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Saini K, Manju, Raigar AK, Jyoti N, Guleria A. Thiourea as Bifunctional Hydrogen Bond Donor and Brønsted Base Catalyst for Green One-Pot Synthesis of 2-Aryl/Heteroaryl/Styryl Benzothiazoles in the Aqueous Medium under Ultrasound Irradiation. ACS OMEGA 2024; 9:8343-8351. [PMID: 38405534 PMCID: PMC10882698 DOI: 10.1021/acsomega.3c09164] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/17/2023] [Revised: 12/22/2023] [Accepted: 01/19/2024] [Indexed: 02/27/2024]
Abstract
A green organocatalysis cascade strategy using thiourea in catalytic amounts as both a hydrogen bond donor and a Brønsted base bifunctional catalyst was utilized to synthesize a series of 2-aryl/heteroaryl/styryl benzothiazole derivatives. This strategy involved an ultrasound-irradiated one-pot two-component reaction between substituted aldehydes and 2-amino thiophenols in an aqueous medium at 60 °C, using air as an oxidant. At the gram-scale, this protocol yielded 87% of the desired product, making it suitable for production at a larger scale. This green and mild protocol offers excellent yields, cost-effectiveness, atom economy, step economy, and a simple operation that does not require extra purification steps. Furthermore, the catalyst is easily recoverable and can be used for up to five cycles without a significant loss of any activity.
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Affiliation(s)
- Kamlesh Saini
- Department of Chemistry, University of Rajasthan, Jaipur 302004, India
| | - Manju
- Department of Chemistry, University of Rajasthan, Jaipur 302004, India
| | | | - Nirmal Jyoti
- Department of Chemistry, University of Rajasthan, Jaipur 302004, India
| | - Anjali Guleria
- Department of Chemistry, University of Rajasthan, Jaipur 302004, India
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Thavarajah R, Penny MR, Torii R, Hilton ST. Rapid Lewis Acid Screening and Reaction Optimization Using 3D-Printed Catalyst-Impregnated Stirrer Devices in the Synthesis of Heterocycles. J Org Chem 2023; 88:16845-16853. [PMID: 38011901 PMCID: PMC10729026 DOI: 10.1021/acs.joc.3c01601] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2023] [Revised: 10/30/2023] [Accepted: 10/31/2023] [Indexed: 11/29/2023]
Abstract
We describe the development of Lewis acid (LA) catalyst-impregnated 3D-printed stirrer devices and demonstrate their ability to facilitate the rapid screening of reaction conditions to synthesize heterocycles. The stereolithography 3D-printed stirrer devices were designed to fit round-bottomed flasks and Radleys carousel tubes using our recently reported solvent-resistant resin, and using CFD modeling studies and experimental data, we demonstrated that the device design leads to rapid mixing and rapid throughput over the device surface. Using a range of LA 3D-printed stirrers, the reaction between a diamine and an aldehyde was optimized for the catalyst and solvent, and we demonstrated that use of the 3D-printed catalyst-embedded devices led to higher yields and reduced reaction times. A library of benzimidazole and benzothiazole compounds were synthesized, and the use of devices led to efficient formation of the product as well as low levels of the catalyst in the resultant crude mixture. The use of these devices makes the process of setting up multiple reactions simpler by avoiding weighing out of catalysts, and the devices, once used, can be simply removed from the reaction, making the process of compound library synthesis more facile.
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Affiliation(s)
- Rumintha Thavarajah
- Department
of Pharmaceutical and Biological Chemistry, UCL School of Pharmacy, 29-39 Brunswick Square, London WC1N 1AX, U.K.
| | - Matthew R. Penny
- Department
of Pharmaceutical and Biological Chemistry, UCL School of Pharmacy, 29-39 Brunswick Square, London WC1N 1AX, U.K.
| | - Ryo Torii
- Department
of Mechanical Engineering, UCL, Torrington Place, London WC1E 7JE, U.K.
| | - Stephen T. Hilton
- Department
of Pharmaceutical and Biological Chemistry, UCL School of Pharmacy, 29-39 Brunswick Square, London WC1N 1AX, U.K.
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Xiong W, Peng X, Zhong R, Zheng J, Duo S, Gong S, Sun H, Sun Q. Construction of a Clock Catalytic System: Highly Efficient and Self‐Indicating Synthesis of Benzoheterocycles at Ambient Temperature. ASIAN J ORG CHEM 2021. [DOI: 10.1002/ajoc.202100508] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Affiliation(s)
- Wu‐Lin Xiong
- Jiangxi Key Laboratory of Organic Chemistry Jiangxi Science and Technology Normal University 605 Fenglin Ave Nanchang, Jiangxi 330013 P. R. China
| | - Xiao‐Chong Peng
- Jiangxi Key Laboratory of Organic Chemistry Jiangxi Science and Technology Normal University 605 Fenglin Ave Nanchang, Jiangxi 330013 P. R. China
| | - Ren‐Yuan Zhong
- Jiangxi Key Laboratory of Organic Chemistry Jiangxi Science and Technology Normal University 605 Fenglin Ave Nanchang, Jiangxi 330013 P. R. China
| | - Jianwei Zheng
- Department of Chemistry Northeastern University NO. 3–11, Wenhua Rd Shenyang, Liaoning 110819 P. R. China
| | - Shuwang Duo
- Jiangxi Key Laboratory of Organic Chemistry Jiangxi Science and Technology Normal University 605 Fenglin Ave Nanchang, Jiangxi 330013 P. R. China
| | - Shan‐Shan Gong
- Jiangxi Key Laboratory of Organic Chemistry Jiangxi Science and Technology Normal University 605 Fenglin Ave Nanchang, Jiangxi 330013 P. R. China
| | - Hong‐bin Sun
- Department of Chemistry Northeastern University NO. 3–11, Wenhua Rd Shenyang, Liaoning 110819 P. R. China
| | - Qi Sun
- Jiangxi Key Laboratory of Organic Chemistry Jiangxi Science and Technology Normal University 605 Fenglin Ave Nanchang, Jiangxi 330013 P. R. China
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4
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Synthesis of benzothiazoles using fluorescein as an efficient photocatalyst under visible light. MOLECULAR CATALYSIS 2021. [DOI: 10.1016/j.mcat.2021.111693] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
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Fu Q, Zhang R, Qiu H, Ma R, Ma Y. A New Method for the Synthesis of 2-Arylbenzothiazoles Oxidized by Selectfluor. CHINESE J ORG CHEM 2021. [DOI: 10.6023/cjoc202105010] [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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Ma R, Ding Y, Chen R, Wang Z, Wang L, Ma Y. Oxidant/Solvent-Controlled I 2-Catalyzed Domino Annulation for Selective Synthesis of 2-Aroylbenzothiazoles and 2-Arylbenzothiazoles under Metal-Free Conditions. J Org Chem 2020; 86:310-321. [PMID: 33332126 DOI: 10.1021/acs.joc.0c02095] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
A simple and practical domino protocol for the selective synthesis of 2-aroylbenzothiazoles and 2-aryl benzothiazoles catalyzed by I2 is developed under metal-free conditions. The reaction outcomes are exclusively controlled by the reaction oxidant/medium. With DMSO employed as both the solvent and the oxidant, an oxidation of aromatic methyl ketones takes precedence over the condensation with 2-aminobenzenethiols. On the other hand, when the reaction was carried out in PhNO2 or in 1,4-dioxane containing PhNO2, the condensation of aromatic methyl ketones with 2-aminobenzenethiols has priority to form imines which is followed by an oxidation of the methyl group from ketones to afford 2-arylbenzothiazoles as a sole product. The PhNO2/I2 co-catalytic system is proposed first time.
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Affiliation(s)
- Renchao Ma
- Institute of Advanced Studies and School of Pharmaceutical and Chemical Engineering, Taizhou University, Taizhou 318000, P R China
| | - Yuxin Ding
- Institute of Advanced Studies and School of Pharmaceutical and Chemical Engineering, Taizhou University, Taizhou 318000, P R China
| | - Rener Chen
- Institute of Advanced Studies and School of Pharmaceutical and Chemical Engineering, Taizhou University, Taizhou 318000, P R China
| | - Zhiming Wang
- Institute of Advanced Studies and School of Pharmaceutical and Chemical Engineering, Taizhou University, Taizhou 318000, P R China
| | - Lei Wang
- Institute of Advanced Studies and School of Pharmaceutical and Chemical Engineering, Taizhou University, Taizhou 318000, P R China
| | - Yongmin Ma
- Institute of Advanced Studies and School of Pharmaceutical and Chemical Engineering, Taizhou University, Taizhou 318000, P R China
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Luo P, Gan F, Lin J, Ding Q. Recent Advances in the Synthesis and Applications of 2-Arylbenzothiazoles. SYNTHESIS-STUTTGART 2020. [DOI: 10.1055/s-0040-1707208] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
This review firstly covers the applications of 2-arylbenzothiazoles as amyloid imaging agents, antitumor agents, and organic luminescent materials. Then we review the recent advances in the synthesis of 2-arylbenzothiazole derivatives. On the one hand, we introduce the approaches for construction of the 2-arylbenzothiazole core, including the following categories: (i) classic condensation of 2-aminothiophenols, (ii) direct arylation of benzothiazoles, (iii) intramolecular cyclization of thiobenzanilides, and (iv) tandem cyclization of anilines/ nitroarenes with elemental sulfur or sulfides. On the other hand, the transition-metal-catalyzed direct C–H functionalizations of 2-arylbenzothiazoles are also involved in this review.1 Introduction2 Applications of 2-Arylbenzothiazoles3 Construction of the 2-Arylbenzothiazole Core4 Synthesis 2-Arylbenzothiazoles via Direct C–H Functionalization5 Conclusion
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Affiliation(s)
- Puying Luo
- Department of Obstetrics and Gynecology, Jiangxi Provincial People’s Hospital
| | - Fuqiang Gan
- Department of Obstetrics and Gynecology, Jiangxi Provincial People’s Hospital
| | - Junyue Lin
- Key Laboratory of Functional Small Organic Molecule, Ministry of Education and Jiangxi's Key Laboratory of Green Chemistry, Jiangxi Normal University
- College of Chemistry & Chemical Engineering, Jinganshan University
| | - Qiuping Ding
- Key Laboratory of Functional Small Organic Molecule, Ministry of Education and Jiangxi's Key Laboratory of Green Chemistry, Jiangxi Normal University
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Li X, Li Y, Liu R, Wang Z, Li X, Shi D. AcOH-mediated aerobic oxidative synthesis of 2-thioalkylbenzothiazoles via a three-component reaction. Tetrahedron Lett 2020. [DOI: 10.1016/j.tetlet.2020.152054] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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9
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New synthetic approach for the preparation of 2-aryl-thiazolo[4,5-b]pyridines via Liebeskind–Srogl reaction. CHINESE CHEM LETT 2015. [DOI: 10.1016/j.cclet.2015.05.012] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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10
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Pereira Araujo D, Santos Morais VS, de Fátima Â, Modolo LV. Efficient sodium bisulfite-catalyzed synthesis of benzothiazoles and their potential as ureases inhibitors. RSC Adv 2015. [DOI: 10.1039/c5ra01081k] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023] Open
Abstract
In this work we report the successful use of sodium bisulfite as catalyst for the synthesis of 19 benzothiazoles (BZTs) under microwave irradiation with yields from 80% to 100%.
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Affiliation(s)
- Débora Pereira Araujo
- Grupo de Estudos em Química Orgânica e Biológica (GEQOB)
- Departamento de Química
- Instituto de Ciências Exatas
- Universidade Federal de Minas Gerais
- Belo Horizonte
| | - Vinicius Stefano Santos Morais
- Grupo de Estudos em Bioquímica de Plantas (GEBioPlan)
- Departamento de Botânica
- Instituto de Ciências Biológicas
- Universidade Federal de Minas Gerais
- Belo Horizonte
| | - Ângelo de Fátima
- Grupo de Estudos em Química Orgânica e Biológica (GEQOB)
- Departamento de Química
- Instituto de Ciências Exatas
- Universidade Federal de Minas Gerais
- Belo Horizonte
| | - Luzia Valentina Modolo
- Grupo de Estudos em Bioquímica de Plantas (GEBioPlan)
- Departamento de Botânica
- Instituto de Ciências Biológicas
- Universidade Federal de Minas Gerais
- Belo Horizonte
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