1
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Mandal PK, Patel S, Katukojvala S. Enal-azomethine ylides: application in the synthesis of functionalized pyrroles. Org Biomol Chem 2024; 22:5734-5738. [PMID: 38953694 DOI: 10.1039/d4ob00859f] [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
Rhodium-catalyzed [3 + 2] annulation of diazoenals and N-alkyl imines resulted in N-alkyl-pyrrole-3-carbaldehyde derivatives. The reaction involves thermal 6π-electrocyclization and aromatization of a new class of enal-azomethine ylides (EAYs). The EAYs derived from dihydroisoquinoline and 2H-azirine gave fused-pyrrole and pyridine derivatives, respectively. The synthetic importance of pyrrole products has been demonstrated by one-step synthesis of the biologically relevant pyrrolo[3,2-c]quinoline scaffold as well as pyrrolo[2,1-a]isoquinoline which is a core structure of lamellarin alkaloids.
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Affiliation(s)
- Pratap Kumar Mandal
- Department of Chemistry, Indian Institute of Science Education and Research, Bhopal, Madhya Pradesh, 462066 India.
| | - Sandeep Patel
- Department of Chemistry, Indian Institute of Science Education and Research, Bhopal, Madhya Pradesh, 462066 India.
| | - Sreenivas Katukojvala
- Department of Chemistry, Indian Institute of Science Education and Research, Bhopal, Madhya Pradesh, 462066 India.
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2
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Chennamsetti H, Rathore KS, Chatterjee S, Mandal PK, Katukojvala S. Triple Nucleophilic Head-to-Tail Cascade Polycyclization of Diazodienals via Combination Catalysis: Direct Access to Cyclopentane Fused Aza-Polycycles with Six-Contiguous Stereocenters. JACS AU 2024; 4:2099-2107. [PMID: 38938806 PMCID: PMC11200238 DOI: 10.1021/jacsau.4c00134] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/14/2024] [Revised: 04/15/2024] [Accepted: 04/15/2024] [Indexed: 06/29/2024]
Abstract
Reported herein are the bench stable (2E,4E)-diazohexa-2,4-dienals (diazodienals) and their unprecedented polycyclization with aldimine and arylamines enabled by Rh(II)/Brønsted acid relay catalysis. This scalable and atom-economical reaction provides direct access to the biologically important azatricyclo[6.2.1.04,11]undecane fused polycycles having six-contiguous stereocenters. Mechanistic studies revealed that polycyclization proceeds through an unusual triple-nucleophilic cascade initiated by aldimine attack on remote Rh-carbenoid, 6π-electrocyclization of aza-trienyl azomethine ylide, stereoselective aza-Michael addition via iminium activation, and inverse electron-demand intramolecular aza Diels-Alder reaction. The π-π secondary interactions play a crucial role in the preorganization of reactive intermediates for the pericyclic reactions and, hence, the overall efficiency of the polycyclization.
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Affiliation(s)
| | | | | | | | - Sreenivas Katukojvala
- Department of Chemistry, Indian
Institute of Science Education & Research
Bhopal, Bhopal, Madhya Pradesh 462066, India
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3
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Mandal PK, Katukojvala S. Rh-Catalyzed Chemodivergent [3+3] Annulations of Diazoenals and α-Aminoketones: Direct Synthesis of Functionalized 1,2-Dihydropyridines and Fused 1,4-Oxazines. Chemistry 2024; 30:e202303862. [PMID: 38165004 DOI: 10.1002/chem.202303862] [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: 11/21/2023] [Revised: 12/25/2023] [Accepted: 01/02/2024] [Indexed: 01/03/2024]
Abstract
Novel rhodium-catalyzed [3+3] annulations of diazoenals and α-amino ketones has been disclosed here. The reactivity of diazoenals has been switched from carbenoid to vinylogous NH-insertion by altering acyclic to cyclic α-amino ketones. In this direction, we report an efficient strategy to synthesize 1,2-dihydropyridines (DHPs) and fused 1,4-oxazines. Mechanistic investigation revealed that the formyl group is necessary for carbenoid [3+3] annulation and the cyclohexyl group is the dictating factor for vinylogous NH- insertion. The synthetic utility of 1,2-dihydropyridines was demonstrated by synthesizing piperidine, pyrido[1,2-a]indole, and 2-pyridone scaffolds. Further, structural diversification of fused 1,4-oxazines resulted in the short synthesis of hexahydroquinolin-2(1H)-ones, hexahydro quinolines and tetrahydroquinolinones via ring opening rearrangement and a new oxidative deformylation, respectively.
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Affiliation(s)
- Pratap Kumar Mandal
- Department of Chemistry, Indian Institute of Science Education & Research, Bhopal, Madhya Pradesh, 462066
| | - Sreenivas Katukojvala
- Department of Chemistry, Indian Institute of Science Education & Research, Bhopal, Madhya Pradesh, 462066
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4
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Kanchupalli V, Thorbole LA, Kalepu J, Joseph D, Arshad M, Katukojvala S. Rhodium-Catalyzed Enal Transfer with N-Methoxypyridazinium Salts. Org Lett 2022; 24:3850-3854. [PMID: 35587254 DOI: 10.1021/acs.orglett.2c01424] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Abstract
Herein, we report a simple method for functionalized enals involving enal-transfer reaction of water-soluble N-methoxypyridazinium salts. This open-flask reaction proceeds under mild aqueous basic conditions through [2,3]-sigmatropic rearrangement of propargyl/allyl sulfur-ylides derived from in situ-generated Rh-(E)-enalcarbene. Various synthetically challenging allene- and allyl-functionalized (E)-enals with a γ-C(sp3) quaternary center were obtained in good to high yields. InCl3-catalyzed cascade cyclization of allenyl-enal and aniline gave a valuable pyrrolo[1,2-a]quinoline motif.
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Affiliation(s)
- Vinaykumar Kanchupalli
- Department of Chemistry, Indian Institute of Science Education & Research Bhopal, Bhopal, Madhya Pradesh 462066, India
| | - Laxman Anandrao Thorbole
- Department of Chemistry, Indian Institute of Science Education & Research Bhopal, Bhopal, Madhya Pradesh 462066, India
| | - Jagadeesh Kalepu
- Department of Chemistry, Indian Institute of Science Education & Research Bhopal, Bhopal, Madhya Pradesh 462066, India
| | - Desna Joseph
- Department of Chemistry, Indian Institute of Science Education & Research Bhopal, Bhopal, Madhya Pradesh 462066, India
| | - Mohammad Arshad
- Department of Chemistry, Indian Institute of Science Education & Research Bhopal, Bhopal, Madhya Pradesh 462066, India
| | - Sreenivas Katukojvala
- Department of Chemistry, Indian Institute of Science Education & Research Bhopal, Bhopal, Madhya Pradesh 462066, India
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5
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Feng M, Jiang H, Huang L. Silver-mediated annulation between 5- H-1,2,3-thiadiazoles and 1,3-dicarbonyl compounds to construct polysubstituted furans. Org Chem Front 2022. [DOI: 10.1039/d2qo01224c] [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 synthesis of polysubstituted furans by Ag(i)-mediated annulation between 5-H-1,2,3-thiadiazoles and 1,3-dicarbonyl compounds is reported.
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Affiliation(s)
- Mengxia Feng
- Key Laboratory of Functional Molecular Engineering of Guangdong Province, School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou 510640, P. R. China
| | - Huanfeng Jiang
- Key Laboratory of Functional Molecular Engineering of Guangdong Province, School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou 510640, P. R. China
| | - Liangbin Huang
- Key Laboratory of Functional Molecular Engineering of Guangdong Province, School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou 510640, P. R. China
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6
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Yang Y, Zuo L, Wei K, Guo W. Water-Mediated Catalytic Decarboxylation Enabled Polysubstituted Furans and Allylic Alcohols with Exclusive (E)-Configurations. Org Lett 2021; 23:3195-3200. [DOI: 10.1021/acs.orglett.1c00929] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Yulian Yang
- School of Biology and Biological Engineering, South China University of Technology, Guangzhou 510006, China
- Frontier Institute of Science and Technology (FIST), Xi’an Jiaotong University, Xi’an 710045, China
| | - Linhong Zuo
- Frontier Institute of Science and Technology (FIST), Xi’an Jiaotong University, Xi’an 710045, China
| | - Kun Wei
- School of Biology and Biological Engineering, South China University of Technology, Guangzhou 510006, China
| | - Wusheng Guo
- Frontier Institute of Science and Technology (FIST), Xi’an Jiaotong University, Xi’an 710045, China
- Xi’an Key Laboratory of Sustainable Energy Materials Chemistry, Xi’an Jiaotong University, Xi’an 710049, China
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7
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Sajjad F, Chen Y, Tian X, Dong S, Gopi Krishna Reddy A, Hu W, Xing D. Facile synthesis of 1,4-oxazines by ruthenium-catalyzed tandem N-H insertion/cyclization of α-arylamino ketones and diazo pyruvates. Org Biomol Chem 2021; 19:1769-1772. [PMID: 33538720 DOI: 10.1039/d0ob01913e] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Herein, we report an efficient strategy for the rapid construction of 1,4-oxazines starting from simple α-amino ketones and diazo pyruvates under mild reaction conditions. This transformation is efficiently catalyzed by RuCl3 through a tandem N-H insertion/cyclization sequence via an enol formation. This reaction shows broad functional group tolerance, and the resulting 1,4-oxazine products show promising anticancer activities toward HCT116.
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Affiliation(s)
- Farrukh Sajjad
- Shanghai Engineering Research Center of Molecular Therapeutics and New Drug Development, School of Chemistry and Molecular Engineering, East China Normal University, 3663 North Zhongshan Rd., Shanghai, 200062, China.
| | - Yanmei Chen
- Shanghai Engineering Research Center of Molecular Therapeutics and New Drug Development, School of Chemistry and Molecular Engineering, East China Normal University, 3663 North Zhongshan Rd., Shanghai, 200062, China.
| | - Xue Tian
- A School of Pharmaceutical Sciences, Sun Yat-sen University, Guangzhou, 510006, China.
| | - Suzhen Dong
- Shanghai Engineering Research Center of Molecular Therapeutics and New Drug Development, School of Chemistry and Molecular Engineering, East China Normal University, 3663 North Zhongshan Rd., Shanghai, 200062, China.
| | | | - Wenhao Hu
- Shanghai Engineering Research Center of Molecular Therapeutics and New Drug Development, School of Chemistry and Molecular Engineering, East China Normal University, 3663 North Zhongshan Rd., Shanghai, 200062, China. and A School of Pharmaceutical Sciences, Sun Yat-sen University, Guangzhou, 510006, China.
| | - Dong Xing
- Shanghai Engineering Research Center of Molecular Therapeutics and New Drug Development, School of Chemistry and Molecular Engineering, East China Normal University, 3663 North Zhongshan Rd., Shanghai, 200062, China.
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8
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Zhang L, Chen J, Chen X, Zheng X, Zhou J, Zhong T, Chen Z, Yang YF, Jiang X, She YB, Yu C. Rh(iii)-catalyzed, hydrazine-directed C–H functionalization with 1-alkynylcyclobutanols: a new strategy for 1H-indazoles. Chem Commun (Camb) 2020; 56:7415-7418. [PMID: 32484463 DOI: 10.1039/c9cc08884a] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Rh(iii)-catalyzed coupling of phenylhydrazines with 1-alkynylcyclobutanols was realized through a hydrazine-directed C–H functionalization and [4+1] annulation pathway.
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Affiliation(s)
- Lei Zhang
- College of pharmaceutical sciences
- Zhejiang University of Technology
- Hangzhou 310014
- P. R. China
| | - Junyu Chen
- College of pharmaceutical sciences
- Zhejiang University of Technology
- Hangzhou 310014
- P. R. China
| | - Xiahe Chen
- College of Chemical Engineering
- Zhejiang University of Technology
- Hangzhou
- P. R. China
| | - Xiangyun Zheng
- College of pharmaceutical sciences
- Zhejiang University of Technology
- Hangzhou 310014
- P. R. China
| | - Jian Zhou
- College of pharmaceutical sciences
- Zhejiang University of Technology
- Hangzhou 310014
- P. R. China
| | - Tianshuo Zhong
- College of pharmaceutical sciences
- Zhejiang University of Technology
- Hangzhou 310014
- P. R. China
| | - Zhiwei Chen
- College of pharmaceutical sciences
- Zhejiang University of Technology
- Hangzhou 310014
- P. R. China
| | - Yun-Fang Yang
- College of Chemical Engineering
- Zhejiang University of Technology
- Hangzhou
- P. R. China
| | - Xinpeng Jiang
- College of pharmaceutical sciences
- Zhejiang University of Technology
- Hangzhou 310014
- P. R. China
| | - Yuan-Bin She
- College of Chemical Engineering
- Zhejiang University of Technology
- Hangzhou
- P. R. China
| | - Chuanming Yu
- College of pharmaceutical sciences
- Zhejiang University of Technology
- Hangzhou 310014
- P. R. China
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9
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Zhang L, Liu T, Wang YM, Chen J, Zhao YL. Rhodium-Catalyzed Coupling–Cyclization of Alkenyldiazoacetates with o-Alkenyl Arylisocyanides: A General Route to Carbazoles. Org Lett 2019; 21:2973-2977. [DOI: 10.1021/acs.orglett.9b00307] [Citation(s) in RCA: 27] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Affiliation(s)
- Lu Zhang
- Jilin Province Key Laboratory of Organic Functional Molecular Design & Synthesis, Faculty of Chemistry, Northeast Normal University, Changchun 130024, China
| | - Tao Liu
- Jilin Province Key Laboratory of Organic Functional Molecular Design & Synthesis, Faculty of Chemistry, Northeast Normal University, Changchun 130024, China
| | - Yi-Ming Wang
- Jilin Province Key Laboratory of Organic Functional Molecular Design & Synthesis, Faculty of Chemistry, Northeast Normal University, Changchun 130024, China
| | - Jing Chen
- Jilin Province Key Laboratory of Organic Functional Molecular Design & Synthesis, Faculty of Chemistry, Northeast Normal University, Changchun 130024, China
| | - Yu-Long Zhao
- Jilin Province Key Laboratory of Organic Functional Molecular Design & Synthesis, Faculty of Chemistry, Northeast Normal University, Changchun 130024, China
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