1
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Design, synthesis and in vitro antiproliferation activity of some 2-aryl and -heteroaryl benzoxazole derivatives. Future Med Chem 2022; 14:1027-1048. [PMID: 35703122 DOI: 10.4155/fmc-2022-0076] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022] Open
Abstract
Background: Phortress produces reactive electrophilic metabolites that form DNA adducts only in sensitive tumor cells. The authors converted the 2-phenylbenzothiazole nucleus in phortress to 2-aryl and -heteroaryl benzoxazole derivatives (11 new and 14 resynthesized). All synthesized compounds were studied for antitumor activity in various cancer cells. Materials & methods: Cytotoxicity, cell morphology, flow cytometry and cell-cycle analyses of compounds were performed and more active derivatives were tested in the MCF-7 cell line. Conclusion: Methyl 2-(thiophen-2-yl)benzo[d]oxazole-6-carboxylate (BK89) has a higher effect than fluorouracil to induce apoptotic cell death (apoptosis value of 49.44%). Cell-cycle analysis shows that the compounds BK89 and methyl 2-(furan-2-yl)benzo[d]oxazole-6-carboxylate (BK82) can be used as potential cell-cycle blockers by arresting MCF-7 cells in G0/G1 phase at rates of 63% and 85%, respectively.
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2
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Astakhova VV, Moskalik MY, Shainyan BA. Reactions of carboxamides with vinylsilanes under oxidative conditions. J Organomet Chem 2022. [DOI: 10.1016/j.jorganchem.2021.122230] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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3
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Li M, Li M, Tang Y, Sun Y, Qu L, Mao Z. Cu(II)/Vasicine Promoted Intramolecular C-O Formation: Synthesis of Benzoxazoles in EtOH. Curr Org Synth 2020; 18:310-315. [PMID: 33167843 DOI: 10.2174/1570179417666201109151752] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2020] [Revised: 10/12/2020] [Accepted: 10/15/2020] [Indexed: 11/22/2022]
Abstract
AIMS AND OBJECTIVES Benzoxazoles are valuable bicyclic aromatic compounds; the construction of benzoxazoles via C-O cross-coupling reactions has attracted more and more attention. MATERIALS AND METHODS The best condition of C-O bond formation from o-haloanilides was carried out, taking Cu(OTf)2 (5 mol%) and vasicine (10 mol%) as the catalysts in EtOH in the presence of K2CO3 (2 eq.) for 12 h at 90°C. RESULTS A series of 2-substituted benzoxazoles have been prepared in high yields from 2-bromoanilides and 2- iodioanilides under mild conditions. CONCLUSION We have developed an efficient Cu-vasicine catalytic system for intramolecular C-O bond formation. This strategy is applicable to the synthesis of a wide variety of 2-substituted benzoxazoles by intramolecular O-arylation of o-haloanilides.
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Affiliation(s)
- Minxin Li
- College of Pharmaceutical Science, Yunnan University of Chinese Medicine, Kunming 650500, China
| | - Meiling Li
- College of Pharmaceutical Science, Yunnan University of Chinese Medicine, Kunming 650500, China
| | - Yanling Tang
- College of Pharmaceutical Science, Yunnan University of Chinese Medicine, Kunming 650500, China
| | - Yun Sun
- College of Pharmaceutical Science, Yunnan University of Chinese Medicine, Kunming 650500, China
| | - Lu Qu
- College of Pharmaceutical Science, Yunnan University of Chinese Medicine, Kunming 650500, China
| | - Zewei Mao
- College of Pharmaceutical Science, Yunnan University of Chinese Medicine, Kunming 650500, China
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4
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Kundu D, Roy A, Panja S, Singh RK. Microwave-assisted Cobalt-copper Dual Catalyzed Ligand Free C-Se Cross-coupling. CURRENT MICROWAVE CHEMISTRY 2020. [DOI: 10.2174/2213335607666200212101502] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Abstract
Background:
Organoselenides are important building blocks of several biologically important
molecules and natural products. Several protocols have been developed by chemists for their synthesis.
Transition metal-catalyzed cross-coupling is a powerful tool for this purpose in the last two decades. Various
transition metal catalysts e.g. Pd, Ni, Cu, In etc. have been used for performing C-Se cross-coupling
in the presence or absence of ligands.
Objective:
Development of a sustainable protocol for transition metal-catalyzed C-Se cross-coupling is
the main objective of this research. Recently, Cobalt has been applied as a cheap and sustainable transition
metal catalyst in several organic reactions. This protocol is focused on applying cobalt salt as a catalyst
for performing C-Se cross-coupling for the first time.
Methods:
Co(acac)2 has been successfully employed for performing Se-arylations in the presence of CuI,
which acts as a co-catalyst under microwave irradiation. NMP was used as solvent and KOH as a reductant
in this reaction.
Results:
Both iodo-and bromoarenes have been used to perform C-Se cross-coupling with diaryl
diselenide under this Co/Cu dual catalytic system. The reaction was successful with both electrondonating
and withdrawing groups in ortho-, meta-, and para-positions in the aromatic ring of Bromo and
iodoarenes.
Conclusion:
This is an effective protocol for the preparation of organoselenides, catalyzed by cobalt in
the presence of copper. The mechanism has been established by several experimental techniques.
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Affiliation(s)
- Debasish Kundu
- Department of Chemistry, GGDC Mangalkote, Khudrun, Purba Bardhaman-713132, India
| | - Anup Roy
- Department of Chemistry, GGDC Mangalkote, Khudrun, Purba Bardhaman-713132, India
| | - Subir Panja
- Indian Association for the Cultivation of Science, Department of Organic Chemistry, GGDC Mangalkote, Khudrun, Purba Bardhaman-713132, India
| | - Raj K. Singh
- Department of Botany ,GGDC Mangalkote, Khudrun, Purba Bardhaman-713132, India
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5
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Tang Y, Li M, Gao H, Rao G, Mao Z. Efficient Cu-catalyzed intramolecular O-arylation for synthesis of benzoxazoles in water. RSC Adv 2020; 10:14317-14321. [PMID: 35498497 PMCID: PMC9051899 DOI: 10.1039/d0ra00570c] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2020] [Accepted: 03/28/2020] [Indexed: 12/28/2022] Open
Abstract
An efficient method was developed for synthesis of benzoxazoles by Cu-catalyzed intramolecular O-arylation of o-halobenzanilides in water. This strategy provides several advantages, such as high yields, water as a green solvent and functional groups tolerance. An efficient method was developed for synthesis of benzoxazoles by Cu-catalyzed intramolecular O-arylation of o-halobenzanilides in water.![]()
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Affiliation(s)
- Yanling Tang
- College of Pharmaceutical Science, Yunnan University of Chinese Medicine Kunming 650500 P.R. China +86 871 65918232 +86 871 65918232
| | - Minxin Li
- College of Pharmaceutical Science, Yunnan University of Chinese Medicine Kunming 650500 P.R. China +86 871 65918232 +86 871 65918232
| | - Hui Gao
- College of Pharmaceutical Science, Yunnan University of Chinese Medicine Kunming 650500 P.R. China +86 871 65918232 +86 871 65918232
| | - Gaoxiong Rao
- College of Pharmaceutical Science, Yunnan University of Chinese Medicine Kunming 650500 P.R. China +86 871 65918232 +86 871 65918232
| | - Zewei Mao
- College of Pharmaceutical Science, Yunnan University of Chinese Medicine Kunming 650500 P.R. China +86 871 65918232 +86 871 65918232
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6
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Lassagne F, Duguépéroux C, Roca C, Perez C, Martinez A, Baratte B, Robert T, Ruchaud S, Bach S, Erb W, Roisnel T, Mongin F. From simple quinoxalines to potent oxazolo[5,4-f]quinoxaline inhibitors of glycogen-synthase kinase 3 (GSK3). Org Biomol Chem 2019; 18:154-162. [PMID: 31803883 DOI: 10.1039/c9ob02002k] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
2,7-Disubstituted oxazolo[5,4-f]quinoxalines were synthesized from 6-amino-2-chloroquinoxaline in four steps (iodination at C5, substitution of the chloro group, amidation and copper-catalysed cyclization) affording 28 to 44% overall yields. 2,8-Disubstituted oxazolo[5,4-f]quinoxaline was similarly obtained from 6-amino-3-chloroquinoxaline (39% overall yield). For the synthesis of other oxazolo[5,4-f]quinoxalines, amidation was rather performed before substitution; moreover, time-consuming purification steps were avoided between the amines and the final products (38 to 54% overall yields). Finally, a more efficient method involving merging of the last two steps in a sequential process was developed to access more derivatives (37 to 65% overall yields). Most of the oxazolo[5,4-f]quinoxalines were evaluated for their activity on a panel of protein kinases, and a few 2,8-disubstituted derivatives proved to inhibit GSK3 kinase. While experiments showed an ATP-competitive inhibition on GSK3β, structure-activity relationships allowed us to identify 2-(3-pyridyl)-8-(thiomorpholino)oxazolo[5,4-f]quinoxaline as the most potent inhibitor with an IC50 value of about 5 nM on GSK3α.
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Affiliation(s)
- Frédéric Lassagne
- Univ Rennes, CNRS, ISCR (Institut des Sciences Chimiques de Rennes) - UMR 6226, F-35000 Rennes, France.
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7
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8
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Zhang Y, Ji M. Iodine Promoted One-Pot Synthesis of 2-Aryl Benzoxazoles from Amidoximes via Oxidative Cyclization and Ring Contraction. European J Org Chem 2019. [DOI: 10.1002/ejoc.201901468] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Yong Zhang
- School of Biological Science and Medical Engineering; Southeast University; Dingjiaqiao 87 210009 Nanjing China
| | - Min Ji
- School of Biological Science and Medical Engineering; Southeast University; Dingjiaqiao 87 210009 Nanjing China
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9
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Venu Saranya T, Rajan Sruthi P, Anas S. Facile synthesis of 2-benzoxazoles via CuI/2,2'-bipyridine catalyzed intramolecular C-O coupling of 2-haloanilides. SYNTHETIC COMMUN 2019. [DOI: 10.1080/00397911.2018.1554147] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Affiliation(s)
| | | | - Saithalavi Anas
- School of Chemical Sciences, Mahatma Gandhi University, Kottayam, India
- Advanced Molecular Materials Research Centre, Mahatma Gandhi University, Kottayam, India
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10
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Copper-Catalyzed Synthesis, Bio-Evaluation, and in Silico Studies of 2-Aryl-N-alkylbenzimidazoles as Neuroprotective Agents. Catalysts 2018. [DOI: 10.3390/catal8100433] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
2-aryl-N-alkylbenzimidazole derivatives synthesized by CuI/PPh3 promoted direct coupling of N-alkylbenzimidazoles with aryl bromides. In vitro neurotoxicities of 20 compounds were evaluated, and the neuroprotective abilities of low-neurotoxic compounds (3b, 3g, 3h, 3i, 3j, 3k, 3o, 3q, 3s and 3t) were investigated against toxicity induced by 1-methyl-4-phenylpyridinium ion (MPP+) in SH-SY5Y neuronal cells. In silico studies revealed that compound 3g could have molecule docking with the following proteins: the bone morphogenetic protein receptor type 1B (BMPR1B), human cytochrome P450 1B1(CYP1B1), Metabotropic glutamate receptor 7 (GRM7), histone deacetylase 6 (HDAC6), 5-hydroxytryptamine receptor 5A (HTR5A), human topoisomerase II beta (TOP2B). A molecular docking simulation of model compound 3g and model protein CYP1B1 has been shown.
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11
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Pant PL, Shankarling GS. Recent advances in synthetic methodologies for transition metal-free Ullmann condensation reactions. NEW J CHEM 2018. [DOI: 10.1039/c8nj02112k] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
Different methodologies for transition metal-free Ullmann condensation reactions.
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Affiliation(s)
- Preeti Lalit Pant
- Department of Dyestuff Technology
- Institute of Chemical Technology (ICT)
- Mumbai – 400 019
- India
| | - Ganapati S. Shankarling
- Department of Dyestuff Technology
- Institute of Chemical Technology (ICT)
- Mumbai – 400 019
- India
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12
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Shi WM, Li XH, Liang C, Mo DL. Base-Free Selective O
-Arylation and Sequential [3,3]-Rearrangement of Amidoximes with Diaryliodonium Salts: Synthesis of 2-Substituted Benzoxazoles. Adv Synth Catal 2017. [DOI: 10.1002/adsc.201700906] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Affiliation(s)
- Wei-Min Shi
- State Key Laboratory for Chemistry and Molecular Engineering of Medicinal Resources, Ministry of Science and Technology of China; School of Chemistry and Pharmaceutical Sciences; Guangxi Normal University; 15 Yu Cai Road Guilin 541004 People's Republic of China
| | - Xiao-Hua Li
- State Key Laboratory for Chemistry and Molecular Engineering of Medicinal Resources, Ministry of Science and Technology of China; School of Chemistry and Pharmaceutical Sciences; Guangxi Normal University; 15 Yu Cai Road Guilin 541004 People's Republic of China
| | - Cui Liang
- State Key Laboratory for Chemistry and Molecular Engineering of Medicinal Resources, Ministry of Science and Technology of China; School of Chemistry and Pharmaceutical Sciences; Guangxi Normal University; 15 Yu Cai Road Guilin 541004 People's Republic of China
| | - Dong-Liang Mo
- State Key Laboratory for Chemistry and Molecular Engineering of Medicinal Resources, Ministry of Science and Technology of China; School of Chemistry and Pharmaceutical Sciences; Guangxi Normal University; 15 Yu Cai Road Guilin 541004 People's Republic of China
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13
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Jadhav S, Rashinkar G, Salunkhe R, Kumbhar A. Transition metal-free Suzuki type cross-coupling reaction for the synthesis of dissymmetric ketones. Tetrahedron Lett 2017. [DOI: 10.1016/j.tetlet.2017.06.048] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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14
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Vlachou EEN, Armatas GS, Litinas KE. Synthesis of Fused Oxazolocoumarins from o
-Hydroxynitrocoumarins and Benzyl Alcohol Under Gold Nanoparticles or FeCl 3
Catalysis. J Heterocycl Chem 2017. [DOI: 10.1002/jhet.2842] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Affiliation(s)
- Evangelia-Eirini N. Vlachou
- Laboratory of Organic Chemistry, Department of Chemistry; Aristotle University of Thessaloniki; Thessaloniki 54124 Greece
| | - Gerasimos S. Armatas
- Department of Materials Science and Technology; University of Crete; Vassilika Vouton Heraklion 71003 Greece
| | - Konstantinos E. Litinas
- Laboratory of Organic Chemistry, Department of Chemistry; Aristotle University of Thessaloniki; Thessaloniki 54124 Greece
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15
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Copper-catalyzed Direct 2-Arylation of Benzoxazoles and Benzoimidazoles with Aryl Bromides and Cytotoxicity of Products. Sci Rep 2017; 7:43758. [PMID: 28256577 PMCID: PMC5335610 DOI: 10.1038/srep43758] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2016] [Accepted: 01/26/2017] [Indexed: 01/25/2023] Open
Abstract
An efficient copper-catalyzed direct 2-arylation of benzoxazoles and benzoimidazoles with aryl bromides is presented. The CuI/PPh3-based catalyst promotes the installation of various aryl and heteroaryl groups through a C-H activation process in good to excellent yields. The cytotoxicity of obtained 2-aryl benzoxazoles (benzoimidazoles) was also evaluated and 1-methyl-2-(naphthalen-1-yl)benzoimidazole showed potential cytotoxicity.
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16
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Chang W, Sun Y, Huang Y. One-pot green synthesis of benzoxazole derivatives through molecular sieve-catalyzed oxidative cyclization reaction. HETEROATOM CHEMISTRY 2017. [DOI: 10.1002/hc.21360] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Affiliation(s)
- Weichieh Chang
- Department of Applied Chemistry; National University of Kaohsiung; Kaohsiung Taiwan
| | - Yukai Sun
- Department of Chemistry; National Tsing Hua University; Hsinchu Taiwan
| | - Yungtzung Huang
- Department of Applied Chemistry; National University of Kaohsiung; Kaohsiung Taiwan
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17
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Gazzola S, Beccalli EM, Bernasconi A, Borelli T, Broggini G, Mazza A. Palladium-Catalysed Carbo- and Hydroamination of Allenyl Ethers and Aminoallenes: Available Entry to Nitrogen-Containing Benzo-Fused Rings. European J Org Chem 2016. [DOI: 10.1002/ejoc.201600720] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Affiliation(s)
- Silvia Gazzola
- Dipartimento di Scienza e Alta Tecnologia; Università degli Studi dell'Insubria; Via Valleggio 9 22100 Como Italy
| | - Egle M. Beccalli
- DISFARM; Sezione di Chimica Generale e Organica “A. Marchesini”; Università degli Studi di Milano; Via Venezian 21 20133 Milano Italy
| | - Alice Bernasconi
- DISFARM; Sezione di Chimica Generale e Organica “A. Marchesini”; Università degli Studi di Milano; Via Venezian 21 20133 Milano Italy
| | - Tea Borelli
- Dipartimento di Scienza e Alta Tecnologia; Università degli Studi dell'Insubria; Via Valleggio 9 22100 Como Italy
| | - Gianluigi Broggini
- Dipartimento di Scienza e Alta Tecnologia; Università degli Studi dell'Insubria; Via Valleggio 9 22100 Como Italy
| | - Alberto Mazza
- DISFARM; Sezione di Chimica Generale e Organica “A. Marchesini”; Università degli Studi di Milano; Via Venezian 21 20133 Milano Italy
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18
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Efficient synthesis of functionalized chromones via a two-base mediated formal [3+3] cycloaddition. Tetrahedron Lett 2016. [DOI: 10.1016/j.tetlet.2016.04.010] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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19
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Dev D, Chandra J, Palakurthy NB, Thalluri K, Kalita T, Mandal B. Benzoxazole and Benzothiazole Synthesis from Carboxylic Acids in Solution and on Resin by Using Ethyl 2-Cyano-2-(2-nitrobenzenesulfonyloxyimino)acetate and para
-Toluenesulfonic Acid. ASIAN J ORG CHEM 2016. [DOI: 10.1002/ajoc.201500527] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Affiliation(s)
- Dharm Dev
- Department of Chemistry; Indian Institute of Technology Guwahati; North Guwahati- 781039 India
| | - Jyoti Chandra
- Department of Chemistry; Indian Institute of Technology Guwahati; North Guwahati- 781039 India
| | - Nani Babu Palakurthy
- Department of Chemistry; Indian Institute of Technology Guwahati; North Guwahati- 781039 India
| | - Kishore Thalluri
- Department of Chemistry; Indian Institute of Technology Guwahati; North Guwahati- 781039 India
| | - Tapasi Kalita
- Department of Chemistry; Indian Institute of Technology Guwahati; North Guwahati- 781039 India
| | - Bhubaneswar Mandal
- Department of Chemistry; Indian Institute of Technology Guwahati; North Guwahati- 781039 India
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20
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Shen J, Xue L, Lin X, Cheng G, Cui X. The base-promoted synthesis of multisubstituted benzo[b][1,4]oxazepines. Chem Commun (Camb) 2016; 52:3292-5. [DOI: 10.1039/c5cc09877g] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
A variety of substituted benzo[b][1,4]oxazepines have been prepared via base-promoted intramolecular O-arylation from N-(2-haloaryl)enaminones under metal-free conditions.
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Affiliation(s)
- Jinhai Shen
- Key Laboratory of Xiamen Marine and Gene Drugs
- Institutes of Molecular Medicine and School of Biomedical Sciences
- Huaqiao University & Engineering Research Center of Molecular Medicine
- Ministry of Education
- Xiamen 361021
| | - Lulu Xue
- Key Laboratory of Xiamen Marine and Gene Drugs
- Institutes of Molecular Medicine and School of Biomedical Sciences
- Huaqiao University & Engineering Research Center of Molecular Medicine
- Ministry of Education
- Xiamen 361021
| | - Xing Lin
- Key Laboratory of Xiamen Marine and Gene Drugs
- Institutes of Molecular Medicine and School of Biomedical Sciences
- Huaqiao University & Engineering Research Center of Molecular Medicine
- Ministry of Education
- Xiamen 361021
| | - Guolin Cheng
- Key Laboratory of Xiamen Marine and Gene Drugs
- Institutes of Molecular Medicine and School of Biomedical Sciences
- Huaqiao University & Engineering Research Center of Molecular Medicine
- Ministry of Education
- Xiamen 361021
| | - Xiuling Cui
- Key Laboratory of Xiamen Marine and Gene Drugs
- Institutes of Molecular Medicine and School of Biomedical Sciences
- Huaqiao University & Engineering Research Center of Molecular Medicine
- Ministry of Education
- Xiamen 361021
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21
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Hajipour AR, Khorsandi Z. A comparative study of the catalytic activity of Co- and CoFe2O4-NPs in C–N and C–O bond formation: synthesis of benzimidazoles and benzoxazoles from o-haloanilides. NEW J CHEM 2016. [DOI: 10.1039/c6nj02293f] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Herein, new methods and a comparison of the results for dehalogenative intramolecular C–X bond formation using two inexpensive and efficient catalysts are reported.
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Affiliation(s)
- Abdol R. Hajipour
- Department of Chemistry
- Isfahan University of Technology
- Isfahan 84156
- Islamic Republic of Iran
- Department of Neuroscience
| | - Zahra Khorsandi
- Department of Chemistry
- Isfahan University of Technology
- Isfahan 84156
- Islamic Republic of Iran
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22
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Mirjalili BF, Bamoniri A, Bagheri E. KMnO4/HOAc system promoted one-pot synthesis of benzoxazoles from o-aminophenols or oxidative cyclization of o-hydroxyarylidene anilines at room temperature. JOURNAL OF THE IRANIAN CHEMICAL SOCIETY 2015. [DOI: 10.1007/s13738-015-0795-5] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
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23
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Zhu D, Liu P, Lu W, Wang H, Luo B, Hu Y, Huang P, Wen S. Relayed Regioselective Alkynylation/Olefination of Unsymmetrical Cyclic Diaryliodonium Species Catalyzed by Cu and Pd: Affording Fluorescent Cytotoxic Benzoxazoles. Chemistry 2015; 21:18915-20. [PMID: 26516085 DOI: 10.1002/chem.201503791] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2015] [Indexed: 11/10/2022]
Abstract
Although cyclic diaryliodonium species have the potential to act as valuable synthons for cascade transformations, they still remain largely unexplored. The regioselectivity associated with unsymmetrical cyclic diaryliodonium species has previously been known to pose a challenge. A regioselective relayed alkynylation and olefination of unsymmetrical cyclic diaryliodonium species has been achieved by installation of a directing amido group. These relayed transformations were delayed until an oxazole ring had formed, delivering a series of unique fluorescent benzoxazoles. Moreover, some of these synthetic benzoxazoles showed apparent inhibitory activity against malignant cancer cells. Further confocal visualization revealed that benzoxazoles targeted cell nuclei. These findings might provide a novel structural scaffold to develop desirable anticancer agents.
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Affiliation(s)
- Daqian Zhu
- Sun Yat-sen University Cancer Center, State Key Laboratory of Oncology in South China, Collaborative Innovation Center for Cancer Medicine, Sun Yat-sen University 651 Dongfeng East Road, Guangzhou 510060 (China).,School of Pharmaceutical Sciences, Sun Yat-sen University, 132 Waihuan East Road, Guangzhou 510006 (China)
| | - Panpan Liu
- Sun Yat-sen University Cancer Center, State Key Laboratory of Oncology in South China, Collaborative Innovation Center for Cancer Medicine, Sun Yat-sen University 651 Dongfeng East Road, Guangzhou 510060 (China)
| | - Wenhua Lu
- Sun Yat-sen University Cancer Center, State Key Laboratory of Oncology in South China, Collaborative Innovation Center for Cancer Medicine, Sun Yat-sen University 651 Dongfeng East Road, Guangzhou 510060 (China)
| | - Haiwen Wang
- School of Pharmaceutical Sciences, Sun Yat-sen University, 132 Waihuan East Road, Guangzhou 510006 (China)
| | - Bingling Luo
- Sun Yat-sen University Cancer Center, State Key Laboratory of Oncology in South China, Collaborative Innovation Center for Cancer Medicine, Sun Yat-sen University 651 Dongfeng East Road, Guangzhou 510060 (China).,School of Pharmaceutical Sciences, Sun Yat-sen University, 132 Waihuan East Road, Guangzhou 510006 (China)
| | - Yumin Hu
- Sun Yat-sen University Cancer Center, State Key Laboratory of Oncology in South China, Collaborative Innovation Center for Cancer Medicine, Sun Yat-sen University 651 Dongfeng East Road, Guangzhou 510060 (China)
| | - Peng Huang
- Sun Yat-sen University Cancer Center, State Key Laboratory of Oncology in South China, Collaborative Innovation Center for Cancer Medicine, Sun Yat-sen University 651 Dongfeng East Road, Guangzhou 510060 (China).
| | - Shijun Wen
- Sun Yat-sen University Cancer Center, State Key Laboratory of Oncology in South China, Collaborative Innovation Center for Cancer Medicine, Sun Yat-sen University 651 Dongfeng East Road, Guangzhou 510060 (China). .,School of Pharmaceutical Sciences, Sun Yat-sen University, 132 Waihuan East Road, Guangzhou 510006 (China).
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24
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Naganaboina RT, Peddinti RK. Facile one-pot synthesis of (benzoxazol-2ʹ-yl)bicyclo[2.2.2]octen-2-one derivatives. Tetrahedron 2015. [DOI: 10.1016/j.tet.2015.06.073] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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25
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Sharma R, Bala M, Verma PK, Singh B. Water-Mediated Synthesis of Benzazole and Thiourea Motifs by Reacting Naturally Occurring Isothiocyanate with Amines. SYNTHETIC COMMUN 2015. [DOI: 10.1080/00397911.2015.1062514] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Affiliation(s)
- Ritika Sharma
- Natural Product Chemistry and Process Development Division, CSIR Institute of Himalayan Bioresource Technology, Palampur, Himachal Pradesh, India
| | - Manju Bala
- Natural Product Chemistry and Process Development Division, CSIR Institute of Himalayan Bioresource Technology, Palampur, Himachal Pradesh, India
- Academy of Scientific and Innovative Research, New Delhi, India
| | - Praveen Kumar Verma
- Natural Product Chemistry and Process Development Division, CSIR Institute of Himalayan Bioresource Technology, Palampur, Himachal Pradesh, India
- Academy of Scientific and Innovative Research, New Delhi, India
| | - Bikram Singh
- Natural Product Chemistry and Process Development Division, CSIR Institute of Himalayan Bioresource Technology, Palampur, Himachal Pradesh, India
- Academy of Scientific and Innovative Research, New Delhi, India
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26
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Kundu D, Tripathy M, Maity P, Ranu BC. Cobalt-Catalyzed Intermolecular C(sp2)O Cross-Coupling. Chemistry 2015; 21:8727-32. [DOI: 10.1002/chem.201500058] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2015] [Indexed: 11/07/2022]
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27
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Ahmed A, Singha R, Ray JK. Ligand-free copper powder-catalyzed and KOtBu-accelerated expeditious synthesis of substituted benzoxazoles. Tetrahedron Lett 2015. [DOI: 10.1016/j.tetlet.2015.03.067] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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28
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Hajipour AR, Khorsandi Z, Mortazavi M, Farrokhpour H. Green, efficient and large-scale synthesis of benzimidazoles, benzoxazoles and benzothiazoles derivatives using ligand-free cobalt-nanoparticles: as potential anti-estrogen breast cancer agents, and study of their interactions with estrogen receptor by molecular docking. RSC Adv 2015. [DOI: 10.1039/c5ra22207a] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
A facile and high yielding method for the synthesis of 2-aryl benzoxazoles, benzimidazole and benzothiazoles is reported employing cobalt oxide nanoparticles.
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Affiliation(s)
- Abdol R. Hajipour
- Pharmaceutical Research Laboratory
- Department of Chemistry
- Isfahan University of Technology
- Isfahan 84156
- Islamic Republic of Iran
| | - Zahra Khorsandi
- Pharmaceutical Research Laboratory
- Department of Chemistry
- Isfahan University of Technology
- Isfahan 84156
- Islamic Republic of Iran
| | - Maryam Mortazavi
- Department of Chemistry
- Isfahan University of Technology
- Isfahan
- I. R. Iran
- Department of Chemistry
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29
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Affiliation(s)
- Chang-Liang Sun
- Beijing National Laboratory of Molecular Sciences (BNLMS) and Key Laboratory of Bioorganic Chemistry and Molecular Engineering of Ministry of Education, College of Chemistry and Green Chemistry Center, Peking University , 202 Chengfu Road, 098#, Beijing 100871, China
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30
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Chu XQ, Zi Y, Meng H, Xu XP, Ji SJ. Synthesis of 1,4-dihydroquinoline derivatives under transition-metal-free conditions and their diverse applications. Org Biomol Chem 2014; 12:4243-51. [PMID: 24838778 DOI: 10.1039/c4ob00475b] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
A transition-metal-free process for the synthesis of 1,4-dihydroquinoline derivatives starting from simple enaminones with aldehydes via intermolecular cascade cyclization in a one-pot protocol is developed. This methodology affords a variety of products in moderate to good yields. Particularly, the use of the enaminone fragment in 1,4-dihydroquinoline derivatives 3 as a leaving group for further diverse applications with C-nucleophiles is proved to be feasible.
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Affiliation(s)
- Xue-Qiang Chu
- Key Laboratory of Organic Synthesis of Jiangsu Province, College of Chemistry, Chemical Engineering and Materials Science & Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University, Suzhou, 215123, People's Republic of China.
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31
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Yang D, Zhu X, Wei W, Sun N, Yuan L, Jiang M, You J, Wang H. Magnetically recoverable and reusable CuFe2O4 nanoparticle-catalyzed synthesis of benzoxazoles, benzothiazoles and benzimidazoles using dioxygen as oxidant. RSC Adv 2014. [DOI: 10.1039/c4ra00559g] [Citation(s) in RCA: 55] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
A green and efficient strategy for the synthesis of benzoxazoles, benzothiazoles and benzimidazoles has been developed by using inexpensive, readily available, dioxygen-stable and recyclable CuFe2O4 as the nanocatalyst.
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Affiliation(s)
- Daoshan Yang
- Shandong Province Key Laboratory of Life-Organic Analysis
- School of Chemistry and Chemical Engineering
- Qufu Normal University
- Qufu 273165, P. R. China
| | - Xiao Zhu
- Shandong Province Key Laboratory of Life-Organic Analysis
- School of Chemistry and Chemical Engineering
- Qufu Normal University
- Qufu 273165, P. R. China
| | - Wei Wei
- Shandong Province Key Laboratory of Life-Organic Analysis
- School of Chemistry and Chemical Engineering
- Qufu Normal University
- Qufu 273165, P. R. China
| | - Nana Sun
- Shandong Province Key Laboratory of Life-Organic Analysis
- School of Chemistry and Chemical Engineering
- Qufu Normal University
- Qufu 273165, P. R. China
| | - Li Yuan
- Shandong Province Key Laboratory of Life-Organic Analysis
- School of Chemistry and Chemical Engineering
- Qufu Normal University
- Qufu 273165, P. R. China
| | - Min Jiang
- Beijing Key Laboratory for Analytical Methods and Instrumentation
- Department of Chemistry
- Tsinghua University
- Beijing 100084, P. R. China
| | - Jinmao You
- Shandong Province Key Laboratory of Life-Organic Analysis
- School of Chemistry and Chemical Engineering
- Qufu Normal University
- Qufu 273165, P. R. China
- Key Laboratory of Adaptation and Evolution of Plateau Biota
| | - Hua Wang
- Shandong Province Key Laboratory of Life-Organic Analysis
- School of Chemistry and Chemical Engineering
- Qufu Normal University
- Qufu 273165, P. R. China
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32
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Khatun N, Guin S, Rout SK, Patel BK. Divergent reactivities of o-haloanilides with CuO nanoparticles in water: a green synthesis of benzoxazoles and o-hydroxyanilides. RSC Adv 2014. [DOI: 10.1039/c3ra46820h] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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33
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Wu F, Zhang J, Wei Q, Liu P, Xie J, Jiang H, Dai B. Copper-catalysed intramolecular O-arylation: a simple and efficient method for benzoxazole synthesis. Org Biomol Chem 2014; 12:9696-701. [DOI: 10.1039/c4ob02068e] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
An efficient protocol has been developed for the copper-catalysed intramolecular cyclization of N-(2-iodo-/bromo-/chloro-phenyl)benzamides for the synthesis of 2-substituted benzoxazoles.
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Affiliation(s)
- Fengtian Wu
- School of Chemistry and Chemical Engineering/Key Laboratory for Green Processing of Chemical Engineering of Xinjiang Bingtuan
- Shihezi University
- Shihezi 832003, China
| | - Jie Zhang
- School of Chemistry and Chemical Engineering/Key Laboratory for Green Processing of Chemical Engineering of Xinjiang Bingtuan
- Shihezi University
- Shihezi 832003, China
| | - Qianbing Wei
- School of Chemistry and Chemical Engineering/Key Laboratory for Green Processing of Chemical Engineering of Xinjiang Bingtuan
- Shihezi University
- Shihezi 832003, China
| | - Ping Liu
- School of Chemistry and Chemical Engineering/Key Laboratory for Green Processing of Chemical Engineering of Xinjiang Bingtuan
- Shihezi University
- Shihezi 832003, China
| | - Jianwei Xie
- School of Chemistry and Chemical Engineering/Key Laboratory for Green Processing of Chemical Engineering of Xinjiang Bingtuan
- Shihezi University
- Shihezi 832003, China
| | - Haojie Jiang
- School of Chemistry and Chemical Engineering/Key Laboratory for Green Processing of Chemical Engineering of Xinjiang Bingtuan
- Shihezi University
- Shihezi 832003, China
| | - Bin Dai
- School of Chemistry and Chemical Engineering/Key Laboratory for Green Processing of Chemical Engineering of Xinjiang Bingtuan
- Shihezi University
- Shihezi 832003, China
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34
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Wang L, Ren X, Yu J, Jiang Y, Cheng J. Base-Promoted Formal Arylation of Benzo[d]oxazoles with Acyl Chloride. J Org Chem 2013; 78:12076-81. [DOI: 10.1021/jo402106q] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Affiliation(s)
- Lei Wang
- School
of Petrochemical Engineering, Jiangsu Key Laboratory of Advanced Catalytic
Materials and Technology, Jiangsu Province Key Laboratory of Fine
Petrochemical Engineering, Changzhou University, Changzhou 213164, P. R. China
| | - Xinyi Ren
- College
of Chemistry and Materials Engineering, Wenzhou University, Wenzhou 325035, P. R. China
| | - Jintao Yu
- School
of Petrochemical Engineering, Jiangsu Key Laboratory of Advanced Catalytic
Materials and Technology, Jiangsu Province Key Laboratory of Fine
Petrochemical Engineering, Changzhou University, Changzhou 213164, P. R. China
| | - Yan Jiang
- School
of Petrochemical Engineering, Jiangsu Key Laboratory of Advanced Catalytic
Materials and Technology, Jiangsu Province Key Laboratory of Fine
Petrochemical Engineering, Changzhou University, Changzhou 213164, P. R. China
| | - Jiang Cheng
- School
of Petrochemical Engineering, Jiangsu Key Laboratory of Advanced Catalytic
Materials and Technology, Jiangsu Province Key Laboratory of Fine
Petrochemical Engineering, Changzhou University, Changzhou 213164, P. R. China
- College
of Chemistry and Materials Engineering, Wenzhou University, Wenzhou 325035, P. R. China
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35
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Cho YH, Lee CY, Cheon CH. Cyanide as a powerful catalyst for facile synthesis of benzofused heteroaromatic compounds via aerobic oxidation. Tetrahedron 2013. [DOI: 10.1016/j.tet.2013.05.138] [Citation(s) in RCA: 52] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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36
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Wu XF, Neumann H, Neumann S, Beller M. Sequential one-pot synthesis of benzoxazoles from aryl bromides: successive palladium- and copper-catalyzed reactions. Tetrahedron Lett 2013. [DOI: 10.1016/j.tetlet.2013.03.053] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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37
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Jadhav J, Gaikwad V, Kurane R, Salunkhe R, Rashinkar G. Intramolecular O-arylation route to 2-substituted benzoxazoles mediated by ferrocene tethered polymer supported ionic liquid phase catalyst. Tetrahedron 2013. [DOI: 10.1016/j.tet.2013.02.028] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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38
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Peng J, Shang G, Chen C, Miao Z, Li B. Nucleophilic Addition of Benzimidazoles to Alkynyl Bromides/Palladium-Catalyzed Intramolecular C–H Vinylation: Synthesis of Benzo[4,5]imidazo[2,1-a]isoquinolines. J Org Chem 2013; 78:1242-8. [DOI: 10.1021/jo302471z] [Citation(s) in RCA: 49] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Affiliation(s)
- Jinsong Peng
- Department of Chemistry
and Chemical Engineering, College of Science, Northeast Forestry University, Harbin, 150040, P. R.
China
- Post-doctoral
Mobile
Research Station of Forestry Engineering, Northeast Forestry University, Harbin, 150040, P. R.
China
| | - Guoning Shang
- Department of Chemistry
and Chemical Engineering, College of Science, Northeast Forestry University, Harbin, 150040, P. R.
China
| | - Chunxia Chen
- Department of Chemistry
and Chemical Engineering, College of Science, Northeast Forestry University, Harbin, 150040, P. R.
China
| | - Zhongshuo Miao
- Department of Chemistry
and Chemical Engineering, College of Science, Northeast Forestry University, Harbin, 150040, P. R.
China
| | - Bin Li
- Department of Chemistry
and Chemical Engineering, College of Science, Northeast Forestry University, Harbin, 150040, P. R.
China
- Post-doctoral
Mobile
Research Station of Forestry Engineering, Northeast Forestry University, Harbin, 150040, P. R.
China
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39
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Mehta VP, Punji B. Recent advances in transition-metal-free direct C–C and C–heteroatom bond forming reactions. RSC Adv 2013. [DOI: 10.1039/c3ra40813b] [Citation(s) in RCA: 146] [Impact Index Per Article: 12.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
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40
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Cho YH, Lee CY, Ha DC, Cheon CH. Cyanide as a Powerful Catalyst for Facile Preparation of 2-Substituted BenzoxazolesviaAerobic Oxidation. Adv Synth Catal 2012. [DOI: 10.1002/adsc.201200684] [Citation(s) in RCA: 73] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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41
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Chen C, Chen C, Li B, Tao J, Peng J. Aqueous synthesis of 1-H-2-substituted benzimidazoles via transition-metal-free intramolecular amination of aryl iodides. Molecules 2012; 17:12506-20. [PMID: 23095894 PMCID: PMC6268300 DOI: 10.3390/molecules171112506] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2012] [Revised: 10/17/2012] [Accepted: 10/21/2012] [Indexed: 12/01/2022] Open
Abstract
A straightforward method has been developed for the synthesis of the benzimidazole ring system through a carbon-nitrogen cross-coupling reaction. In the presence of 2.0 equiv. of K2CO3 in water at 100 °C for 30 h, the intramolecular cyclization of N-(2-iodoaryl)benzamidine provides benzimidazole derivatives in moderate to high yields. Remarkably, the procedure occurs exclusively in water and doesn’t require the use of any additional reagent/catalyst, rendering the methodology highly valuable from both environmental and economical points of view.
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Affiliation(s)
- Chunxia Chen
- Department of Chemistry and Chemical Engineering, College of Science, Northeast Forestry University, Harbin 150040, China
- Post-Doctoral Mobile Research Station of Forestry Engineering, Northeast Forestry University, Harbin 150040, China
| | - Chen Chen
- Department of Chemistry and Chemical Engineering, College of Science, Northeast Forestry University, Harbin 150040, China
| | - Bin Li
- Department of Chemistry and Chemical Engineering, College of Science, Northeast Forestry University, Harbin 150040, China
- Post-Doctoral Mobile Research Station of Forestry Engineering, Northeast Forestry University, Harbin 150040, China
- Authors to whom correspondence should be addressed; (B.L.); (J.P.); Tel.: +86-451-8219-0679 (B.L.); Fax: +86-451-8219-2699 (B.L.)
| | - Jingwei Tao
- Department of Chemistry and Chemical Engineering, College of Science, Northeast Forestry University, Harbin 150040, China
| | - Jinsong Peng
- Department of Chemistry and Chemical Engineering, College of Science, Northeast Forestry University, Harbin 150040, China
- Authors to whom correspondence should be addressed; (B.L.); (J.P.); Tel.: +86-451-8219-0679 (B.L.); Fax: +86-451-8219-2699 (B.L.)
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42
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Tan H, Pan CX, Xu YL, Wang HS, Pan YM. Synthesis of Benzoxazoles by the Copper Triflate Catalysed Reaction of Nitriles and O-Aminophenols. JOURNAL OF CHEMICAL RESEARCH 2012. [DOI: 10.3184/174751912x13360692916944] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Abstract
An efficient procedure for the synthesis of benzoxazoles by the heteroannulation of nitriles and o-aminophenols in the presence of a catalytic amount of copper(II) trifluoromethanesulfonate, has been developed. This method represents a practical and attractive alternative for the synthesis of both 2-arylbenzoxazoles and 2-alkylbenzoxazoles.
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Affiliation(s)
- Heng Tan
- Key Laboratory for the Chemistry and Molecular Engineering of Medicinal Resources (Ministry of Education of China), School of Chemistry & Chemical Engineering of Guangxi Normal University, Guilin 541004, P. R. China
| | - Cheng-xue Pan
- Key Laboratory for the Chemistry and Molecular Engineering of Medicinal Resources (Ministry of Education of China), School of Chemistry & Chemical Engineering of Guangxi Normal University, Guilin 541004, P. R. China
| | - Yan-li Xu
- Key Laboratory for the Chemistry and Molecular Engineering of Medicinal Resources (Ministry of Education of China), School of Chemistry & Chemical Engineering of Guangxi Normal University, Guilin 541004, P. R. China
| | - Heng-shan Wang
- Key Laboratory for the Chemistry and Molecular Engineering of Medicinal Resources (Ministry of Education of China), School of Chemistry & Chemical Engineering of Guangxi Normal University, Guilin 541004, P. R. China
| | - Ying-ming Pan
- Key Laboratory for the Chemistry and Molecular Engineering of Medicinal Resources (Ministry of Education of China), School of Chemistry & Chemical Engineering of Guangxi Normal University, Guilin 541004, P. R. China
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43
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Catalyst-free synthesis of coumarin-, quinolone- and pyridine-annulated oxazole derivatives. Tetrahedron Lett 2012. [DOI: 10.1016/j.tetlet.2012.01.015] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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44
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Peng J, Chen T, Chen C, Li B. Palladium-Catalyzed Intramolecular C–H Activation/C–C Bond Formation: A Straightforward Synthesis of Phenanthridines. J Org Chem 2011; 76:9507-13. [DOI: 10.1021/jo2017108] [Citation(s) in RCA: 66] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Jinsong Peng
- Department
of Chemistry and
Chemical Engineering, College of Science, Northeast Forestry University, Harbin, 150040, P. R. China
- Post-doctoral Mobile Research
Station of Forestry Engineering, Northeast Forestry University, Harbin, 150040, P. R. China
| | - Tonghui Chen
- Department
of Chemistry and
Chemical Engineering, College of Science, Northeast Forestry University, Harbin, 150040, P. R. China
| | - Chunxia Chen
- Department
of Chemistry and
Chemical Engineering, College of Science, Northeast Forestry University, Harbin, 150040, P. R. China
| | - Bin Li
- Department
of Chemistry and
Chemical Engineering, College of Science, Northeast Forestry University, Harbin, 150040, P. R. China
- Post-doctoral Mobile Research
Station of Forestry Engineering, Northeast Forestry University, Harbin, 150040, P. R. China
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45
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Chen R, Liu S, Liu X, Yang L, Deng GJ. Palladium-catalyzed desulfitative C–H arylation of azoles with sodium sulfinates. Org Biomol Chem 2011; 9:7675-9. [DOI: 10.1039/c1ob06387a] [Citation(s) in RCA: 97] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
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