1
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Tali JA, Kumar G, Sharma BK, Rasool Y, Sharma Y, Shankar R. Synthesis and site selective C-H functionalization of imidazo-[1,2- a]pyridines. Org Biomol Chem 2023; 21:7267-7289. [PMID: 37655687 DOI: 10.1039/d3ob00849e] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 09/02/2023]
Abstract
Imidazo[1,2-a]pyridine has attracted much interest in drug development because of its potent medicinal properties, therefore the discovery of novel methods for its synthesis and functionalization continues to be an exciting area of research. Although transition metal catalysis has fuelled the most significant developments, extremely beneficial metal-free approaches have also been identified. Even though pertinent reviews focused on imidazo[1,2-a]pyridine synthesis, properties (physicochemical and medicinal), and functionalization at the C3 position have been published, none of these reviews has focused on the outcomes obtained in the field of global ring functionalization. We wish here to describe a brief synthesis and an overview of all the functionalization reactions at each carbon atom, viz, C2, C3, C5, C6, C7 and C8 of this scaffold, divided into sections based on site-selectivity and the type of functionalization methods used.
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Affiliation(s)
- Javeed Ahmad Tali
- Natural Product and Medicinal Chemistry Division (NPMC), CSIR-Indian Institute of Integrative Medicine, Jammu-180001, India.
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad-201002, India
| | - Gulshan Kumar
- Natural Product and Medicinal Chemistry Division (NPMC), CSIR-Indian Institute of Integrative Medicine, Jammu-180001, India.
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad-201002, India
| | - Bhupesh Kumar Sharma
- Natural Product and Medicinal Chemistry Division (NPMC), CSIR-Indian Institute of Integrative Medicine, Jammu-180001, India.
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad-201002, India
| | - Younis Rasool
- Natural Product and Medicinal Chemistry Division (NPMC), CSIR-Indian Institute of Integrative Medicine, Jammu-180001, India.
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad-201002, India
| | - Yashika Sharma
- Natural Product and Medicinal Chemistry Division (NPMC), CSIR-Indian Institute of Integrative Medicine, Jammu-180001, India.
| | - Ravi Shankar
- Natural Product and Medicinal Chemistry Division (NPMC), CSIR-Indian Institute of Integrative Medicine, Jammu-180001, India.
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad-201002, India
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2
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Meena N, Shinde VN, Sonam, Swami PN, Rangan K, Kumar A. Catalyst-Controlled Regiodivergent Oxidative Annulation of 2-Arylimidazo[1,2- a]pyridines with Cinnamaldehyde Derivatives for Construction of Fused N-Heterocyclic Frameworks. J Org Chem 2023; 88:12902-12913. [PMID: 37672762 DOI: 10.1021/acs.joc.3c00717] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 09/08/2023]
Abstract
Catalyst-dependent regioselective oxidative annulation of 2-arylimidazo[1,2-a]pyridines with cinnamaldehyde derivatives to construct fused N-heterocyclic frameworks has been described. The annulation reaction afforded 5-arylnaphtho[1',2':4,5]imidazo[1,2-a]pyridine-6-carbaldehydes in the presence of [RhCp*Cl2]2 as catalyst while 1,7-diarylimidazo[5,1,2-cd]indolizine-6-carbaldehydes were obtained using Pd(OAc)2 as catalyst. The reaction produced annulated products in good yields and exhibited broad substrate scope and excellent functional group tolerance. The method provides two different isomeric annulated products bearing an aldehyde functionality which can be elaborated into an array of functionalities leading to valuable compounds.
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Affiliation(s)
- Neha Meena
- Department of Chemistry, Birla Institute of Technology and Science Pilani, Pilani Campus, Rajasthan 333031, India
| | - Vikki N Shinde
- Department of Chemistry, Birla Institute of Technology and Science Pilani, Pilani Campus, Rajasthan 333031, India
| | - Sonam
- Department of Chemistry, Birla Institute of Technology and Science Pilani, Pilani Campus, Rajasthan 333031, India
| | - Prakash N Swami
- Department of Chemistry, Birla Institute of Technology and Science Pilani, Pilani Campus, Rajasthan 333031, India
| | - Krishnan Rangan
- Department of Chemistry, Birla Institute of Technology and Science Pilani, Hyderabad Campus, Telangana 500078, India
| | - Anil Kumar
- Department of Chemistry, Birla Institute of Technology and Science Pilani, Pilani Campus, Rajasthan 333031, India
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3
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Singh Chauhan AN, Mali G, Dua G, Samant P, Kumar A, Erande RD. [RhCp*Cl 2] 2-Catalyzed Indole Functionalization: Synthesis of Bioinspired Indole-Fused Polycycles. ACS OMEGA 2023; 8:27894-27919. [PMID: 37576617 PMCID: PMC10413382 DOI: 10.1021/acsomega.3c02510] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/13/2023] [Accepted: 07/11/2023] [Indexed: 08/15/2023]
Abstract
Polycyclic fused indoles are ubiquitous in natural products and pharmaceuticals due to their immense structural diversity and biological inference, making them suitable for charting broader chemical space. Indole-based polycycles continue to be fascinating as well as challenging targets for synthetic fabrication because of their characteristic structural frameworks possessing biologically intriguing compounds of both natural and synthetic origin. As a result, an assortment of new chemical processes and catalytic routes has been established to provide unified access to these skeletons in a very efficient and selective manner. Transition-metal-catalyzed processes, in particular from rhodium(III), are widely used in synthetic endeavors to increase molecular complexity efficiently. In recent years, this has resulted in significant progress in reaching molecular scaffolds with enormous biological activity based on core indole skeletons. Additionally, Rh(III)-catalyzed direct C-H functionalization and benzannulation protocols of indole moieties were one of the most alluring synthetic techniques to generate indole-fused polycyclic molecules efficiently. This review sheds light on recent developments toward synthesizing fused indoles by cascade annulation methods using Rh(III)-[RhCp*Cl2]2-catalyzed pathways, which align with the comprehensive and sophisticated developments in the field of Rh(III)-catalyzed indole functionalization. Here, we looked at a few intriguing cascade-based synthetic designs catalyzed by Rh(III) that produced elaborate frameworks inspired by indole bioactivity. The review also strongly emphasizes mechanistic insights for reaching 1-2, 2-3, and 3-4-fused indole systems, focusing on Rh(III)-catalyzed routes. With an emphasis on synthetic efficiency and product diversity, synthetic methods of chosen polycyclic carbocycles and heterocycles with at least three fused, bridged, or spiro cages are reviewed. The newly created synthesis concepts or toolkits for accessing diazepine, indol-ones, carbazoles, and benzo-indoles, as well as illustrative privileged synthetic techniques, are included in the featured collection.
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Affiliation(s)
| | - Ghanshyam Mali
- Department
of Chemistry, Indian Institute of Technology
Jodhpur, Jodhpur 342037, India
| | - Garima Dua
- Department
of Chemistry, Indian Institute of Technology
Jodhpur, Jodhpur 342037, India
| | - Priya Samant
- Department
of Chemistry, Indian Institute of Technology
Jodhpur, Jodhpur 342037, India
| | - Akhilesh Kumar
- Department
of Chemistry and Nano Science, Ewha Womans
University, Seoul 03760, Korea
| | - Rohan D. Erande
- Department
of Chemistry, Indian Institute of Technology
Jodhpur, Jodhpur 342037, India
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4
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Nagesh K, Manda J, Sridhar B, Subba Reddy BV. Rh(III)-catalyzed [3 + 2] spiroannulation of 2,3-dihydro-1,4-benzoxazines with 4-hydroxy-2-alkynoates through ortho-C-H bond functionalization. Org Biomol Chem 2023. [PMID: 37464919 DOI: 10.1039/d3ob00786c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/20/2023]
Abstract
Rhodium(III)-catalyzed [3 + 2]-spiroannulation of 2-aryl-1,4-benzoxazines with 4-hydroxy-2-alkynoates has been developed for the synthesis of highly rigid spirolactones in good yields with high regioselectivity. The reaction proceeds through a cascade of C-H activation followed by C-H annulation and lactonization. In this approach, two C-C and C-O bonds are formed in a single step. This is the first report on the spiroannulation of 2,3-dihydro-1,4-benzoxazines with 4-hydroxy-2-alkynoates.
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Affiliation(s)
- Kommu Nagesh
- Fluoro-Agrochemicals, CSIR-Indian Institute of Chemical Technology, Hyderabad, 500007, India.
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad-201002, India
| | - Jagadish Manda
- Fluoro-Agrochemicals, CSIR-Indian Institute of Chemical Technology, Hyderabad, 500007, India.
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad-201002, India
| | - B Sridhar
- Laboratory of X-ray Crystallography, CSIR-Indian Institute of Chemical Technology, Hyderabad, 500007, India
| | - B V Subba Reddy
- Fluoro-Agrochemicals, CSIR-Indian Institute of Chemical Technology, Hyderabad, 500007, India.
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad-201002, India
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5
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Yogananda Chary D, Soumya Reddy M, Ajay C, Sridhar B, V Subba Reddy B. Ir(III)-Catalyzed Dual C-H Activation of 2-Aryl Phthalazinediones and 3-Aryl-2 H-benzo[ e][1,2,4]thiadiazine-1,1-dioxides for the Construction of Spiro-Fused Cyclic Frameworks. J Org Chem 2023. [PMID: 36802537 DOI: 10.1021/acs.joc.2c02333] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/23/2023]
Abstract
An Ir(III)-catalyzed double C-H activation strategy has been developed for the synthesis of highly rigid spiro frameworks by means of ortho-functionalization of 2-aryl phthalazinediones and 2,3-diphenylcycloprop-2-en-1-ones using the Ir(III)/AgSbF6 catalytic system. Similarly, 3-aryl-2H-benzo[e][1,2,4]thiadiazine-1,1-dioxides undergo smooth cyclization with 2,3-diphenylcycloprop-2-en-1-ones to afford a diverse range of spiro compounds in good yields with excellent selectivity. Additionally, 2-arylindazoles provide the corresponding chalcone derivatives under similar reaction conditions.
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Affiliation(s)
- Devulapally Yogananda Chary
- Fluoro-Agrochemicals, CSIR-Indian Institute of Chemical Technology, Hyderabad 500007, India.,Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, UP 201002, India
| | - Minpoor Soumya Reddy
- Fluoro-Agrochemicals, CSIR-Indian Institute of Chemical Technology, Hyderabad 500007, India
| | - Chidrawar Ajay
- Fluoro-Agrochemicals, CSIR-Indian Institute of Chemical Technology, Hyderabad 500007, India.,Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, UP 201002, India
| | - Balasubramanian Sridhar
- Laboratory of X-ray Crystallography, CSIR-Indian Institute of Chemical Technology, Hyderabad 500007, India
| | - Basi V Subba Reddy
- Fluoro-Agrochemicals, CSIR-Indian Institute of Chemical Technology, Hyderabad 500007, India
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6
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Singh D, Pramanik S, Maity S. Photocatalytic sequential C-H functionalization expediting acetoxymalonylation of imidazo heterocycles. Beilstein J Org Chem 2023; 19:666-673. [PMID: 37205129 PMCID: PMC10186259 DOI: 10.3762/bjoc.19.48] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2023] [Accepted: 05/09/2023] [Indexed: 05/21/2023] Open
Abstract
The importance of functionalized imidazo heterocycles has often been featured in several impactful research both from academia and industry. Herein, we report a direct C-3 acetoxymalonylation of imidazo heterocycles using relay C-H functionalization enabled by organophotocatalysis starring zinc acetate in the triple role of an activator, ion scavenger as well as an acetylating reagent. The mechanistic investigation revealed a sequential sp2 and sp3 C-H activation, followed by functionalization driven by zinc acetate coupled with the photocatalyst PTH. A variety of imidazo[1,2-a]pyridines and related heterocycles were explored as substrates along with several active methylene reagents, all generating the products with excellent yields and regioselectivity, thus confirming excellent functional group tolerability.
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Affiliation(s)
- Deepak Singh
- Department of Chemistry and Chemical Biology, Indian Institute of Technology (ISM) Dhanbad, JH 826004, India
| | - Shyamal Pramanik
- Department of Chemistry and Chemical Biology, Indian Institute of Technology (ISM) Dhanbad, JH 826004, India
| | - Soumitra Maity
- Department of Chemistry and Chemical Biology, Indian Institute of Technology (ISM) Dhanbad, JH 826004, India
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7
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Ruthenium (II) catalysed regioselective C-2ʹ-alkenylation of 2-phenylimidazo[1,2-a]pyridine-3-carbaldehydes. Tetrahedron 2022. [DOI: 10.1016/j.tet.2022.132956] [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]
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8
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Solvent-controlled photosensitized divergent C3-ethoxycarbonylmethylation/hydroxyalkylation of imidazo[1,2-a]pyridines with diethyl bromomalonate. Tetrahedron 2022. [DOI: 10.1016/j.tet.2022.132988] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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9
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Mishra DR, Panda BS, Nayak S, Panda J, Mohapatra S. Recent Advances in the Synthesis of 5‐Membered
N
‐Heterocycles via Rhodium Catalysed Cascade Reactions. ChemistrySelect 2022. [DOI: 10.1002/slct.202200531] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Affiliation(s)
- Deepak R. Mishra
- Organic Synthesis Laboratory Department of Chemistry Ravenshaw University Cuttack 753003 Odisha India
| | - Bhabani S. Panda
- Organic Synthesis Laboratory Department of Chemistry Ravenshaw University Cuttack 753003 Odisha India
| | - Sabita Nayak
- Organic Synthesis Laboratory Department of Chemistry Ravenshaw University Cuttack 753003 Odisha India
| | - Jasmine Panda
- Organic Synthesis Laboratory Department of Chemistry Ravenshaw University Cuttack 753003 Odisha India
| | - Seetaram Mohapatra
- Organic Synthesis Laboratory Department of Chemistry Ravenshaw University Cuttack 753003 Odisha India
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10
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Thavaselvan S, Parthasarathy K. Nickel-catalyzed [2 + 2 + 2] benzannulation of alkynes: a new route to the synthesis of highly substituted naphthalenes. Org Biomol Chem 2022; 20:4309-4313. [PMID: 35583045 DOI: 10.1039/d2ob00513a] [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
The Ni(II)-catalyzed aromatic homologation of various directing groups with alkynes to afford highly substituted naphthalene products via C-X bond cleavage followed by alkyne insertion and C-H activation is described. This reaction proceeded with a wide range of directing groups such as pyrazoles, imidazopyridines, benzoimidazothiazoles, thiazoles and triazoles with alkynes to afford highly substituted naphthalenes in moderate to good yields. This transformation is promoted by a simple, straightforward combination of a Ni(II)-complex, Zn dust and a base.
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Affiliation(s)
- Sampath Thavaselvan
- Department of Organic Chemistry, University of Madras, Guindy Campus, Chennai-600 025, Tamil Nadu, India.
| | - Kanniyappan Parthasarathy
- Department of Organic Chemistry, University of Madras, Guindy Campus, Chennai-600 025, Tamil Nadu, India.
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11
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Chidrawar A, Devulapally YC, Balasubramanian S, Basireddy VSR. Rh(III)‐Catalyzed Oxidative Annulation of 2‐Arylindazoles with β‐Ketosulfoxonium Ylides. ChemistrySelect 2021. [DOI: 10.1002/slct.202102982] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Ajay Chidrawar
- Fluoro &Agrochemicals CSIR-Indian Institute of Chemical Technology Hyderabad 500 007 India
- Academy of Scientific and Innovative Research (AcSIR) Ghaziabad 201002 Uttar Pradesh India
| | - Yogananda Chary Devulapally
- Fluoro &Agrochemicals CSIR-Indian Institute of Chemical Technology Hyderabad 500 007 India
- Academy of Scientific and Innovative Research (AcSIR) Ghaziabad 201002 Uttar Pradesh India
| | - Sridhar Balasubramanian
- Laboratory of X-ray Crystallography CSIR-Indian Institute of Chemical Technology Hyderabad 500 007 India
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12
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Yogananda Chary D, Aashritha K, Sridhar B, Subba Reddy BV. Rh(III)-catalyzed ortho-C–H bond functionalization of 2-arylquinoxalines with vinyl arenes. Tetrahedron Lett 2021. [DOI: 10.1016/j.tetlet.2021.153501] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
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13
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Ghosh S, Laru S, Hajra A. Ortho C-H Functionalization of 2-Arylimidazo[1,2-a]pyridines. CHEM REC 2021; 22:e202100240. [PMID: 34757691 DOI: 10.1002/tcr.202100240] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2021] [Revised: 10/19/2021] [Accepted: 10/25/2021] [Indexed: 11/09/2022]
Abstract
C-H activation and functionalization is quite promising in recent days as the strategy offers a go-to general method for different bond formations and hence grants synthetic versatility. At the same time, imidazopyridine, a fused bicycle of imidazole moiety with pyridine ring, has a profound impact due to its ubiquitous and prodigious application in medicinal as well as material chemistry. The presence of N-1 atom in 2-arylImidazo[1,2-a]pyridine facilitates the coordination with metal catalysts leading to the formation of ortho-substituted products. This review summarizes all the articles on ortho C-H functionalization of 2-arylImidazo[1,2-a]pyridines published till August 2021.
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Affiliation(s)
- Sumit Ghosh
- Department of Chemistry, Visva-Bharati (A Central University), Santiniketan, 731235, India
| | - Sudip Laru
- Department of Chemistry, Visva-Bharati (A Central University), Santiniketan, 731235, India
| | - Alakananda Hajra
- Department of Chemistry, Visva-Bharati (A Central University), Santiniketan, 731235, India
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14
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Wu Z, Zhang R, Gu Q, You S. SCpRh(III)‐Catalyzed Enantioselective Aryl C−H Addition to Nitroalkenes. ASIAN J ORG CHEM 2021. [DOI: 10.1002/ajoc.202100299] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Affiliation(s)
- Zhi‐Jie Wu
- State Key Laboratory of Organometallic Chemistry Shanghai Institute of Organic Chemistry Chinese Academy of Sciences 345 Lingling Lu Shanghai 200032 P. R. China
- School of Physical Science and Technology ShanghaiTech University 100 Haike Road Shanghai 201210 P. R. China
| | - Ru Zhang
- State Key Laboratory of Organometallic Chemistry Shanghai Institute of Organic Chemistry Chinese Academy of Sciences 345 Lingling Lu Shanghai 200032 P. R. China
| | - Qing Gu
- State Key Laboratory of Organometallic Chemistry Shanghai Institute of Organic Chemistry Chinese Academy of Sciences 345 Lingling Lu Shanghai 200032 P. R. China
| | - Shu‐Li You
- State Key Laboratory of Organometallic Chemistry Shanghai Institute of Organic Chemistry Chinese Academy of Sciences 345 Lingling Lu Shanghai 200032 P. R. China
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15
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Chary Devulapally Y, Ittamalla C, Balasubramanian S, Venkata Subba Reddy B. Rhodium(III)‐Catalyzed Dehydrogenative Annulation of 2‐Arylindazoles with Cyclic Enones. European J Org Chem 2021. [DOI: 10.1002/ejoc.202100272] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Yogananda Chary Devulapally
- Fluoro &Agrochemicals CSIR-Indian Institute of Chemical Technology Hyderabad 500 007 India
- Academy of Scientific and Innovative Research (AcSIR) Ghaziabad 201002, Uttar Pradesh India
| | - Chaitanya Ittamalla
- Fluoro &Agrochemicals CSIR-Indian Institute of Chemical Technology Hyderabad 500 007 India
- Academy of Scientific and Innovative Research (AcSIR) Ghaziabad 201002, Uttar Pradesh India
| | - S. Balasubramanian
- Laboratory of X-ray Crystallography CSIR-Indian Institute of Chemical Technology Hyderabad 500 007 India
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16
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Yogananda Chary D, Nagarjuna Reddy K, Sridhar B, Subba Reddy B. Ru(II) catalyzed dehydrogenative annulation of 2-arylimidazo[1,2-a]pyridines with maleimides. Tetrahedron Lett 2021. [DOI: 10.1016/j.tetlet.2021.152830] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
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17
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Tsuchimoto T, Johshita T, Sambai K, Saegusa N, Hayashi T, Tani T, Osano M. In(ONf) 3-catalyzed 7-membered carbon-ring-forming annulation of heteroarylindoles with α,β-unsaturated carbonyl compounds. Org Chem Front 2021. [DOI: 10.1039/d1qo00050k] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
We developed the two recipes, on the indium-catalyzed reductive and oxidative 7-membered carbon-ring-forming annulations of heteroarylindoles with a,β-unsaturated carbonyl compounds.
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Affiliation(s)
- Teruhisa Tsuchimoto
- Department of Applied Chemistry
- School of Science and Technology
- Meiji University
- Tama-ku
- Japan
| | - Takahiro Johshita
- Department of Applied Chemistry
- School of Science and Technology
- Meiji University
- Tama-ku
- Japan
| | - Kazuhiro Sambai
- Department of Applied Chemistry
- School of Science and Technology
- Meiji University
- Tama-ku
- Japan
| | - Naoki Saegusa
- Department of Applied Chemistry
- School of Science and Technology
- Meiji University
- Tama-ku
- Japan
| | - Takumi Hayashi
- Department of Applied Chemistry
- School of Science and Technology
- Meiji University
- Tama-ku
- Japan
| | - Tomohiro Tani
- Department of Applied Chemistry
- School of Science and Technology
- Meiji University
- Tama-ku
- Japan
| | - Mana Osano
- Department of Applied Chemistry
- School of Science and Technology
- Meiji University
- Tama-ku
- Japan
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18
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Liu S, Jiang H, Liu W, Zhu X, Hao XQ, Song MP. Ruthenium-Catalyzed C(sp 2)-H Bond Bisallylation with Imidazopyridines as Directing Groups. J Org Chem 2020; 85:15167-15182. [PMID: 33140953 DOI: 10.1021/acs.joc.0c02029] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
A Ru(II)-catalyzed bisallylation of imidazopyridines with vinylcyclopropanes or vinyl cyclic carbonate has been successfully realized. Notably, pharmacophore imidazopyridine was utilized as an intrinsic directing group, which gave access to value-added bisallylated products in high yields via double tandem C-H and C-C/C-O activation. The current methodology was featured with broad substrate scope, good functional group compatibility, and operational simplicity.
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Affiliation(s)
- Shuang Liu
- College of Chemistry, Zhengzhou University, No. 100 of Science Road, Zhengzhou, Henan 450001, P. R. China
| | - Hui Jiang
- College of Chemistry, Zhengzhou University, No. 100 of Science Road, Zhengzhou, Henan 450001, P. R. China
| | - Wannian Liu
- College of Chemistry, Zhengzhou University, No. 100 of Science Road, Zhengzhou, Henan 450001, P. R. China
| | - Xinju Zhu
- College of Chemistry, Zhengzhou University, No. 100 of Science Road, Zhengzhou, Henan 450001, P. R. China
| | - Xin-Qi Hao
- College of Chemistry, Zhengzhou University, No. 100 of Science Road, Zhengzhou, Henan 450001, P. R. China
| | - Mao-Ping Song
- College of Chemistry, Zhengzhou University, No. 100 of Science Road, Zhengzhou, Henan 450001, P. R. China
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19
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Shinde VN, Kanchan Roy T, Jaspal S, Nipate DS, Meena N, Rangan K, Kumar D, Kumar A. Rhodium(III)‐Catalyzed Annulation of 2‐Arylimidazo[1,2‐
a
]pyridines with Maleimides: Synthesis of 1
H
‐Benzo[
e
]pyrido[1′,2′:1,2]imidazo[4,5‐
g
]isoindole‐1,3(2
H
)‐Diones and their Photophysical Studies. Adv Synth Catal 2020. [DOI: 10.1002/adsc.202000960] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Affiliation(s)
- Vikki N. Shinde
- Department of Chemistry Birla Institute of Technology and Science Pilani, Pilani Campus Pilani Rajasthan 333031 India
| | - Tapta Kanchan Roy
- Department of Chemistry and Chemical Sciences Central University of Jammu Rahya Suchani J&K 181143 India
| | - Sonam Jaspal
- Department of Chemistry Birla Institute of Technology and Science Pilani, Pilani Campus Pilani Rajasthan 333031 India
| | - Dhananjay S. Nipate
- Department of Chemistry Birla Institute of Technology and Science Pilani, Pilani Campus Pilani Rajasthan 333031 India
| | - Neha Meena
- Department of Chemistry Birla Institute of Technology and Science Pilani, Pilani Campus Pilani Rajasthan 333031 India
| | - Krishnan Rangan
- Department of Chemistry Birla Institute of Technology and Science Pilani, Hyderbad Campus Hyderabad Telangana 500078 India
| | - Dalip Kumar
- Department of Chemistry Birla Institute of Technology and Science Pilani, Pilani Campus Pilani Rajasthan 333031 India
| | - Anil Kumar
- Department of Chemistry Birla Institute of Technology and Science Pilani, Pilani Campus Pilani Rajasthan 333031 India
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20
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Rao MK, Reddy KN, Sridhar B, Reddy BS. ortho-Alkylation of 2-arylindazoles with α-diazocarbonyl compounds. Tetrahedron Lett 2020. [DOI: 10.1016/j.tetlet.2020.152252] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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21
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Guo S, Liu Y, Wang Y, Zhang X, Fan X. Construction of Bridged Carbocycles and Heterocycles via Rh(III)-Catalyzed C-H Alkylation/Michael Addition of 2-Arylindoles with Quinone Monoacetals. J Org Chem 2020; 85:8910-8922. [PMID: 32539389 DOI: 10.1021/acs.joc.0c00774] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
A rhodium-catalyzed formal [4 + 5] annulation reaction of 2-arylindoles with quinone monoacetals for the selective preparation of bridged nine-membered carbocyclic and heterocyclic compounds is developed. When 2-aryl substituted indoles are employed, this annulation reaction affords bridged nine-membered carbocyclic compounds with excellent indolyl C3 selectivity. On the other hand, with 2-aryl-3-substituted indoles as the substrates, bridged nine-membered heterocyclic compounds are exclusively formed via N1 annulation. Further transformations of the obtained products into new bridged compounds showcase the synthetic potential of this protocol.
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Affiliation(s)
- Shenghai Guo
- Henan Key Laboratory of Organic Functional Molecules and Drug Innovation, Collaborative Innovation Center of Henan Province for Green Manufacturing of Fine Chemicals, Key Laboratory of Green Chemical Media and Reactions, Ministry of Education, School of Chemistry and Chemical Engineering, Henan Normal University, Xinxiang, Henan 453007, P. R. China
| | - Yangfan Liu
- Henan Key Laboratory of Organic Functional Molecules and Drug Innovation, Collaborative Innovation Center of Henan Province for Green Manufacturing of Fine Chemicals, Key Laboratory of Green Chemical Media and Reactions, Ministry of Education, School of Chemistry and Chemical Engineering, Henan Normal University, Xinxiang, Henan 453007, P. R. China
| | - Yaping Wang
- Henan Key Laboratory of Organic Functional Molecules and Drug Innovation, Collaborative Innovation Center of Henan Province for Green Manufacturing of Fine Chemicals, Key Laboratory of Green Chemical Media and Reactions, Ministry of Education, School of Chemistry and Chemical Engineering, Henan Normal University, Xinxiang, Henan 453007, P. R. China
| | - Xinying Zhang
- Henan Key Laboratory of Organic Functional Molecules and Drug Innovation, Collaborative Innovation Center of Henan Province for Green Manufacturing of Fine Chemicals, Key Laboratory of Green Chemical Media and Reactions, Ministry of Education, School of Chemistry and Chemical Engineering, Henan Normal University, Xinxiang, Henan 453007, P. R. China
| | - Xuesen Fan
- Henan Key Laboratory of Organic Functional Molecules and Drug Innovation, Collaborative Innovation Center of Henan Province for Green Manufacturing of Fine Chemicals, Key Laboratory of Green Chemical Media and Reactions, Ministry of Education, School of Chemistry and Chemical Engineering, Henan Normal University, Xinxiang, Henan 453007, P. R. China
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22
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Zheng G, Duan X, Chen L, Sun J, Zhai S, Li X, Jing J, Li X. Access to [4,3,1]-Bridged Carbocycles via Rhodium(III)-Catalyzed C-H Activation of 2-Arylindoles and Annulation with Quinone Monoacetals. J Org Chem 2020; 85:4543-4552. [PMID: 32068406 DOI: 10.1021/acs.joc.0c00018] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
Reported herein is the Rh(III)-catalyzed annulation of N-unprotected 2-arylindoles with quinone monoacetals for the straightforward synthesis of [4,3,1]-bridged carbocycles with exclusive C(3) selectivity. Mechanistic studies, particularly deuterium-labeling experiments, suggest that the coupling likely proceeds via two-fold C-H activation with two-fold migratory insertion into the enone moieties.
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Affiliation(s)
- Guangfan Zheng
- Key Laboratory of Applied Surface and Colloid Chemistry of MOE, School of Chemistry and Chemical Engineering Shaanxi Normal University (SNNU), Xi'an 710062, China
| | - Xujing Duan
- Key Laboratory of Applied Surface and Colloid Chemistry of MOE, School of Chemistry and Chemical Engineering Shaanxi Normal University (SNNU), Xi'an 710062, China
| | - Lu Chen
- Key Laboratory of Applied Surface and Colloid Chemistry of MOE, School of Chemistry and Chemical Engineering Shaanxi Normal University (SNNU), Xi'an 710062, China
| | - Jiaqiong Sun
- Key Laboratory of Applied Surface and Colloid Chemistry of MOE, School of Chemistry and Chemical Engineering Shaanxi Normal University (SNNU), Xi'an 710062, China
| | - Shuailei Zhai
- Key Laboratory of Applied Surface and Colloid Chemistry of MOE, School of Chemistry and Chemical Engineering Shaanxi Normal University (SNNU), Xi'an 710062, China
| | - Xiaojiao Li
- Key Laboratory of Applied Surface and Colloid Chemistry of MOE, School of Chemistry and Chemical Engineering Shaanxi Normal University (SNNU), Xi'an 710062, China
| | - Jierui Jing
- Key Laboratory of Applied Surface and Colloid Chemistry of MOE, School of Chemistry and Chemical Engineering Shaanxi Normal University (SNNU), Xi'an 710062, China
| | - Xingwei Li
- Key Laboratory of Applied Surface and Colloid Chemistry of MOE, School of Chemistry and Chemical Engineering Shaanxi Normal University (SNNU), Xi'an 710062, China
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23
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Li B, Shen N, Yang Y, Zhang X, Fan X. Synthesis of naphtho[1′,2′:4,5]imidazo[1,2-a]pyridines via Rh(iii)-catalyzed C–H functionalization of 2-arylimidazo[1,2-a]pyridines with cyclic 2-diazo-1,3-diketones featuring with a ring opening and reannulation. Org Chem Front 2020. [DOI: 10.1039/d0qo00073f] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
An unprecedented synthesis of functionalized naphtho[1′,2′:4,5]imidazo[1,2-a]pyridines via rhodium-catalyzed cascade reactions of 2-arylimidazo[1,2-a]pyridine-3-carbaldehydes with cyclic α-diazo-1,3-diketones is presented.
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Affiliation(s)
- Bin Li
- School of Environment
- School of Chemistry and Chemical Engineering
- Henan Key Laboratory of Organic Functional Molecules and Drug Innovation
- Key Laboratory of Green Chemical Media and Reactions
- Ministry of Education
| | - Nana Shen
- School of Environment
- School of Chemistry and Chemical Engineering
- Henan Key Laboratory of Organic Functional Molecules and Drug Innovation
- Key Laboratory of Green Chemical Media and Reactions
- Ministry of Education
| | - Yujie Yang
- School of Environment
- School of Chemistry and Chemical Engineering
- Henan Key Laboratory of Organic Functional Molecules and Drug Innovation
- Key Laboratory of Green Chemical Media and Reactions
- Ministry of Education
| | - Xinying Zhang
- School of Environment
- School of Chemistry and Chemical Engineering
- Henan Key Laboratory of Organic Functional Molecules and Drug Innovation
- Key Laboratory of Green Chemical Media and Reactions
- Ministry of Education
| | - Xuesen Fan
- School of Environment
- School of Chemistry and Chemical Engineering
- Henan Key Laboratory of Organic Functional Molecules and Drug Innovation
- Key Laboratory of Green Chemical Media and Reactions
- Ministry of Education
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