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Duan YR, Wu HL, Gan HF. Synthesis of 2-Arylmethylbenzoxazoles by S8-Mediated Cyclization of 2-Aminophenols with Styrenes. RUSSIAN JOURNAL OF ORGANIC CHEMISTRY 2022. [DOI: 10.1134/s1070428022100177] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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2
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Loro C, Molteni L, Papis M, Beccalli EM, Nava D, Presti LL, Brenna S, Colombo G, Foschi F, Broggini G. Direct Synthesis of Fluorescent Oxazolo-phenoxazines by Copper-Catalyzed/Hypervalent Iodine(III)-Mediated Dimerization/Cyclization of 2-Benzylamino-phenols. J Org Chem 2022; 87:1032-1042. [PMID: 35014843 DOI: 10.1021/acs.joc.1c02329] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
A dimerization/cyclization reaction of 2-benzylamino-phenols for the direct synthesis of the oxazolo-phenoxazine skeleton is reported. The reaction occurs under copper catalysis in the presence of hypervalent iodine(III), giving selectively the 5H-oxazolo[4,5-b]phenoxazine compounds. The cascade process, which allows the conversion of the substrates into the tetracyclic products, involves three C-H functionalization steps. Initial oxidation of electron-rich arenes by the hypervalent iodine is essential for the dimerization of substrates, whereas the formation of the five-membered rings is promoted by the copper species. 1-Benzyl-2-phenyl-6-(aryl-benzyl)amino-benzimidazoles are regioselectively obtained using N,N'-dibenzyl-phenylenediamines as starting substrates. The fluorescence emission properties of these classes of products have been evaluated.
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Affiliation(s)
- Camilla Loro
- Dipartimento di Scienza e Alta Tecnologia, Università dell'Insubria, via Valleggio 11, 22100 Como, Italy
| | - Letizia Molteni
- DISFARM, Sezione di Chimica Generale e Organica "A. Marchesini" Università degli Studi di Milano, via Venezian 21, 20133 Milano, Italy
| | - Marta Papis
- Dipartimento di Scienza e Alta Tecnologia, Università dell'Insubria, via Valleggio 11, 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
| | - Donatella Nava
- DISFARM, Sezione di Chimica Generale e Organica "A. Marchesini" Università degli Studi di Milano, via Venezian 21, 20133 Milano, Italy
| | - Leonardo Lo Presti
- Dipartimento di Chimica, Università degli Studi di Milano, via Golgi 19, 20133 Milano, Italy
| | - Stefano Brenna
- Dipartimento di Scienza e Alta Tecnologia, Università dell'Insubria, via Valleggio 11, 22100 Como, Italy
| | - Gioele Colombo
- Dipartimento di Scienza e Alta Tecnologia, Università dell'Insubria, via Valleggio 11, 22100 Como, Italy
| | - Francesca Foschi
- Dipartimento di Scienza e Alta Tecnologia, Università dell'Insubria, via Valleggio 11, 22100 Como, Italy
| | - Gianluigi Broggini
- Dipartimento di Scienza e Alta Tecnologia, Università dell'Insubria, via Valleggio 11, 22100 Como, Italy
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3
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Gan H, Cao M, Wu H. Synthesis of 2‐Arylbenzoselenazoles from Se‐mediated Redox Condensation of 2‐Chloronitrobenzene and Arylmethyl Chloride. ChemistrySelect 2020. [DOI: 10.1002/slct.202000642] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Haifeng Gan
- College of Biotechnology and Pharmaceutical EngineeringNanjing Tech University Nanjing Jiangsu 211800 P. R. China
| | - Mengru Cao
- College of Biotechnology and Pharmaceutical EngineeringNanjing Tech University Nanjing Jiangsu 211800 P. R. China
| | - Hongli Wu
- College of Biotechnology and Pharmaceutical EngineeringNanjing Tech University Nanjing Jiangsu 211800 P. R. China
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4
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Gan H. Fe/S‐Catalyzed Redox Condensation of
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‐Nitrophenols/thiophenols/anilines with Dibenzyl Disulfide: Access to 2‐Arylbenzazoles. ChemistrySelect 2020. [DOI: 10.1002/slct.201904569] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Affiliation(s)
- Haifeng Gan
- College of Biotechnology and Pharmaceutical Engineering Nanjing Tech University Nanjing Jiangsu 211800 P. R. China
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5
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Li Z, Jin G, Qin J, Tan Z, He J. Efficient and Divergent Synthesis of Benzoxazoles and 1,2-Benzisoxazoles from o-Hydroxyaryl Ketoximes. HETEROCYCLES 2020. [DOI: 10.3987/com-20-14207] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
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6
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Facile preparation of 2-arylbenzoselenazoles from three components reactions: 2-Chloronitrobenzene, Se, and arylacetic acids. Tetrahedron Lett 2020. [DOI: 10.1016/j.tetlet.2019.151393] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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7
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Ge B, Peng Y, Liu J, Wen S, Peng C, Cheng G. Acid-promoted cleavage of the C–C double bond of N-(2-Hydroxylphenyl)enaminones for the synthesis of benzoxazoles. Tetrahedron 2020. [DOI: 10.1016/j.tet.2019.130818] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
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8
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Gan H. S
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‐Mediated Cyclization of 2‐Hydroxy/Amino anilines with Arylacetylene: Approach to Benzoxazoles and Benzimidazoles. ChemistrySelect 2019. [DOI: 10.1002/slct.201902349] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Affiliation(s)
- Haifeng Gan
- College of Biotechnology and Pharmaceutical EngineeringNanjing Tech University, Nanjing, Jiangsu 211800 P. R. China
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