1
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Heredia AA, Argüello JE, Schmidt LC. Metal- and base-free, aerobic photoredox catalysis with riboflavin to synthesize 2-substituted benzothiazoles. Org Biomol Chem 2024; 22:1064-1072. [PMID: 38205732 DOI: 10.1039/d3ob01851b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2024]
Abstract
Sustainable approaches for the synthesis of 2-substituted benzothiazoles are sought after for their use in organic chemistry, bioorganic chemistry, and industrial applications. Here, we described a visible light-driven photoredox catalytic cyclization of thioanilides to afford 2-substituted benzothiazoles using riboflavin as a photocatalyst, where oxygen is used as a clean oxidant and ethanol as a greener solvent. These results provide a new photochemical route for environmentally benign synthesis.
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Affiliation(s)
- Adrián A Heredia
- INFIQC-CONICET-UNC, Departamento de Química Orgánica, Facultad de Ciencias Químicas, Universidad Nacional de Córdoba, Ciudad Universitaria, X5000HUA Córdoba, Argentina.
| | - Juan E Argüello
- INFIQC-CONICET-UNC, Departamento de Química Orgánica, Facultad de Ciencias Químicas, Universidad Nacional de Córdoba, Ciudad Universitaria, X5000HUA Córdoba, Argentina.
| | - Luciana C Schmidt
- INFIQC-CONICET-UNC, Departamento de Química Orgánica, Facultad de Ciencias Químicas, Universidad Nacional de Córdoba, Ciudad Universitaria, X5000HUA Córdoba, Argentina.
- Instituto de Tecnología Química, Universitat Politècnica de València-Consejo Superior de Investigaciones Científicas, Avda. de los Naranjos s/n, E-46022, Valencia, Spain
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2
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Wang M, Ma J, Wang H, Hu F, Sun B, Tan T, Li M, Huang G. Brønsted acid-promoted ring-opening and annulation of thioamides and 2 H-azirines to synthesize 2,4,5-trisubstituted thiazoles. Org Biomol Chem 2023. [PMID: 37376913 DOI: 10.1039/d3ob00245d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/29/2023]
Abstract
In this study, a metal-free synthesis of 2,4,5-trisubstituted thiazoles using 2H-azirines and thioamides is disclosed. Under the catalysis of HClO4, the protocol was realized through a novel chemical bond breaking of 2H-azirine, which is usually achieved using a metal catalyst. It provides an efficient and green route for the synthesis of substituted thiazoles with a broad substrate scope. Preliminary mechanistic studies show that such a reaction may involve a ring-opening reaction, annulation, and a hydrogen atom rearrangement process.
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Affiliation(s)
- Meng Wang
- State Key Laboratory of Applied Organic Chemistry, Key Laboratory of Nonferrous Metal Chemistry and Resources Utilization of Gansu Province, Department of Chemistry, Lanzhou University, Lanzhou 730000, China.
| | - Jingyi Ma
- State Key Laboratory of Applied Organic Chemistry, Key Laboratory of Nonferrous Metal Chemistry and Resources Utilization of Gansu Province, Department of Chemistry, Lanzhou University, Lanzhou 730000, China.
| | - Hesong Wang
- State Key Laboratory of Applied Organic Chemistry, Key Laboratory of Nonferrous Metal Chemistry and Resources Utilization of Gansu Province, Department of Chemistry, Lanzhou University, Lanzhou 730000, China.
| | - Fangpeng Hu
- State Key Laboratory of Applied Organic Chemistry, Key Laboratory of Nonferrous Metal Chemistry and Resources Utilization of Gansu Province, Department of Chemistry, Lanzhou University, Lanzhou 730000, China.
| | - Bo Sun
- State Key Laboratory of Applied Organic Chemistry, Key Laboratory of Nonferrous Metal Chemistry and Resources Utilization of Gansu Province, Department of Chemistry, Lanzhou University, Lanzhou 730000, China.
| | - Taiyan Tan
- State Key Laboratory of Applied Organic Chemistry, Key Laboratory of Nonferrous Metal Chemistry and Resources Utilization of Gansu Province, Department of Chemistry, Lanzhou University, Lanzhou 730000, China.
| | - Minglang Li
- State Key Laboratory of Applied Organic Chemistry, Key Laboratory of Nonferrous Metal Chemistry and Resources Utilization of Gansu Province, Department of Chemistry, Lanzhou University, Lanzhou 730000, China.
| | - Guosheng Huang
- State Key Laboratory of Applied Organic Chemistry, Key Laboratory of Nonferrous Metal Chemistry and Resources Utilization of Gansu Province, Department of Chemistry, Lanzhou University, Lanzhou 730000, China.
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3
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Srinivas B, Shakeena K, Kota DL, Abhinav V, Eswar P, Geetha Sravani R, Sampath Pavan Kumar A, Indukuri K, Dhanaraju KA, Murali Krishna Kumar M, Alla SK. Iron(III)-Catalyzed Regioselective Synthesis of Electron-Rich Benzothiazoles from Aryl Isothiocyanates via C-H Functionalization. J Org Chem 2023; 88:4458-4471. [PMID: 36912001 DOI: 10.1021/acs.joc.2c03078] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/14/2023]
Abstract
We report herein a direct synthetic route for the preparation of 2-arylbenzothiazoles using aryl isothiocyanates and electron-rich arenes. The synthetic route involves triflic acid promoted addition of the arenes to aryl isothiocyanates followed by FeCl3-catalyzed C-S bond formation via C-H functionalization. The approach provides the advantage of synthesis of benzothiazoles without the conventional use of aryl aldehyde/carboxylic acid precursors employing the less expensive iron(III) catalyst.
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Affiliation(s)
- Bokka Srinivas
- Department of Chemistry, GITAM School of Science, GITAM (Deemed to be University), Gandhi Nagar, Rushikonda, Visakhapatnam, Andhra Pradesh 530045, India
| | - Kotari Shakeena
- Department of Chemistry, GITAM School of Science, GITAM (Deemed to be University), Gandhi Nagar, Rushikonda, Visakhapatnam, Andhra Pradesh 530045, India
| | - Durgeswari Lakkavarapu Kota
- Department of Chemistry, GITAM School of Science, GITAM (Deemed to be University), Gandhi Nagar, Rushikonda, Visakhapatnam, Andhra Pradesh 530045, India
| | - Valeti Abhinav
- Department of Chemistry, GITAM School of Science, GITAM (Deemed to be University), Gandhi Nagar, Rushikonda, Visakhapatnam, Andhra Pradesh 530045, India
| | - Pyla Eswar
- Department of Chemistry, GITAM School of Science, GITAM (Deemed to be University), Gandhi Nagar, Rushikonda, Visakhapatnam, Andhra Pradesh 530045, India
| | - Rongali Geetha Sravani
- Department of Chemistry, GITAM School of Science, GITAM (Deemed to be University), Gandhi Nagar, Rushikonda, Visakhapatnam, Andhra Pradesh 530045, India
| | - Anandam Sampath Pavan Kumar
- Department of Chemistry, GITAM School of Science, GITAM (Deemed to be University), Gandhi Nagar, Rushikonda, Visakhapatnam, Andhra Pradesh 530045, India
| | - Kiran Indukuri
- Chemistry-Discovery Research Lab, Dextro Synthesis Private Limited, Hyderabad, Telangana 500090, India
| | | | | | - Santhosh Kumar Alla
- Department of Chemistry, GITAM School of Science, GITAM (Deemed to be University), Gandhi Nagar, Rushikonda, Visakhapatnam, Andhra Pradesh 530045, India
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4
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Karimi B, Mobaraki A, Mirzaei HM, Vali H. Control of selectivity in the preparation of 2-substituted benzoazoles by adjusting the surface hydrophobicity in two solid-based sulfonic acid catalysts. Org Biomol Chem 2023; 21:1692-1703. [PMID: 36734617 DOI: 10.1039/d2ob02274e] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
A series of metal-free tandem reactions for the synthesis of pharmaceutically important 2-substituted benzoazoles from isothiocyanates and 2-aminothiophenol under catalyst-free conditions in the presence of Et-PMO-Me-PrSO3H (1a) and SBA-15-PrSO3H (1b) as solid acids were carried out in a highly selective way under solvent free conditions. A significant selectivity changeover toward either 2-mercaptobenzoxazole or 2-aminobenzoazole derivatives could be achieved by changing the employed catalyst from the relatively hydrophobic material 1a to the more hydrophilic catalyst 1b. This simple experimental procedure with a novel selective approach toward benzoazoles accompanied by green and reusable catalysts could be considered as an alternative to the existing methods for the synthesis of 2-substituted benzoazole derivatives.
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Affiliation(s)
- Babak Karimi
- Department of Chemistry, Institute for Advanced Studies in Basic Sciences (IASBS), Prof. Sobouti Boulevard, Zanjan 45137-6731, Iran. .,Research Center for Basic Sciences & Modern Technologies (RBST), Institute for Advanced Studies in Basic Sciences (IASBS), Prof. Sobouti Boulevard, Zanjan 45137-66731, Iran
| | - Akbar Mobaraki
- Department of Chemistry, Institute for Advanced Studies in Basic Sciences (IASBS), Prof. Sobouti Boulevard, Zanjan 45137-6731, Iran. .,Department of Chemistry, Kharazmi University, South Mofatteh Ave., Tehran 15719-14911, Iran
| | - Hamid M Mirzaei
- Department of Chemistry, Institute for Advanced Studies in Basic Sciences (IASBS), Prof. Sobouti Boulevard, Zanjan 45137-6731, Iran.
| | - Hojatollah Vali
- Anatomy and Cell Biology and Facility for Electron Microscopy Research, McGill University, 3450 University St, Montreal, Quebec, H3A 2A7, Canada
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5
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Broudic N, Pacheco-Benichou A, Fruit C, Besson T. Synthesis of 2-Cyanobenzothiazoles via Pd-Catalyzed/Cu-Assisted C-H Functionalization/Intramolecular C-S Bond Formation from N-Arylcyanothioformamides. MOLECULES (BASEL, SWITZERLAND) 2022; 27:molecules27238426. [PMID: 36500519 PMCID: PMC9738468 DOI: 10.3390/molecules27238426] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/10/2022] [Revised: 11/21/2022] [Accepted: 11/24/2022] [Indexed: 12/04/2022]
Abstract
We report herein on a catalytic system involving palladium and copper to achieve the cyclization of N-arylcyanothioformamides and the synthesis of 2-cyanobenzothiazoles. The C-H functionalization/intramolecular C-S bond formation reaction was achieved in the presence of air, using 2.0 equiv of an inorganic additive (KI). In many cases, the reaction led to a sole product regioselectively obtained in good yields, allowing the synthesis of a wide range of substituted 2-cyanobenzothiazole derivatives, providing valuable building blocks for the design of more complex heterocyclic or molecular labeling systems.
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6
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A Green Approach to 2-Substituted Benzo- and Naphthothiazoles via N-bromosuccinimide/Bromide-Mediated C(aryl)-S Bond Formation. MOLECULES (BASEL, SWITZERLAND) 2022; 27:molecules27227876. [PMID: 36431980 PMCID: PMC9697867 DOI: 10.3390/molecules27227876] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 08/18/2022] [Revised: 11/03/2022] [Accepted: 11/07/2022] [Indexed: 11/17/2022]
Abstract
2-Substituted benzo- and naphthothiazoles have been conveniently prepared from the intramolecular cyclization of phenylthioureas and activated thiobenzanilides or the coupling of isothiocyanates with amines under mild conditions using N-bromosuccinimide/tetrabutylammonium bromide in 1,2-dimethoxyethane (DME) under ambient conditions. The reactions produce moderate to excellent yields with good functional group tolerance and avoid the use of harsh thermal conditions, corrosive reagents, halogenated solvents, toxic metal salts, and expensive metal catalysts, and are amenable to preparations on a gram-scale.
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7
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Ahdenov R, Mohammadi AA, Makarem S, Taheri S, Mollabagher H. Eelectrosynthesis of benzothiazole derivatives via C–H thiolation. HETEROCYCL COMMUN 2022. [DOI: 10.1515/hc-2022-0008] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022] Open
Abstract
Abstract
Benzothiazole derivatives are essential intermediates in synthesizing a wide variety of medical and pharmaceutical compounds, and there is a great demand for a simple and efficient method to synthesize benzothiazoles under mild reaction conditions. Organic electrosynthesis as an energy-efficient process represents an environmentally benign and safer method than traditional methods for organic synthesis. Herein, we present bromine-free and straightforward synthesis of 2-amino benzothiazole derivatives via the reaction of aniline derivatives and ammonium thiocyanate using electrosynthesis in the presence of sodium bromide both as an electrolyte and as a brominating agent at room temperature in isopropyl alcohol (i-PrOH) as a solvent. The reaction of ammonium thiocyanate via C–H thiolation routes, using various aniline derivatives, resulted in a simple, green, and bromine-free synthesis of 2-amino benzothiazole in moderate to good yields under mild reaction conditions. Riluzole drug can be produced using the same procedure in moderate yields.
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Affiliation(s)
- Reza Ahdenov
- Chemistry and Chemical Engineering Research Center of Iran (CCERCI) , 14335-186 , Tehran , Iran
| | - Ali Asghar Mohammadi
- Department of Organic Chemistry, Chemistry and Chemical Engineering Research Center of Iran (CCERCI) , 14335-186 , Tehran , Iran
| | - Somayeh Makarem
- Department of Chemistry, Karaj Branch, Islamic Azad University , Karaj , Iran
| | - Salman Taheri
- Chemistry and Chemical Engineering Research Center of Iran (CCERCI) , 14335-186 , Tehran , Iran
| | - Hoda Mollabagher
- Chemistry and Chemical Engineering Research Center of Iran (CCERCI) , 14335-186 , Tehran , Iran
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8
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Lu Q, Zhao L, Wu L, Wang X, Shen G, Huang X, Du M, Ma D. CuCl
2
or I
2
/DMSO Catalyzed S‐S Bond Cleaving/Cyclization Reactions to Synthesize 2‐Arylbenzothiazoles via 2,2′‐Disulfanediyldianilines and Aromatic Aldehyde. ChemistrySelect 2022. [DOI: 10.1002/slct.202104081] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Qichao Lu
- Chemistry and Chemical Engineering Liaocheng University 1 Hunan Avenue Liaocheng 252000 Shandong P. R. China
| | - Lingyu Zhao
- Chemistry and Chemical Engineering Liaocheng University 1 Hunan Avenue Liaocheng 252000 Shandong P. R. China
- Chemistry and Chemical Engineering Jinan University 106 Jiwei Road Jinan 250022 Shandong P. R. China
| | - Lingang Wu
- Chemistry and Chemical Engineering Liaocheng University 1 Hunan Avenue Liaocheng 252000 Shandong P. R. China
| | - Xiangqian Wang
- Chemistry and Chemical Engineering Liaocheng University 1 Hunan Avenue Liaocheng 252000 Shandong P. R. China
| | - Guodong Shen
- Chemistry and Chemical Engineering Liaocheng University 1 Hunan Avenue Liaocheng 252000 Shandong P. R. China
- Chemistry and Chemical Engineering Jinan University 106 Jiwei Road Jinan 250022 Shandong P. R. China
- National Rubber Additive Engineering Technology Center 399 Qinghe West Road, Yanggu County Liaocheng 252059 Shandong P. R. China
| | - Xianqiang Huang
- Chemistry and Chemical Engineering Liaocheng University 1 Hunan Avenue Liaocheng 252000 Shandong P. R. China
| | - Mengcheng Du
- National Rubber Additive Engineering Technology Center 399 Qinghe West Road, Yanggu County Liaocheng 252059 Shandong P. R. China
| | - Delong Ma
- National Rubber Additive Engineering Technology Center 399 Qinghe West Road, Yanggu County Liaocheng 252059 Shandong P. R. China
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9
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Li J, Liu H, Zhang B, Ge B, Wang D. Synthesis of Supported Indazolyl-Pyridyl-Quinoline Iridium Catalyst and Its Application to N-Alkylation of 2-Aminobenzothiazoles. CHINESE J ORG CHEM 2022. [DOI: 10.6023/cjoc202108026] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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10
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Singh P, Kumar Chouhan K, Mukherjee A. Ruthenium Catalyzed Intramolecular C-X (X=C, N, O, S) Bond Formation via C-H Functionalization: An Overview. Chem Asian J 2021; 16:2392-2412. [PMID: 34251077 DOI: 10.1002/asia.202100513] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2021] [Revised: 07/09/2021] [Indexed: 01/12/2023]
Abstract
Ruthenium catalyzed C-H activation is well known for its high tolerance towards the functional group and broad applicability in organic synthesis and molecular sciences, with significant applications in pharmaceutical industries, material sciences, and polymer industry. In the last few decades, enormous progress has been observed with ruthenium-catalyzed C-H activation chemistry. Notably, the vast majority of the C-H functionalization known in the literature are intermolecular, although the intramolecular variant provides fascinating new structural facet starting from the simple molecular scaffolds. Intramolecular C-H functionalization is atom economical and step efficient, results in less formation of undesired products which is easy to purify. This has created a lot of interest in organic chemistry in developing new synthetic strategies for such functionalization. The focus of this review is to present the relatively unexplored intramolecular functionalization of C-H bonds into C-X (X=C, N, O, S) bonds utilizing versatile ruthenium catalysts, their scope, and brief mechanistic discussion.
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Affiliation(s)
- Pallavi Singh
- Department of Chemistry, Indian Institute of Technology Bhilai GEC Campus, Sejbahar, Raipur, Chhattisgarh, 492015, India
| | - Kishor Kumar Chouhan
- Department of Chemistry, Indian Institute of Technology Bhilai GEC Campus, Sejbahar, Raipur, Chhattisgarh, 492015, India
| | - Arup Mukherjee
- Department of Chemistry, Indian Institute of Technology Bhilai GEC Campus, Sejbahar, Raipur, Chhattisgarh, 492015, India
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11
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Németh AG, Szabó R, Domján A, Keserű GM, Ábrányi‐Balogh P. Chromatography-Free Multicomponent Synthesis of Thioureas Enabled by Aqueous Solution of Elemental Sulfur. ChemistryOpen 2021; 10:16-27. [PMID: 33377316 PMCID: PMC7780808 DOI: 10.1002/open.202000250] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2020] [Revised: 12/14/2020] [Indexed: 12/17/2022] Open
Abstract
The development of a new three-component chromatography-free reaction of isocyanides, amines and elemental sulfur allowed us the straightforward synthesis of thioureas in water. Considering a large pool of organic and inorganic bases, we first optimized the preparation of aqueous polysulfide solution from elemental sulfur. Using polysulfide solution, we were able to omit the otherwise mandatory chromatography, and to isolate the crystalline products directly from the reaction mixture by a simple filtration, retaining the sulfur in the solution phase. A wide range of thioureas synthesized in this way confirmed the reasonable substrate and functional group tolerance of our protocol.
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Affiliation(s)
- András Gy. Németh
- Medicinal Chemistry Research GroupResearch Centre for Natural SciencesMagyar tudósok krt. 21117BudapestHungary
| | - Renáta Szabó
- Medicinal Chemistry Research GroupResearch Centre for Natural SciencesMagyar tudósok krt. 21117BudapestHungary
| | - Attila Domján
- NMR Research LaboratoryResearch Centre for Natural SciencesMagyar tudósok krt. 21117BudapestHungary
| | - György M. Keserű
- Medicinal Chemistry Research GroupResearch Centre for Natural SciencesMagyar tudósok krt. 21117BudapestHungary
| | - Péter Ábrányi‐Balogh
- Medicinal Chemistry Research GroupResearch Centre for Natural SciencesMagyar tudósok krt. 21117BudapestHungary
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12
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Visible-light-induced regioselective cross-dehydrogenative coupling of 2-isothiocyanatonaphthalenes with amines using molecular oxygen. Sci China Chem 2020. [DOI: 10.1007/s11426-020-9811-6] [Citation(s) in RCA: 60] [Impact Index Per Article: 15.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
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13
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Singh M, Vaishali, Paul AK, Singh V. Isatin as a 2-aminobenzaldehyde surrogate: transition metal-free efficient synthesis of 2-(2'-aminophenyl)benzothiazole derivatives. Org Biomol Chem 2020; 18:4459-4469. [PMID: 32490470 DOI: 10.1039/d0ob00888e] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A transition metal-free, convenient, and efficient practical approach has been devised for the synthesis of substituted 2-(2'-aminophenyl)benzothiazoles via a sulfur insertion strategy using isatin derivatives as 2-aminobenzaldehyde surrogates. KI assisted one-pot operation of isatin, arylamines and elemental sulfur resulted in the formation of a C-N and two C-S bonds and cascade cleavage of the isatin ring resulting in the formation of 2-(2'-aminophenyl)benzothiazoles. The significant features of this strategy are the readily available and inexpensive starting materials, broad substrate scope, sustainable reaction conditions and high yield of products. Importantly, the strategy was found to be appropriate for gram scale synthesis (>10 g) of 2-(2'-aminophenyl)benzothiazole derivatives. Moreover, the excellent photophysical properties (ΦF up to 60%) of 2-(2'-aminophenyl)benzothiazole derivatives provide huge scope in materials science.
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Affiliation(s)
- Manpreet Singh
- Department of Chemistry, Dr B R Ambedkar National Institute of Technology (NIT) Jalandhar, 144011, Punjab, India.
| | - Vaishali
- Department of Chemistry, Dr B R Ambedkar National Institute of Technology (NIT) Jalandhar, 144011, Punjab, India.
| | - Avijit Kumar Paul
- Department of Chemistry, National Institute of Technology (NIT) Kurukshetra, 136119, Haryana, India
| | - Virender Singh
- Department of Chemistry, Dr B R Ambedkar National Institute of Technology (NIT) Jalandhar, 144011, Punjab, India. and Department of Chemistry, Central University of Punjab, Bathinda, 151001, Punjab, India. virender.singh.cup.edu.in
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14
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Henry MC, Abbinante VM, Sutherland A. Iron-Catalyzed Regioselective Synthesis of 2-Arylbenzoxazoles and 2-Arylbenzothiazoles via Alternative Reaction Pathways. European J Org Chem 2020. [DOI: 10.1002/ejoc.202000014] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Affiliation(s)
- Martyn C. Henry
- WestCHEM, School of Chemistry; The Joseph Black Building; University of Glasgow; G12 8QQ Glasgow United Kingdom
| | - Vincenzo Mirco Abbinante
- WestCHEM, School of Chemistry; The Joseph Black Building; University of Glasgow; G12 8QQ Glasgow United Kingdom
| | - Andrew Sutherland
- WestCHEM, School of Chemistry; The Joseph Black Building; University of Glasgow; G12 8QQ Glasgow United Kingdom
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15
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Singh M, Dhar S. Yadav L, Krishna Pal Singh R. Visible-light photoredox catalytic approach for the direct synthesis of 2-aminobenzothiazoles from anilines. Tetrahedron Lett 2020. [DOI: 10.1016/j.tetlet.2020.151700] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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16
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Jiang W, Zhuge J, Li J, Histand G, Lin D. Direct Sulfenylation of the Purine C 8-H Bond with Thiophenols. J Org Chem 2020; 85:2415-2425. [PMID: 31898455 DOI: 10.1021/acs.joc.9b03115] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
The one-step copper-mediated regioselective formation of the C8-S bond for purine derivatives with arylthiols was achieved using air as the green oxidant in the presence of 1.0 equiv of Na2CO3 and stoichiometric CuCl and 1,10-phenanthroline monohydrate. This method provides an economical, easy-to-handle, and effective method for the synthesis of 8-sulfenylpurine derivatives in moderate to excellent yields. The reaction is selective for C8 over C2 and C6. It also tolerates a free amine on the purine, and it has a wide substrate scope.
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Affiliation(s)
- Wei Jiang
- Key Laboratory of Functional Molecular Engineering of Guangdong Province, School of Chemistry and Chemical Engineering , South China University of Technology , Guangzhou 510641 , P. R. China
| | - Juanping Zhuge
- Key Laboratory of Functional Molecular Engineering of Guangdong Province, School of Chemistry and Chemical Engineering , South China University of Technology , Guangzhou 510641 , P. R. China
| | - Jianxiao Li
- Key Laboratory of Functional Molecular Engineering of Guangdong Province, School of Chemistry and Chemical Engineering , South China University of Technology , Guangzhou 510641 , P. R. China
| | - Gary Histand
- International School of Advanced Materials , South China University of Technology , Guangzhou 510640 , P. R. China
| | - Dongen Lin
- Key Laboratory of Functional Molecular Engineering of Guangdong Province, School of Chemistry and Chemical Engineering , South China University of Technology , Guangzhou 510641 , P. R. China
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17
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Govaerts S, Nyuchev A, Noel T. Pushing the boundaries of C–H bond functionalization chemistry using flow technology. J Flow Chem 2020. [DOI: 10.1007/s41981-020-00077-7] [Citation(s) in RCA: 56] [Impact Index Per Article: 14.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
AbstractC–H functionalization chemistry is one of the most vibrant research areas within synthetic organic chemistry. While most researchers focus on the development of small-scale batch-type transformations, more recently such transformations have been carried out in flow reactors to explore new chemical space, to boost reactivity or to enable scalability of this important reaction class. Herein, an up-to-date overview of C–H bond functionalization reactions carried out in continuous-flow microreactors is presented. A comprehensive overview of reactions which establish the formal conversion of a C–H bond into carbon–carbon or carbon–heteroatom bonds is provided; this includes metal-assisted C–H bond cleavages, hydrogen atom transfer reactions and C–H bond functionalizations which involve an SE-type process to aromatic or olefinic systems. Particular focus is devoted to showcase the advantages of flow processing to enhance C–H bond functionalization chemistry. Consequently, it is our hope that this review will serve as a guide to inspire researchers to push the boundaries of C–H functionalization chemistry using flow technology.
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18
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Xu H, Zhang X, Zhang X. Thioamidation of Arylpropyne Derivatives with Sulfur and Formamides for the Synthesis of Aryl Propanethioamides. ASIAN J ORG CHEM 2020. [DOI: 10.1002/ajoc.201900680] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Affiliation(s)
- Hong‐Hui Xu
- College of Chemistry and Materials EngineeringWenzhou University Chashan Town Wenzhou 325035 China
| | - Xing‐Guo Zhang
- College of Chemistry and Materials EngineeringWenzhou University Chashan Town Wenzhou 325035 China
- Guangxi Key Laboratory of Calcium Carbonate Resources Comprehensive UtilizationHezhou University Hezhou 542899 China
| | - Xiao‐Hong Zhang
- College of Chemistry and Materials EngineeringWenzhou University Chashan Town Wenzhou 325035 China
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19
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Jiang J, Tuo X, Fu Z, Huang H, Deng GJ. Three-component synthesis of 1,4-benzothiazines via iodide-catalyzed aerobic C–H sulfuration with elemental sulfur. Org Biomol Chem 2020; 18:3234-3238. [DOI: 10.1039/d0ob00074d] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
Five to Six: Beyond the well-established thiazole formation from elemental sulfur, this method provides the first access to the corresponding six-membered N,S-heterocyclic products via direct functionalization of multiple C–H bonds.
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Affiliation(s)
- Jingjing Jiang
- Key Laboratory for Green Organic Synthesis and Application of Hunan Province
- Key Laboratory of Environmentally Friendly Chemistry and Application of Ministry of Education
- College of Chemistry
- Xiangtan University
- Xiangtan 411105
| | - Xiaolong Tuo
- Key Laboratory for Green Organic Synthesis and Application of Hunan Province
- Key Laboratory of Environmentally Friendly Chemistry and Application of Ministry of Education
- College of Chemistry
- Xiangtan University
- Xiangtan 411105
| | - Zhuquan Fu
- Key Laboratory for Green Organic Synthesis and Application of Hunan Province
- Key Laboratory of Environmentally Friendly Chemistry and Application of Ministry of Education
- College of Chemistry
- Xiangtan University
- Xiangtan 411105
| | - Huawen Huang
- Key Laboratory for Green Organic Synthesis and Application of Hunan Province
- Key Laboratory of Environmentally Friendly Chemistry and Application of Ministry of Education
- College of Chemistry
- Xiangtan University
- Xiangtan 411105
| | - Guo-Jun Deng
- Key Laboratory for Green Organic Synthesis and Application of Hunan Province
- Key Laboratory of Environmentally Friendly Chemistry and Application of Ministry of Education
- College of Chemistry
- Xiangtan University
- Xiangtan 411105
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20
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Zhu YQ, Zhang R, Sang W, Wang HJ, Wu Y, Yu BY, Zhang JC, Cheng H, Chen C. Ligand-controlled palladium catalysis enables switch between mono- and di-arylation of primary aromatic amines with 2-halobenzothiazoles. Org Chem Front 2020. [DOI: 10.1039/d0qo00361a] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
Mono- and di-arylation was switchable simply by varying the applied ligand from Xantphos to a pyridine-functionalized N-heterocyclic carbene (NHC) ligand.
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Affiliation(s)
- Yan-Qiu Zhu
- Department of Chemical Engineering and Food Science
- Hubei University of Arts and Science
- Xiangyang 441053
- P. R. China
| | - Rui Zhang
- Department of Chemical Engineering and Food Science
- Hubei University of Arts and Science
- Xiangyang 441053
- P. R. China
| | - Wei Sang
- State Key Laboratory of Advanced Technology for Materials Synthesis and Processing
- Wuhan University of Technology
- Wuhan 430070
- P. R. China
| | - Hua-Jing Wang
- State Key Laboratory of Advanced Technology for Materials Synthesis and Processing
- Wuhan University of Technology
- Wuhan 430070
- P. R. China
| | - Yuan Wu
- Key Laboratory of Pesticide & Chemical Biology
- Ministry of Education
- College of Chemistry
- Central China Normal University
- Wuhan 430079
| | - Bao-Yi Yu
- Key Laboratory of Urban Agriculture (North China)
- Ministry of Agriculture
- Beijing University of Agriculture
- Beijing 102206
- P. R. China
| | - Jun-Chao Zhang
- Department of Chemical Engineering and Food Science
- Hubei University of Arts and Science
- Xiangyang 441053
- P. R. China
| | - Hua Cheng
- Department of Chemical Engineering and Food Science
- Hubei University of Arts and Science
- Xiangyang 441053
- P. R. China
| | - Cheng Chen
- State Key Laboratory of Advanced Technology for Materials Synthesis and Processing
- Wuhan University of Technology
- Wuhan 430070
- P. R. China
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21
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Abstract
Despite the long history of electroorganic synthesis, it did not participate in the mainstream of chemical research for a long time. This is probably due to the lack of equipment and standardized protocols. However, nowadays organic electrochemistry is witnessing a renaissance, and a wide range of interesting electrochemical transformations and methodologies have been developed, not only for academic purposes but also for large scale industrial production. Depending on the source of electricity, electrochemical methods can be inherently green and environmentally benign and can be easily controlled to achieve high levels of selectivity. In addition, the generation and consumption of reactive or unstable intermediates and hazardous reagents can be achieved in a safe way. Limitations of traditional batch-type electrochemical methods such as the restricted electrode surface, the necessity of supporting electrolytes, and the difficulties in scaling up can be alleviated using electrochemical flow cells. Microreactors offer high surface-to-volume ratios and enable precise control over temperature, residence time, flow rate, and pressure. In addition, efficient mixing, enhanced mass and heat transfer, and handling of small volumes lead to simpler scaling-up protocols and minimize safety concerns. Electrolysis under flow conditions reduces the possibility of overoxidation as the reaction mixture is flown continuously out of the reactor in contrast to traditional batch-type electrolysis cells. In this Account, we highlight our contributions in the area of electroorganic synthesis under flow conditions over the past decade. We have designed and manufactured different generations of electrochemical flow cells. The first-generation reactor was effectively used in developing a simple one-step synthesis of diaryliodonium salts and used in proof-of-concept reactions such as the trifluoromethylation of electron-deficient alkenes via Kolbe electrolysis of trifluoroacetic acid in addition to the selective deprotection of the isonicotinyloxycarbonyl (iNoc) group from carbonates and thiocarbonates. The improved second-generation flow cell enabled the development of efficient synthesis of isoindolinones, benzothiazoles, and thiazolopyridines, achieving gram-scale for some of the products easily without changing the reactor design or reoptimizing the reaction parameters. In addition, the same reactor was used in the development of an efficient continuous flow electrochemical synthesis of hypervalent iodine reagents. The generated unstable hypervalent iodine reagents were easily used without isolation in various oxidative transformations in a coupled flow/flow manner and could be easily transformed into bench-stable reagents via quantitative ligand exchange with the appropriate acids. Our second-generation reactor was further improved and commercialized by Vapourtec Ltd. We have demonstrated the power of online analysis in accelerating optimizations and methodology development. Online mass spectrometry enabled fast screening of the charge needed for the cyclization of amides to isoindolinones. The power of online 2D-HPLC combined with a Design of Experiments approach empowered the rapid optimization of stereoselective electrochemical alkoxylations of amino acid derivatives.
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Affiliation(s)
- Mohamed Elsherbini
- School of Chemistry, Cardiff University, Main Building, Park Place, Cardiff CF10 3AT, United Kingdom
| | - Thomas Wirth
- School of Chemistry, Cardiff University, Main Building, Park Place, Cardiff CF10 3AT, United Kingdom
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22
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Huang X, Chen H, Huang Z, Xu Y, Li F, Ma X, Chen Y. Visible Light-Induced Difunctionalization of Alkynes: The Synthesis of Thiazoles and 1,1-Dibromo-1-en-3-ynes. J Org Chem 2019; 84:15283-15293. [DOI: 10.1021/acs.joc.9b02300] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Xiaoying Huang
- Pharmacy School, Guilin Medical University, Guilin 541004, People’s Republic of China
- College of Materials and Chemical Engineering, Hezhou University, Hezhou 542899, China
| | - Hui Chen
- Pharmacy School, Guilin Medical University, Guilin 541004, People’s Republic of China
| | - Zhongzhi Huang
- Pharmacy School, Guilin Medical University, Guilin 541004, People’s Republic of China
| | - Yanli Xu
- Pharmacy School, Guilin Medical University, Guilin 541004, People’s Republic of China
| | - Fangyao Li
- Pharmacy School, Guilin Medical University, Guilin 541004, People’s Republic of China
| | - Xianli Ma
- Pharmacy School, Guilin Medical University, Guilin 541004, People’s Republic of China
| | - Yanyan Chen
- Pharmacy School, Guilin Medical University, Guilin 541004, People’s Republic of China
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23
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Yu W, Wu W, Jiang H. Copper‐Catalyzed Benzylic C—H Functionalization, Oxidation and Cyclization of Methylarenes: Direct Access to 2‐Arylbenzothiazoles. CHINESE J CHEM 2019. [DOI: 10.1002/cjoc.201900340] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Affiliation(s)
- Wentao Yu
- Key Lab of Functional Molecular Engineering of Guangdong Province, School of Chemistry and Chemical EngineeringSouth China University of Technology Guangzhou Guangdong 510640 China
| | - Wanqing Wu
- Key Lab of Functional Molecular Engineering of Guangdong Province, School of Chemistry and Chemical EngineeringSouth China University of Technology Guangzhou Guangdong 510640 China
| | - Huanfeng Jiang
- Key Lab of Functional Molecular Engineering of Guangdong Province, School of Chemistry and Chemical EngineeringSouth China University of Technology Guangzhou Guangdong 510640 China
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24
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Kumar Y, Ila H. Domino Synthesis of 2-Substituted Benzothiazoles by Base-Promoted Intramolecular C–S Bond Formation. Org Lett 2019; 21:7863-7867. [DOI: 10.1021/acs.orglett.9b02855] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Affiliation(s)
- Yogendra Kumar
- New Chemistry Unit, Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur, Bangalore 560064, India
| | - Hiriyakkanavar Ila
- New Chemistry Unit, Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur, Bangalore 560064, India
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25
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Zhang J, Zhao X, Liu P, Sun P. TBHP/KI-Promoted Annulation of Anilines, Ethers, and Elemental Sulfur: Access to 2-Aryl-, 2-Heteroaryl-, or 2-Alkyl-Substituted Benzothiazoles. J Org Chem 2019; 84:12596-12605. [DOI: 10.1021/acs.joc.9b02145] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Affiliation(s)
- Jie Zhang
- School of Chemistry and Materials Science, Jiangsu Provincial Key Laboratory of Material Cycle Processes and Pollution Control, Jiangsu Collaborative Innovation Center of Biomedical Functional Materials, Nanjing Normal University, Nanjing 210023, P. R. China
| | - Xin Zhao
- School of Chemistry and Materials Science, Jiangsu Provincial Key Laboratory of Material Cycle Processes and Pollution Control, Jiangsu Collaborative Innovation Center of Biomedical Functional Materials, Nanjing Normal University, Nanjing 210023, P. R. China
| | - Ping Liu
- School of Chemistry and Materials Science, Jiangsu Provincial Key Laboratory of Material Cycle Processes and Pollution Control, Jiangsu Collaborative Innovation Center of Biomedical Functional Materials, Nanjing Normal University, Nanjing 210023, P. R. China
| | - Peipei Sun
- School of Chemistry and Materials Science, Jiangsu Provincial Key Laboratory of Material Cycle Processes and Pollution Control, Jiangsu Collaborative Innovation Center of Biomedical Functional Materials, Nanjing Normal University, Nanjing 210023, P. R. China
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26
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Xie Z, Chen R, Ma M, Kong L, Liu J, Wang C. Copper‐catalyzed one‐pot coupling reactions of aldehydes (ketones), tosylhydrazide and 2‐amino(benzo)thiazoles: An efficient strategy for the synthesis of
N
‐alkylated (benzo)thiazoles. Appl Organomet Chem 2019. [DOI: 10.1002/aoc.5124] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Affiliation(s)
- Zengyang Xie
- Laboratory of New Antitumor Drug Molecular Design & Synthesis, College of Basic MedicineJining Medical University Jining 272067 China
| | - Ruijiao Chen
- Laboratory of New Antitumor Drug Molecular Design & Synthesis, College of Basic MedicineJining Medical University Jining 272067 China
| | - Mingfang Ma
- Laboratory of New Antitumor Drug Molecular Design & Synthesis, College of Basic MedicineJining Medical University Jining 272067 China
| | - Lingdong Kong
- Laboratory of New Antitumor Drug Molecular Design & Synthesis, College of Basic MedicineJining Medical University Jining 272067 China
| | - Jun Liu
- Laboratory of New Antitumor Drug Molecular Design & Synthesis, College of Basic MedicineJining Medical University Jining 272067 China
| | - Cunde Wang
- School of Chemistry and Chemical EngineeringYangzhou University Yangzhou 225002 China
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27
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Shaik BV, Seelam M, Tamminana R, Kammela PR. Copper promoted C-S and C-N cross-coupling Reactions:The synthesis of 2-(N-Aryolamino)benzothiazoles and 2-(N-Aryolamino)benzimidazoles. Tetrahedron 2019. [DOI: 10.1016/j.tet.2019.05.006] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
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28
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Pinapati SR, Mandapati UR, Tamminana R, Rudraraju RR. A Novel Route to Substituted 2-(N
-Arylamino)benzothiazoles via Iron-Promoted C-S
Bond Formation. ChemistrySelect 2019. [DOI: 10.1002/slct.201803441] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Affiliation(s)
- Srinivasa rao Pinapati
- Department of Chemistry; Acharya Nagarjuna University, Nagarjuna Nagar, Guntur; AP-522510 India
| | - Usha rani Mandapati
- Department of Chemistry; Acharya Nagarjuna University, Nagarjuna Nagar, Guntur; AP-522510 India
| | - Ramana Tamminana
- Department of Chemistry; GITAM Deemed to be University, Bengaluru, Nagadenahalli; Karnataka-562163
| | - Ramesh raju Rudraraju
- Department of Chemistry; Acharya Nagarjuna University, Nagarjuna Nagar, Guntur; AP-522510 India
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29
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Yao G, Wang BF, Yang S, Zhang ZX, Xu HH, Tang RY. DMSO-mediated palladium-catalyzed cyclization of two isothiocyanates via C–H sulfurization: a new route to 2-aminobenzothiazoles. RSC Adv 2019; 9:3403-3406. [PMID: 35518944 PMCID: PMC9060301 DOI: 10.1039/c8ra09784d] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2018] [Accepted: 01/20/2019] [Indexed: 11/21/2022] Open
Abstract
DMSO was found to activate arylisothiocyanates for self-nucleophilic addition. A subsequent intramolecular C–H sulfurization catalyzed by PdBr2 enables access to a wide range of 2-aminobenzothiazole derivatives in moderate to good yields. This is the first example of a DMSO-mediated Pd-catalyzed synthesis of 2-aminobenzothiazoles through cyclization/C–H sulfurization of two isothiocyanates. DMSO-initiated coupling of two isothiocyanates; Pd-catalyzed C–H sulfurization.![]()
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Affiliation(s)
- Guangkai Yao
- Key Laboratory of Natural Pesticide and Chemical Biology
- Ministry of Education
- South China Agricultural University
- Guangzhou 510642
- China
| | - Bing-Feng Wang
- Key Laboratory of Natural Pesticide and Chemical Biology
- Ministry of Education
- South China Agricultural University
- Guangzhou 510642
- China
| | - Shuai Yang
- Key Laboratory of Natural Pesticide and Chemical Biology
- Ministry of Education
- South China Agricultural University
- Guangzhou 510642
- China
| | - Zhi-Xiang Zhang
- Key Laboratory of Natural Pesticide and Chemical Biology
- Ministry of Education
- South China Agricultural University
- Guangzhou 510642
- China
| | - Han-Hong Xu
- Key Laboratory of Natural Pesticide and Chemical Biology
- Ministry of Education
- South China Agricultural University
- Guangzhou 510642
- China
| | - Ri-Yuan Tang
- Key Laboratory of Natural Pesticide and Chemical Biology
- Ministry of Education
- South China Agricultural University
- Guangzhou 510642
- China
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30
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Borpatra PJ, Deka B, Deb ML, Baruah PK. Recent advances in intramolecular C–O/C–N/C–S bond formationviaC–H functionalization. Org Chem Front 2019. [DOI: 10.1039/c9qo00863b] [Citation(s) in RCA: 67] [Impact Index Per Article: 13.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
This review presents the construction of C–X bonds (X = O/N/S) by using intramolecular C–H functionalization for the synthesis of heterocyclic compounds.
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Affiliation(s)
- Paran J. Borpatra
- Department of Applied Sciences
- GUIST
- Gauhati University
- Guwahati-781014
- India
| | - Bhaskar Deka
- Department of Applied Sciences
- GUIST
- Gauhati University
- Guwahati-781014
- India
| | - Mohit L. Deb
- Department of Applied Sciences
- GUIST
- Gauhati University
- Guwahati-781014
- India
| | - Pranjal K. Baruah
- Department of Applied Sciences
- GUIST
- Gauhati University
- Guwahati-781014
- India
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31
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Xu ZM, Li HX, Young DJ, Zhu DL, Li HY, Lang JP. Exogenous Photosensitizer-, Metal-, and Base-Free Visible-Light-Promoted C–H Thiolation via Reverse Hydrogen Atom Transfer. Org Lett 2018; 21:237-241. [DOI: 10.1021/acs.orglett.8b03679] [Citation(s) in RCA: 38] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Ze-Ming Xu
- College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou 215123, Jiangsu, China
| | - Hong-Xi Li
- College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou 215123, Jiangsu, China
- State Key Laboratory of Organometallic Chemistry, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, Shanghai 200032, China
| | - David James Young
- College of Engineering, Information Technology and Environment, Charles Darwin University, Northern Territory 0909, Australia
| | - Da-Liang Zhu
- College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou 215123, Jiangsu, China
| | - Hai-Yan Li
- College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou 215123, Jiangsu, China
| | - Jian-Ping Lang
- College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou 215123, Jiangsu, China
- State Key Laboratory of Organometallic Chemistry, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, Shanghai 200032, China
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32
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Bahadorikhalili S, Sardarian AR. KF-Al2O3 as a Base Heterogeneous Catalyst for the Synthesis of 2-Substituted Benzoxazoles and Benzothiazoles under Mild Reaction Conditions at Room Temperature. Polycycl Aromat Compd 2018. [DOI: 10.1080/10406638.2018.1517808] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Affiliation(s)
| | - Ali Reza Sardarian
- Department of Chemistry, College of Sciences, Shiraz University, Shiraz, Iran
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33
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Liu Y, Yuan X, Guo X, Zhang X, Chen B. Efficient 2-aryl benzothiazole formation from acetophenones, anilines, and elemental sulfur by iodine-catalyzed oxidative C(CO)-C(alkyl) bond cleavage. Tetrahedron 2018. [DOI: 10.1016/j.tet.2018.08.047] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
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34
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Pan J, Li X, Qiu X, Luo X, Jiao N. Copper-Catalyzed Oxygenation Approach to Oxazoles from Amines, Alkynes, and Molecular Oxygen. Org Lett 2018; 20:2762-2765. [PMID: 29664305 DOI: 10.1021/acs.orglett.8b00992] [Citation(s) in RCA: 39] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
A novel and efficient oxygenation approach to trisubstituted oxazoles via a copper-catalyzed aerobic oxidative dehydrogenative annulation of amines, alkynes, and O2 has been developed. This transformation combines dioxygen activation and oxidative C-H bond functionalization and provides a practical protocol for the preparation of oxazole derivatives, which are privileged units found in various bioactive compounds or other natural products. 18O-labeling experiments were conducted to reveal that oxygenation was involved in this chemistry.
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Affiliation(s)
- Jun Pan
- State Key Laboratory of Natural and Biomimetic Drugs, School of Pharmaceutical Sciences , Peking University , Xue Yuan Road 38 , Beijing 100191 , China
| | - Xinyao Li
- State Key Laboratory of Natural and Biomimetic Drugs, School of Pharmaceutical Sciences , Peking University , Xue Yuan Road 38 , Beijing 100191 , China
| | - Xu Qiu
- State Key Laboratory of Natural and Biomimetic Drugs, School of Pharmaceutical Sciences , Peking University , Xue Yuan Road 38 , Beijing 100191 , China
| | - Xiao Luo
- State Key Laboratory of Natural and Biomimetic Drugs, School of Pharmaceutical Sciences , Peking University , Xue Yuan Road 38 , Beijing 100191 , China
| | - Ning Jiao
- State Key Laboratory of Natural and Biomimetic Drugs, School of Pharmaceutical Sciences , Peking University , Xue Yuan Road 38 , Beijing 100191 , China.,Shanghai Key Laboratory of Green Chemistry and Chemical Processes , East China Normal University , Shanghai 200062 , China
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35
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He Y, Li J, Luo S, Huang J, Zhu Q. A metal-free synthesis of 2-aminobenzothiazoles through aminyl radical addition to aryl isothiocyanates. Chem Commun (Camb) 2018; 52:8444-7. [PMID: 27306915 DOI: 10.1039/c6cc04394a] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A convenient synthesis of 2-aminobenzothiazoles, starting from aryl isothiocyanates and formamides under metal-free conditions, is described. Various secondary and tertiary amine- and even α-amino acid-derived formamides can be used as amino sources in this process. Mechanistic studies suggest that the reaction is initiated by decarbonylative aminyl radical formation in the presence of n-Bu4NI and TBHP, followed by aminyl radical addition to isothiocyanates and cyclization via sulfur centred radical intermediates.
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Affiliation(s)
- Yimiao He
- Guangzhou Institutes of Biomedicine and Health, Chinese Academy of Sciences, 190 Kaiyuan Avenue, Guangzhou 510530, China.
| | - Jing Li
- Guangzhou Institutes of Biomedicine and Health, Chinese Academy of Sciences, 190 Kaiyuan Avenue, Guangzhou 510530, China.
| | - Shuang Luo
- Guangzhou Institutes of Biomedicine and Health, Chinese Academy of Sciences, 190 Kaiyuan Avenue, Guangzhou 510530, China.
| | - Jinbo Huang
- Guangzhou Institutes of Biomedicine and Health, Chinese Academy of Sciences, 190 Kaiyuan Avenue, Guangzhou 510530, China.
| | - Qiang Zhu
- Guangzhou Institutes of Biomedicine and Health, Chinese Academy of Sciences, 190 Kaiyuan Avenue, Guangzhou 510530, China.
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36
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Boddapati SNM, Kurmarayuni CM, Mutchu BR, Tamminana R, Bollikolla HB. Copper-catalyzed synthesis of 2-aminophenyl benzothiazoles: a novel approach. Org Biomol Chem 2018; 16:8267-8272. [DOI: 10.1039/c8ob02018c] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
Substituted 2-aminophenyl benzothiazoles have been constructed from thiourea via copper-catalyzed desulfurization/nucleophilic substitution followed by domino intra- and intermolecular C–N cross-coupling reactions under moderate reaction conditions.
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Affiliation(s)
| | | | | | - Ramana Tamminana
- Department of Chemistry
- GITAM Deemed to be University
- India-562163
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37
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Liang S, Shaaban S, Liu NW, Hofman K, Manolikakes G. Recent Advances in the Synthesis of C–S Bonds via Metal-Catalyzed or -Mediated Functionalization of C–H Bonds. ADVANCES IN ORGANOMETALLIC CHEMISTRY 2018. [DOI: 10.1016/bs.adomc.2018.02.001] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
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38
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Natarajan P, Manjeet M, Muskan M, Brar NK, Jot Kaur J. Visible light photoredox catalysis: conversion of a mixture of thiophenols and nitriles into 2-substituted benzothiazoles via consecutive C–S and C–N bond formation reactions. Org Chem Front 2018. [DOI: 10.1039/c8qo00219c] [Citation(s) in RCA: 30] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
A novel, visible-light-mediated method for the synthesis of 2-substituted benzothiazoles from thiophenols and alkyl/aryl nitriles in the presence of eosin Y under air atmosphere is disclosed.
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Affiliation(s)
- Palani Natarajan
- Department of Chemistry & Centre for Advanced Studies in Chemistry
- Panjab University
- Chandigarh - 160014
- India
| | - Manjeet Manjeet
- Department of Chemistry & Centre for Advanced Studies in Chemistry
- Panjab University
- Chandigarh - 160014
- India
| | - Muskan Muskan
- Department of Chemistry & Centre for Advanced Studies in Chemistry
- Panjab University
- Chandigarh - 160014
- India
| | - Navpreet Kaur Brar
- Department of Chemistry & Centre for Advanced Studies in Chemistry
- Panjab University
- Chandigarh - 160014
- India
| | - Jaskamal Jot Kaur
- Department of Chemistry & Centre for Advanced Studies in Chemistry
- Panjab University
- Chandigarh - 160014
- India
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39
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Folgueiras-Amador AA, Qian XY, Xu HC, Wirth T. Catalyst- and Supporting-Electrolyte-Free Electrosynthesis of Benzothiazoles and Thiazolopyridines in Continuous Flow. Chemistry 2017; 24:487-491. [DOI: 10.1002/chem.201705016] [Citation(s) in RCA: 82] [Impact Index Per Article: 11.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/2017] [Indexed: 01/09/2023]
Affiliation(s)
| | - Xiang-Yang Qian
- College of Chemistry and Chemical Engineering; Xiamen University; Xiamen 361005 P. R. China
| | - Hai-Chao Xu
- College of Chemistry and Chemical Engineering; Xiamen University; Xiamen 361005 P. R. China
| | - Thomas Wirth
- School of Chemistry; Cardiff University; Park Place, Main Building Cardiff CF10 3AT UK
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40
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Saraiah B, Gautam V, Acharya A, Pasha MA, Hiriyakkanavar I. One-Pot Synthesis of 2-(Aryl/Alkyl)amino-3-cyanobenzo[b
]thiophenes and Their Hetero-Fused Analogues by Pd-Catalyzed Intramolecular Oxidative C-H Functionalization/Arylthiolation. European J Org Chem 2017. [DOI: 10.1002/ejoc.201700963] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Affiliation(s)
- Bonagiri Saraiah
- Department of Studies in Chemistry; Central College Campus; Bangalore University; Palace Road 560001 Bangalore India
| | - Vibha Gautam
- New Chemistry Unit; Central College Campus; Jawaharlal Nehru Centre for Advanced Scientific Research; Jakkur 560064 Bangalore India
| | - Anand Acharya
- New Chemistry Unit; Central College Campus; Jawaharlal Nehru Centre for Advanced Scientific Research; Jakkur 560064 Bangalore India
| | - Mohamed A. Pasha
- Department of Studies in Chemistry; Central College Campus; Bangalore University; Palace Road 560001 Bangalore India
| | - Ila Hiriyakkanavar
- New Chemistry Unit; Central College Campus; Jawaharlal Nehru Centre for Advanced Scientific Research; Jakkur 560064 Bangalore India
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41
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Xu Y, Li B, Zhang X, Fan X. Metal-Free Synthesis of 2-Aminobenzothiazoles via Iodine-Catalyzed and Oxygen-Promoted Cascade Reactions of Isothiocyanatobenzenes with Amines. J Org Chem 2017; 82:9637-9646. [PMID: 28812346 DOI: 10.1021/acs.joc.7b01683] [Citation(s) in RCA: 30] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
In this paper, a highly efficient and sustainable synthesis of 2-aminobenzothiazoles through the cascade reactions of isothiocyanatobenzenes with primary or secondary amines by using iodine as a catalyst and oxygen as an oxidant is presented. Mechanistically, the formation of the title compounds involves the in situ formation of the required benzothiourea intermediate followed by its intramolecular cross dehydrogenative coupling of a C(sp2)-H bond and a S-H bond. To our knowledge, this should be the first example in which 2-aminobenzothiazoles are efficiently prepared from simple and cheap isothiocyanates and amines under metal-free conditions by using iodine as a catalyst and molecular oxygen as an oxidant with water as the byproduct. Compared with literature protocols, this method eliminates the use of ortho-halo-substituted precursors, expensive transition-metal catalysts, and hazardous oxidants.
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Affiliation(s)
- Yuanshuang Xu
- School of Chemistry and Chemical Engineering, Collaborative Innovation Center of Henan Province for Green Manufacturing of Fine Chemicals, Henan Key Laboratory of Organic Functional Molecule and Drug Innovation, Key Laboratory of Green Chemical Media and Reactions, Ministry of Education, Henan Normal University , Xinxiang, Henan 453007, China
| | - Bin Li
- School of Chemistry and Chemical Engineering, Collaborative Innovation Center of Henan Province for Green Manufacturing of Fine Chemicals, Henan Key Laboratory of Organic Functional Molecule and Drug Innovation, Key Laboratory of Green Chemical Media and Reactions, Ministry of Education, Henan Normal University , Xinxiang, Henan 453007, China
| | - Xinying Zhang
- School of Chemistry and Chemical Engineering, Collaborative Innovation Center of Henan Province for Green Manufacturing of Fine Chemicals, Henan Key Laboratory of Organic Functional Molecule and Drug Innovation, Key Laboratory of Green Chemical Media and Reactions, Ministry of Education, Henan Normal University , Xinxiang, Henan 453007, China
| | - Xuesen Fan
- School of Chemistry and Chemical Engineering, Collaborative Innovation Center of Henan Province for Green Manufacturing of Fine Chemicals, Henan Key Laboratory of Organic Functional Molecule and Drug Innovation, Key Laboratory of Green Chemical Media and Reactions, Ministry of Education, Henan Normal University , Xinxiang, Henan 453007, China
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42
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Che X, Jiang J, Xiao F, Huang H, Deng GJ. Assembly of 2-Arylbenzothiazoles through Three-Component Oxidative Annulation under Transition-Metal-Free Conditions. Org Lett 2017; 19:4576-4579. [DOI: 10.1021/acs.orglett.7b02168] [Citation(s) in RCA: 79] [Impact Index Per Article: 11.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Xingzong Che
- Key
Laboratory of Environmentally Friendly Chemistry and Application of
Ministry of Education, College of Chemistry, Xiangtan University, Xiangtan 411105, China
| | - Jingjing Jiang
- Key
Laboratory of Environmentally Friendly Chemistry and Application of
Ministry of Education, College of Chemistry, Xiangtan University, Xiangtan 411105, China
| | - Fuhong Xiao
- Key
Laboratory of Environmentally Friendly Chemistry and Application of
Ministry of Education, College of Chemistry, Xiangtan University, Xiangtan 411105, China
| | - Huawen Huang
- Key
Laboratory of Environmentally Friendly Chemistry and Application of
Ministry of Education, College of Chemistry, Xiangtan University, Xiangtan 411105, China
| | - Guo-Jun Deng
- Key
Laboratory of Environmentally Friendly Chemistry and Application of
Ministry of Education, College of Chemistry, Xiangtan University, Xiangtan 411105, China
- Beijing
National Laboratory for Molecular Sciences and CAS Key Laboratory
of Molecular Recognition and Function Institute of Chemistry, Chinese Academy of Sciences (CAS), Beijing 100190, China
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43
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Wróbel Z, Plichta K, Kwast A. Reactivity and substituent effects in the cyclization of N -aryl-2-nitrosoanilines to phenazines. Tetrahedron 2017. [DOI: 10.1016/j.tet.2017.04.046] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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44
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Qian XY, Li SQ, Song J, Xu HC. TEMPO-Catalyzed Electrochemical C–H Thiolation: Synthesis of Benzothiazoles and Thiazolopyridines from Thioamides. ACS Catal 2017. [DOI: 10.1021/acscatal.7b00426] [Citation(s) in RCA: 153] [Impact Index Per Article: 21.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Xiang-Yang Qian
- iChEM,
State Key Laboratory of Physical Chemistry of Solid Surfaces, and
College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, P. R. China
| | - Shu-Qi Li
- iChEM,
State Key Laboratory of Physical Chemistry of Solid Surfaces, and
College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, P. R. China
| | - Jinshuai Song
- Fujian
Institute of Research on Structure of Matter, Chinese Academy of Sciences, Fuzhou 350002, P. R. China
| | - Hai-Chao Xu
- iChEM,
State Key Laboratory of Physical Chemistry of Solid Surfaces, and
College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, P. R. China
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45
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Wang WJ, Liu XJ, Wang XC. Silver-Mediated C−S Cross-Coupling of Di(pyrimidin-2-yl) Disulfides with Aliphatic Carboxylic Acids. ChemistrySelect 2017. [DOI: 10.1002/slct.201601870] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Wen-Juan Wang
- Key Laboratory of Polymer Materials; College of Chemistry and Chemical Engineering; Northwest Normal University; Gansu, Lanzhou 730070 P. R. China
- Gan Su Medical College; Gansu, Pingliang 744000 P. R. China
| | - Xiao-Jun Liu
- Key Laboratory of Polymer Materials; College of Chemistry and Chemical Engineering; Northwest Normal University; Gansu, Lanzhou 730070 P. R. China
| | - Xi-Cun Wang
- Key Laboratory of Polymer Materials; College of Chemistry and Chemical Engineering; Northwest Normal University; Gansu, Lanzhou 730070 P. R. China
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46
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Li G, Jiang J, Zhang F, Xiao F, Deng GJ. Elemental sulfur mediated 2-substituted benzothiazole formation from 2-aminobenzenethiols and arylacetylenes or styrenes under metal-free conditions. Org Biomol Chem 2017; 15:10024-10028. [DOI: 10.1039/c7ob02430d] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
2-Substituted-benzothiazole derivatives were selectively prepared from 2-aminothiophenols and arylacetylenes or styrenes using elemental sulfur as the efficient oxidant.
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Affiliation(s)
- Guozheng Li
- Key Laboratory for Green Organic Synthesis and Application of Hunan Province
- Key Laboratory of Environmentally Friendly Chemistry and Application of Ministry of Education
- College of Chemistry
- Xiangtan University
- Xiangtan 411105
| | - Jingjing Jiang
- Key Laboratory for Green Organic Synthesis and Application of Hunan Province
- Key Laboratory of Environmentally Friendly Chemistry and Application of Ministry of Education
- College of Chemistry
- Xiangtan University
- Xiangtan 411105
| | - Feng Zhang
- Key Laboratory for Green Organic Synthesis and Application of Hunan Province
- Key Laboratory of Environmentally Friendly Chemistry and Application of Ministry of Education
- College of Chemistry
- Xiangtan University
- Xiangtan 411105
| | - Fuhong Xiao
- Key Laboratory for Green Organic Synthesis and Application of Hunan Province
- Key Laboratory of Environmentally Friendly Chemistry and Application of Ministry of Education
- College of Chemistry
- Xiangtan University
- Xiangtan 411105
| | - Guo-Jun Deng
- Key Laboratory for Green Organic Synthesis and Application of Hunan Province
- Key Laboratory of Environmentally Friendly Chemistry and Application of Ministry of Education
- College of Chemistry
- Xiangtan University
- Xiangtan 411105
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47
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Yang P, Wang R, Wu H, Du Z, Fu Y. Pd-Catalyzed C−H Arylation of Benzothiazoles with Diaryliodonium Salt: One-Pot Synthesis of 2-Arylbenzothiazoles. ASIAN J ORG CHEM 2016. [DOI: 10.1002/ajoc.201600514] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Peng Yang
- Key Laboratory of Eco-Environment Related Polymer Materials of Ministry of Education; College of Chemistry and Chemical Engineering; Northwest Normal University; Lanzhou 730070 P. R. China
| | - Rui Wang
- Key Laboratory of Eco-Environment Related Polymer Materials of Ministry of Education; College of Chemistry and Chemical Engineering; Northwest Normal University; Lanzhou 730070 P. R. China
| | - Hui Wu
- Key Laboratory of Eco-Environment Related Polymer Materials of Ministry of Education; College of Chemistry and Chemical Engineering; Northwest Normal University; Lanzhou 730070 P. R. China
| | - Zhengyin Du
- Key Laboratory of Eco-Environment Related Polymer Materials of Ministry of Education; College of Chemistry and Chemical Engineering; Northwest Normal University; Lanzhou 730070 P. R. China
| | - Ying Fu
- Key Laboratory of Eco-Environment Related Polymer Materials of Ministry of Education; College of Chemistry and Chemical Engineering; Northwest Normal University; Lanzhou 730070 P. R. China
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48
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Wu DZ, Zhi YG. An efficient method for the construction of 2-Aminothiazolo[5,4-c]pyridines via K3[Fe(CN)6] oxidized SP2 CH Functionalization. Tetrahedron 2016. [DOI: 10.1016/j.tet.2016.11.032] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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49
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Hédou D, Dubouilh-Benard C, Loaëc N, Meijer L, Fruit C, Besson T. Synthesis of Bioactive 2-(Arylamino)thiazolo[5,4-f]-quinazolin-9-ones via the Hügershoff Reaction or Cu- Catalyzed Intramolecular C-S Bond Formation. Molecules 2016; 21:molecules21060794. [PMID: 27322235 PMCID: PMC6272913 DOI: 10.3390/molecules21060794] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2016] [Revised: 06/12/2016] [Accepted: 06/13/2016] [Indexed: 11/16/2022] Open
Abstract
A library of thirty eight novel thiazolo[5,4-f]quinazolin-9(8H)-one derivatives (series 8, 10, 14 and 17) was prepared via the Hügershoff reaction and a Cu catalyzed intramolecular C-S bond formation, helped by microwave-assisted technology when required. The efficient multistep synthesis of the key 6-amino-3-cyclopropylquinazolin-4(3H)-one (3) has been reinvestigated and performed on a multigram scale from the starting 5-nitroanthranilic acid. The inhibitory potency of the final products was evaluated against five kinases involved in Alzheimer's disease and showed that some molecules of the 17 series described in this paper are particularly promising for the development of novel multi-target inhibitors of kinases.
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Affiliation(s)
- Damien Hédou
- Normandie Univ, UNIROUEN, INSA Rouen, CNRS, COBRA, 76000 Rouen, France.
| | | | - Nadège Loaëc
- Protein Phosphorylation & Human Disease group, Station Biologique, 29680 Roscoff, France.
- Manros Therapeutics, Centre de Perharidy, 29680 Roscoff, France.
| | - Laurent Meijer
- Manros Therapeutics, Centre de Perharidy, 29680 Roscoff, France.
| | - Corinne Fruit
- Normandie Univ, UNIROUEN, INSA Rouen, CNRS, COBRA, 76000 Rouen, France.
| | - Thierry Besson
- Normandie Univ, UNIROUEN, INSA Rouen, CNRS, COBRA, 76000 Rouen, France.
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50
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Sharma S, Pathare RS, Maurya AK, Gopal K, Roy TK, Sawant DM, Pardasani RT. Ruthenium Catalyzed Intramolecular C-S Coupling Reactions: Synthetic Scope and Mechanistic Insight. Org Lett 2016; 18:356-9. [PMID: 26761401 DOI: 10.1021/acs.orglett.5b03185] [Citation(s) in RCA: 55] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A ruthenium catalyzed intramolecular C-S coupling reaction of N-arylthioureas for the synthesis of 2-aminobenzothiazoles has been developed. Kinetic, isotope labeling, and computational studies reveal the involvement of an electrophilic ruthenation pathway instead of a direct C-H activation. Stereoelectronic effect of meta-substituents on the N-arylthiourea dictates the final regioselective outcome of the reaction.
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Affiliation(s)
- Shivani Sharma
- Department of Chemistry, ‡Department of Pharmacy, School of Chemical Sciences and Pharmacy, Central University of Rajasthan , Bandarsindri, Kishangarh - 305 817, Rajasthan, India
| | - Ramdas S Pathare
- Department of Chemistry, ‡Department of Pharmacy, School of Chemical Sciences and Pharmacy, Central University of Rajasthan , Bandarsindri, Kishangarh - 305 817, Rajasthan, India
| | - Antim K Maurya
- Department of Chemistry, ‡Department of Pharmacy, School of Chemical Sciences and Pharmacy, Central University of Rajasthan , Bandarsindri, Kishangarh - 305 817, Rajasthan, India
| | - Kandasamy Gopal
- Department of Chemistry, ‡Department of Pharmacy, School of Chemical Sciences and Pharmacy, Central University of Rajasthan , Bandarsindri, Kishangarh - 305 817, Rajasthan, India
| | - Tapta Kanchan Roy
- Department of Chemistry, ‡Department of Pharmacy, School of Chemical Sciences and Pharmacy, Central University of Rajasthan , Bandarsindri, Kishangarh - 305 817, Rajasthan, India
| | - Devesh M Sawant
- Department of Chemistry, ‡Department of Pharmacy, School of Chemical Sciences and Pharmacy, Central University of Rajasthan , Bandarsindri, Kishangarh - 305 817, Rajasthan, India
| | - Ram T Pardasani
- Department of Chemistry, ‡Department of Pharmacy, School of Chemical Sciences and Pharmacy, Central University of Rajasthan , Bandarsindri, Kishangarh - 305 817, Rajasthan, India
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