1
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Elavarasan S, Preety J, Kesavan M, Patel RB, Baskar B. Activation of enamine by photoexcited organocatalyst assisted singlet oxygen: synthesis of oxazoles and quinoxalines. Org Biomol Chem 2024; 22:4912-4921. [PMID: 38808593 DOI: 10.1039/d4ob00609g] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/30/2024]
Abstract
Herein, a novel transition-metal-free thiol-based donor-acceptor organophotocatalyst-assisted, singlet-oxygen-mediated tandem oxidative cyclization for the synthesis of substituted oxazoles in moderate-to-good yields is described. The developed method demonstrates applicability for the synthesis of various substituted quinoxalines in good-to-excellent yields. The metal-free methodology shows a practical route for the synthesis of oxazole and quinoxaline derivatives, which are privileged moieties prevalent in various biologically active compounds and natural products. To the best of our knowledge, both the thiol photocatalyst and synthesis of oxazoles by visible-light irradiation are reported for the first time.
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Affiliation(s)
- Selvaraj Elavarasan
- Laboratory of Sustainable Synthesis, Department of Chemistry, SRM Institute of Science and Technology, Kattankulatur, 603 203, Chengalpet (Dt), Tamilnadu, India.
| | - Jeyaraj Preety
- Laboratory of Sustainable Synthesis, Department of Chemistry, SRM Institute of Science and Technology, Kattankulatur, 603 203, Chengalpet (Dt), Tamilnadu, India.
| | - M Kesavan
- Interdisciplinary Institute of Indian System of Medicine (IIISM), SRM Institute of Science and Technology, Kattankulatur, 603 203, Chengalpet (Dt), Tamilnadu, India
| | - Ravi B Patel
- Graduate School of Pharmacy, Gujarat Technological University, Ghandhinagar Campus, Ghandhinagar - 382028, Gujarat, India
| | - Baburaj Baskar
- Laboratory of Sustainable Synthesis, Department of Chemistry, SRM Institute of Science and Technology, Kattankulatur, 603 203, Chengalpet (Dt), Tamilnadu, India.
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2
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Bera D, Sarkar R, Dhar T, Saha P, Ghosh P, Mukhopadhyay C. DMSO promoted catalyst-free oxidative C-N/C-O couplings towards synthesis of imidazoles and oxazoles. Org Biomol Chem 2024; 22:3684-3692. [PMID: 38624070 DOI: 10.1039/d4ob00383g] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/17/2024]
Abstract
Dimethyl sulfoxide (DMSO)-promoted catalyst-free oxidative C-N coupling and C-O coupling under oxidant-free conditions are outlined. This protocol is operationally simple and leads to various functionalized substituted imidazoles or oxazoles in good yields. To date, a very limited number of oxidation protocols have been established, where DMSO acts solely as a catalyst or an oxidant or both. In this report, DMSO is not only used as a C-N/C-O coupling agent but is also used as the oxidant required for these oxidative transformations. Hence, our demonstrated DMSO-promoted catalyst-free coupling transformation has the ability to lead to a new dimension in the field of oxidative coupling.
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Affiliation(s)
- Debasish Bera
- Department of Chemistry, University of Calcutta, 92 APC Road, Kolkata-700009, India.
| | - Rajib Sarkar
- Department of Chemistry, Prabhu Jagatbandhu College, Jhorehat, Andul-Mouri, Howrah-711302, India
| | - Tiyasa Dhar
- Department of Chemistry, University of Calcutta, 92 APC Road, Kolkata-700009, India.
| | - Pinaki Saha
- Department of Chemistry, R. K. Mission Residential College, Narendrapur, Kolkata-700103, India
| | - Prasanta Ghosh
- Department of Chemistry, R. K. Mission Residential College, Narendrapur, Kolkata-700103, India
| | - Chhanda Mukhopadhyay
- Department of Chemistry, University of Calcutta, 92 APC Road, Kolkata-700009, India.
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3
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Liang D, Zhou QQ, Xuan J. Multiple-cycle photochemical cascade reactions. Org Biomol Chem 2024; 22:2156-2174. [PMID: 38385507 DOI: 10.1039/d4ob00071d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/23/2024]
Abstract
Cascade reactions represent an efficient and economical synthetic approach, enabling the rapid synthesis of a wide array of structurally complex organic compounds. These compounds, previously inaccessible, can now be synthesized in a remarkably limited number of steps. Concurrently, the photochemical reactions of organic molecules have gained prominence as a potent strategy for accessing a diverse range of radical species and intermediates. This is achieved in a controlled manner under mild conditions. Owing to the relentless endeavors of chemists, significant strides have been made in the realm of photochemical cascade reactions. These advancements have facilitated the synthesis of novel molecular structures with high complexity, structures that are typically challenging to generate under thermal conditions. In this review, we comprehensively summarize and underscore the recent pivotal advancements in visible-light-induced cascade reactions. Our focus is on the elucidation of multiple photochemical catalytic cycles, emphasizing the catalytic activation modes and the types of reactions involved.
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Affiliation(s)
- Dong Liang
- School of Chemistry and Materials Engineering, Fuyang Normal University, Fuyang 236037, China
| | - Quan-Quan Zhou
- Institute of Advanced Materials, Jiangxi Normal University, Nanchang 330022, China.
| | - Jun Xuan
- Anhui Province Key Laboratory of Chemistry for Inorganic/Organic Hybrid Functionalized Materials and Key Laboratory of Functional Inorganic Materials of Anhui Province, College of Chemistry & Chemical Engineering, Anhui University, Hefei, Anhui 230601, People's Republic of China.
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4
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Morozkov GV, Abel AS, Lyssenko KA, Roznyatovsky VA, Averin AD, Beletskaya IP, Bessmertnykh-Lemeune A. Ruthenium(II) complexes with phosphonate-substituted phenanthroline ligands as reusable photoredox catalysts. Dalton Trans 2024; 53:535-551. [PMID: 38053435 DOI: 10.1039/d3dt02936k] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/07/2023]
Abstract
Ru(II) complexes with polypyridyl ligands (2,2'-bipyridine = bpy, 1,10-phenanthroline = phen) play a central role in the development of photocatalytic organic reactions. In this work, we synthesized four mixed-ligand [Ru(phen)(bpy)2]2+-type complexes (Ru-Pcat-A) bearing two phosphonate substituents P(O)(OH)(OR) (R = H, Et) attached to the phen core at positions 3,8 (Ru-3,8PH and Ru-3,8PHEt) and 4,7 (Ru-4,7PH and Ru-4,7PHEt) of the heterocycle in high yields (87-99%) and characterized them using spectral methods. Single crystal X-ray diffraction was employed to determine the coordination mode of the ditopic phen ligand in Ru-4,7PH. This complex exists as the neutral species and forms a 1D hydrogen-bonded framework in the crystals. The light absorption characteristics were found to be similar for all complexes prepared in this work. However, the emission maxima in aqueous solutions were significantly affected by the substitution of the heterocycle, ranging from 629 nm for Ru-4,7PH to 661 nm for Ru-3,8PHEt. The emission quantum yields in Ar-saturated deionized water showed a strong dependence on the substitution pattern of the phen ligand, with maximal values reaching approximately 0.11 for Ru-4,7PHEt and Ru-4,7PH, which is twice as high as that of the classical [Ru(bpy)3]2+ complex (Ru-bpy). The photocatalytic performance of Ru-Pcat-A was investigated using visible light photoredox catalytic transformations of tertiary amines. With Ru-Pcat-A, we achieved the phosphonylation of N-aryl-1,2,3,4-tetrahydroisoquinolines (THIQs) and cyanation of THIQs and N,N-dimethylaniline in methanol, while a mixture of nitromethane/methanol (1 : 1 v/v) proved to be the optimal solvent for conducting the nitromethylation of THIQs. In the majority of the studied reactions, Ru-4,7PHEt exhibited greater efficiency compared to Ru-bpy, and it could be easily separated from the products using water extraction and reused in the next catalytic cycle. We successfully performed seven consecutive nitromethylation and phosphonylation of N-phenyl-1,2,3,4-tetrahydroisoquinoline using the recycled homogeneous photoredox catalyst.
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Affiliation(s)
- Gleb V Morozkov
- Department of Chemistry, Lomonosov Moscow State University, Leninskie Gory, 1-3, Moscow 119991, Russian Federation.
| | - Anton S Abel
- Department of Chemistry, Lomonosov Moscow State University, Leninskie Gory, 1-3, Moscow 119991, Russian Federation.
| | - Konstantin A Lyssenko
- Department of Chemistry, Lomonosov Moscow State University, Leninskie Gory, 1-3, Moscow 119991, Russian Federation.
- National Research University Higher School of Economics, Miasnitskaya Str. 20, 101000, Moscow, Russian Federation.
| | - Vitaly A Roznyatovsky
- Department of Chemistry, Lomonosov Moscow State University, Leninskie Gory, 1-3, Moscow 119991, Russian Federation.
| | - Alexei D Averin
- Department of Chemistry, Lomonosov Moscow State University, Leninskie Gory, 1-3, Moscow 119991, Russian Federation.
| | - Irina P Beletskaya
- Department of Chemistry, Lomonosov Moscow State University, Leninskie Gory, 1-3, Moscow 119991, Russian Federation.
- Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences, Leninsky Pr. 31, Moscow 119071, Russian Federation
| | - Alla Bessmertnykh-Lemeune
- ENS de Lyon, UMR 5182, CNRS, Université Claude Bernard Lyon 1, Laboratoire de Chimie, 69342 Lyon, France.
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5
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Saha A, Sen C, Guin S, Das C, Maiti D, Sen S, Maiti D. Photoinduced [3+2] Cycloaddition of Carbenes and Nitriles: A Versatile Approach to Oxazole Synthesis. Angew Chem Int Ed Engl 2023; 62:e202308916. [PMID: 37843822 DOI: 10.1002/anie.202308916] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2023] [Revised: 10/13/2023] [Accepted: 10/13/2023] [Indexed: 10/17/2023]
Abstract
We have developed a photoinduced protocol for the synthesis of pharmaceutically important oxazole molecules using diazo- and nitrile-containing reactants. The process involves the initial photolysis of the diazo compound to afford singlet carbenes, which are tapped by nitriles in a [3+2] cycloaddition fashion to give substituted oxazoles. With di-nitrile compounds, useful bis-oxazoles were obtained. The applicability of the transformation is showcased through the expedient synthesis of small-molecule drugs and biologically relevant molecules such as felbinac, pimprinine, texamine, ugnenenazole etc. The protocol is also useful for the generation of 2 H and 13 C isotope labelled oxazoles. Merging photolysis with continuous-flow chemistry was demonstrated for scaling up the reaction. The non-requirement of metal catalysis or photosensitizers to harness the light energy with blue light sufficing the execution of the reaction makes it a versatile and general protocol for the synthesis of structurally diverse oxazoles.
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Affiliation(s)
- Argha Saha
- Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai, 400076, India
| | - Chiranjit Sen
- Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai, 400076, India
| | - Srimanta Guin
- Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai, 400076, India
| | - Chandan Das
- Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai, 400076, India
| | - Debajit Maiti
- Department of Chemistry, School of Natural Sciences, Shiv Nadar University, Uttar Pradesh, 201314, India
| | - Subhabrata Sen
- Department of Chemistry, School of Natural Sciences, Shiv Nadar University, Uttar Pradesh, 201314, India
| | - Debabrata Maiti
- Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai, 400076, India
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6
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Das B, Sahoo AK, Banjare SK, Panda SJ, Purohit CS, Doddi A. Dicationic copper(I) complexes bearing ENE (E = S, Se) pincer ligands; catalytic applications in regioselective cyclization of 1,6-diynes. Dalton Trans 2023; 52:16151-16158. [PMID: 37603440 DOI: 10.1039/d3dt01989f] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/23/2023]
Abstract
Two novel dicationic binuclear Cu(I) complexes of the type [{(BPPP)E2}Cu]2[BF4]2 (E = S (3a); Se (3b)) bearing (BPPP)E2 (BPPP = bis(diphenylphosphino)pyridine) pincer systems were isolated, and structurally characterized. The solid-state structures of 3a/3b display the presence of intermolecular cuprophilic (Cu⋯Cu) interactions between the two monocationic species, and consist of weak Cu⋯S bonding between the two cations. Besides, complex 3a was introduced as a molecular copper(I) catalyst in cyclization reactions, and new protocols were developed for the synthesis of a series of new oxazole and triazole derivatives bearing alkyne-phenyl propargylic ether substituents. 3a was also found to be active in achieving these two classes of heterocyclic compounds by the mechanical grinding method. One of the key intermediate copper-azide species was detected by the high-resolution mass spectrometry technique, which supports the proposed catalytic pathway. All the reported transformations were accomplished sustainably by employing a well-defined, earth-abundant, and cheap copper(I) catalytic system.
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Affiliation(s)
- Bhagyashree Das
- Department of Chemical Sciences, Indian Institute of Science Education and Research Berhampur, Transit Campus, Industrial Training Institute (ITI), Engineering School Road, Ganjam, 760010, Odisha, India.
| | - Amiya Kumar Sahoo
- Department of Chemical Sciences, Indian Institute of Science Education and Research Berhampur, Transit Campus, Industrial Training Institute (ITI), Engineering School Road, Ganjam, 760010, Odisha, India.
| | - Shyam Kumar Banjare
- School of Chemical Sciences, National Institute of Science Education and Research (NISER), Bhubaneswar, 752050, India
| | - Subhra Jyoti Panda
- School of Chemical Sciences, National Institute of Science Education and Research (NISER), Bhubaneswar, 752050, India
| | - Chandra Shekhar Purohit
- School of Chemical Sciences, National Institute of Science Education and Research (NISER), Bhubaneswar, 752050, India
| | - Adinarayana Doddi
- Department of Chemical Sciences, Indian Institute of Science Education and Research Berhampur, Transit Campus, Industrial Training Institute (ITI), Engineering School Road, Ganjam, 760010, Odisha, India.
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7
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Sugitate K, Yamashiro T, Takahashi I, Yamada K, Abe T. Oxytrofalcatin Puzzle: Total Synthesis and Structural Revision of Oxytrofalcatins B and C. J Org Chem 2023. [PMID: 37433109 DOI: 10.1021/acs.joc.3c00691] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/13/2023]
Abstract
The previously reported structures of oxytrofalcatins B and C possess a benzoyl indole core. However, following synthesis and NMR comparison of both the proposed structure and the synthesized oxazole, we have revised the structure of oxytrofalcatins B and C as oxazoles. The synthetic route developed herein can further our understanding of the biosynthetic pathways that govern the production of natural 2,5-diaryloxazoles.
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Affiliation(s)
- Kazuma Sugitate
- Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama University, 1-1-1 Tsushima-naka, Kita-ku, Okayama 7008530, Japan
| | - Toshiki Yamashiro
- Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama University, 1-1-1 Tsushima-naka, Kita-ku, Okayama 7008530, Japan
| | - Ibuki Takahashi
- Faculty of Pharmaceutical Sciences, Health Sciences University of Hokkaido, Ishikari-tobetsu, Hokkaido 0610293, Japan
| | - Koji Yamada
- Faculty of Pharmaceutical Sciences, Health Sciences University of Hokkaido, Ishikari-tobetsu, Hokkaido 0610293, Japan
| | - Takumi Abe
- Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama University, 1-1-1 Tsushima-naka, Kita-ku, Okayama 7008530, Japan
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8
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Li M, He Z, Zhao W, Yu Y, Huang F, Baell JB. Photocatalytic Benzylic C-H Oxidation/Cyclization of Enaminones to the Synthesis of Polysubstituted Oxazoles. J Org Chem 2023. [PMID: 37262016 DOI: 10.1021/acs.joc.3c00269] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
Photocatalytic benzylic C-H oxidation/cyclization of enaminones was efficiently achieved to afford oxazole derivatives under mild conditions. The oxygen in the oxazole ring originated from green oxidant molecular oxygen. The synthetic protocol features broad substrate scopes and good functional group tolerance. The combined experimental and theoretical studies reveal that in suit benzylic C-H oxidation/cyclization is involved in the reaction transformations.
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Affiliation(s)
- Mingrui Li
- School of Pharmaceutical Sciences, Nanjing Tech University, Nanjing 211816, P. R. China
| | - Zhiqin He
- School of Food Science and Pharmaceutical Engineering, Nanjing Normal University, Nanjing 210023, P. R. China
| | - Wei Zhao
- School of Food Science and Pharmaceutical Engineering, Nanjing Normal University, Nanjing 210023, P. R. China
| | - Yang Yu
- School of Environmental Science and Engineering, Nanjing Tech University, Nanjing 211816, P. R. China
| | - Fei Huang
- School of Pharmaceutical Sciences, Nanjing Tech University, Nanjing 211816, P. R. China
| | - Jonathan B Baell
- School of Pharmaceutical Sciences, Nanjing Tech University, Nanjing 211816, P. R. China
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9
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Zhang X, Wang H, Li Z, Shu Y, Gan S, Zhang X, Shao H, Wang C. Chemodivergent Synthesis of Aza-Heterocycles with a Quarternary Carbon Center via [4 + 1] Annulation between Azoalkenes and α-Bromo Carbonyl Compounds. ACS OMEGA 2022; 7:40963-40972. [PMID: 36406503 PMCID: PMC9670695 DOI: 10.1021/acsomega.2c04127] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/01/2022] [Accepted: 10/12/2022] [Indexed: 06/16/2023]
Abstract
An efficient [4 + 1] annulation reaction between in situ generated azoalkene intermediates and α-bromocarbonyls has been established. A series of skeletally diverse aza-heterocycles with a functionalized quaternary center were obtained in up to 89% yield under mild conditions.
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Affiliation(s)
- Xiaoke Zhang
- Central
Laboratory, Chongqing University FuLing
Hospital, Chongqing 408000, P.R. China
- Zunyi
Medical University, Zunyi, Guizhou 563000, P.R. China
| | - Haibo Wang
- Zhejiang
Hongyuan Pharmaceutical Co., Ltd., Chem & APIs, Industrial Zone, Linhai, Taizhou 310001, Zhejiang, P.R. China
| | - Ziwei Li
- Central
Laboratory, Chongqing University FuLing
Hospital, Chongqing 408000, P.R. China
| | - Yan Shu
- Central
Laboratory, Chongqing University FuLing
Hospital, Chongqing 408000, P.R. China
| | - Song Gan
- Zunyi
Medical University, Zunyi, Guizhou 563000, P.R. China
| | - Xuefang Zhang
- Zunyi
Medical University, Zunyi, Guizhou 563000, P.R. China
| | - Huawu Shao
- Natural
Products Research Centre, Chengdu Institute of Biology, Chinese Academy of Sciences, Chengdu 100045, P.R. China
| | - Chaoyong Wang
- Central
Laboratory, Chongqing University FuLing
Hospital, Chongqing 408000, P.R. China
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10
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Newar UD, Borra S, Maurya RA. Visible-Light 2,4-Dinitrophenol-Mediated Photoannulation of α-Azidochalcones into 2,5-Diaryloxazoles. Org Lett 2022; 24:4454-4458. [PMID: 35700202 DOI: 10.1021/acs.orglett.2c01691] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A novel and efficient visible-light 2,4-dinitrophenol (2,4-DNP) mediated photoannulation of α-azidochalcones into 2,5-diaryloxazoles was developed. The carbon-carbon double bond of α-azidochalcone was cleaved, leading to the formation of new C-O and C-N bonds in the photoannulation. Control experiments were carried out, and a plausible mechanism of the photoannulation was proposed. The scope of the reaction was studied by synthesizing a series of 2,5-diaryloxazoles including two naturally occurring oxazoles (Texamine and Balsoxin) in excellent yields.
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Affiliation(s)
- Uma Devi Newar
- Applied Organic Chemistry Group, Chemical Sciences & Technology Division, CSIR-North East Institute of Science & Technology (NEIST), Jorhat 785006, India.,Academy of Scientific and Innovative Research (AcSIR), Ghaziabad 201002, India
| | - Satheesh Borra
- Applied Organic Chemistry Group, Chemical Sciences & Technology Division, CSIR-North East Institute of Science & Technology (NEIST), Jorhat 785006, India.,Academy of Scientific and Innovative Research (AcSIR), Ghaziabad 201002, India
| | - Ram Awatar Maurya
- Applied Organic Chemistry Group, Chemical Sciences & Technology Division, CSIR-North East Institute of Science & Technology (NEIST), Jorhat 785006, India
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11
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Kadu VD. Recent Advances for Synthesis of Oxazole Heterocycles
via
C‐H/C‐N Bond Functionalization of Benzylamines. ChemistrySelect 2022. [DOI: 10.1002/slct.202104028] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Affiliation(s)
- Vikas D. Kadu
- School of Chemical Sciences Punyashlok Ahilyadevi Holkar Solapur University Solapur 413255 Maharashtra India
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12
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Dashti M, Nikpassand M, Mokhtary M, Fekri LZ. Sustainable Synthesis of Azo-Linked 4-Arylidene-2-Aryloxazolones Using Fe3O4@SiPr@vanillin@TGA Nanocomposite. J CLUST SCI 2022. [DOI: 10.1007/s10876-022-02279-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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13
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KI-TBHP mediated cascade oxidative annulations of enaminones: A facile approach towards 2, 4, 5-Trisubstituted oxazoles. Tetrahedron 2022. [DOI: 10.1016/j.tet.2022.132906] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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14
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Yang X, Guo X, Yuan X, Chen B. K 2S 2O 8-promoted rearrangement of nitrones for the synthesis of benzo[ d]oxazoles. Org Chem Front 2022. [DOI: 10.1039/d2qo00680d] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
An efficient route for the synthesis of valuable benzoxazoles has been developed through self-oxidative cyclization with N–O bond cleavage.
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Affiliation(s)
- Xueying Yang
- State Key Laboratory of Applied Organic Chemistry, Key Laboratory of Nonferrous Metal Chemistry and Resources Utilization of Gansu Province, Department of Chemistry, Lanzhou University, Lanzhou, Gansu, China
| | - Xin Guo
- School of Chemistry and Chemical Engineering, North Minzu University, Yinchuan, China
| | - Xinglong Yuan
- State Key Laboratory of Applied Organic Chemistry, Key Laboratory of Nonferrous Metal Chemistry and Resources Utilization of Gansu Province, Department of Chemistry, Lanzhou University, Lanzhou, Gansu, China
| | - Baohua Chen
- State Key Laboratory of Applied Organic Chemistry, Key Laboratory of Nonferrous Metal Chemistry and Resources Utilization of Gansu Province, Department of Chemistry, Lanzhou University, Lanzhou, Gansu, China
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15
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Srivastava V, Singh PK, Tivari S, Singh PP. Visible light photocatalysis in the synthesis of pharmaceutically relevant heterocyclic scaffolds. Org Chem Front 2022. [DOI: 10.1039/d1qo01602d] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
Visible light and photoredox catalysis have emerged as a powerful and long-lasting tool for organic synthesis, demonstrating the importance of a variety of chemical bond formation methods.
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Affiliation(s)
- Vishal Srivastava
- Department of Chemistry, CMP Degree College, University of Allahabad, Prayagraj 211002, India
| | - Pravin K. Singh
- Department of Chemistry, CMP Degree College, University of Allahabad, Prayagraj 211002, India
| | - Shraddha Tivari
- Department of Chemistry, CMP Degree College, University of Allahabad, Prayagraj 211002, India
| | - Praveen P. Singh
- Department of Chemistry, United College of Engineering & Research, Naini, Prayagraj 211010, India
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16
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Zhou SY, Zhang D, Liu XJ, Qin JH, Fu ZL, Li SL, Cai FJ, Li Y, Li JH. Visible-Light-Driven Photoredox-Catalyzed C(sp3)-C(sp3) Cross-Coupling of N-arylamines with Cycloketone Oxime Esters. Org Chem Front 2022. [DOI: 10.1039/d2qo00128d] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A novel photoredox-catalyzed C(sp3)-C(sp3) cross-coupling between N-arylamines and cycloketone oxime esters under mild conditions has been accomplished. The redox-neutral reaction proceeds good functional group tolerance and excellent regioselectivity without any...
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17
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Neha K, Ali F, Haider K, Khasimbi S, Wakode S. Synthetic approaches for oxazole derivatives: A review. SYNTHETIC COMMUN 2021. [DOI: 10.1080/00397911.2021.1986843] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Affiliation(s)
- Kumari Neha
- Department of Pharmaceutical Chemistry, Delhi Institute of Pharmaceutical Sciences and Research (DIPSAR), DPSRU, New Delhi, India
| | - Faraat Ali
- Department of Inspection and Enforcement, Laboratory services, Botswana Medicines Regulatory Authority, Gaborone, Botswana
| | - Kashif Haider
- Department of Pharmaceutical Chemistry, School of Pharmaceutical Education and Research, Jamia Hamdard (Deemed to be University), New Delhi, India
| | - Shaik Khasimbi
- Department of Pharmaceutical Chemistry, Delhi Institute of Pharmaceutical Sciences and Research (DIPSAR), DPSRU, New Delhi, India
| | - Sharad Wakode
- Department of Pharmaceutical Chemistry, Delhi Institute of Pharmaceutical Sciences and Research (DIPSAR), DPSRU, New Delhi, India
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18
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Zenkov IS, Yakushev AA, Abel AS, Averin AD, Bessmertnykh-Lemeune AG, Beletskaya IP. Photocatalytic Activity of Ruthenium(II) Complex with 1,10-Phenanthroline-3,8-dicarboxylic Acid in Aerobic Oxidation Reactions. RUSSIAN JOURNAL OF ORGANIC CHEMISTRY 2021. [DOI: 10.1134/s1070428021090025] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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19
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Narita K, Suganuma K, Murata T, Kondo R, Satoh H, Watanabe K, Sasaki K, Inoue N, Yoshimura Y. Synthesis and evaluation of trypanocidal activity of derivatives of naturally occurring 2,5-diphenyloxazoles. Bioorg Med Chem 2021; 42:116253. [PMID: 34130218 DOI: 10.1016/j.bmc.2021.116253] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2021] [Revised: 05/25/2021] [Accepted: 05/28/2021] [Indexed: 10/21/2022]
Abstract
African trypanosomiasis is a zoonotic protozoan disease affecting the nervous system. Various natural products reportedly exhibit trypanocidal activity. Naturally occurring 2,5-diphenyloxazoles present in Oxytropis lanata, and their derivatives, were synthesized. The trypanocidal activities of the synthesized compounds were evaluated against Trypanosoma brucei brucei, T. b. gambiense, T. b. rhodesiense, T. congolense, and T. evansi. Natural product 1 exhibited trypanocidal activity against all the species/subspecies of trypanosomes, exhibiting half-maximal inhibitory concentrations (IC50) of 1.1-13.5 μM. Modification of the oxazole core improved the trypanocidal activity. The 1,3,4-oxadiazole (7) and 2,4-diphenyloxazole (9) analogs exhibited potency superior to that of 1. However, these compounds exhibited cytotoxicity in Madin-Darby bovine kidney cells. The O-methylated analog of 1 (12) was non-cytotoxic and exhibited selective trypanocidal activity against T. congolense (IC50 = 0.78 µM). Structure-activity relationship studies of the 2,5-diphenyloxazole analogs revealed aspects of the molecular structure critical for maintaining selective trypanocidal activity against T. congolense.
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Affiliation(s)
- Koichi Narita
- Faculty of Pharmaceutical Sciences, Tohoku Medical and Pharmaceutical University, 4-4-1 Komatsushima, Aoba-ku, Sendai 981-8558, Japan.
| | - Keisuke Suganuma
- National Research Center for Protozoan Diseases, Obihiro University of Agriculture and Veterinary Medicine, Inada, Obihiro, Hokkaido 080-8555, Japan
| | - Toshihiro Murata
- Faculty of Pharmaceutical Sciences, Tohoku Medical and Pharmaceutical University, 4-4-1 Komatsushima, Aoba-ku, Sendai 981-8558, Japan
| | - Ryutaro Kondo
- Faculty of Pharmaceutical Sciences, Tohoku Medical and Pharmaceutical University, 4-4-1 Komatsushima, Aoba-ku, Sendai 981-8558, Japan
| | - Hiroka Satoh
- Faculty of Pharmaceutical Sciences, Tohoku Medical and Pharmaceutical University, 4-4-1 Komatsushima, Aoba-ku, Sendai 981-8558, Japan
| | - Kazuhiro Watanabe
- Faculty of Pharmaceutical Sciences, Tohoku Medical and Pharmaceutical University, 4-4-1 Komatsushima, Aoba-ku, Sendai 981-8558, Japan
| | - Kenroh Sasaki
- Faculty of Pharmaceutical Sciences, Tohoku Medical and Pharmaceutical University, 4-4-1 Komatsushima, Aoba-ku, Sendai 981-8558, Japan
| | - Noboru Inoue
- National Research Center for Protozoan Diseases, Obihiro University of Agriculture and Veterinary Medicine, Inada, Obihiro, Hokkaido 080-8555, Japan
| | - Yuichi Yoshimura
- Faculty of Pharmaceutical Sciences, Tohoku Medical and Pharmaceutical University, 4-4-1 Komatsushima, Aoba-ku, Sendai 981-8558, Japan
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20
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Basson AJ, McLaughlin MG. Sustainable Access to 5-Amino-Oxazoles and Thiazoles via Calcium-Catalyzed Elimination-Cyclization with Isocyanides. CHEMSUSCHEM 2021; 14:1696-1699. [PMID: 33605021 PMCID: PMC8048476 DOI: 10.1002/cssc.202100225] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 01/28/2021] [Revised: 02/18/2021] [Indexed: 06/12/2023]
Abstract
Herein, we report a sustainable, modular, rapid and high-yielding transformation to afford densely functionalized 5-aminooxazoles and thiazoles. The reaction is tolerant to a wide range of functional groups and is typically complete in under 30 min. Furthermore, the described transformation is inherently green in relation to the catalyst and solvent choice as well as producing environmentally benign alcoholic by-products.
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Affiliation(s)
- Ashley J. Basson
- Department of Natural SciencesManchester Metropolitan UniversityChester StreetManchesterM1 5GDUnited Kingdom
| | - Mark G. McLaughlin
- Department of Natural SciencesManchester Metropolitan UniversityChester StreetManchesterM1 5GDUnited Kingdom
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21
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22
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Liang F, Liu K, Zhao C, Shang Z, Kong H, Yin Y, Zhu Y, Sun Y, Yao J. Convergent Domino Cyclization: Oxidative [3+1+1] Annulation for One‐Pot Synthesis of 2‐Quinoline‐4,5‐diaryl‐oxazoles from Methyl Azaarenes, Benzoins and NH
4
OAc. European J Org Chem 2021. [DOI: 10.1002/ejoc.202001561] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Affiliation(s)
- Fei‐Fei Liang
- School of Pharmacy, Key Laboratory of Molecular Pharmacology and Drug Evaluation, Ministry of Education Collaborative Innovation Center of Advanced Drug Delivery System and Biotech Drugs in Universities of Shandong, Yantai University Shandong, Yantai 264005 P. R. China
| | - Kai‐Xuan Liu
- School of Pharmacy, Key Laboratory of Molecular Pharmacology and Drug Evaluation, Ministry of Education Collaborative Innovation Center of Advanced Drug Delivery System and Biotech Drugs in Universities of Shandong, Yantai University Shandong, Yantai 264005 P. R. China
| | - Cong Zhao
- School of Pharmacy, Key Laboratory of Molecular Pharmacology and Drug Evaluation, Ministry of Education Collaborative Innovation Center of Advanced Drug Delivery System and Biotech Drugs in Universities of Shandong, Yantai University Shandong, Yantai 264005 P. R. China
| | - Zhi‐Hao Shang
- School of Pharmacy, Key Laboratory of Molecular Pharmacology and Drug Evaluation, Ministry of Education Collaborative Innovation Center of Advanced Drug Delivery System and Biotech Drugs in Universities of Shandong, Yantai University Shandong, Yantai 264005 P. R. China
| | - Hong‐Mei Kong
- School of Pharmacy, Key Laboratory of Molecular Pharmacology and Drug Evaluation, Ministry of Education Collaborative Innovation Center of Advanced Drug Delivery System and Biotech Drugs in Universities of Shandong, Yantai University Shandong, Yantai 264005 P. R. China
| | - Ya‐Qing Yin
- School of Pharmacy, Key Laboratory of Molecular Pharmacology and Drug Evaluation, Ministry of Education Collaborative Innovation Center of Advanced Drug Delivery System and Biotech Drugs in Universities of Shandong, Yantai University Shandong, Yantai 264005 P. R. China
| | - Yan‐Ping Zhu
- School of Pharmacy, Key Laboratory of Molecular Pharmacology and Drug Evaluation, Ministry of Education Collaborative Innovation Center of Advanced Drug Delivery System and Biotech Drugs in Universities of Shandong, Yantai University Shandong, Yantai 264005 P. R. China
| | - Yuan‐Yuan Sun
- School of Pharmacy, Key Laboratory of Molecular Pharmacology and Drug Evaluation, Ministry of Education Collaborative Innovation Center of Advanced Drug Delivery System and Biotech Drugs in Universities of Shandong, Yantai University Shandong, Yantai 264005 P. R. China
| | - Jian‐Wen Yao
- School of Pharmacy, Key Laboratory of Molecular Pharmacology and Drug Evaluation, Ministry of Education Collaborative Innovation Center of Advanced Drug Delivery System and Biotech Drugs in Universities of Shandong, Yantai University Shandong, Yantai 264005 P. R. China
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23
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Sofi FA, Bharatam PV. Synthesis of Drugs and Biorelevant N-heterocycles Employing Recent Advances in C-N Bond Formation. CURR ORG CHEM 2020. [DOI: 10.2174/1385272824999200909114144] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Abstract
C-N bond formation is a particularly important step in the generation of many
biologically relevant heterocyclic molecules. Several methods have been reported for this
purpose over the past few decades. Well-known named reactions like Ullmann-Goldberg
coupling, Buchwald-Hartwig coupling and Chan-Lam coupling are associated with the C-N
bond formation reactions. Several reviews covering this topic have already been published.
However, no comprehensive review covering the synthesis of drugs/ lead compounds using
the C-N bond formation reactions was reported. In this review, we cover many modern
methods of the C-N bond formation reactions, with special emphasis on metal-free and
green chemistry methods. We also report specific strategies adopted for the synthesis of
drugs, which involve the C-N bond formation reactions. Examples include anti-cancer,
antidepressant, anti-inflammatory, anti-atherosclerotic, anti-histaminic, antibiotics, antibacterial, anti-rheumatic,
antiepileptic and anti-diabetic agents. Many recently developed lead compounds generated using the C-N bond
formation reactions are also covered in this review. Examples include MAP kinase inhibitors, TRKs inhibitors,
Polo-like Kinase inhibitors and MPS1 inhibitors.
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Affiliation(s)
- Firdoos Ahmad Sofi
- Department of Medicinal Chemistry, National Institute of Pharmaceutical Education and Research (NIPER), Sector 67, S.A.S Nagar 160 062, Punjab, India
| | - Prasad V. Bharatam
- Department of Medicinal Chemistry, National Institute of Pharmaceutical Education and Research (NIPER), Sector 67, S.A.S Nagar 160 062, Punjab, India
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24
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Talukdar R. Tracking down the brominated single electron oxidants in recent organic red-ox transformations: photolysis and photocatalysis. Org Biomol Chem 2020; 18:8294-8345. [PMID: 33020775 DOI: 10.1039/d0ob01652g] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
A wide range of organic and inorganic brominated compounds including molecular bromine have been extensively used as oxidants in many organic photo-redox transformations in recent years, an area of ever growing interest because of greener and milder approaches. The oxidation power of these compounds is utilized through both mechanistic pathways (by hydrogen atom transfer or HAT in the absence of a photocatalyst and a combination of single electron transfer or SET and/or HAT in the presence of a photocatalyst). Not only as terminal oxidants for regeneration of photocatalysts, but brominated reactants have also contributed to the oxidation of the reaction intermediate(s) to carry on the radical chain process in several reactions. Here in this review mainly the non-brominative oxidative product formations are discussed, carried out since the last two decades, skipping the instances where they acted as terminal oxidants only to regenerate photocatalysts. The reactions are used to generate natural products, pharmaceuticals and beyond.
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Affiliation(s)
- Ranadeep Talukdar
- Molecular Synthesis and Drug Discovery Laboratory, Centre of Biomedical Research, Sanjay Gandhi Postgraduate Institute of Medical Sciences, Lucknow-226014, India.
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25
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Roy Chowdhury S, Singh D, Hoque IU, Maity S. Organic Dye-Catalyzed Intermolecular Radical Coupling of α-Bromocarbonyls with Olefins: Photocatalytic Synthesis of 1,4-Ketocarbonyls Using Air as an Oxidant. J Org Chem 2020; 85:13939-13950. [DOI: 10.1021/acs.joc.0c01985] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Affiliation(s)
| | - Deepak Singh
- Department of Chemistry, Indian Institute of Technology (ISM) Dhanbad, JH 826004, India
| | - Injamam Ul Hoque
- Department of Chemistry, Indian Institute of Technology (ISM) Dhanbad, JH 826004, India
| | - Soumitra Maity
- Department of Chemistry, Indian Institute of Technology (ISM) Dhanbad, JH 826004, India
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26
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Yang S, Yang Y, Li F, Liu X. NIS-TBHP promoted oxidative coupling of C N and C O bonds: A metal-free approach to polysubstituted oxazoles. Tetrahedron Lett 2020. [DOI: 10.1016/j.tetlet.2020.151846] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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27
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Dai L, Yu S, Xiong W, Chen Z, Xu T, Shao Y, Chen J. Divergent Palladium‐Catalyzed Tandem Reaction of Cyanomethyl Benzoates with Arylboronic Acids: Synthesis of Oxazoles and Isocoumarins. Adv Synth Catal 2020. [DOI: 10.1002/adsc.202000125] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Affiliation(s)
- Ling Dai
- College of Chemistry and Materials EngineeringWenzhou University Wenzhou 325035 People's Republic of China
| | - Shuling Yu
- College of Chemistry and Materials EngineeringWenzhou University Wenzhou 325035 People's Republic of China
| | - Wenzhang Xiong
- College of Chemistry and Materials EngineeringWenzhou University Wenzhou 325035 People's Republic of China
| | - Zhongyan Chen
- College of Chemistry and Materials EngineeringWenzhou University Wenzhou 325035 People's Republic of China
| | - Tong Xu
- College of Chemistry and Materials EngineeringWenzhou University Wenzhou 325035 People's Republic of China
| | - Yinlin Shao
- College of Chemistry and Materials EngineeringWenzhou University Wenzhou 325035 People's Republic of China
| | - Jiuxi Chen
- College of Chemistry and Materials EngineeringWenzhou University Wenzhou 325035 People's Republic of China
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28
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Li J, Zhu SR, Xu Y, Lu XC, Wang ZB, Liu L, Xu DF. Synthesis of 2,5-diaryloxazoles through rhodium-catalyzed annulation of triazoles and aldehydes. RSC Adv 2020; 10:24795-24799. [PMID: 35517461 PMCID: PMC9055139 DOI: 10.1039/d0ra03966g] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2020] [Accepted: 06/11/2020] [Indexed: 02/01/2023] Open
Abstract
An efficient synthesis of a variety of 2,5-diaryloxazole derivatives via a rhodium-catalyzed annulation of triazoles and aldehydes is achieved. Various oxazole derivatives could be obtained in good to excellent yields. A concise synthesis of antimycobaterial natural products balsoxin and texamine has been achieved using this method. An efficient synthesis of a variety of 2,5-diaryloxazole derivatives via a rhodium-catalyzed annulation of triazoles and aldehydes is achieved.![]()
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Affiliation(s)
- Jian Li
- Jiangsu Key Laboratory of Advanced Catalytic Materials and Technology
- School of Pharmaceutical Engineering & Life Sciences
- Changzhou University
- Changzhou
- China
| | - Shang-Rong Zhu
- Jiangsu Key Laboratory of Advanced Catalytic Materials and Technology
- School of Pharmaceutical Engineering & Life Sciences
- Changzhou University
- Changzhou
- China
| | - Yue Xu
- Jiangsu Key Laboratory of Advanced Catalytic Materials and Technology
- School of Pharmaceutical Engineering & Life Sciences
- Changzhou University
- Changzhou
- China
| | - Xue-Chen Lu
- Jiangsu Key Laboratory of Advanced Catalytic Materials and Technology
- School of Pharmaceutical Engineering & Life Sciences
- Changzhou University
- Changzhou
- China
| | - Zheng-Bing Wang
- Jiangsu Key Laboratory of Advanced Catalytic Materials and Technology
- School of Pharmaceutical Engineering & Life Sciences
- Changzhou University
- Changzhou
- China
| | - Li Liu
- Jiangsu Key Laboratory of Advanced Catalytic Materials and Technology
- School of Pharmaceutical Engineering & Life Sciences
- Changzhou University
- Changzhou
- China
| | - De-feng Xu
- Jiangsu Key Laboratory of Advanced Catalytic Materials and Technology
- School of Pharmaceutical Engineering & Life Sciences
- Changzhou University
- Changzhou
- China
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29
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Debnath S, Das T, Gayen S, Ghosh T, Maiti DK. Iodine-Catalyzed Functionalization of Primary Aliphatic Amines to Oxazoles, 1,4-Oxazines, and Oxazinones. ACS OMEGA 2019; 4:20410-20422. [PMID: 31815245 PMCID: PMC6894181 DOI: 10.1021/acsomega.9b03501] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/21/2019] [Accepted: 11/01/2019] [Indexed: 05/10/2023]
Abstract
Unprecedented I2-catalyzed α,α-C(sp3)-H, decarboxylative α-C(sp3)-H, lactonized α-C(sp3)-H, and α,β-C(sp3)-H functionalized 5- and 6-annulation as well as α-C(sp3)-H activated 6-lactonization of primary aliphatic amines are devised under aerobic conditions. The metal-free sustainable strategy was employed for the diverse construction of valuable five-and six-membered polycyclic N,O-heteroaromatics such as oxazoles, 1,4-oxazines, and oxazin-2-one with a rapid reaction rate and high yield. The viability of this mild nonmetallic catalysis is successfully verified through syntheses of labile chiral heterocyclic analogues. In contrast to the common practice, this method is not limited to use of prefunctionalized amines, directing groups (DGs) and/or transient DGs, metal catalysts, and traditional oxidants. The possible mechanistic pathway of the annulation reaction is investigated by control experiments and ESI-MS data collected for a reaction mixture of the ongoing reaction. The synthesized new compounds are potent organic nanobuilding blocks to achieve valuable organic nanomaterials of different sizes, shapes, and dimensions, which are under investigation for the discovery of high-tech devices of innovative organic nanoelectronics and photophysical properties.
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Affiliation(s)
- Sudipto Debnath
- Department
of Chemistry, University of Calcutta, 92 A. P. C. Road, Kolkata 700009, India
| | - Tuluma Das
- Department
of Chemistry, University of Calcutta, 92 A. P. C. Road, Kolkata 700009, India
| | - Subrata Gayen
- Department
of Chemistry, University of Calcutta, 92 A. P. C. Road, Kolkata 700009, India
| | - Tapas Ghosh
- Department
of Applied Sciences, Maulana Abul Kalam
Azad University of Technology, Haringhata 741249, West Bengal, India
| | - Dilip K. Maiti
- Department
of Chemistry, University of Calcutta, 92 A. P. C. Road, Kolkata 700009, India
- E-mail:
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30
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Zamani P, Phipps J, Hu J, Cheema F, Amiri Rudbari H, Bordbar AK, Khosropour AR, Beyzavi H. Multicomponent Synthesis of Diversified Chromeno[3,2- d]oxazoles. ACS COMBINATORIAL SCIENCE 2019; 21:557-561. [PMID: 31276369 DOI: 10.1021/acscombsci.9b00084] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
A practical and efficient synthetic procedure to novel chromeno[3,2-d]oxazoles through a one-pot sequential multistep process is presented. This procedure proceeds efficiently in propylene carbonate (PC) as a green solvent and affords a wide range of the chromenooxazole scaffolds.
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Affiliation(s)
- Parisa Zamani
- Department of Chemistry, University of Isfahan, Isfahan 81746-73441, Iran
| | - Joshua Phipps
- Cell and Molecular Biology Program, University of Arkansas, Fayetteville, Arkansas 72701, United States
| | - Jiyun Hu
- Department of Chemistry and Biochemistry, University of Arkansas, Fayetteville, Arkansas 72701, United States
| | - Faizan Cheema
- Department of Chemistry and Biochemistry, University of Arkansas, Fayetteville, Arkansas 72701, United States
| | - Hadi Amiri Rudbari
- Department of Chemistry, University of Isfahan, Isfahan 81746-73441, Iran
| | | | - Ahmad R. Khosropour
- Department of Chemistry, University of Isfahan, Isfahan 81746-73441, Iran
- Department of Chemistry and Biochemistry, University of Arkansas, Fayetteville, Arkansas 72701, United States
| | - Hudson Beyzavi
- Cell and Molecular Biology Program, University of Arkansas, Fayetteville, Arkansas 72701, United States
- Department of Chemistry and Biochemistry, University of Arkansas, Fayetteville, Arkansas 72701, United States
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31
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Zhang X, He Y, Li J, Wang R, Gu L, Li G. CO 2/Photoredox-Cocatalyzed Tandem Oxidative Cyclization of α-Bromo Ketones and Amines To Construct Substituted Oxazoles. J Org Chem 2019; 84:8225-8231. [PMID: 31117554 DOI: 10.1021/acs.joc.9b00283] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
CO2/photoredox-cocatalyzed tandem oxidative cyclization of α-bromo ketones and amines for the preparation of substituted oxazoles has been achieved. The avoidance of using both transition-metal catalysts and peroxides makes this method more sustainable and renewable.
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Affiliation(s)
- Xiaowei Zhang
- School of Chemistry and Environment , Yunnan Minzu University , Kunming , Yunnan 650500 , China
| | - Yonghui He
- Key Laboratory of Chemistry in Ethnic Medicinal Resources, State Ethnic Affairs Commission & Ministry of Education , Yunnan Minzu University , Kunming , Yunnan 650500 , China
| | - Jing Li
- Key Laboratory of Chemistry in Ethnic Medicinal Resources, State Ethnic Affairs Commission & Ministry of Education , Yunnan Minzu University , Kunming , Yunnan 650500 , China
| | - Rui Wang
- School of Chemistry and Environment , Yunnan Minzu University , Kunming , Yunnan 650500 , China
| | - Lijun Gu
- Key Laboratory of Chemistry in Ethnic Medicinal Resources, State Ethnic Affairs Commission & Ministry of Education , Yunnan Minzu University , Kunming , Yunnan 650500 , China.,Key Laboratory of Green Pesticide and Agricultural Bioengineering, Ministry of Education , Guizhou University , Guiyang 550025 , China
| | - Ganpeng Li
- Key Laboratory of Chemistry in Ethnic Medicinal Resources, State Ethnic Affairs Commission & Ministry of Education , Yunnan Minzu University , Kunming , Yunnan 650500 , China
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32
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Banerji B, Adhikary S, Majumder L, Ghosh S. A Green Synthetic Approach towards Polyarylated Oxazoles via Iodine‐Catalyzed One‐Pot sp
3
C−H Functionalization in Water: From Natural Product Synthesis To Photophysical Studies. ASIAN J ORG CHEM 2019. [DOI: 10.1002/ajoc.201800742] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Affiliation(s)
- Biswadip Banerji
- Organic and Medicinal Chemistry DivisionIndian Institute of Chemical Biology (CSIR-IICB) 4 Raja S. C. Mullick Road Kolkata 700032 India
- Academy of Scientific and Innovative Research (AcSIR)Indian Institute of Chemical Biology (CSIR-IICB) 4 Raja S. C. Mullick Road Kolkata 700032 India
| | - Saswati Adhikary
- Organic and Medicinal Chemistry DivisionIndian Institute of Chemical Biology (CSIR-IICB) 4 Raja S. C. Mullick Road Kolkata 700032 India
| | - Leena Majumder
- Organic and Medicinal Chemistry DivisionIndian Institute of Chemical Biology (CSIR-IICB) 4 Raja S. C. Mullick Road Kolkata 700032 India
| | - Saswati Ghosh
- Organic and Medicinal Chemistry DivisionIndian Institute of Chemical Biology (CSIR-IICB) 4 Raja S. C. Mullick Road Kolkata 700032 India
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33
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Cao Z, Lv H, Liu Y, Nie Z, Liu H, Yang T, Luo W, Liu Q, Guo C. Dimethyl Sulfoxide Oxygen Donor‐Based Annulation of Ketones and Ammonium Persulfate: Regioselective Synthesis of 2,4‐disubstituted Oxazoles. Adv Synth Catal 2019. [DOI: 10.1002/adsc.201801671] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Zhongzhong Cao
- College of Chemistry and Chemical Engineering, Advanced Catalytic Engineering Research Center of the Ministry of EducationHunan University Changsha 410082 People's Republic of China
| | - Huifang Lv
- College of Chemistry and Chemical Engineering, Advanced Catalytic Engineering Research Center of the Ministry of EducationHunan University Changsha 410082 People's Republic of China
| | - Yufeng Liu
- College of Chemistry and Chemical Engineering, Advanced Catalytic Engineering Research Center of the Ministry of EducationHunan University Changsha 410082 People's Republic of China
| | - Zhiwen Nie
- College of Chemistry and Chemical Engineering, Advanced Catalytic Engineering Research Center of the Ministry of EducationHunan University Changsha 410082 People's Republic of China
| | - Haiping Liu
- College of Chemistry and Chemical Engineering, Advanced Catalytic Engineering Research Center of the Ministry of EducationHunan University Changsha 410082 People's Republic of China
| | - Tonglin Yang
- College of Chemistry and Chemical Engineering, Advanced Catalytic Engineering Research Center of the Ministry of EducationHunan University Changsha 410082 People's Republic of China
| | - Weiping Luo
- College of Chemistry and Chemical Engineering, Advanced Catalytic Engineering Research Center of the Ministry of EducationHunan University Changsha 410082 People's Republic of China
| | - Qiang Liu
- College of Chemistry and Chemical Engineering, Advanced Catalytic Engineering Research Center of the Ministry of EducationHunan University Changsha 410082 People's Republic of China
| | - Cancheng Guo
- College of Chemistry and Chemical Engineering, Advanced Catalytic Engineering Research Center of the Ministry of EducationHunan University Changsha 410082 People's Republic of China
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34
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Qi C, Peng Y, Wang L, Ren Y, Jiang H. Copper-Catalyzed [2 + 3] Cyclization of α-Hydroxyl Ketones and Arylacetonitriles: Access to Multisubstituted Butenolides and Oxazoles. J Org Chem 2018; 83:11926-11935. [DOI: 10.1021/acs.joc.8b01822] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
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35
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Soni VK, Kim J, Cho EJ. Organocatalytic Oxidative Cyclization of Amidoximes for the Synthesis of 1,2,4‐Oxadiazolines. Adv Synth Catal 2018. [DOI: 10.1002/adsc.201800238] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Vineet Kumar Soni
- Department of ChemistryChung-Ang University 84 Heukseok-ro, Dongjak-gu Seoul 06974 Republic of Korea
| | - Jun Kim
- Department of ChemistryChung-Ang University 84 Heukseok-ro, Dongjak-gu Seoul 06974 Republic of Korea
| | - Eun Jin Cho
- Department of ChemistryChung-Ang University 84 Heukseok-ro, Dongjak-gu Seoul 06974 Republic of Korea
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36
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Kumar SV, Acharya A, Ila H. Synthesis of 2,4,5-Trisubstituted Oxazoles with Complementary Regioselectivity from α-Oxoketene Dithioacetals and β-(Methylthio)-β-(het)aryl-2-propenones. J Org Chem 2018; 83:6607-6622. [DOI: 10.1021/acs.joc.8b00900] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Affiliation(s)
- Siripuram Vijay Kumar
- New Chemistry Unit, Jawaharlal Nehru Centre for Advanced Scientific Research(JNCASR), Jakkur, Bangalore 560064, India
| | - Anand Acharya
- New Chemistry Unit, Jawaharlal Nehru Centre for Advanced Scientific Research(JNCASR), Jakkur, Bangalore 560064, India
| | - Hiriyakkanavar Ila
- New Chemistry Unit, Jawaharlal Nehru Centre for Advanced Scientific Research(JNCASR), Jakkur, Bangalore 560064, India
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37
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Yang X, Guo X, Qin M, Yuan X, Jing H, Chen B. Metal-free iodine(iii)-promoted synthesis of 2,5-diaryloxazoles. Org Biomol Chem 2018; 16:3104-3108. [PMID: 29645044 DOI: 10.1039/c8ob00401c] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Abstract
A nonmetal-catalyzed oxidative cyclization to achieve 2,5-disubstituted oxazoles from inexpensive and readily available substituted chalcone, (diacetoxyiodo)benzene (PIDA) and ammonium acetate (NH4OAc) at room temperature is described. The reaction forms a variety of 2,5-diaryloxazoles in good to excellent yields with broad substrate scope under mild conditions without the requirement of ligands and additional bases.
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Affiliation(s)
- Xueying Yang
- State Key Laboratory of Applied Organic Chemistry, Lanzhou University, Lanzhou 730000, China
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38
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Chatterjee T, Kim DI, Cho EJ. Base-Promoted Synthesis of 2-Aryl Quinazolines from 2-Aminobenzylamines in Water. J Org Chem 2018; 83:7423-7430. [PMID: 29649359 DOI: 10.1021/acs.joc.8b00327] [Citation(s) in RCA: 38] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
A transition-metal-free procedure for the synthesis of a highly valuable class of heteroaromatics, quinazolines, was developed by using easily available 2-aminobenzylamines and α,α,α-trihalotoluenes. The transformation proceeded smoothly in the presence of only sodium hydroxide and molecular oxygen in water at 100 °C, furnishing a variety of 2-aryl quinazolines. The crystallization process of the crude reaction mixture for the purification of the solid products circumvents huge solvent-consuming workup and column chromatographic techniques, which make the overall process more sustainable and economical.
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Affiliation(s)
- Tanmay Chatterjee
- Department of Chemistry , Birla Institute of Technology & Science, Pilani , Hyderabad Campus, Jawahar Nagar, Shameerpet Mandal, Hyderabad , Telangana 500078 , India
| | - Dong In Kim
- Department of Chemistry , Chung-Ang University , 84 Heukseok-ro , Dongjak-gu, Seoul 06974 , Republic of Korea
| | - Eun Jin Cho
- Department of Chemistry , Chung-Ang University , 84 Heukseok-ro , Dongjak-gu, Seoul 06974 , Republic of Korea
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39
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Pan J, Li X, Qiu X, Luo X, Jiao N. Copper-Catalyzed Oxygenation Approach to Oxazoles from Amines, Alkynes, and Molecular Oxygen. Org Lett 2018; 20:2762-2765. [PMID: 29664305 DOI: 10.1021/acs.orglett.8b00992] [Citation(s) in RCA: 39] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
A novel and efficient oxygenation approach to trisubstituted oxazoles via a copper-catalyzed aerobic oxidative dehydrogenative annulation of amines, alkynes, and O2 has been developed. This transformation combines dioxygen activation and oxidative C-H bond functionalization and provides a practical protocol for the preparation of oxazole derivatives, which are privileged units found in various bioactive compounds or other natural products. 18O-labeling experiments were conducted to reveal that oxygenation was involved in this chemistry.
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Affiliation(s)
- Jun Pan
- State Key Laboratory of Natural and Biomimetic Drugs, School of Pharmaceutical Sciences , Peking University , Xue Yuan Road 38 , Beijing 100191 , China
| | - Xinyao Li
- State Key Laboratory of Natural and Biomimetic Drugs, School of Pharmaceutical Sciences , Peking University , Xue Yuan Road 38 , Beijing 100191 , China
| | - Xu Qiu
- State Key Laboratory of Natural and Biomimetic Drugs, School of Pharmaceutical Sciences , Peking University , Xue Yuan Road 38 , Beijing 100191 , China
| | - Xiao Luo
- State Key Laboratory of Natural and Biomimetic Drugs, School of Pharmaceutical Sciences , Peking University , Xue Yuan Road 38 , Beijing 100191 , China
| | - Ning Jiao
- State Key Laboratory of Natural and Biomimetic Drugs, School of Pharmaceutical Sciences , Peking University , Xue Yuan Road 38 , Beijing 100191 , China.,Shanghai Key Laboratory of Green Chemistry and Chemical Processes , East China Normal University , Shanghai 200062 , China
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40
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Chen Y, Wang L, Pan X, Wu J, Zhang W, Zhang Z, Zhu X. Establishment of a molecular design to obtain visible-light-activated azoxy polymer actuators. Polym Chem 2018. [DOI: 10.1039/c8py00199e] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
Visible-light-activated main-chain and hyperbranched azoxy polymers were prepared directly from bis-/trinitro-functionalized monomers via photochemical reduction.
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Affiliation(s)
- Yang Chen
- Suzhou Key Laboratory of Macromolecular Design and Precision Synthesis
- Jiangsu
- Key Laboratory of Advanced Functional Polymer Design and Application
- College of Chemistry
- Chemical Engineering and Materials Science
| | - Laibing Wang
- Suzhou Key Laboratory of Macromolecular Design and Precision Synthesis
- Jiangsu
- Key Laboratory of Advanced Functional Polymer Design and Application
- College of Chemistry
- Chemical Engineering and Materials Science
| | - Xiangqiang Pan
- Suzhou Key Laboratory of Macromolecular Design and Precision Synthesis
- Jiangsu
- Key Laboratory of Advanced Functional Polymer Design and Application
- College of Chemistry
- Chemical Engineering and Materials Science
| | - Jin'an Wu
- Suzhou Key Laboratory of Macromolecular Design and Precision Synthesis
- Jiangsu
- Key Laboratory of Advanced Functional Polymer Design and Application
- College of Chemistry
- Chemical Engineering and Materials Science
| | - Wei Zhang
- Suzhou Key Laboratory of Macromolecular Design and Precision Synthesis
- Jiangsu
- Key Laboratory of Advanced Functional Polymer Design and Application
- College of Chemistry
- Chemical Engineering and Materials Science
| | - Zhengbiao Zhang
- Suzhou Key Laboratory of Macromolecular Design and Precision Synthesis
- Jiangsu
- Key Laboratory of Advanced Functional Polymer Design and Application
- College of Chemistry
- Chemical Engineering and Materials Science
| | - Xiulin Zhu
- Suzhou Key Laboratory of Macromolecular Design and Precision Synthesis
- Jiangsu
- Key Laboratory of Advanced Functional Polymer Design and Application
- College of Chemistry
- Chemical Engineering and Materials Science
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41
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Yu X, Chen K, Wang Q, Zhang W, Zhu J. Synthesis of 2,5-disubstituted oxazoles via cobalt(iii)-catalyzed cross-coupling of N-pivaloyloxyamides and alkynes. Chem Commun (Camb) 2018; 54:1197-1200. [DOI: 10.1039/c7cc08611c] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
An efficient synthesis of 2,5-disubstituted oxazoles via cobalt(iii)-catalyzed cross-coupling of N-pivaloyloxyamides and alkynes is described herein.
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Affiliation(s)
- Xiaolong Yu
- Department of Polymer Science and Engineering
- School of Chemistry and Chemical Engineering
- State Key Laboratory of Coordination Chemistry
- Nanjing National Laboratory of Microstructures
- Collaborative Innovation Center of Chemistry for Life Sciences
| | - Kehao Chen
- Department of Polymer Science and Engineering
- School of Chemistry and Chemical Engineering
- State Key Laboratory of Coordination Chemistry
- Nanjing National Laboratory of Microstructures
- Collaborative Innovation Center of Chemistry for Life Sciences
| | - Qi Wang
- Department of Polymer Science and Engineering
- School of Chemistry and Chemical Engineering
- State Key Laboratory of Coordination Chemistry
- Nanjing National Laboratory of Microstructures
- Collaborative Innovation Center of Chemistry for Life Sciences
| | - Wenjing Zhang
- Department of Polymer Science and Engineering
- School of Chemistry and Chemical Engineering
- State Key Laboratory of Coordination Chemistry
- Nanjing National Laboratory of Microstructures
- Collaborative Innovation Center of Chemistry for Life Sciences
| | - Jin Zhu
- Department of Polymer Science and Engineering
- School of Chemistry and Chemical Engineering
- State Key Laboratory of Coordination Chemistry
- Nanjing National Laboratory of Microstructures
- Collaborative Innovation Center of Chemistry for Life Sciences
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42
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Jang HY, Damodar K, Kim JK, Jun JG. Efficient Synthesis and In Vitro
Biological Evaluation of 2,5-Diaryloxazoles as Potential Nitric Oxide Production Inhibitors. B KOREAN CHEM SOC 2017. [DOI: 10.1002/bkcs.11331] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Ha Young Jang
- Department of Chemistry and Institute of Applied Chemistry; Hallym University; Chuncheon 24252 Korea
| | - Kongara Damodar
- Department of Chemistry and Institute of Applied Chemistry; Hallym University; Chuncheon 24252 Korea
| | - Jin-Kyung Kim
- Department of Biomedical Science, College of Natural Science; Catholic University of Daegu; Gyeungsan-Si 38430 South Korea
| | - Jong-Gab Jun
- Department of Chemistry and Institute of Applied Chemistry; Hallym University; Chuncheon 24252 Korea
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43
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Zhang F, Wang J, Zhang X, Meng X, Chen B. A Regioselective Synthesis of 2,5-Diaryl Oxazoles via TsOH/I2
-Mediated Cascade Cyclization. ChemistrySelect 2017. [DOI: 10.1002/slct.201701390] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Fangdong Zhang
- State Key Laboratory of Applied Organic Chemistry; Lanzhou University; Key Laboratory of Nonferrous Metal Chemistry and Resources Utilization of Gansu Province; Lanzhou 730000 P. R. of China
| | - Jing Wang
- State Key Laboratory of Applied Organic Chemistry; Lanzhou University; Key Laboratory of Nonferrous Metal Chemistry and Resources Utilization of Gansu Province; Lanzhou 730000 P. R. of China
| | - Xueguo Zhang
- State Key Laboratory of Applied Organic Chemistry; Lanzhou University; Key Laboratory of Nonferrous Metal Chemistry and Resources Utilization of Gansu Province; Lanzhou 730000 P. R. of China
| | - Xu Meng
- State Key Laboratory for Oxo Synthesis and Selective Oxidation; Suzhou Research Institute of LICP; Lanzhou Institute of Chemical Physics (LICP); Chinese Academy of Sciences; Lanzhou 730000 P. R. of China
| | - Baohua Chen
- State Key Laboratory of Applied Organic Chemistry; Lanzhou University; Key Laboratory of Nonferrous Metal Chemistry and Resources Utilization of Gansu Province; Lanzhou 730000 P. R. of China
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44
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Mallick RK, Prabagar B, Sahoo AK. Regioselective Synthesis of 2,4,5-Trisubstituted Oxazoles and Ketene Aminals via Hydroamidation and Iodo-Imidation of Ynamides. J Org Chem 2017; 82:10583-10594. [DOI: 10.1021/acs.joc.7b02124] [Citation(s) in RCA: 30] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
| | - B. Prabagar
- School of Chemistry, University of Hyderabad, Hyderabad 500046, India
| | - Akhila K. Sahoo
- School of Chemistry, University of Hyderabad, Hyderabad 500046, India
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45
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Yamamoto C, Takamatsu K, Hirano K, Miura M. A Divergent Approach to Indoles and Oxazoles from Enamides by Directing-Group-Controlled Cu-Catalyzed Intramolecular C–H Amination and Alkoxylation. J Org Chem 2017; 82:9112-9118. [DOI: 10.1021/acs.joc.7b01667] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Affiliation(s)
- Chiaki Yamamoto
- Department of Applied Chemistry,
Graduate School of Engineering, Osaka University, Suita, Osaka 565-0871, Japan
| | - Kazutaka Takamatsu
- Department of Applied Chemistry,
Graduate School of Engineering, Osaka University, Suita, Osaka 565-0871, Japan
| | - Koji Hirano
- Department of Applied Chemistry,
Graduate School of Engineering, Osaka University, Suita, Osaka 565-0871, Japan
| | - Masahiro Miura
- Department of Applied Chemistry,
Graduate School of Engineering, Osaka University, Suita, Osaka 565-0871, Japan
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46
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Metal-Free Amine-Mediated Oxidative Synthesis of Polysubstituted Imidazoles from Aryl Methyl Ketones, Ammonium Iodide or Benzylamine, and Hydrogen Peroxide. ASIAN J ORG CHEM 2017. [DOI: 10.1002/ajoc.201700198] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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47
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Mal K, Das I. α-Keto Thioesters as Building Blocks for Accessing γ-Hydroxybutenolides and Oxazoles. Adv Synth Catal 2017. [DOI: 10.1002/adsc.201700329] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Affiliation(s)
- Kanchan Mal
- Organic and Medicinal Chemistry Division; CSIR-Indian Institute of Chemical Biology; 4, Raja S. C. Mullick Road Jadavpur, Kolkata 700032 India
| | - Indrajit Das
- Organic and Medicinal Chemistry Division; CSIR-Indian Institute of Chemical Biology; 4, Raja S. C. Mullick Road Jadavpur, Kolkata 700032 India
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48
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Kamei T, Uryu M, Shimada T. Cu-Catalyzed Aerobic Oxidative C-H/C-O Cyclization of 2,2'-Binaphthols: Practical Synthesis of PXX Derivatives. Org Lett 2017; 19:2714-2717. [PMID: 28481101 DOI: 10.1021/acs.orglett.7b01060] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Cu-catalyzed C-H/C-O cyclization of 2,2'-binaphthol, using air as an oxidant, was developed. C-H functionalization of binaphthols occurred at the 8,8'-position to form peri-xanthenoxanthenes that exhibit high charge-carrier mobility. The reaction can tolerate a wide variety of functional groups and afforded the corresponding peri-xanthenoxanthene derivatives via an efficient procedure.
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Affiliation(s)
- Toshiyuki Kamei
- Department of Chemical Engineering, Nara National College of Technology , 22 Yata-cho, Yamatokoriyama, Nara 639-1080, Japan
| | - Mizuho Uryu
- Department of Chemical Engineering, Nara National College of Technology , 22 Yata-cho, Yamatokoriyama, Nara 639-1080, Japan
| | - Toyoshi Shimada
- Department of Chemical Engineering, Nara National College of Technology , 22 Yata-cho, Yamatokoriyama, Nara 639-1080, Japan
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49
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Yang W, Zhang R, Yi F, Cai M. A Heterogeneous Gold(I)-Catalyzed [2 + 2 + 1] Annulation of Terminal Alkynes, Nitriles, and Oxygen Atoms Leading to 2,5-Disubstituted Oxazoles. J Org Chem 2017; 82:5204-5211. [PMID: 28459566 DOI: 10.1021/acs.joc.7b00386] [Citation(s) in RCA: 54] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The first heterogeneous gold(I)-catalyzed [2 + 2 + 1] annulation of terminal alkynes, nitriles, and oxygen atoms has been achieved by using an MCM-41-immobilized phosphine-gold(I) complex as catalyst and 8-methylquinoline N-oxide as oxidant under mild conditions, yielding a variety of 2,5-disubstituted oxazoles in good to excellent yields with broad substrate scope. The new heterogeneous gold(I) catalyst can easily be recovered by simple filtration of the reaction solution and recycled for at least eight times without significant loss of activity.
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Affiliation(s)
- Weisen Yang
- Key Laboratory of Functional Small Organic Molecule, Ministry of Education and College of Chemistry & Chemical Engineering, Jiangxi Normal University , Nanchang 330022, P. R. China.,College of Ecology and Resources Engineering, Wuyi University , Wuyishan City 354300, P. R. China
| | - Rongli Zhang
- Key Laboratory of Functional Small Organic Molecule, Ministry of Education and College of Chemistry & Chemical Engineering, Jiangxi Normal University , Nanchang 330022, P. R. China
| | - Feiyan Yi
- Key Laboratory of Functional Small Organic Molecule, Ministry of Education and College of Chemistry & Chemical Engineering, Jiangxi Normal University , Nanchang 330022, P. R. China
| | - Mingzhong Cai
- Key Laboratory of Functional Small Organic Molecule, Ministry of Education and College of Chemistry & Chemical Engineering, Jiangxi Normal University , Nanchang 330022, P. R. China
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50
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Chen JR, Yan DM, Wei Q, Xiao WJ. Photocascade Catalysis: A New Strategy for Cascade Reactions. CHEMPHOTOCHEM 2017. [DOI: 10.1002/cptc.201700008] [Citation(s) in RCA: 114] [Impact Index Per Article: 16.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Affiliation(s)
- Jia-Rong Chen
- CCNU-uOttawa Joint Research Centre; Key Laboratory of Pesticide & Chemical Biology; Ministry of Education, College of Chemistry; Central China Normal University; 152 Luoyu Road, Wuhan Hubei 430079 China
| | - Dong-Mei Yan
- CCNU-uOttawa Joint Research Centre; Key Laboratory of Pesticide & Chemical Biology; Ministry of Education, College of Chemistry; Central China Normal University; 152 Luoyu Road, Wuhan Hubei 430079 China
| | - Qiang Wei
- CCNU-uOttawa Joint Research Centre; Key Laboratory of Pesticide & Chemical Biology; Ministry of Education, College of Chemistry; Central China Normal University; 152 Luoyu Road, Wuhan Hubei 430079 China
| | - Wen-Jing Xiao
- CCNU-uOttawa Joint Research Centre; Key Laboratory of Pesticide & Chemical Biology; Ministry of Education, College of Chemistry; Central China Normal University; 152 Luoyu Road, Wuhan Hubei 430079 China
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