured upon going from 1,2-diols to structurally related 1,3- and 1,4-diols is indicative of β-C-H deactivation toward HAT to the electrophilic CumO•, determined by the electron-withdrawing character of the OH group. No analogous deactivation is observed for the corresponding diamines, in agreement with the weaker electron-withdrawing character of the NH2 group. The significantly lower kH values measured for reaction of CumO• with densely oxygenated methyl pyranosides as compared to cyclohexanol derivatives highlights the role of β-C-H deactivation. The contribution of torsional effects on reactivity is evidenced by the ∼2-fold increase in kH observed upon going from the trans isomers of 4- tert-butylcyclohexanol and 1,2- and 1,4-cyclohexanediol to the corresponding cis isomers. These results provide an evaluation of the role of electronic and torsional effects on HAT reactions from alcohols and diols to CumO•, uncovering moreover β-C-H deactivation as a relevant contributor in defining site selectivity.
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Affiliation(s)
- Michela Salamone
- Dipartimento di Scienze e Tecnologie Chimiche , Università "Tor Vergata" , Via della Ricerca Scientifica 1 , I-00133 Rome , Italy
| | - Vanesa B Ortega
- Dipartimento di Scienze e Tecnologie Chimiche , Università "Tor Vergata" , Via della Ricerca Scientifica 1 , I-00133 Rome , Italy
| | - Teo Martin
- Dipartimento di Scienze e Tecnologie Chimiche , Università "Tor Vergata" , Via della Ricerca Scientifica 1 , I-00133 Rome , Italy
| | - Massimo Bietti
- Dipartimento di Scienze e Tecnologie Chimiche , Università "Tor Vergata" , Via della Ricerca Scientifica 1 , I-00133 Rome , Italy
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60
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Qi ZH, Ma J. Dual Role of a Photocatalyst: Generation of Ni(0) Catalyst and Promotion of Catalytic C–N Bond Formation. ACS Catal 2018. [DOI: 10.1021/acscatal.7b03024] [Citation(s) in RCA: 51] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Affiliation(s)
- Zheng-Hang Qi
- Key Laboratory of Mesoscopic
Chemistry of MOE, Jiangsu Key Laboratory of Advanced Organic Materials,
School of Chemistry and Chemical Engineering, Nanjing University, 22 Hankou Road, Nanjing, Jiangsu Province 210093, People’s Republic of China
| | - Jing Ma
- Key Laboratory of Mesoscopic
Chemistry of MOE, Jiangsu Key Laboratory of Advanced Organic Materials,
School of Chemistry and Chemical Engineering, Nanjing University, 22 Hankou Road, Nanjing, Jiangsu Province 210093, People’s Republic of China
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61
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1,4-Diazabicyclo[2.2.2]octane in the synthesis of piperazine derivatives (microreview). Chem Heterocycl Compd (N Y) 2018. [DOI: 10.1007/s10593-018-2205-2] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
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62
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Oss G, de Vos SD, Luc KNH, Harper JB, Nguyen TV. Tropylium-Promoted Oxidative Functionalization of Tetrahydroisoquinolines. J Org Chem 2018; 83:1000-1010. [DOI: 10.1021/acs.joc.7b02584] [Citation(s) in RCA: 38] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Affiliation(s)
- Giulia Oss
- School of Chemistry, University of New South Wales, Sydney, Australia
| | - Sander D. de Vos
- School of Chemistry, University of New South Wales, Sydney, Australia
| | - Kevin N. H. Luc
- School of Chemistry, University of New South Wales, Sydney, Australia
| | - Jason B. Harper
- School of Chemistry, University of New South Wales, Sydney, Australia
| | - Thanh V. Nguyen
- School of Chemistry, University of New South Wales, Sydney, Australia
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63
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Qiu G, Zhou K, Gao L, Wu J. Insertion of sulfur dioxide via a radical process: an efficient route to sulfonyl compounds. Org Chem Front 2018. [DOI: 10.1039/c7qo01073g] [Citation(s) in RCA: 216] [Impact Index Per Article: 36.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
This review is focused on the recent advances in the chemistry of sulfur dioxide fixation through a radical process. Diverse sulfonyl compounds can be obtained efficiently under mild conditions.
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Affiliation(s)
- Guanyinsheng Qiu
- College of Biological
- Chemical Science and Engineering
- Jiaxing University
- Jiaxing 314001
- China
| | - Kaida Zhou
- Department of Chemistry
- Fudan University
- Shanghai 200433
- China
| | - Liang Gao
- Department of Natural Science and Computer Science
- Ganzhou Teacher's College
- Ganzhou
- China
| | - Jie Wu
- Department of Chemistry
- Fudan University
- Shanghai 200433
- China
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64
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Wang H, Man Y, Wang K, Wan X, Tong L, Li N, Tang B. Hydrogen bond directed aerobic oxidation of amines via photoredox catalysis. Chem Commun (Camb) 2018; 54:10989-10992. [DOI: 10.1039/c8cc06603e] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
An application of H-bonding interactions for directing the α-C–H oxidation of amines to amides and amino-ketones catalyzed by an organic photocatalyst with high yields and a wide substrate scope is reported.
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Affiliation(s)
- Hongyu Wang
- College of Chemistry, Chemical Engineering and Materials Science
- Collaborative Innovation Center of Functionalized Probes for Chemical Imaging in Universities of Shandong
- Key Laboratory of Molecular and Nano Probes
- Ministry of Education
- Institute of Molecular and Nano Science
| | - Yunquan Man
- College of Chemistry, Chemical Engineering and Materials Science
- Collaborative Innovation Center of Functionalized Probes for Chemical Imaging in Universities of Shandong
- Key Laboratory of Molecular and Nano Probes
- Ministry of Education
- Institute of Molecular and Nano Science
| | - Kaiye Wang
- College of Chemistry, Chemical Engineering and Materials Science
- Collaborative Innovation Center of Functionalized Probes for Chemical Imaging in Universities of Shandong
- Key Laboratory of Molecular and Nano Probes
- Ministry of Education
- Institute of Molecular and Nano Science
| | - Xiuyan Wan
- College of Chemistry, Chemical Engineering and Materials Science
- Collaborative Innovation Center of Functionalized Probes for Chemical Imaging in Universities of Shandong
- Key Laboratory of Molecular and Nano Probes
- Ministry of Education
- Institute of Molecular and Nano Science
| | - Lili Tong
- College of Chemistry, Chemical Engineering and Materials Science
- Collaborative Innovation Center of Functionalized Probes for Chemical Imaging in Universities of Shandong
- Key Laboratory of Molecular and Nano Probes
- Ministry of Education
- Institute of Molecular and Nano Science
| | - Na Li
- College of Chemistry, Chemical Engineering and Materials Science
- Collaborative Innovation Center of Functionalized Probes for Chemical Imaging in Universities of Shandong
- Key Laboratory of Molecular and Nano Probes
- Ministry of Education
- Institute of Molecular and Nano Science
| | - Bo Tang
- College of Chemistry, Chemical Engineering and Materials Science
- Collaborative Innovation Center of Functionalized Probes for Chemical Imaging in Universities of Shandong
- Key Laboratory of Molecular and Nano Probes
- Ministry of Education
- Institute of Molecular and Nano Science
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65
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Zhang J, Zhou K, Wu J. Generation of sulfonated isobenzofuran-1(3H)-ones under photocatalysis through the insertion of sulfur dioxide. Org Chem Front 2018. [DOI: 10.1039/c7qo00987a] [Citation(s) in RCA: 56] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
Generation of sulfonated isobenzofuran-1(3H)-ones starting from 2-vinylbenzoic acids, aryldiazonium tetrafluoroborates, and DABCO˙(SO2)2 under photocatalysis in the presence of visible light is achieved. Additionally, the method can be extended to 4-phenylpent-4-enoic acid and 5-phenylhex-5-enoic acid.
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Affiliation(s)
- Jun Zhang
- Department of Chemistry
- Fudan University
- Shanghai 200433
- China
| | - Kaida Zhou
- Department of Chemistry
- Fudan University
- Shanghai 200433
- China
| | - Jie Wu
- Department of Chemistry
- Fudan University
- Shanghai 200433
- China
- State Key Laboratory of Organometallic Chemistry
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66
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Yin ZB, Ye JH, Zhou WJ, Zhang YH, Ding L, Gui YY, Yan SS, Li J, Yu DG. Oxy-Difluoroalkylation of Allylamines with CO 2 via Visible-Light Photoredox Catalysis. Org Lett 2017; 20:190-193. [PMID: 29280636 DOI: 10.1021/acs.orglett.7b03551] [Citation(s) in RCA: 85] [Impact Index Per Article: 12.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
A selective oxy-difluoroalkylation of allylamines with carbon dioxide (CO2) via visible-light photoredox catalysis is reported. These multicomponent reactions are efficient and environmentally friendly to generate a series of important 2-oxazolidinones with functionalized difluoroalkyl groups. The good functional group tolerance, broad substrate scope, easy scalability, mild reaction conditions, and facile functionalization of products provide great potential for application in organic synthesis and pharmaceutical chemistry.
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Affiliation(s)
- Zhu-Bao Yin
- Key Laboratory of Green Chemistry & Technology of Ministry of Education, College of Chemistry, Sichuan University , Chengdu 610064, P. R. China
| | - Jian-Heng Ye
- Key Laboratory of Green Chemistry & Technology of Ministry of Education, College of Chemistry, Sichuan University , Chengdu 610064, P. R. China
| | - Wen-Jun Zhou
- Key Laboratory of Green Chemistry & Technology of Ministry of Education, College of Chemistry, Sichuan University , Chengdu 610064, P. R. China.,College of Chemistry and Chemical Engineering, Neijiang Normal University , Neijiang 641112, P. R. China
| | - Yi-Han Zhang
- Key Laboratory of Green Chemistry & Technology of Ministry of Education, College of Chemistry, Sichuan University , Chengdu 610064, P. R. China
| | - Li Ding
- Key Laboratory of Green Chemistry & Technology of Ministry of Education, College of Chemistry, Sichuan University , Chengdu 610064, P. R. China
| | - Yong-Yuan Gui
- Key Laboratory of Green Chemistry & Technology of Ministry of Education, College of Chemistry, Sichuan University , Chengdu 610064, P. R. China
| | - Si-Shun Yan
- Key Laboratory of Green Chemistry & Technology of Ministry of Education, College of Chemistry, Sichuan University , Chengdu 610064, P. R. China
| | - Jing Li
- Key Laboratory of Green Chemistry & Technology of Ministry of Education, College of Chemistry, Sichuan University , Chengdu 610064, P. R. China
| | - Da-Gang Yu
- Key Laboratory of Green Chemistry & Technology of Ministry of Education, College of Chemistry, Sichuan University , Chengdu 610064, P. R. China
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67
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Liu T, Zheng D, Li Z, Wu J. Synthesis of Sulfonated Benzo[d
][1,3]oxazines by Merging Photoredox Catalysis and Insertion of Sulfur Dioxide. Adv Synth Catal 2017. [DOI: 10.1002/adsc.201701187] [Citation(s) in RCA: 49] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Affiliation(s)
- Tong Liu
- Department of Chemistry; Fudan University; 220 Handan Road Shanghai 200433 People's Republic of China
| | - Danqing Zheng
- Department of Chemistry; Fudan University; 220 Handan Road Shanghai 200433 People's Republic of China
| | - Zhenhua Li
- Department of Chemistry; Fudan University; 220 Handan Road Shanghai 200433 People's Republic of China
| | - Jie Wu
- Department of Chemistry; Fudan University; 220 Handan Road Shanghai 200433 People's Republic of China
- State Key Laboratory of Organometallic Chemistry; Shanghai Institute of Organic Chemistry; Chinese Academy of Sciences; 345 Lingling Road Shanghai 200032 People's Republic of China
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68
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Khan R, Boonseng S, Kemmitt PD, Felix R, Coles SJ, Tizzard GJ, Williams G, Simmonds O, Harvey J, Atack J, Cox H, Spencer J. Combining Sanford Arylations on Benzodiazepines with the Nuisance Effect. Adv Synth Catal 2017; 359:3261-3269. [PMID: 30100832 PMCID: PMC6079647 DOI: 10.1002/adsc.201700626] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2017] [Revised: 06/29/2017] [Indexed: 12/14/2022]
Abstract
5-Phenyl-1,3-dihydro-2H-1,4-benzodiazepin-2-ones react under palladium- and visible light photoredox catalysis, in refluxing methanol, with aryldiazonium salts to afford the respective 5-(2-arylphenyl) analogues. With 2- or 4-fluorobenzenediazonium derivatives, both fluoroaryl- and methoxyaryl- products were obtained, the latter resulting from a SNAr on the fluorobenzenediazonium salt ("nuisance effect"). A computational DFT analysis of the palladium-catalysed and the palladium/ruthenium-photocalysed mechanism for the functionalization of benzodiazepines indicated that, in the presence of the photocatalyst, the reaction proceeds via a low-energy SET pathway avoiding the high-energy oxidative addition step in the palladium-only catalysed reaction pathway.
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Affiliation(s)
- Raysa Khan
- Department of ChemistrySchool of Life SciencesUniversity of SussexFalmerBN1 9QJUK
| | - Sarote Boonseng
- Department of ChemistrySchool of Life SciencesUniversity of SussexFalmerBN1 9QJUK
| | - Paul D. Kemmitt
- OncologyAstraZeneca310 Cambridge Science ParkMilton RoadCambridgeCB4 0WGUK
| | - Robert Felix
- Tocris Bioscience, the Watkins BuildingAtlantic Road, AvonmouthBristolBS11 9QDUK
| | - Simon J. Coles
- UK National Crystallography ServiceSchool of ChemistryUniversity of SouthamptonHighfieldSouthamptonSO17 1BJU.K.
| | - Graham J. Tizzard
- UK National Crystallography ServiceSchool of ChemistryUniversity of SouthamptonHighfieldSouthamptonSO17 1BJU.K.
| | - Gareth Williams
- Sussex Drug Discovery CentreSchool of Life SciencesUniversity of SussexFalmerBN1 9QJUK
| | - Olivia Simmonds
- Sussex Drug Discovery CentreSchool of Life SciencesUniversity of SussexFalmerBN1 9QJUK
| | - Jessica‐Lily Harvey
- Sussex Drug Discovery CentreSchool of Life SciencesUniversity of SussexFalmerBN1 9QJUK
| | - John Atack
- Sussex Drug Discovery CentreSchool of Life SciencesUniversity of SussexFalmerBN1 9QJUK
| | - Hazel Cox
- Department of ChemistrySchool of Life SciencesUniversity of SussexFalmerBN1 9QJUK
| | - John Spencer
- Department of ChemistrySchool of Life SciencesUniversity of SussexFalmerBN1 9QJUK
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69
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Jia X, Li P, Shao Y, Yuan Y, Hou W, Liu X, Zhang X, Ji H. Facile Construction of Quinoline-2-carboxylate Esters through Aerobic Oxidation of Alkyl 4-Anilinocrotonates Induced by a Radical Cation Salt. Chem Asian J 2017; 12:1719-1723. [PMID: 28485117 DOI: 10.1002/asia.201700560] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2017] [Revised: 05/03/2017] [Indexed: 12/12/2022]
Abstract
A facile construction of quinoline-2-carboxylate esters through an aerobic oxidation of alkyl 4-anilinocrotonates is described. In the presence of dioxygen, sp3 C-H bonds in 4-anilinocrotonates can easily be oxidized by using a catalytic amount of a radical cation salt, providing a radical intermediate. After further oxidation and domino cyclization, the desired quinoline derivatives were afforded in high yields. This reaction provides a new way to construct the pharmaceutically relevant quinoline skeleton, avoiding harsh reaction conditions and tedious starting material synthesis.
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Affiliation(s)
- Xiaodong Jia
- School of Chemistry&Chemical Engineering, Yangzhou University, Yangzhou, Jiangsu, 225002, China
| | - Pengfei Li
- College of Chemistry&Chemical Engineering, Northwest Normal University, Lanzhou, Gansu, 730070, China
| | - Yu Shao
- School of Information Engineering, Yangzhou University, Yangzhou, Jiangsu, 225127, China
| | - Yu Yuan
- School of Chemistry&Chemical Engineering, Yangzhou University, Yangzhou, Jiangsu, 225002, China
| | - Wentao Hou
- College of Chemistry&Chemical Engineering, Northwest Normal University, Lanzhou, Gansu, 730070, China
| | - Xiaofei Liu
- College of Chemistry&Chemical Engineering, Northwest Normal University, Lanzhou, Gansu, 730070, China
| | - Xuewen Zhang
- School of Chemistry&Chemical Engineering, Yangzhou University, Yangzhou, Jiangsu, 225002, China
| | - Honghe Ji
- College of Chemistry&Chemical Engineering, Northwest Normal University, Lanzhou, Gansu, 730070, China
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70
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Liu T, Zheng D, Li Z, Wu J. A Route to O
-Aminosulfonates and Sulfonamides through Insertion of Sulfur Dioxide and Hydrogen Atom Transfer. Adv Synth Catal 2017. [DOI: 10.1002/adsc.201700501] [Citation(s) in RCA: 48] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Affiliation(s)
- Tong Liu
- Department of Chemistry; Fudan University; 220 Handan Road Shanghai 200433 People's Republic of China
| | - Danqing Zheng
- Department of Chemistry; Fudan University; 220 Handan Road Shanghai 200433 People's Republic of China
| | - Zhenhua Li
- Department of Chemistry; Fudan University; 220 Handan Road Shanghai 200433 People's Republic of China
| | - Jie Wu
- Department of Chemistry; Fudan University; 220 Handan Road Shanghai 200433 People's Republic of China
- State Key Laboratory of Organometallic Chemistry; Shanghai Institute of Organic Chemistry; Chinese Academy of Sciences; 345 Lingling Road Shanghai 200032 People's Republic of China
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71
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Liu S, Liu A, Zhang Y, Wang W. Direct Cα-heteroarylation of structurally diverse ethers via a mild N-hydroxysuccinimide mediated cross-dehydrogenative coupling reaction. Chem Sci 2017; 8:4044-4050. [PMID: 30155212 PMCID: PMC6094177 DOI: 10.1039/c6sc05697k] [Citation(s) in RCA: 72] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/28/2016] [Accepted: 03/23/2017] [Indexed: 12/15/2022] Open
Abstract
An important challenge in the Cα-heteroarylation of ethers is the requirement of a large excess amount of ethers (that are used as solvents in many cases) to achieve effective transformations. This drawback has significantly restricted the Cα-heteroarylation of ethers to the use of simple and easily accessible ether substrates. To overcome this limitation, a new, efficient, N-hydroxysuccinimide (NHS) mediated, mild and metal-free CDC strategy for the direct Cα-heteroarylation of diverse ethers has been developed. Different to our previous benzaldehyde mediated photoredox Cα-heteroarylation, we have identified NHS as a new and efficient mediator without using light. A distinct non-photoredox engaged hydrogen-atom-transfer (HAT) mechanism that used a nitrogen-centered radical cation produced from NHS is initially revealed. Notably, only 5-10 equivalents of ethers as coupling partners are used, which allows for structurally diverse and complex ethers to engage in this process, to create highly medicinally relevant Cα-heteroarylated ethers. Furthermore, more structurally diverse heterocyclics can serve as reactants for this process.
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Affiliation(s)
- Shihui Liu
- Shanghai Key Laboratory of New Drug Design , School of Pharmacy , State Key Laboratory of Bioengineering Reactor , East China University of Science and Technology , 130 Mei-long Road , Shanghai 200237 , China . ;
| | - Aoxia Liu
- Shanghai Key Laboratory of New Drug Design , School of Pharmacy , State Key Laboratory of Bioengineering Reactor , East China University of Science and Technology , 130 Mei-long Road , Shanghai 200237 , China . ;
| | - Yongqiang Zhang
- Shanghai Key Laboratory of New Drug Design , School of Pharmacy , State Key Laboratory of Bioengineering Reactor , East China University of Science and Technology , 130 Mei-long Road , Shanghai 200237 , China . ;
| | - Wei Wang
- Shanghai Key Laboratory of New Drug Design , School of Pharmacy , State Key Laboratory of Bioengineering Reactor , East China University of Science and Technology , 130 Mei-long Road , Shanghai 200237 , China . ;
- Department of Chemistry and Chemical Biology , University of New Mexico , Albuquerque , NM 87131-0001 , USA
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72
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Sattar M, Rathore V, Prasad CD, Kumar S. Transition-metal-free Chemoselective Oxidative C-C Coupling of the sp 3 C-H Bond of Oxindoles with Arenes and Addition to Alkene: Synthesis of 3-Aryl Oxindoles, and Benzofuro- and Indoloindoles. Chem Asian J 2017; 12:734-743. [PMID: 28169505 DOI: 10.1002/asia.201601647] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2016] [Revised: 02/03/2017] [Indexed: 01/11/2023]
Abstract
A transition-metal (TM)-free and halogen-free NaOtBu-mediated oxidative cross-coupling between the sp3 C-H bond of oxindoles and sp2 C-H bond of nitroarenes has been developed to access 3-aryl substituted and 3,3-aryldisubstituted oxindoles in DMSO at room temperature in a short time. Interestingly, the sp3 C-H bond of oxindoles could also react with styrene under TM-free conditions for the practical synthesis of quaternary 3,3-disubstituted oxindoles. The synthesized 3-oxindoles have also been further transformed into advanced heterocycles, that is, benzofuroindoles, indoloindoles, and substituted indoles. Mechanistic experiments of the reaction suggests the formation of an anion intermediate from the sp3 C-H bond of oxindole by tert-butoxide base in DMSO. The addition of nitrobenzene to the in-situ generated carbanion leads to the 3-(nitrophenyl)oxindolyl carbanion in DMSO which is subsequently oxidized to 3-(nitro-aryl) oxindole by DMSO.
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Affiliation(s)
- Moh Sattar
- Department of Chemistry, Indian Institute of Science Education and Research, Bhopal, Bhopal Bypass Road, Bhauri Bhopal, Madhya Pradesh, 462066, India
| | - Vandana Rathore
- Department of Chemistry, Indian Institute of Science Education and Research, Bhopal, Bhopal Bypass Road, Bhauri Bhopal, Madhya Pradesh, 462066, India
| | - Ch Durga Prasad
- Department of Chemistry, Indian Institute of Science Education and Research, Bhopal, Bhopal Bypass Road, Bhauri Bhopal, Madhya Pradesh, 462066, India
| | - Sangit Kumar
- Department of Chemistry, Indian Institute of Science Education and Research, Bhopal, Bhopal Bypass Road, Bhauri Bhopal, Madhya Pradesh, 462066, India
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73
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Gini A, Brandhofer T, Mancheño OG. Recent progress in mild Csp3–H bond dehydrogenative or (mono-) oxidative functionalization. Org Biomol Chem 2017; 15:1294-1312. [DOI: 10.1039/c6ob02474b] [Citation(s) in RCA: 59] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
This review summarizes recent advances in mild and green dehydrogenative and mono-oxidative Csp3–H bond functionalization reactions, considering both new approaches and the re-elaboration of known methodologies.
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Affiliation(s)
- Andrea Gini
- Institute for Organic Chemistry
- University of Regensburg
- 93053 Regensburg
- Germany
- Straubing Center of Science for Renewable Resources
| | - Tobias Brandhofer
- Institute for Organic Chemistry
- University of Regensburg
- 93053 Regensburg
- Germany
- Straubing Center of Science for Renewable Resources
| | - Olga García Mancheño
- Institute for Organic Chemistry
- University of Regensburg
- 93053 Regensburg
- Germany
- Straubing Center of Science for Renewable Resources
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