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Han XW, He Y, Gui C, Chu XQ, Zhao XF, Hu XH, Zhou X, Rao W, Shen ZL. Magnesium-Mediated Cross-Electrophile Couplings of Aryl 2-Pyridyl Esters with Aryl Bromides for Ketone Synthesis through In Situ-Formed Arylmagnesium Intermediates. J Org Chem 2024; 89:13661-13668. [PMID: 39250179 DOI: 10.1021/acs.joc.4c01851] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 09/10/2024]
Abstract
Aryl 2-pyridyl esters could efficiently undergo cross-electrophile couplings with aryl bromides with the aid of magnesium as a reducing metal in the absence of a transition-metal catalyst, leading to the unsymmetrical diaryl ketones in modest to good yields with wide functionality compatibility. In addition, the reaction could be easily scaled up and applied in the late-stage modification of biologically active molecules. Preliminary mechanistic study showed that the coupling reaction presumably proceeds through the in situ formation of arylmagnesium reagents as key intermediates.
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Affiliation(s)
- Xiao-Wei Han
- Technical Institute of Fluorochemistry (TIF), School of Chemistry and Molecular Engineering, Nanjing Tech University, Nanjing 211816, China
| | - Yuan He
- Technical Institute of Fluorochemistry (TIF), School of Chemistry and Molecular Engineering, Nanjing Tech University, Nanjing 211816, China
| | - Chao Gui
- Technical Institute of Fluorochemistry (TIF), School of Chemistry and Molecular Engineering, Nanjing Tech University, Nanjing 211816, China
| | - Xue-Qiang Chu
- Technical Institute of Fluorochemistry (TIF), School of Chemistry and Molecular Engineering, Nanjing Tech University, Nanjing 211816, China
| | - Xue-Fei Zhao
- Technical Institute of Fluorochemistry (TIF), School of Chemistry and Molecular Engineering, Nanjing Tech University, Nanjing 211816, China
| | - Xu-Hong Hu
- Technical Institute of Fluorochemistry (TIF), School of Chemistry and Molecular Engineering, Nanjing Tech University, Nanjing 211816, China
| | - Xiaocong Zhou
- Technical Institute of Fluorochemistry (TIF), School of Chemistry and Molecular Engineering, Nanjing Tech University, Nanjing 211816, China
- College of Biological, Chemical Science and Engineering, Jiaxing University, 118 Jiahang Road, Jiaxing 314001, China
| | - Weidong Rao
- Jiangsu Provincial Key Lab for the Chemistry and Utilization of Agro-Forest Biomass, College of Chemical Engineering, Nanjing Forestry University, Nanjing 210037, China
| | - Zhi-Liang Shen
- Technical Institute of Fluorochemistry (TIF), School of Chemistry and Molecular Engineering, Nanjing Tech University, Nanjing 211816, China
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Ashraf R, Zahoor AF, Ali KG, Nazeer U, Saif MJ, Mansha A, Chaudhry AR, Irfan A. Development of novel transition metal-catalyzed synthetic approaches for the synthesis of a dihydrobenzofuran nucleus: a review. RSC Adv 2024; 14:14539-14581. [PMID: 38708111 PMCID: PMC11066739 DOI: 10.1039/d4ra01830c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2024] [Accepted: 04/16/2024] [Indexed: 05/07/2024] Open
Abstract
The synthesis of dihydrobenzofuran scaffolds bears pivotal significance in the field of medicinal chemistry and organic synthesis. These heterocyclic scaffolds hold immense prospects owing to their significant pharmaceutical applications as they are extensively employed as essential precursors for constructing complex organic frameworks. Their versatility and importance make them an interesting subject of study for researchers in the scientific community. While exploring their synthesis, researchers have unveiled various novel and efficient pathways for assembling the dihydrobenzofuran core. In the wake of extensive data being continuously reported each year, we have outlined the recent updates (post 2020) on novel methodological accomplishments employing the efficient catalytic role of several transition metals to forge dihydrobenzofuran functionalities.
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Affiliation(s)
- Rabia Ashraf
- Department of Chemistry, Government College University Faisalabad 38000-Faisalabad Pakistan
| | - Ameer Fawad Zahoor
- Department of Chemistry, Government College University Faisalabad 38000-Faisalabad Pakistan
| | - Kulsoom Ghulam Ali
- Department of Chemistry, Government College University Faisalabad 38000-Faisalabad Pakistan
| | - Usman Nazeer
- Department of Chemistry, University of Houston 3585 Cullen Boulevard Texas 77204-5003 USA
| | - Muhammad Jawwad Saif
- Department of Applied Chemistry, Government College University Faisalabad 38000-Faisalabad Pakistan
| | - Asim Mansha
- Department of Chemistry, Government College University Faisalabad 38000-Faisalabad Pakistan
| | - Aijaz Rasool Chaudhry
- Department of Physics, College of Science, University of Bisha P. O. Box 551 Bisha 61922 Saudi Arabia
| | - Ahmad Irfan
- Department of Chemistry, College of Science, King Khalid University P. O. Box 9004 Abha 61413 Saudi Arabia
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Sun J, Ye H, Zhang H, Wu XX. Palladium-Catalyzed Cyclization Coupling with Cyclobutanone-Derived N-Tosylhydrazones: Synthesis of Benzofuran-3-Cyclobutylidenes and Spirocyclobutanes. J Org Chem 2023; 88:1568-1577. [PMID: 36648061 DOI: 10.1021/acs.joc.2c02620] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Abstract
A palladium-catalyzed cyclization coupling of iodoarene-tethered alkynes with cyclobutanone-derived N-tosylhydrazones is reported, providing a convenient and efficient approach to benzofuran-3-cyclobutylidenes. On this basis, spirocyclobutanes can be generated smoothly in an efficient cascade manner by the addition of dienophiles. Good yields and scalability are demonstrated. Sequential intramolecular carbopalladation, palladium-carbene migratory insertion, δ-hydride elimination, and cycloaddition processes are involved.
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Affiliation(s)
- Jie Sun
- College of Chemistry and Chemical Engineering, Nantong University, Nantong 226019, P. R. China
| | - Hao Ye
- College of Chemistry and Chemical Engineering, Nantong University, Nantong 226019, P. R. China
| | - Haibin Zhang
- College of Pharmaceutical and Environmental Engineering, Nantong Vocational University, Nantong 226007, P. R. China
| | - Xin-Xing Wu
- College of Chemistry and Chemical Engineering, Nantong University, Nantong 226019, P. R. China
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Chen L, Wang J, Lin C, Zhu Y, Du D. CF 2Br 2 as a Source for Difluoroolefination of 1,3-Enynes via N-Heterocyclic Carbene Catalysis. Org Lett 2022; 24:7047-7051. [PMID: 36121666 DOI: 10.1021/acs.orglett.2c03007] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Commercially available CF2Br2 has been used as a convenient source for the rapid and reliable incorporation of the gem-difluorovinyl motif into an allene framework via an N-heterocyclic carbene catalyzed difluoroolefination of 1,3-enynes. The reaction proceeds through a cascade three-component radical relay/elimination process. This protocol is distinguished by its mild conditions, readily accessible starting materials, wide substrate scope, and ease of late-stage functionalization, thus unlocking an untraditional strategy to construct a new class of functionalized gem-difluorovinyl allenes.
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Affiliation(s)
- Lei Chen
- State Key Laboratory of Natural Medicines, School of Science, China Pharmaceutical University, Nanjing, 210009, P.R. China
| | - Jingyi Wang
- State Key Laboratory of Natural Medicines, School of Science, China Pharmaceutical University, Nanjing, 210009, P.R. China
| | - Chen Lin
- State Key Laboratory of Natural Medicines, School of Science, China Pharmaceutical University, Nanjing, 210009, P.R. China
| | - Yiwei Zhu
- School of Chemistry and Environmental Engineering, Anhui Polytechnic University, Wuhu, Anhui 241000, P.R. China
| | - Ding Du
- State Key Laboratory of Natural Medicines, School of Science, China Pharmaceutical University, Nanjing, 210009, P.R. China
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Xu WY, Li YJ, Gong TJ, Fu Y. Synthesis of gem-Difluorinated 1,3-Dienes via Synergistic Cu/Pd-Catalyzed Borodifluorovinylation of Alkynes. Org Lett 2022; 24:5884-5889. [PMID: 35926100 DOI: 10.1021/acs.orglett.2c01875] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
gem-Difluoroalkenes (=CF2), which normally act as metabolically stable bioisosteres for carbonyl groups (C═O), are widely applied in agrochemicals and pharmaceuticals and are also used as building blocks in organic synthesis. Herein, an example of Cu/Pd-catalyzed borodifluorovinylation was achieved using alkynes, difluoroethylene bromide, and B2pin2 as chemical feedstocks, providing the corresponding conjugated gem-difluoroalkene scaffold with good functional group compatibility. Moreover, an array of fluorinated synthons can be obtained through further transformations.
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Affiliation(s)
- Wen-Yan Xu
- Hefei National Laboratory for Physical Sciences at the Microscale, CAS Key Laboratory of Urban Pollutant Conversion, Anhui Province Key Laboratory of Biomass Clean Energy, University of Science and Technology of China, Hefei, Anhui 230026, People's Republic of China
| | - Yu-Jie Li
- Hefei National Laboratory for Physical Sciences at the Microscale, CAS Key Laboratory of Urban Pollutant Conversion, Anhui Province Key Laboratory of Biomass Clean Energy, University of Science and Technology of China, Hefei, Anhui 230026, People's Republic of China
| | - Tian-Jun Gong
- Hefei National Laboratory for Physical Sciences at the Microscale, CAS Key Laboratory of Urban Pollutant Conversion, Anhui Province Key Laboratory of Biomass Clean Energy, Center for Excellence in Molecular Synthesis of CAS, University of Science and Technology of China, Hefei, Anhui 230026, People's Republic of China
| | - Yao Fu
- Hefei National Laboratory for Physical Sciences at the Microscale, CAS Key Laboratory of Urban Pollutant Conversion, Anhui Province Key Laboratory of Biomass Clean Energy, Center for Excellence in Molecular Synthesis of CAS, University of Science and Technology of China, Hefei, Anhui 230026, People's Republic of China.,Institute of Energy, Hefei Comprehensive National Science Center, Hefei, Anhui 230031, People's Republic of China
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Zhao S, Cai X, Lu Y, Hu J, Xiong Z, Jin J, Li Y, Wang H, Wu JQ. Cp*Ir(III) and Cp*Rh(III)-catalyzed annulation of salicylaldehydes with fluorinated vinyl tosylates. Chem Commun (Camb) 2022; 58:8966-8969. [PMID: 35861224 DOI: 10.1039/d2cc02194c] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A mild, selective and redox-neutral Cp*Ir(III)- and Cp*Rh(III)-catalyzed C-H activation/annulation of salicylaldehydes with fluorovinyl tosylates is reported. The use of monofluorovinyl tosylate favors the synthesis of C2- and C3-substitution-free chromones via C-H activation/β-F elimination/annulation, whereas difluorovinyl tosylate leads to the construction of C2-fluoroalkoxy chromones. Mild reaction conditions and good functional-group tolerance were observed. Further functionalization of the resulting chromones via halogenation, alkynylation, alkylation and hydrocyanation was successfully realized.
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Affiliation(s)
- Shuwen Zhao
- School of Biotechnology and Health Sciences, Wuyi University, 22 Dongchengcun, Jiangmen 529020, China.
| | - Xiaojia Cai
- School of Biotechnology and Health Sciences, Wuyi University, 22 Dongchengcun, Jiangmen 529020, China.
| | - Yuying Lu
- School of Biotechnology and Health Sciences, Wuyi University, 22 Dongchengcun, Jiangmen 529020, China.
| | - Jinhui Hu
- School of Biotechnology and Health Sciences, Wuyi University, 22 Dongchengcun, Jiangmen 529020, China.
| | - Zhuang Xiong
- School of Biotechnology and Health Sciences, Wuyi University, 22 Dongchengcun, Jiangmen 529020, China.
| | - Jingwei Jin
- School of Biotechnology and Health Sciences, Wuyi University, 22 Dongchengcun, Jiangmen 529020, China.
| | - Yin Li
- School of Pharmaceutical Sciences, Sun Yat-sen University, Guangzhou 510006, China.
| | - Honggen Wang
- School of Pharmaceutical Sciences, Sun Yat-sen University, Guangzhou 510006, China.
| | - Jia-Qiang Wu
- School of Biotechnology and Health Sciences, Wuyi University, 22 Dongchengcun, Jiangmen 529020, China.
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