1
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Li L, Ji MM, Tang Y, Wang WF, Peng JB. Palladium-Catalyzed Cascade Carbonylation Reaction: Synthesis of Fused Isoindolinones. Org Lett 2024; 26:5625-5629. [PMID: 38953484 DOI: 10.1021/acs.orglett.4c01451] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/04/2024]
Abstract
A palladium-catalyzed cascade carbonylation reaction of 2-bromo-N-(2-iodophenyl)benzamides with benzylidenecyclopropanes for the synthesis of fused isoindolinone derivatives has been developed. A broad range of 6/5/6/6 tetracyclic isoindolinone products were efficiently prepared in moderate to good yields with diverse substitution. Two carbonyl groups were incorporated into the substrates in a single step with the formation of four carbon-carbon bonds and two carbon-heteroatom bonds.
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Affiliation(s)
- Lin Li
- School of Pharmacy and Food Engineering, Wuyi University, Jiangmen, Guangdong 529020, P. R. China
| | - Miao-Miao Ji
- School of Pharmacy and Food Engineering, Wuyi University, Jiangmen, Guangdong 529020, P. R. China
| | - Ying Tang
- School of Pharmacy and Food Engineering, Wuyi University, Jiangmen, Guangdong 529020, P. R. China
| | - Wei-Feng Wang
- School of Pharmacy and Food Engineering, Wuyi University, Jiangmen, Guangdong 529020, P. R. China
- State Key Laboratory of Applied Organic Chemistry & College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou 730000, P. R. China
| | - Jin-Bao Peng
- School of Pharmacy and Food Engineering, Wuyi University, Jiangmen, Guangdong 529020, P. R. China
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2
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Lalji RSK, Prince, Gupta M, Kumar S, Kumar A, Singh BK. Rhodium-catalyzed selenylation and sulfenylation of quinoxalinones 'on water'. RSC Adv 2023; 13:6191-6198. [PMID: 36814880 PMCID: PMC9940630 DOI: 10.1039/d2ra07400a] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2022] [Accepted: 02/08/2023] [Indexed: 02/22/2023] Open
Abstract
A rhodium-catalysed, regioselective synthetic methodology for selenylation and sulfenylation of 3-phenyl quinoxolinones has been developed through N-directed C-H activation in the presence of silver triflimide, and silver carbonate using dichalcogenides 'on water'. The methodology has been proven to be efficient, regioselective and green. Using this method, a range of selenylations and sulfenylations of the substrates has been carried out in good to excellent yields. Further, late-stage functionalisation produced potential anti-tumour, anti-fungal and anti-bacterial agents making these compounds potential drug candidates.
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Affiliation(s)
- Ram Sunil Kumar Lalji
- Bio-Organic Research Laboratory, Department of Chemistry, University of Delhi Delhi 110007 India .,Department of Chemistry, Kirori Mal College, University of Delhi Delhi 110007 India
| | - Prince
- Bio-Organic Research Laboratory, Department of Chemistry, University of DelhiDelhi 110007India
| | - Mohit Gupta
- Bio-Organic Research Laboratory, Department of Chemistry, University of Delhi Delhi 110007 India .,Department of Chemistry, L. N. M. S. College Supaul Birpur Bihar 8543340 India
| | - Sandeep Kumar
- Bio-Organic Research Laboratory, Department of Chemistry, University of Delhi Delhi 110007 India
| | - Amit Kumar
- Department of Chemistry, IIT PatnaBihar 801106India
| | - Brajendra Kumar Singh
- Bio-Organic Research Laboratory, Department of Chemistry, University of Delhi Delhi 110007 India
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3
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Shi R, Wang X, Zhang X, Chen S, Wang ZL, Qi H, Xu XM. Acid/Base-Steered Cascade Cyclization: An Efficient One-Pot Access to Diverse Isobenzofuranone and Isoindolobenzoxazinone Derivatives. Molecules 2023; 28:molecules28031443. [PMID: 36771107 PMCID: PMC9921644 DOI: 10.3390/molecules28031443] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/02/2023] [Revised: 01/28/2023] [Accepted: 01/30/2023] [Indexed: 02/05/2023] Open
Abstract
We herein report the acid/base-steered two distinct reaction pathways of 2-acylbenzoic acids with isatoic anhydrides. In the presence of Na2CO3, the cascade process consists of the cyclization of 2-acetylbenzoic acid and nucleophilic ring-opening reaction of isatoic anhydride to furnish isobenzofuranone derivatives with high efficiency. However, p-toluenesulfonic acid can promote the product isobenzofuranones to undergo sequential intramolecular rearrangment, nucleophilic addition and cyclization reaction to produce diverse isoindolobenzoxazinones in good yields. The synthetic utility of this method was further demonstrated by the gram-scale preparation of the desired products and the facile transformations of the resulting products.
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Affiliation(s)
- Ran Shi
- College of Chemistry and Chemical Engineering, Yantai University, Yantai 264005, China
| | - Xiangmin Wang
- College of Chemistry and Chemical Engineering, Yantai University, Yantai 264005, China
- Correspondence: (X.W.); (Z.-L.W.); (X.-M.X.)
| | - Xuesi Zhang
- College of Chemistry and Chemical Engineering, Yantai University, Yantai 264005, China
| | - Sen Chen
- College of Chemistry and Chemical Engineering, Yantai University, Yantai 264005, China
| | - Zu-Li Wang
- National Engineering Research Center of Low-Carbon Processing and Utilization of Forest Biomass, Nanjing Forestry University, Nanjing 210037, China
- College of Chemistry and Pharmaceutical Sciences, Qingdao Agricultural University, Qingdao 266109, China
- Correspondence: (X.W.); (Z.-L.W.); (X.-M.X.)
| | - Huijing Qi
- College of Chemistry and Chemical Engineering, Yantai University, Yantai 264005, China
| | - Xin-Ming Xu
- College of Chemistry and Chemical Engineering, Yantai University, Yantai 264005, China
- Correspondence: (X.W.); (Z.-L.W.); (X.-M.X.)
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4
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Xu XM, Shi R, Li W, Zhang X, Chen S, Wang ZL, Wang X. One-Pot Synthesis of Diverse Isoindolobenzoxazinone and Isoindoloquinazolinone Derivatives through a Transition Metal-Free Cascade Cyclization. J Mol Struct 2023. [DOI: 10.1016/j.molstruc.2023.135105] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
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5
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Kumar S, Prince P, Monika M, Kumar P, Len C, Singh BK. A Unified, Microwave‐Assisted, Palladium‐Catalyzed Regioselective Ortho‐monohalogenation of 1‐Alkyl/benzyl‐3‐Phenylquinoxalin‐2(1
H
)‐ones. ChemistrySelect 2023. [DOI: 10.1002/slct.202204821] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Affiliation(s)
- Sandeep Kumar
- Bio-Organic Research Laboratory Department of Chemistry University of Delhi Delhi 110 007 India
| | - Prince Prince
- Bio-Organic Research Laboratory Department of Chemistry University of Delhi Delhi 110 007 India
| | - Monika Monika
- Bio-Organic Research Laboratory Department of Chemistry University of Delhi Delhi 110 007 India
| | - Prashant Kumar
- Bio-Organic Research Laboratory Department of Chemistry University of Delhi Delhi 110 007 India
- Department of Chemistry SRM University Delhi-NCR Sonepat Haryana 131029 India
| | - Christophe Len
- Bio-Organic Research Laboratory Department of Chemistry University of Delhi Delhi 110 007 India
- Chimie ParisTech PSL Research University CNRS Institute of Chemistry for Life and Health Sciences 11 rue Pierre et Marie Curie F-75005 Paris France
| | - Brajendra K. Singh
- Bio-Organic Research Laboratory Department of Chemistry University of Delhi Delhi 110 007 India
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6
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Kumar S, Prince, Gupta M, Lalji RSK, Singh BK. Microwave assisted regioselective halogenation of benzo[ b][1,4]oxazin-2-ones via sp 2 C-H functionalization. RSC Adv 2023; 13:2365-2371. [PMID: 36741130 PMCID: PMC9841512 DOI: 10.1039/d2ra07259a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2022] [Accepted: 12/28/2022] [Indexed: 01/18/2023] Open
Abstract
A microwave assisted, palladium-catalyzed regioselective halogenation of 3-phenyl-2H-benzo[b][1,4]oxazin-2-ones has been demonstrated using inexpensive and readily available N-halosuccinimide. The reaction utilizes the nitrogen atom present in the heterocyclic ring as the directing group to afford regioselective halogenated products in good to moderate yields. The established protocol provides wide substrate scope, high functional group tolerance, and high atom and step economy. The reaction proved to be cost-effective and time-saving as it required only a few minutes for completion and is amenable to gram scale. The halogen atoms present in synthesized products provide further scope for post-functionalization. Several post-functionalized products have also been synthesised to demonstrate the high utility of the reaction in the field of drug discovery and late-stage functionalization.
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Affiliation(s)
- Sandeep Kumar
- Bio-Organic Research Laboratory, Department of Chemistry, University of DelhiDelhi110007India
| | - Prince
- Bio-Organic Research Laboratory, Department of Chemistry, University of DelhiDelhi110007India
| | - Mohit Gupta
- Bio-Organic Research Laboratory, Department of Chemistry, University of DelhiDelhi110007India
| | - Ram Sunil Kumar Lalji
- Bio-Organic Research Laboratory, Department of Chemistry, University of DelhiDelhi110007India,Department of Chemistry, Kirori-mal College, Delhi UniversityDelhi110007India
| | - Brajendra K. Singh
- Bio-Organic Research Laboratory, Department of Chemistry, University of DelhiDelhi110007India
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7
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Ruthenium-catalyzed regioselective N-directed C–H olefination of 2-phenylphthalazinone. CHEMICAL PAPERS 2022. [DOI: 10.1007/s11696-022-02221-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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8
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Prince, Kumar S, Lalji RSK, Gupta M, Kumar P, Kumar R, Singh BK. Sustainable C–H activation approach for palladium-catalyzed, regioselective functionalization of 1-methyl-3-phenyl quinoxaline-2(1 H)-ones in water. Org Biomol Chem 2022; 20:8944-8951. [DOI: 10.1039/d2ob01451c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
An environment-friendly approach for regioselective acylation of 1-methyl-3-phenyl quinoxaline-2(1H)-ones was developed using water as a solvent. The protocol exhibits a wide substrate scope and employs commercially available, non-toxic acyl surrogates.
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Affiliation(s)
- Prince
- Bio-organic Research Laboratory, Department of Chemistry, University of Delhi, Delhi-110007, India
- Department of Chemistry, Nanak Chand Anglo Sanskrit College, Meerut, Uttar Pradesh-250001, India
| | - Sandeep Kumar
- Bio-organic Research Laboratory, Department of Chemistry, University of Delhi, Delhi-110007, India
| | - Ram Sunil Kumar Lalji
- Bio-organic Research Laboratory, Department of Chemistry, University of Delhi, Delhi-110007, India
- Department of Chemistry, Kirori-Mal College, Delhi University, Delhi-110007, India
| | - Mohit Gupta
- Bio-organic Research Laboratory, Department of Chemistry, University of Delhi, Delhi-110007, India
- Department of Chemistry, L.N.M.S. College, Birpur, Supaul, Bihar-854340, India
| | - Prashant Kumar
- Bio-organic Research Laboratory, Department of Chemistry, University of Delhi, Delhi-110007, India
- Department of Chemistry, SRM University, Delhi-NCR Sonepat, Haryana-131029, India
| | - Ravindra Kumar
- CSIR-Central Drug Research Institute, Lucknow, Uttar Pradesh-226031, India
| | - Brajendra K. Singh
- Bio-organic Research Laboratory, Department of Chemistry, University of Delhi, Delhi-110007, India
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9
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Ma Z, Mahmudov KT, Aliyeva VA, Gurbanov AV, Guedes da Silva MFC, Pombeiro AJ. Peroxides in metal complex catalysis. Coord Chem Rev 2021. [DOI: 10.1016/j.ccr.2021.213859] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
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10
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Savela R, Méndez‐Gálvez C. Isoindolinone Synthesis via One-Pot Type Transition Metal Catalyzed C-C Bond Forming Reactions. Chemistry 2021; 27:5344-5378. [PMID: 33125790 PMCID: PMC8048987 DOI: 10.1002/chem.202004375] [Citation(s) in RCA: 28] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2020] [Revised: 10/30/2020] [Indexed: 11/06/2022]
Abstract
Isoindolinone structure is an important privileged scaffold found in a large variety of naturally occurring as well as synthetic, biologically and pharmaceutically active compounds. Owing to its crucial role in a number of applications, the synthetic methodologies for accessing this heterocyclic skeleton have received significant attention during the past decade. In general, the synthetic strategies can be divided into two categories: First, direct utilization of phthalimides or phthalimidines as starting materials for the synthesis of isoindolinones; and second, construction of the lactam and/or aromatic rings by different catalytic methods, including C-H activation, cross-coupling, carbonylation, condensation, addition and formal cycloaddition reactions. Especially in the last mentioned, utilization of transition metal catalysts provides access to a broad range of substituted isoindolinones. Herein, the recent advances (2010-2020) in transition metal catalyzed synthetic methodologies via formation of new C-C bonds for isoindolinones are reviewed.
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Affiliation(s)
- Risto Savela
- Johan Gadolin Process Chemistry CentreLaboratory of Molecular Science and TechnologyÅbo Akademi UniversityBiskopsgatan 820500TurkuFinland
| | - Carolina Méndez‐Gálvez
- Johan Gadolin Process Chemistry CentreLaboratory of Molecular Science and TechnologyÅbo Akademi UniversityBiskopsgatan 820500TurkuFinland
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11
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Sun X, Dong X, Liu H, Liu Y. Recent Progress in Palladium‐Catalyzed Radical Reactions. Adv Synth Catal 2021. [DOI: 10.1002/adsc.202001315] [Citation(s) in RCA: 17] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Affiliation(s)
- Xi Sun
- School of Chemistry Chemical Engineering Shandong University of Technology 266 West Xincun Road Zibo 255049 People's Republic of China
| | - Xu Dong
- School of Chemistry Chemical Engineering Shandong University of Technology 266 West Xincun Road Zibo 255049 People's Republic of China
| | - Hui Liu
- School of Chemistry Chemical Engineering Shandong University of Technology 266 West Xincun Road Zibo 255049 People's Republic of China
| | - Yuying Liu
- School of Chemistry Chemical Engineering Shandong University of Technology 266 West Xincun Road Zibo 255049 People's Republic of China
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12
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Kumar P, Dutta S, Kumar S, Bahadur V, Van der Eycken EV, Vimaleswaran KS, Parmar VS, Singh BK. Aldehydes: magnificent acyl equivalents for direct acylation. Org Biomol Chem 2020; 18:7987-8033. [PMID: 33000845 DOI: 10.1039/d0ob01458c] [Citation(s) in RCA: 22] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/14/2024]
Abstract
From the viewpoint of meeting the current green chemistry challenges in chemical synthesis, there is a need to disseminate how the cocktail of acylation and activation can play a pivotal role in affording bioactive acylated products comprising substituted ketone motifs in fewer reaction steps, with higher atom-economy and improved selectivity. In recent years, a significant number of articles employing the title compounds "aldehydes" as magnificent acylation surrogates which are less toxic and widely applicable have been published. This review sheds light on the compounds use for selective acylation of arene, heteroarene and alkyl (sp3, sp2 and sp) C-H bonds by proficient utilization of the C-H activation strategy. Critical insights into selective acylation of diverse moieties for the synthesis of bioactive compounds are presented in this review that will enable academic and industrial researchers to understand the mechanistic aspects involved and fruitfully employ these strategies in designing novel molecules.
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Affiliation(s)
- Prashant Kumar
- Department of Chemistry, SRM University Delhi-NCR, Sonepat, Haryana 131029, India. and Department of Chemistry, University of Delhi, Delhi 110007, India.
| | - Sriparna Dutta
- Department of Chemistry, University of Delhi, Delhi 110007, India.
| | - Sandeep Kumar
- Department of Chemistry, University of Delhi, Delhi 110007, India.
| | - Vijay Bahadur
- Department of Chemistry, SRM University Delhi-NCR, Sonepat, Haryana 131029, India. and Department of Chemistry, University of Delhi, Delhi 110007, India.
| | - Erik V Van der Eycken
- Laboratory for Organic & Microwave-Assisted Chemistry (LOMAC), Department of Chemistry, University of Leuven (KU Leuven), Celestijnenlaan 200F, B-3001 Leuven, Belgium and Peoples' Friendship University of Russia, (RUDN University) Miklukho-Maklaya, street 6, Moscow, 117198, Russia
| | | | - Virinder S Parmar
- Department of Chemistry and Environmental Science, Medgar Evers College, The City University of New York, 1638 Bedford Avenue, Brooklyn, NY 11225, USA
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13
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Lalji RSK, Kumar P, Gupta M, Parmar VS, Singh BK. Palladium‐Catalyzed Decarboxylative Synthesis of 5
H
‐Benzo[4,5][1,3]oxazino[2,3‐
a
]isoindole‐5,11(6a
H
)‐Diones using 2‐Phenyl‐4
H
‐Benzo[
d
][1,3]oxazin‐4‐Ones and α‐Oxo Carboxylic Acids. Adv Synth Catal 2020. [DOI: 10.1002/adsc.201901142] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Affiliation(s)
- Ram Sunil Kumar Lalji
- Bioorganic Laboratory, Department of Chemistry University of Delhi Delhi 110 007 India
- Department of Chemistry, Kirori Mal College University of Delhi Delhi 110007 India
| | - Prashant Kumar
- Bioorganic Laboratory, Department of Chemistry University of Delhi Delhi 110 007 India
- Department of Chemistry SRM University, Delhi-NCR Sonepat Haryana-131029 India
| | - Mohit Gupta
- Bioorganic Laboratory, Department of Chemistry University of Delhi Delhi 110 007 India
- Department of Chemistry, L.N.M.S. College B. N. Mandal University Birpur Bihar-854340 India
| | - Virinder S. Parmar
- Bioorganic Laboratory, Department of Chemistry University of Delhi Delhi 110 007 India
- Department of Chemistry and Environmental Science, Medgar Evers College The City University of New York Brooklyn, NY 11225 USA
| | - Brajendra K. Singh
- Bioorganic Laboratory, Department of Chemistry University of Delhi Delhi 110 007 India
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14
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Gupta M, Kumar S, Kumar P, Kumar Singh A, Bahadur V, K. Singh B. N‐Directed Pd‐Catalyzed Direct
ortho
‐Acetoxylation and
ortho
‐
tert
‐Butoxylation of 2‐Phenyl‐4
H
‐benzo[
d
][1,3]oxazin‐4‐ones via C‐H Activation. ChemistrySelect 2019. [DOI: 10.1002/slct.201902755] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Affiliation(s)
- Mohit Gupta
- Department of chemistryUniversity of DelhiBio-organic Research LaboratoryDepartment of Chemistry Delhi- 110007 India
- Department of ChemistryL.N.M.S College, Birpur Bihar- 854340 India
| | - Sandeep Kumar
- Department of chemistryUniversity of DelhiBio-organic Research LaboratoryDepartment of Chemistry Delhi- 110007 India
| | - Prashant Kumar
- Department of chemistryUniversity of DelhiBio-organic Research LaboratoryDepartment of Chemistry Delhi- 110007 India
- Department of ChemistrySRM University, Delhi-NCR Sonepat Haryana- 131029
| | - Amit Kumar Singh
- Department of chemistryUniversity of DelhiBio-organic Research LaboratoryDepartment of Chemistry Delhi- 110007 India
| | - Vijay Bahadur
- Department of chemistryUniversity of DelhiBio-organic Research LaboratoryDepartment of Chemistry Delhi- 110007 India
- Department of ChemistrySRM University, Delhi-NCR Sonepat Haryana- 131029
| | - Brajendra K. Singh
- Department of chemistryUniversity of DelhiBio-organic Research LaboratoryDepartment of Chemistry Delhi- 110007 India
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15
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Lee A, Zhu JL, Feoktistova T, Brueckner AC, Cheong PH, Scheidt KA. Carbene‐Catalyzed Enantioselective Decarboxylative Annulations to Access Dihydrobenzoxazinones and Quinolones. Angew Chem Int Ed Engl 2019. [DOI: 10.1002/ange.201900600] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Ansoo Lee
- Department of ChemistryCenter for Molecular Innovation and Drug DiscoveryNorthwestern University 2145 Sheridan Road Evanston IL 60208 USA
| | - Joshua L. Zhu
- Department of ChemistryCenter for Molecular Innovation and Drug DiscoveryNorthwestern University 2145 Sheridan Road Evanston IL 60208 USA
| | - Taisiia Feoktistova
- Department of ChemistryOregon State University 153 Gilbert Hall Corvallis OR 97331 USA
| | | | - Paul H.‐Y. Cheong
- Department of ChemistryOregon State University 153 Gilbert Hall Corvallis OR 97331 USA
| | - Karl A. Scheidt
- Department of ChemistryCenter for Molecular Innovation and Drug DiscoveryNorthwestern University 2145 Sheridan Road Evanston IL 60208 USA
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16
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Lee A, Zhu JL, Feoktistova T, Brueckner AC, Cheong PHY, Scheidt KA. Carbene-Catalyzed Enantioselective Decarboxylative Annulations to Access Dihydrobenzoxazinones and Quinolones. Angew Chem Int Ed Engl 2019; 58:5941-5945. [PMID: 30843323 DOI: 10.1002/anie.201900600] [Citation(s) in RCA: 37] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2019] [Revised: 02/15/2019] [Indexed: 12/16/2022]
Abstract
A direct decarboxylative strategy for the generation of aza-o-quinone methides (aza-o-QMs) by N-heterocyclic carbene (NHC) catalysis has been discovered and explored. This process requires no stoichiometric additives in contrast with current approaches. Aza-o-QMs react with trifluoromethyl ketones through a formal [4+2] manifold to access highly enantioenriched dihydrobenzoxazin-4-one products, which can be converted to dihydroquinolones through an interesting stereoretentive aza-Petasis-Ferrier rearrangement sequence. Complementary dispersion-corrected density functional theory (DFT) studies provided an accurate prediction of the reaction enantioselectivity and lend further insight to the origins of stereocontrol. Additionally, a computed potential energy surface around the major transition structure suggests a concerted asynchronous mechanism for the formal annulation.
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Affiliation(s)
- Ansoo Lee
- Department of Chemistry, Center for Molecular Innovation and Drug Discovery, Northwestern University, 2145 Sheridan Road, Evanston, IL, 60208, USA
| | - Joshua L Zhu
- Department of Chemistry, Center for Molecular Innovation and Drug Discovery, Northwestern University, 2145 Sheridan Road, Evanston, IL, 60208, USA
| | - Taisiia Feoktistova
- Department of Chemistry, Oregon State University, 153 Gilbert Hall, Corvallis, OR, 97331, USA
| | - Alexander C Brueckner
- Department of Chemistry, Oregon State University, 153 Gilbert Hall, Corvallis, OR, 97331, USA
| | - Paul H-Y Cheong
- Department of Chemistry, Oregon State University, 153 Gilbert Hall, Corvallis, OR, 97331, USA
| | - Karl A Scheidt
- Department of Chemistry, Center for Molecular Innovation and Drug Discovery, Northwestern University, 2145 Sheridan Road, Evanston, IL, 60208, USA
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17
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