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Das TK, Ghosh P, Ghosh S, Das S. Palladium-Catalyzed, Site-Selective C(sp 2)8-H Halogenation and Nitration of 4-Quinolone Derivatives. J Org Chem 2024; 89:11467-11479. [PMID: 39088747 DOI: 10.1021/acs.joc.4c01133] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/03/2024]
Abstract
Selective installation of halo and nitro groups in heterocyclic backbone through a transition-metal-catalyzed C-H bond activation strategy is immensely alluring to access high-value scaffolds. Here in, we disclosed N-pyrimidyl-directed assisted palladium(II)-catalyzed C(sp2)8-H halogenation and nitration of substituted 4-quinolone derivatives in the presence of N-halosuccinimide and tert-butyl nitrite, respectively, offering structurally diversified 8-halo/nitro-embedded 4-quinolone frameworks in high yields. Mechanistic studies indicated that the reaction follows an organometallic pathway with a reversible C-H metalation step. This operationally simple protocol is scalable with a broad substrate scope and excellent functional group compatibility. Moreover, the postdiversifications of the synthesized derivatives are also showcased to ensure the synthetic versatility of the methodology.
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Affiliation(s)
- Tapas Kumar Das
- TCG Lifesciences Pvt. Ltd., BN-7, Sector-V, Salt Lake City, Kolkata 700091, India
- Department of Chemistry, University of North Bengal, Darjeeling 734013, India
| | - Prasanjit Ghosh
- Department of Chemistry, University of North Bengal, Darjeeling 734013, India
| | - Shibaji Ghosh
- Department of Chemistry, CSIR Salt and Marine Chemicals Research Institute, G. B. Marg, Bhavnagar 364002, India
| | - Sajal Das
- Department of Chemistry, University of North Bengal, Darjeeling 734013, India
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Hajra AK, Ghosh P, Roy C, Kundu M, Ghosh S, Das S. Copper(II)-catalyzed, site-selective C(sp) 2-H amination using 8-aminoimidazo[1,2- a]pyridine (8-AIP) as a directing group. Org Biomol Chem 2024; 22:6617-6630. [PMID: 39101878 DOI: 10.1039/d4ob01008f] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/06/2024]
Abstract
An efficient copper(II)-catalyzed regioselective ortho C(sp2)-H amination of arenes/heteroarenes has been developed with the assistance of 8-AIP (8-aminoimidazo[1,2-a]pyridine) as an efficacious 6,5-fused bicyclic removable chelating auxiliary. This operationally simple approach is scalable, has a broad substrate scope, and is highly compatible with functional groups. Furthermore, post-diversification of the synthesized derivatives demonstrates the methodology's synthetic adaptability.
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Affiliation(s)
- Arun Kumar Hajra
- TCG Life Sciences Pvt. Ltd, BN-7, Salt Lake City, Kolkata-700091, India.
- Department of Chemistry, University of North Bengal, Darjeeling-734013, India.
| | - Prasanjit Ghosh
- Department of Chemistry, University of North Bengal, Darjeeling-734013, India.
| | - Chandrayee Roy
- TCG Life Sciences Pvt. Ltd, BN-7, Salt Lake City, Kolkata-700091, India.
| | - Mrinalkanti Kundu
- TCG Life Sciences Pvt. Ltd, BN-7, Salt Lake City, Kolkata-700091, India.
| | - Shibaji Ghosh
- Department of Chemistry, CSIR-Central Salt & Marine Chemicals Research Institute, Bhavnagar, Gujarat, 364002, India
| | - Sajal Das
- Department of Chemistry, University of North Bengal, Darjeeling-734013, India.
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Shah TA, Sarkar T, Kar S, Maharana PK, Talukdar K, Punniyamurthy T. Transition-Metal-Catalyzed Directed C-H Functionalization in/on Water. Chem Asian J 2024; 19:e202300815. [PMID: 37932013 DOI: 10.1002/asia.202300815] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2023] [Indexed: 11/08/2023]
Abstract
Directing group assisted C-H bond functionalization using transition-metal-catalysis has emerged as a reliable synthetic tool for the construction of regioselective carbon-carbon/heteroatom bonds. Off late, "in/on water directed transition-metal-catalysis", though still underdeveloped, has appeared as one of the prominent themes in sustainable organic chemistry. This article covers the advancements, mechanistic insights and application of the sustainable directed C-H bond functionalization of (hetero)arenes in/on water in the presence of transition-metal-catalysis.
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Affiliation(s)
- Tariq A Shah
- Department of Chemistry and Advanced Material Chemistry Center (AMCC), Khalifa University, PO Box, 127788, Abu Dhabi, U.A.E
| | - Tanumay Sarkar
- Department of Chemistry, Indian Institute of Technology Guwahati, Guwahati, 781039, India
| | - Subhradeep Kar
- Department of Chemistry, Indian Institute of Technology Guwahati, Guwahati, 781039, India
| | - Prabhat Kumar Maharana
- Department of Chemistry, Indian Institute of Technology Guwahati, Guwahati, 781039, India
| | - Kangkan Talukdar
- Department of Chemistry, Indian Institute of Technology Guwahati, Guwahati, 781039, India
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Hajra AK, Ghosh P, Paul P, Kundu M, Das S. Copper(II)-Mediated, Site-Selective C(sp 2)-H Sulfonamidation of 1-Naphthylamines. J Org Chem 2023. [PMID: 38048479 DOI: 10.1021/acs.joc.3c01852] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/06/2023]
Abstract
An operationally simple and efficient protocol for copper(II)-mediated, picolinamido-directed C8-H sulfonamidation of 1-naphthylamine derivatives with various sulfonamides has been developed. Remarkably, this cross-dehydrogenative C-H/H-N coupling reaction exhibits a broad substrate scope with excellent functional group tolerance, is scalable, and enables an expeditious route to a library of unsymmetrical N-arylated sulfonamides in good to excellent yields with exclusive site selectivity.
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Affiliation(s)
- Arun Kumar Hajra
- TCG Lifesciences Pvt. Ltd., BN-7, Sector-V, Salt Lake City,Kolkata700091,India
- Department of Chemistry, University of North Bengal, Darjeeling734013,India
| | - Prasanjit Ghosh
- Department of Chemistry, University of North Bengal, Darjeeling734013,India
| | - Priyanka Paul
- TCG Lifesciences Pvt. Ltd., BN-7, Sector-V, Salt Lake City,Kolkata700091,India
| | - Mrinalkanti Kundu
- TCG Lifesciences Pvt. Ltd., BN-7, Sector-V, Salt Lake City,Kolkata700091,India
| | - Sajal Das
- Department of Chemistry, University of North Bengal, Darjeeling734013,India
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Manna P, Kundu M, Roy A, Adhikari S. Palladium-catalyzed directed synthesis of ortho-deuterated phenylacetic acid and analogues. Org Biomol Chem 2021; 19:6244-6249. [PMID: 34155489 DOI: 10.1039/d1ob00663k] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
The synthesis of deuterium-labeled organic compounds is of increased interest, especially after the approval of deutetrabenazine by the Food and Drug Administration in 2014. The selective incorporation of deuterium in the place of hydrogen not only represents uniqueness in terms of a novel chemical class, but it also can improve the pharmacokinetic profiles of drug molecules while retaining potency and other parameters; thus, hydrogen-deuterium (H/D) exchange methods have been proven to be powerful additions in different areas of chemical science. In that regard, metal-catalyzed deuterium labeling via C-H activation mediated by a unique inbuilt directing group (DG) can play a significant role in the synthesis of novel deuterated chemical entities. In this context, herein, we divulge our results relating to Pd(ii)-catalyzed deuterium incorporation (>97%) at the γ C(sp2)-position of pyridone-containing phenylacetic acid derivatives, where 3-amino-1-methyl-1H-pyridin-2-one (AMP) not only acts as an efficient N,O-directing group, but it also constitutes a part of the target molecules of medicinal importance. Our methodology, which has been optimized based on the effects of temperature, catalyst, time, and substrate scope, shows advantages over existing protocols, with non-selectivity or meager deuteration or the use of an expensive metal (catalytic or super stoichiometric) and a deuterated solvent, reported previously for the deuteration of phenylacetic acid and its derivatives. Moreover, towards our aim of synthesizing deuterium-labeled biologically relevant compounds, the gram scale synthesis of a deuterated analogue of biphenyl acetic acid (3), known to have activity against epileptic seizures, has also been successfully accomplished in high yields and with excellent isotope enrichment via implementing this protocol.
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Affiliation(s)
- Priyadarshi Manna
- TCG Lifesciences Pvt. Ltd, BN-7, Sector V, Salt Lake City, Kolkata-700091, India. and Department of Chemistry, University of Calcutta, 92, A. P. C. Road, Kolkata 700009, India.
| | - Mrinalkanti Kundu
- TCG Lifesciences Pvt. Ltd, BN-7, Sector V, Salt Lake City, Kolkata-700091, India.
| | - Ashis Roy
- TCG Lifesciences Pvt. Ltd, BN-7, Sector V, Salt Lake City, Kolkata-700091, India. and Department of Chemistry, University of Calcutta, 92, A. P. C. Road, Kolkata 700009, India.
| | - Susanta Adhikari
- Department of Chemistry, University of Calcutta, 92, A. P. C. Road, Kolkata 700009, India.
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