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Mishra S, Aghi A, Kumar A. Rh(III)-Catalyzed Controlled Ortho-Amidation of Arylamides with Dioxazolones Using Weakly Coordinating Native Primary Amide as the Directing Group. J Org Chem 2024; 89:5606-5618. [PMID: 38557043 DOI: 10.1021/acs.joc.4c00116] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/04/2024]
Abstract
Herein, we report a controlled introduction of an amide unit at the ortho-position of an electron-deficient arylamide system without affording any cyclized products using user-friendly dioxazolone as an amidating reagent in the presence of a Rh(III)-catalyst. This is the first report where native primary amide has been utilized as a weakly coordinating group for site-selective C-N bond formation reaction. The developed protocol works under external auxiliary-free conditions with a wide substrate scope.
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Affiliation(s)
- Saksham Mishra
- Department of Chemistry, Indian Institute of Technology, Bihta, Patna 801106, Bihar, India
| | - Anjali Aghi
- Department of Chemistry, Indian Institute of Technology, Bihta, Patna 801106, Bihar, India
| | - Amit Kumar
- Department of Chemistry, Indian Institute of Technology, Bihta, Patna 801106, Bihar, India
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Baghel AS, Pratap R, Kumar A. Ru(II)-Catalyzed Weakly Coordinating Carbonyl-Assisted Dialkynylation of (Hetero)Aryl Ketones. J Org Chem 2023. [PMID: 37307505 DOI: 10.1021/acs.joc.3c00478] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
Functionalized aryl(heteroaryl) ketones are present in many natural products as key structural components and serve as basic synthetic building blocks for various organic transformation reactions. Therefore, the development of an effective and sustainable route for making these classes of compounds remains challenging yet highly desirable. Herein, we report a simple and efficient catalytic system for dialkynylation of aromatic/heteroaromatic ketones via a double C-H bond activation in the presence of less expensive ruthenium(II)-salt as a catalyst using the weakly and native carbonyl group as the desired directing group. The developed protocol is highly compatible, tolerant, and sustainable toward various functional groups. The synthetic utility of the developed protocol has been demonstrated through the scale-up synthesis and functional group transformation. Control experiments support the involvement of the base-assisted internal electrophilic substitution (BIES) reaction pathway.
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Affiliation(s)
- Akanksha Singh Baghel
- Department of Chemistry, Indian Institute of Technology Patna, Patna 801106, Bihar, India
| | - Ramendra Pratap
- Department of Chemistry, Delhi University, Delhi 110007, India
| | - Amit Kumar
- Department of Chemistry, Indian Institute of Technology Patna, Patna 801106, Bihar, India
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Baghel AS, Kumar A. Ru(II)-catalyzed external auxiliary-free primary amide-directed inverse Sonogashira reaction on (hetero)arylamides. Chem Commun (Camb) 2022; 58:11304-11307. [PMID: 36124904 DOI: 10.1039/d2cc03929j] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Herein, we report ruthenium(II)-catalyzed weakly coordinating primary amide-assisted ortho-di-alkynylation of (hetero)arylamides via double C-H bond activation in the presence of bromo-alkynes as coupling partners. The attractive features of the developed strategy lie in the usage of an inexpensive ruthenium(II)-salt, external auxiliary-free directing group and simple reaction conditions, along with a broad substrate scope, high reaction yields and scale-up synthesis.
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Affiliation(s)
- Akanksha Singh Baghel
- Department of Chemistry, Indian Institute of Technology Patna, Bihta 801106, Bihar, India.
| | - Amit Kumar
- Department of Chemistry, Indian Institute of Technology Patna, Bihta 801106, Bihar, India.
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Li W, Liu J, Zhou M, Ma L, Zhang M. Visible light-enabled regioselective chlorination of coumarins using CuCl 2via LMCT excitation. Org Biomol Chem 2022; 20:6667-6672. [PMID: 35943174 DOI: 10.1039/d2ob01134d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
An efficient, regioselective chlorination of coumarins using Earth-abundant and cost-effective CuCl2 under visible light irradiation is reported. A key feature of this protocol is the photocatalytic dissociation of the copper(II) complex in acetonitrile through ligand-to-metal charge transfer (LMCT) to give the chlorine atom which then selectively chlorinates the coumarin. This method can chlorinate a broad scope of coumarins with either electron-withdrawing or electron-donating substituents to regioselectively afford 3-chlorocoumarins in good to excellent yields and can be further extended to other electron-deficient heterocycles and olefins such as flavones, 8-methoxypsoralen and naphthoquinones.
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Affiliation(s)
- Weiming Li
- School of Chemistry and Chemical Engineering, Guangxi University, Nanning, Guangxi 530004, China.
| | - Jinshan Liu
- School of Chemistry and Chemical Engineering, Guangxi University, Nanning, Guangxi 530004, China.
| | - Min Zhou
- School of Chemistry and Chemical Engineering, Guangxi University, Nanning, Guangxi 530004, China.
| | - Lin Ma
- School of Chemistry and Chemical Engineering, Guangxi University, Nanning, Guangxi 530004, China.
| | - Min Zhang
- School of Chemistry and Chemical Engineering, Guangxi University, Nanning, Guangxi 530004, China.
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Baghel AS, Aghi A, Kumar A. Ru(II)-Catalyzed Controlled Cross-Dehydrogenative Coupling of Benzamides with Activated Olefins via Weakly Coordinating Primary Amides. J Org Chem 2021; 86:9744-9754. [PMID: 34196566 DOI: 10.1021/acs.joc.1c01090] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Abstract
Ru(II)-catalyzed regioselective ortho-alkenylation of primary benzamides with activated olefins has been realized over the competitive cyclized products. This reaction overall proceeds via a cross-dehydrogenative coupling (CDC) reaction using a simple and weakly coordinating primary amide group in the presence of an inexpensive Ru(II) salt and allows the controlled introduction of olefin motifs at the ortho-position of benzamides. The key to the success of this strategy depends on fine-tuning the reaction conditions. The developed protocol has demonstrated excellent regio/diastereoselectivity and a good functional group tolerance with wide substrate scope and obviates the requirement of external auxiliaries as well as the costly metal catalyst. Detailed mechanistic studies indicate the involvement of the base-assisted internal electrophilic-type substitution (BIES) step in the reaction mechanism.
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Affiliation(s)
- Akanksha Singh Baghel
- Department of Chemistry, Indian Institute of Technology Patna, Bihta, Bihar 801106, India
| | - Anjali Aghi
- Department of Chemistry, Indian Institute of Technology Patna, Bihta, Bihar 801106, India
| | - Amit Kumar
- Department of Chemistry, Indian Institute of Technology Patna, Bihta, Bihar 801106, India
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Thakur R, Jaiswal Y, Kumar A. Primary amides: Sustainable weakly coordinating groups in transition metal-catalyzed C–H bond functionalization reactions. Tetrahedron 2021. [DOI: 10.1016/j.tet.2021.132313] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
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Boddapati SNM, Tamminana R, Alam MM, Gugulothu S, Varala R, Bollikolla HB. Efficient Pd( ii)-catalyzed regioselective ortho-halogenation of arylcyanamides. NEW J CHEM 2021. [DOI: 10.1039/d1nj01998h] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
2-Halo arylcyanamides have been constructed from cyanamides via Pd(ii)-catalyzed selective ortho-halogenation under moderate reaction conditions.
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Affiliation(s)
- S. N. Murthy Boddapati
- Department of Chemistry, Acharya Nagarjuna University, N Nagar, Guntur, A. P-522510, India
- Department of Chemistry, Sir C R Reddy College, P G Courses, Eluru, A.P-534007, India
| | - Ramana Tamminana
- Department of Chemistry, GITAM Deemed to be University, Bengaluru Campus, Bengaluru Rural, Karnataka, 562163, India
| | - M. Mujahid Alam
- Department of Chemistry, College of Science, King Khalid University, PO Box 9004, Abha 61413, Saudi Arabia
| | - Sailaja Gugulothu
- Department of Chemistry, Acharya Nagarjuna University, N Nagar, Guntur, A. P-522510, India
| | | | - Hari Babu Bollikolla
- Department of Chemistry, Acharya Nagarjuna University, N Nagar, Guntur, A. P-522510, India
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Jaiswal Y, Mandal S, Das P, Kumar A. One-Pot Synthesis of Orange-Red Fluorescent Dimeric 2H-Pyrrolo[2,3-c]isoquinoline-2,5(3H)-diones from Benzamides and Maleimides via Ru(II)-Catalyzed Sequential C–C/C–N/C–C Bond Formation. Org Lett 2020; 22:1605-1610. [DOI: 10.1021/acs.orglett.0c00194] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Affiliation(s)
- Yogesh Jaiswal
- Department of Chemistry, Indian Institute of Technology Patna, Bihta 801106, Bihar, India
| | - Saptarshi Mandal
- Department of Chemistry, Indian Institute of Technology Patna, Bihta 801106, Bihar, India
| | - Prolay Das
- Department of Chemistry, Indian Institute of Technology Patna, Bihta 801106, Bihar, India
| | - Amit Kumar
- Department of Chemistry, Indian Institute of Technology Patna, Bihta 801106, Bihar, India
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Motati DR, Uredi D, Burra AG, Bowen JP, Fronczek FR, Smith CR, Watkins EB. Differential formation of nitrogen-centered radicals leading to unprecedented, regioselective bromination of N,N′-(1,2-phenylene)bisamides and 2-amidophenols. Org Chem Front 2020. [DOI: 10.1039/c9qo01508f] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Abstract
A highly efficient, site-selective, visible light-accelerated, remote C–H halogenation of unsymmetrical aromatic bisamides/amidoesters has been developed.
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Affiliation(s)
- Damoder Reddy Motati
- Center for Pharmacometrics and Molecular Discovery
- Department of Pharmaceutical Sciences
- College of Pharmacy
- Union University
- Jackson
| | - Dilipkumar Uredi
- Center for Pharmacometrics and Molecular Discovery
- Department of Pharmaceutical Sciences
- College of Pharmacy
- Union University
- Jackson
| | - Amarender Goud Burra
- Center for Pharmacometrics and Molecular Discovery
- Department of Pharmaceutical Sciences
- College of Pharmacy
- Union University
- Jackson
| | - J. Phillip Bowen
- Department of Pharmaceutical Sciences
- College of Pharmacy
- Mercer University
- Atlanta
- USA
| | | | - Clint R. Smith
- Center for Pharmacometrics and Molecular Discovery
- Department of Pharmaceutical Sciences
- College of Pharmacy
- Union University
- Jackson
| | - E. Blake Watkins
- Center for Pharmacometrics and Molecular Discovery
- Department of Pharmaceutical Sciences
- College of Pharmacy
- Union University
- Jackson
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