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Kishore DR, Satyanarayana G. Intermolecular Sonogashira Coupling and Intramolecular 5- Exo- dig Cycloisomerization Cascade: A One-Pot Pathway for Accessing (3-Benzylbenzofuran-2-yl)(phenyl)methanones. J Org Chem 2022; 87:10158-10172. [PMID: 35834555 DOI: 10.1021/acs.joc.2c01101] [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
Herein, we present an efficient and straightforward strategy enabling access to 2,3-disubstituted benzo[b]furans. The whole synthetic process proceeds via a domino intermolecular Sonogashira coupling of 2-(2-bromophenoxy)-1-phenylethan-1-ones/alkyl 2-(2-bromophenoxy)acetates/2-(2-bromophenoxy)acetonitrile/1-(2-bromophenoxy)propan-2-one with terminal acetylenes followed by an intramolecular carbanion-yne cyclization in a 5-exo-dig manner and subsequent double-bond isomerization. Notably, two C-C bonds have been constructed in a one-pot manner and a wide variety of (3-benzylbenzofuran-2-yl)(phenyl)methanones were accomplished with good functional group tolerance.
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Affiliation(s)
- Dakoju Ravi Kishore
- Department of Chemistry, Indian Institute of Technology (IIT) Hyderabad, Kandi, Sangareddy District, 502284 Hyderabad, Telangana, India
| | - Gedu Satyanarayana
- Department of Chemistry, Indian Institute of Technology (IIT) Hyderabad, Kandi, Sangareddy District, 502284 Hyderabad, Telangana, India
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2
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Wang L, Xu T, Rao Q, Zhang TS, Hao WJ, Tu SJ, Jiang B. Photocatalytic Biheterocyclization of 1,7-Diynes for Accessing Skeletally Diverse Tricyclic 2-Pyranones. Org Lett 2021; 23:7845-7850. [PMID: 34581592 DOI: 10.1021/acs.orglett.1c02865] [Citation(s) in RCA: 16] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
A new and green route to skeletally diverse oxo-heterocyclic architectures such as pyrano[3,4-c]chromen-2-ones and pyrano[3,4-c]quinolin-2-ones is reported via an unprecedented photocatalytic Kharasch-type cyclization/1,5-(SN″)-substitution/elimination/6π-electrocyclization/double nucleophilic substitution cascade starting from easily available heteroatom-linked 1,7-diynes and low-cost CBrCl3. During this reaction process, the full scission of carbon-halogen bonds of BrCCl3 was realized to directly build two new rings, including a lactone scaffold, using H2O as the oxygen source of the ester group.
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Affiliation(s)
- Lu Wang
- School of Chemistry & Materials Science, Jiangsu Key Laboratory of Green Synthetic Chemistry for Functional Materials, Jiangsu Normal University, Xuzhou 221116, P. R. China
| | - Ting Xu
- School of Chemistry & Materials Science, Jiangsu Key Laboratory of Green Synthetic Chemistry for Functional Materials, Jiangsu Normal University, Xuzhou 221116, P. R. China
| | - Qian Rao
- School of Chemistry & Materials Science, Jiangsu Key Laboratory of Green Synthetic Chemistry for Functional Materials, Jiangsu Normal University, Xuzhou 221116, P. R. China
| | - Tian-Shu Zhang
- School of Materials and Chemical Engineering, Xuzhou University of Technology, Xuzhou 221018, P. R. China
| | - Wen-Juan Hao
- School of Chemistry & Materials Science, Jiangsu Key Laboratory of Green Synthetic Chemistry for Functional Materials, Jiangsu Normal University, Xuzhou 221116, P. R. China
| | - Shu-Jiang Tu
- School of Chemistry & Materials Science, Jiangsu Key Laboratory of Green Synthetic Chemistry for Functional Materials, Jiangsu Normal University, Xuzhou 221116, P. R. China
| | - Bo Jiang
- School of Chemistry & Materials Science, Jiangsu Key Laboratory of Green Synthetic Chemistry for Functional Materials, Jiangsu Normal University, Xuzhou 221116, P. R. China
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3
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Madasu J, Shinde S, Das R, Patel S, Shard A. Potassium tert-butoxide mediated C-C, C-N, C-O and C-S bond forming reactions. Org Biomol Chem 2020; 18:8346-8365. [PMID: 33020791 DOI: 10.1039/d0ob01382j] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
Potassium tertiary butoxide (KOtBu) mediated constructions of C-C, C-O, C-N, and C-S bonds are reviewed with special emphasis on their synthetic applications. KOtBu can be used to perform reactions already known to be carried out using transition metals, but it has advantages in terms of environmental congruence and economic cost. KOtBu is widely employed in organic synthesis to mediate the construction of C-C, C-O, C-N, C-S and miscellaneous bonds in good to excellent yields. Synthetic uses of KOtBu in coupling, alkylation, arylation, α-phenylation, cyclization, Heck-type, annulation, photo-arylation, aromatic-substitution, amidation, and silylation reactions are summarized and discussed. The mechanisms through which KOtBu carries out a specific reaction are also discussed. One of the goals of this review is to attract the attention of chemists as to the benefits of using KOtBu as an environmentally benign alternative to transition metals and its applications in the construction of chemical bonds with predominant importance in organic synthesis. This review completely covers the synthetic protocols that have been performed using KOtBu in the last two decades.
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Affiliation(s)
- Jayashree Madasu
- Department of Medicinal Chemistry, National Institute of Pharmaceutical Education and Research (NIPER), Ahmedabad, Gujarat 380054, India.
| | - Shital Shinde
- Department of Medicinal Chemistry, National Institute of Pharmaceutical Education and Research (NIPER), Ahmedabad, Gujarat 380054, India.
| | - Rudradip Das
- Department of Medicinal Chemistry, National Institute of Pharmaceutical Education and Research (NIPER), Ahmedabad, Gujarat 380054, India.
| | - Sagarkumar Patel
- Department of Medicinal Chemistry, National Institute of Pharmaceutical Education and Research (NIPER), Ahmedabad, Gujarat 380054, India.
| | - Amit Shard
- Department of Medicinal Chemistry, National Institute of Pharmaceutical Education and Research (NIPER), Ahmedabad, Gujarat 380054, India.
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4
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Duc DX. Recent Achievement in the Synthesis of Benzo[b]furans. Curr Org Synth 2020; 17:498-517. [PMID: 32586253 DOI: 10.2174/1570179417666200625212639] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2020] [Revised: 05/21/2020] [Accepted: 05/28/2020] [Indexed: 11/22/2022]
Abstract
BACKGROUND Benzo[b]furan derivatives are oxygen-containing heterocyclic compounds consisting of fused benzene and furan rings and are present in a large number of natural and non-natural compounds. This class of compounds has a wide spectrum of biological activities, such as antiarrhythmic, anticancer, inflammatory, antioxidant, antimicrobial, and antiviral. Furthermore, benzo[b]furan derivatives have also been applied in various areas, such as organic electroluminescence device materials and organic dyes, photosensitizing material, organic synthesis as building blocks or intermediates. Because of a broad range of applicability, the synthesis of benzo[b]furan derivative has drawn great attention of chemists and many studies on the synthesis of this class of compounds have been reported recently. This review will give an overview of benzo[b]furan preparation based on studies dating back to the year 2012. OBJECTIVE In this review, recent development in the synthesis of benzo[b]furans are discussed. There has been increasingly new methodologies for the construction of benzo[b]furans skeleton to improve efficiency or develop environmentally friendly procedures. In some studies, reaction mechanisms were also outlined. CONCLUSION Many methods for the synthesis of benzo[b]furans have been reported recently. Most of them involve cyclization or cycloisomerization processes. Unquestionably, more imaginative strategies for the construction of benzo[b]furan skeleton will be established in the near future. Application of known methods to natural products or drug synthesis, on industrial scale for the synthesis of economically or medicinally important benzo[ b]furans will probably be paid attention to.
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Affiliation(s)
- Dau Xuan Duc
- Department of Chemistry, Vinh University, Vinh City, Vietnam
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5
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Reddy RJ, Kumar JJ, Kumari AH, Krishna GR. Pd‐Catalyzed Annulation of β‐Iodovinyl Sulfones with 2‐Halophenols: A General Route for the Synthesis of 3‐Sulfonyl Benzofuran Derivatives. Adv Synth Catal 2020. [DOI: 10.1002/adsc.201901550] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Affiliation(s)
- Raju Jannapu Reddy
- Department of Chemistry, University College of ScienceOsmania University Hyderabad 500 007 India
| | - Jangam Jagadesh Kumar
- Department of Chemistry, University College of ScienceOsmania University Hyderabad 500 007 India
| | - Arram Haritha Kumari
- Department of Chemistry, University College of ScienceOsmania University Hyderabad 500 007 India
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Harish B, Subbireddy M, Obulesu O, Suresh S. One-Pot Allylation-Intramolecular Vinylogous Michael Addition-Isomerization Cascade of o-Hydroxycinnamates and Congeners: Synthesis of Substituted Benzofuran Derivatives. Org Lett 2019; 21:1823-1827. [PMID: 30835484 DOI: 10.1021/acs.orglett.9b00414] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
A unique intramolecular vinylogous Michael addition leading to the synthesis of heterocycles has been disclosed. Base-promoted one-pot sequential O-allylation of o-hydroxy-cinnamates or -cinnamonitrile or -chalcones with γ-bromocrotonates followed by an intramolecular conjugate addition of vinylogous Michael donors resulted in the formation of highly substituted benzofuran derivatives in good to excellent yields. The intramolecular event followed by two [1,3]-H shifts leading to aromatization appears to be the key to the success of this unprecedented transformation.
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Affiliation(s)
- Battu Harish
- Organic Synthesis and Process Chemistry , CSIR-Indian Institute of Chemical Technology (CSIR-IICT) , Hyderabad 500 007 , India.,Academy of Scientific and Innovative Research (AcSIR) , Ghaziabad 201002 , India
| | - Manyam Subbireddy
- Organic Synthesis and Process Chemistry , CSIR-Indian Institute of Chemical Technology (CSIR-IICT) , Hyderabad 500 007 , India
| | - Owk Obulesu
- Organic Synthesis and Process Chemistry , CSIR-Indian Institute of Chemical Technology (CSIR-IICT) , Hyderabad 500 007 , India.,Academy of Scientific and Innovative Research (AcSIR) , Ghaziabad 201002 , India
| | - Surisetti Suresh
- Organic Synthesis and Process Chemistry , CSIR-Indian Institute of Chemical Technology (CSIR-IICT) , Hyderabad 500 007 , India.,Academy of Scientific and Innovative Research (AcSIR) , Ghaziabad 201002 , India
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7
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Parella R, Babu SA. Pd(II)-Catalyzed Arylation and Intramolecular Amidation of γ-C(sp3)–H Bonds: En Route to Arylheteroarylmethane and Pyrrolidone Ring Annulated Furan/Thiophene Scaffolds. J Org Chem 2017; 82:7123-7150. [DOI: 10.1021/acs.joc.7b00582] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Affiliation(s)
- Ramarao Parella
- Department Chemical Sciences, Indian Institute of Science Education and Research (IISER) Mohali, Knowledge
City, Sector 81, SAS Nagar, Manauli P.O., Mohali, Punjab 140306, India
| | - Srinivasarao Arulananda Babu
- Department Chemical Sciences, Indian Institute of Science Education and Research (IISER) Mohali, Knowledge
City, Sector 81, SAS Nagar, Manauli P.O., Mohali, Punjab 140306, India
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8
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Gai R, Back DF, Zeni G. Potassium tert-Butoxide-Catalyzed Synthesis of Benzofuroazepines via Cyclization of (2-Alkynylbenzyl)oxy Nitriles. J Org Chem 2015; 80:10278-87. [DOI: 10.1021/acs.joc.5b01884] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Affiliation(s)
- Rafaela Gai
- Laboratório
de Síntese, Reatividade, Avaliação
Farmacológica e Toxicológica de Organocalcogênios and ‡Laboratório
de Materiais Inorgânicos, CCNE, UFSM, Santa Maria, Rio Grande
do Sul 97105-900, Brazil
| | - Davi F. Back
- Laboratório
de Síntese, Reatividade, Avaliação
Farmacológica e Toxicológica de Organocalcogênios and ‡Laboratório
de Materiais Inorgânicos, CCNE, UFSM, Santa Maria, Rio Grande
do Sul 97105-900, Brazil
| | - Gilson Zeni
- Laboratório
de Síntese, Reatividade, Avaliação
Farmacológica e Toxicológica de Organocalcogênios and ‡Laboratório
de Materiais Inorgânicos, CCNE, UFSM, Santa Maria, Rio Grande
do Sul 97105-900, Brazil
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9
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Grimaldi TB, Back DF, Zeni G. Synthesis of Naphthofurans bytBuOK-Catalyzed Intramolecular Anionic Cycloaddition of Unsymmetrical Bis-propargyl Ethers. European J Org Chem 2015. [DOI: 10.1002/ejoc.201500969] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
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10
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Velasco R, Feberero C, Sanz R. α-Lithiated Aryl Benzyl Ethers: Inhibition of [1,2]-Wittig Rearrangement and Application to the Synthesis of Benzo[b]furan Derivatives. Org Lett 2015; 17:4416-9. [DOI: 10.1021/acs.orglett.5b01964] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Rocío Velasco
- Área
de Química Orgánica, Departamento de Química,
Facultad de Ciencias, Universidad de Burgos, Pza. Misael Bañuelos s/n, 09001 Burgos, Spain
| | - Claudia Feberero
- Área
de Química Orgánica, Departamento de Química,
Facultad de Ciencias, Universidad de Burgos, Pza. Misael Bañuelos s/n, 09001 Burgos, Spain
| | - Roberto Sanz
- Área
de Química Orgánica, Departamento de Química,
Facultad de Ciencias, Universidad de Burgos, Pza. Misael Bañuelos s/n, 09001 Burgos, Spain
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Cho BS, Chung YK. Palladium-catalyzed bisarylation of 3-alkylbenzofurans to 3-arylalkyl-2-arylbenzofurans on water: tandem C(sp3)–H and C(sp2)–H activation reactions of 3-alkylbenzofurans. Chem Commun (Camb) 2015; 51:14543-6. [DOI: 10.1039/c5cc04052c] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
A protocol involving facile sequential C(sp3)–H and C(sp2)–H activation reactions of 3-alkylbenzofurans catalyzed by Pd(OAc)2 in the presence of pivalic acid, silver salt, and tricyclohexylphosphine ‘on water’ was developed.
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Affiliation(s)
- Beom Shin Cho
- Department of Chemistry
- College of Natural Sciences
- Seoul National University
- Seoul 151-747
- Korea
| | - Young Keun Chung
- Department of Chemistry
- College of Natural Sciences
- Seoul National University
- Seoul 151-747
- Korea
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12
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13
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Li WT, Nan WH, Luo QL. Metal-free sequential reaction via a propargylation, annulation and isomerization sequence for the one-pot synthesis of 2,3-disubstituted benzofurans. RSC Adv 2014. [DOI: 10.1039/c4ra05503a] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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14
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Gai R, Prochnow T, Back DF, Zeni G. Base-mediated intramolecular cyclization of (2-propargyl ether) arylimines: an approach to 3-amino-benzofurans. Tetrahedron 2014. [DOI: 10.1016/j.tet.2014.04.053] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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15
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Thirupathi N, Kumar YK, Kant R, Reddy MS. Selective 5-exo-digCyclization ofin SituSynthesizedN-Boc-2-aminophenyl Ethoxyethynyl Carbenols: Synthesis of Multifunctional Indoles and Their Derivatives. Adv Synth Catal 2014. [DOI: 10.1002/adsc.201301002] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
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16
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Sheng J, Fan C, Wu J. A facile and general route to 3-((trifluoromethyl)thio)benzofurans and 3-((trifluoromethyl)thio)benzothiophenes. Chem Commun (Camb) 2014; 50:5494-6. [DOI: 10.1039/c4cc01904k] [Citation(s) in RCA: 61] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
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17
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Togo H, Miyagi K, Moriyama K. One-Pot Preparation of 2-Arylbenzofurans from Oximes with Diaryliodonium Triflate. HETEROCYCLES 2014. [DOI: 10.3987/com-14-13071] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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