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Saini RK, Borpatra PJ, Chaubey TN, Pandey SK. I 2-Mediated Site-Selective C-H Functionalization: Access to p-Amino-Substituted Unsymmetrical Benzils and Quinoxalines from Sulfoxonium Ylides. J Org Chem 2024; 89:5536-5545. [PMID: 38569000 DOI: 10.1021/acs.joc.3c02975] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/05/2024]
Abstract
An I2-mediated approach for selective C-H functionalization of unprotected aniline derivatives for synthesizing benzils and quinoxaline derivatives from sulfoxonium ylides has been described. Aniline derivatives and sulfoxonium ylides ornamented with different functional groups showed good compatibility. They afforded the corresponding products with moderate to high yields via a mild and simple procedure. Finally, we validated the practicality of this method by scaling up the reaction and further conversion of the synthesized derivatives into other valuable molecules.
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Affiliation(s)
- Rahul Kumar Saini
- Department of Chemistry, Institute of Science, Banaras Hindu University, Varanasi-221 005, Uttar Pradesh, India
| | - Paran J Borpatra
- Department of Chemistry, Institute of Science, Banaras Hindu University, Varanasi-221 005, Uttar Pradesh, India
| | - Trayambek Nath Chaubey
- Department of Chemistry, Institute of Science, Banaras Hindu University, Varanasi-221 005, Uttar Pradesh, India
| | - Satyendra Kumar Pandey
- Department of Chemistry, Institute of Science, Banaras Hindu University, Varanasi-221 005, Uttar Pradesh, India
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2
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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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3
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Goswami D, Mishra D, Phukan P. Silver acetate-catalyzed synthesis of cyclic sulfonyl guanidine with exocyclic double bond. Mol Divers 2023; 27:2545-2553. [PMID: 36376719 DOI: 10.1007/s11030-022-10568-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2022] [Accepted: 11/05/2022] [Indexed: 11/16/2022]
Abstract
An efficient protocol for the synthesis of cyclic guanidine with exocyclic double bond has been developed. The synthesis has been achieved via intramolecular hydroamination of an intermediate propargyl guanidine by using silver acetate as catalyst in the presence of acetic acid. The reaction proceeds via the formation of acyclic propargyl guanidine in a one-pot reaction of N,N-dibromoarylsulfonamides, isonitriles, and propargylamine in the presence of K2CO3. In the second stage of the synthesis, the acyclic guanidine selectively undergoes 5-exo-dig cyclization in the presence of silver acetate and acetic acid to produce the five-membered cyclic guanidine framework having an exocyclic double bond as the constituent part. Short reaction time, wide substrate scope with good to high yields, and good functional group tolerance are the remarkable achievement of the present protocol.
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Affiliation(s)
- Dikshita Goswami
- Department of Chemistry, Gauhati University, Guwahati, Assam, 781014, India
| | - Debashish Mishra
- Department of Chemistry, Gauhati University, Guwahati, Assam, 781014, India
| | - Prodeep Phukan
- Department of Chemistry, Gauhati University, Guwahati, Assam, 781014, India.
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4
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Mishra D, Rajkhowa S, Phukan P. Unanticipated switch of reactivity of isonitrile via N≡C bond scission: Cascade formation of symmetrical sulfonyl guanidine. iScience 2023; 26:107258. [PMID: 37520733 PMCID: PMC10384224 DOI: 10.1016/j.isci.2023.107258] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2023] [Revised: 05/02/2023] [Accepted: 06/27/2023] [Indexed: 08/01/2023] Open
Abstract
Unanticipated formation of symmetrical sulfonyl guanidine was observed while treating isonitriles with N,N-dibromoarylsulfonamides in absence of an external amine source. Interesting feature of this work is that one molecule of isonitrile initially reacts with dibromoarylsulfonamide via the C-end to produce the intermediate carbodiimide while the other molecule undergoes C≡N triple bond cleavage to react as amine source with the intermediate. This switch of reactivity from C-center to N-center of the isonitrile generated symmetrical guanidine.
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Affiliation(s)
- Debashish Mishra
- Department of Chemistry, Gauhati University, Guwahati, Assam 781014, India
| | - Sagarika Rajkhowa
- Department of Chemistry, Gauhati University, Guwahati, Assam 781014, India
| | - Prodeep Phukan
- Department of Chemistry, Gauhati University, Guwahati, Assam 781014, India
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5
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Mishra D, Loukrakpam DC, Neog SR, Hazarika D, Phukan P. A Switchable Protocol for Selective Synthesis of
gem
‐Dibromo Compounds and Amides from Ketoximes using TsNBr
2. ChemistrySelect 2022. [DOI: 10.1002/slct.202203449] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Affiliation(s)
- Debashish Mishra
- Department of Chemistry Gauhati University Guwahati 781014 Assam India
| | | | - Smriti Rekha Neog
- Department of Chemistry Gauhati University Guwahati 781014 Assam India
| | - Debojit Hazarika
- Department of Chemistry Gauhati University Guwahati 781014 Assam India
| | - Prodeep Phukan
- Department of Chemistry Gauhati University Guwahati 781014 Assam India
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7
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Qadir T, Amin A, Salhotra A, Sharma PK, Jeelani I, Abe H. Recent advances in the synthesis of benzothiazole and its derivatives. CURR ORG CHEM 2021. [DOI: 10.2174/1385272826666211229144446] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Abstract:
Benzothiazoles have recognized pharmacophores in the field of research, predominantly in synthetic and medicinal chemistry, on account of their significant pharmaceutical properties. This important class of derivatives endows an extensive range of biological activities like anti-inflammatory, antidiabetic, anticancer, anticonvulsant, antibacterial, antiviral, antioxidant, antituberculosis, enzyme inhibitors, etc. Hence, various methodologies have been accomplished to synthesize benzothiazole compounds considering the purity, yield, and selectivity of the products. This review provides different reaction methods that are involved in the synthesis of a variety of benzothiazole derivatives.
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Affiliation(s)
- Tanzeela Qadir
- Department of Chemistry, School of Chemical Engineering and Physical Sciences, Lovely Professional University, Phagwara, Punjab, India
| | - Andleeb Amin
- Department of Chemistry, School of Chemical Engineering and Physical Sciences, Lovely Professional University, Phagwara, Punjab, India
| | - Alka Salhotra
- Department of Chemistry, School of Chemical Engineering and Physical Sciences, Lovely Professional University, Phagwara, Punjab, India
| | - Praveen Kumar Sharma
- Department of Chemistry, School of Chemical Engineering and Physical Sciences, Lovely Professional University, Phagwara, Punjab, India
| | - Ishtiaq Jeelani
- Graduate School of Innovative Life Science, University of Toyama, 3190 Gofuku 930-8555, Japan
| | - Hitoshi Abe
- Faculty of Engineering, University of Toyama, 3190 Gofuku 930-8555, Japan
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8
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Zhang S, Wang S, Leng Y, Wu Y. One-pot synthesis of 2-acylbenzothiazoles from 2-aminobenzenethiols and arylacetonitriles via cyclization and sequential oxidation. Tetrahedron Lett 2021. [DOI: 10.1016/j.tetlet.2021.153300] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
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10
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Kvashnin Y, Verbitskiy EV, Zhilina EF, Rusinov GL, Chupakhin ON, Charushin VN. Synthesis of Heteroannulated Indolopyrazines through Domino N-H Palladium-Catalyzed/Metal-Free Oxidative C-H Bond Activation. ACS OMEGA 2020; 5:15681-15690. [PMID: 32637843 PMCID: PMC7331205 DOI: 10.1021/acsomega.0c01945] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 04/28/2020] [Accepted: 06/05/2020] [Indexed: 06/11/2023]
Abstract
A convenient approach to [1,2,5]oxadiazolo[3',4':5,6]pyrazino[2,3-b]indoles and their heteroannulated analogues bearing various aryl substituents in the backbone has been developed. This synthetic protocol is based on Pd-catalyzed Buchwald-Hartwig and subsequent annulation by intramolecular oxidative cyclodehydrogenation. The photophysical properties for new polycycles have been measured.
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Affiliation(s)
- Yuriy
A. Kvashnin
- I.
Postovsky Institute of Organic Synthesis, Ural Branch of the Russian Academy of Sciences, S. Kovalevskaya Str., 22, Ekaterinburg 620108, Russia
| | - Egor V. Verbitskiy
- I.
Postovsky Institute of Organic Synthesis, Ural Branch of the Russian Academy of Sciences, S. Kovalevskaya Str., 22, Ekaterinburg 620108, Russia
- Ural
Federal University, Mira
St. 19, Ekaterinburg 620002, Russia
| | - Ekaterina F. Zhilina
- I.
Postovsky Institute of Organic Synthesis, Ural Branch of the Russian Academy of Sciences, S. Kovalevskaya Str., 22, Ekaterinburg 620108, Russia
| | - Gennady L. Rusinov
- I.
Postovsky Institute of Organic Synthesis, Ural Branch of the Russian Academy of Sciences, S. Kovalevskaya Str., 22, Ekaterinburg 620108, Russia
- Ural
Federal University, Mira
St. 19, Ekaterinburg 620002, Russia
| | - Oleg N. Chupakhin
- I.
Postovsky Institute of Organic Synthesis, Ural Branch of the Russian Academy of Sciences, S. Kovalevskaya Str., 22, Ekaterinburg 620108, Russia
- Ural
Federal University, Mira
St. 19, Ekaterinburg 620002, Russia
| | - Valery N. Charushin
- I.
Postovsky Institute of Organic Synthesis, Ural Branch of the Russian Academy of Sciences, S. Kovalevskaya Str., 22, Ekaterinburg 620108, Russia
- Ural
Federal University, Mira
St. 19, Ekaterinburg 620002, Russia
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11
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Mishra D, Borah AJ, Phukan P, Hazarika D, Phukan P. Unprecedented 1,3-tert-butyl migration via the C–N single bond scission of isonitrile: an expedient metal-free route to N-sulfonyl amidines. Chem Commun (Camb) 2020; 56:8408-8411. [DOI: 10.1039/d0cc02430a] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Treatment of tert-butyl isonitrile with ArSO2NBr2 and nitrile led to simultaneous C–N single bond scission of isonitrile and migration of tert-alkyl group to nitrogen centre of the nitrile precursor, resulting in the formation of N-sufonyl amidine.
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12
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Loukrakpam DC, Phukan P. Metal‐Free One‐Pot Conversion of Olefins and Alkynes to Amides Using TsNBr
2
, I
2
and Aqueous NH
3
at Room Temperature. ChemistrySelect 2019. [DOI: 10.1002/slct.201901530] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Affiliation(s)
| | - Prodeep Phukan
- Department of ChemistryGauhati University, Guwahati 781014 Assam India
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