1
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Dhami A, Chandrasekharan SP, Mohanan K. Direct Access to Trifluoromethylated Benzo[ d]oxepines from o-Alkynylaryl Aldehydes and Trifluorodiazoethane. Org Lett 2023; 25:3018-3022. [PMID: 37092874 DOI: 10.1021/acs.orglett.3c00801] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/25/2023]
Abstract
Reported in this Letter is a silver-catalyzed reaction between o-alkynylaryl aldehydes and trifluorodiazoethane that enables an expedient synthesis of trifluoromethylated benzo[d]oxepines. The reaction works through a silver-promoted 6-endo-dig cyclization of o-alkynylbenzaldehydes for the generation of an isochromenylium intermediate, which upon a ring-expansive addition of trifluorodiazoethane delivers a novel class of trifluoromethylated benzoxepine frameworks. This strategy was applied to the synthesis of phosphonylated benzo[d]oxepines using the Seyferth-Gilbert reagent.
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Affiliation(s)
- Anamika Dhami
- Medicinal and Process Chemistry Division, Central Drug Research Institute (CSIR), BS-10/1, Sector 10, Jankipuram Extension, Sitapur Road, P.O. Box 173, Lucknow, Uttar Pradesh 226031, India
| | - Sanoop P Chandrasekharan
- Medicinal and Process Chemistry Division, Central Drug Research Institute (CSIR), BS-10/1, Sector 10, Jankipuram Extension, Sitapur Road, P.O. Box 173, Lucknow, Uttar Pradesh 226031, India
| | - Kishor Mohanan
- Medicinal and Process Chemistry Division, Central Drug Research Institute (CSIR), BS-10/1, Sector 10, Jankipuram Extension, Sitapur Road, P.O. Box 173, Lucknow, Uttar Pradesh 226031, India
- Academy of Scientific and Innovative Research, Ghaziabad, Uttar Pradesh 201002, India
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2
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Yang T, Jiang Q, Wang CM, Li SL, He CY, Chu WD, Liu QZ. Cyclization of Vinyl Diazo Compounds with Benzofuran-Derived Azadienes Enabled by NaBAr F4. Org Lett 2023; 25:2243-2247. [PMID: 36971358 DOI: 10.1021/acs.orglett.3c00493] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/29/2023]
Abstract
An unprecedented cycloaddition of vinyl diazo compounds with benzofuran-derived azadienes catalyzed by rarely independently used NaBArF4 has been established. Benzofuran-fused hydropyridines were constructed with excellent yields and high diastereoselectivity via a Na+-catalyzed inverse-electron-demand aza-Diels-Alder reaction. Notably, this transformation also features good compatibility with a one-pot protocol to deliver the spiro[benzofuran-cyclopentene] skeleton, as well as perfect atom economy and simple reaction conditions.
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3
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Tanpure SD, Kardile RD, Liu RS. Relay Zn( ii)- and Au( i)-catalyzed aziridination/cyclization/ring expansion sequence to form 3-benzazepine derivatives. Org Chem Front 2023. [DOI: 10.1039/d3qo00134b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/03/2023]
Abstract
The synthesis of 3H-benzo[d]azepine-2-carboxylates from 2-alkynylphenyl aldimines and α-diazo esters using Zn(ii) and Au(i) catalysts is described.
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4
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Zheng H, Wang K, De Angelis L, Arman HD, Doyle MP. Brønsted Acid Catalyzed Oxocarbenium-Olefin Metathesis/Rearrangements of 1 H-Isochromene Acetals with Vinyl Diazo Compounds. J Am Chem Soc 2021; 143:15391-15399. [PMID: 34510888 DOI: 10.1021/jacs.1c07271] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
An oxocarbenium-olefin cross metathesis occurs during Brønsted acid catalyzed reactions of 1H-isochromene acetals with vinyl diazo compounds. Formally a carbonyl-alkene [2 + 2]-cyclization between isobenzopyrylium ions and the vinyl group of vinyl diazoesters, the retro-[2 + 2] cycloaddition produces a tethered alkene and a vinyl diazonium ion that, upon loss of dinitrogen, undergoes a highly selective carbocationic cascade rearrangements to diverse products whose formation is controlled by reactant substituents. Polysubstituted benzobicyclo[3.3.1]oxocines, benzobicyclo[3.2.2]oxepines, benzobicyclopropane, and naphthalenes are obtained in good to excellent yields and selectivities. Furthermore, isotopic tracer and control experiments shed light on the oxocarbenium-olefin metathesis/rearrangement process as well as on the origin of the interesting substituent-dependent selectivity.
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Affiliation(s)
| | | | | | | | - Michael P Doyle
- Department of Chemistry, The University of Texas at San Antonio, San Antonio, Texas 78249, United States
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5
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Liu S, Qian H, Zhang T, Xie H, Han Z, Guo W, Huang H, Sun J. Mild Intermolecular Synthesis of a Cyclopropane‐Containing Tricyclic Skeleton: Unusual Reactivity of Isobenzopyryliums. Angew Chem Int Ed Engl 2021. [DOI: 10.1002/ange.202108258] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Shuxuan Liu
- Jiangsu Key Laboratory of Advanced Catalytic Materials & Technology School of Petrochemical Engineering Changzhou University Changzhou China
| | - Hui Qian
- Department of Chemistry The Hong Kong University of Science and Technology Clear Water Bay Kowloon Hong Kong SAR China
| | - Tianyu Zhang
- Jiangsu Key Laboratory of Advanced Catalytic Materials & Technology School of Petrochemical Engineering Changzhou University Changzhou China
| | - Hongling Xie
- Jiangsu Key Laboratory of Advanced Catalytic Materials & Technology School of Petrochemical Engineering Changzhou University Changzhou China
| | - Zhengyu Han
- Jiangsu Key Laboratory of Advanced Catalytic Materials & Technology School of Petrochemical Engineering Changzhou University Changzhou China
| | - Wengang Guo
- Jiangsu Key Laboratory of Advanced Catalytic Materials & Technology School of Petrochemical Engineering Changzhou University Changzhou China
| | - Hai Huang
- Jiangsu Key Laboratory of Advanced Catalytic Materials & Technology School of Petrochemical Engineering Changzhou University Changzhou China
| | - Jianwei Sun
- Jiangsu Key Laboratory of Advanced Catalytic Materials & Technology School of Petrochemical Engineering Changzhou University Changzhou China
- Department of Chemistry The Hong Kong University of Science and Technology Clear Water Bay Kowloon Hong Kong SAR China
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6
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Liu S, Qian H, Zhang T, Xie H, Han Z, Guo W, Huang H, Sun J. Mild Intermolecular Synthesis of a Cyclopropane-Containing Tricyclic Skeleton: Unusual Reactivity of Isobenzopyryliums. Angew Chem Int Ed Engl 2021; 60:21272-21276. [PMID: 34342934 DOI: 10.1002/anie.202108258] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2021] [Revised: 08/02/2021] [Indexed: 11/05/2022]
Abstract
Cyclopropanes embedded in a polycyclic bridged architecture are a versatile structural motif, but such complex frameworks often impose substantial synthetic challenges. Herein we introduce a new approach for the expedient access to such spring-loaded strained systems via an exceptionally mild intermolecular convergent process between the readily available isobenzopyryliums and vinyl boronic acids. Different from the typical conventional approaches, our protocol does not involve the highly active carbenoid intermediates or strong conditions in order to overcome the disfavored kinetic and thermodynamic problems. Instead, the key cyclopropane ring was formed between the well-positioned nucleophile and electrophile in the adduct from the regioselective [4+2] cycloaddition. Thus, this unusual process also represents a new reactivity of the versatile isobenzopyryliums. The choice of a Brønsted acid catalyst with proper acidity is crucial to the high efficiency and selectivity for this multiple bond-forming process. The strained products are precursors to other useful synthetic building blocks.
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Affiliation(s)
- Shuxuan Liu
- Jiangsu Key Laboratory of Advanced Catalytic Materials & Technology, School of Petrochemical Engineering, Changzhou University, Changzhou, China
| | - Hui Qian
- Department of Chemistry, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong SAR, China
| | - Tianyu Zhang
- Jiangsu Key Laboratory of Advanced Catalytic Materials & Technology, School of Petrochemical Engineering, Changzhou University, Changzhou, China
| | - Hongling Xie
- Jiangsu Key Laboratory of Advanced Catalytic Materials & Technology, School of Petrochemical Engineering, Changzhou University, Changzhou, China
| | - Zhengyu Han
- Jiangsu Key Laboratory of Advanced Catalytic Materials & Technology, School of Petrochemical Engineering, Changzhou University, Changzhou, China
| | - Wengang Guo
- Jiangsu Key Laboratory of Advanced Catalytic Materials & Technology, School of Petrochemical Engineering, Changzhou University, Changzhou, China
| | - Hai Huang
- Jiangsu Key Laboratory of Advanced Catalytic Materials & Technology, School of Petrochemical Engineering, Changzhou University, Changzhou, China
| | - Jianwei Sun
- Jiangsu Key Laboratory of Advanced Catalytic Materials & Technology, School of Petrochemical Engineering, Changzhou University, Changzhou, China.,Department of Chemistry, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong SAR, China
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7
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Zheng H, Wang K, Faghihi I, Griffith WP, Arman H, Doyle MP. Diverse Reactions of Vinyl Diazo Compounds with Quinone Oxonium Ions, Quinone Imine Ketals, and Eschenmoser’s Salt. ACS Catal 2021. [DOI: 10.1021/acscatal.1c02674] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Affiliation(s)
- Haifeng Zheng
- Department of Chemistry, The University of Texas at San Antonio, One UTSA Circle, San Antonio, Texas 78249, United States
| | - Kan Wang
- Department of Chemistry, The University of Texas at San Antonio, One UTSA Circle, San Antonio, Texas 78249, United States
| | - Isa Faghihi
- Department of Chemistry, The University of Texas at San Antonio, One UTSA Circle, San Antonio, Texas 78249, United States
| | - Wendell P. Griffith
- Department of Chemistry, The University of Texas at San Antonio, One UTSA Circle, San Antonio, Texas 78249, United States
| | - Hadi Arman
- Department of Chemistry, The University of Texas at San Antonio, One UTSA Circle, San Antonio, Texas 78249, United States
| | - Michael P. Doyle
- Department of Chemistry, The University of Texas at San Antonio, One UTSA Circle, San Antonio, Texas 78249, United States
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8
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Li W, Zhou L. Vinyldiazo Compounds as 3-Carbon Radical Acceptors: Synthesis of 4-Fluoroacridines via Visible-Light-Promoted Cascade Radical Cyclization. Org Lett 2021; 23:4279-4283. [PMID: 34029108 DOI: 10.1021/acs.orglett.1c01204] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
Vinyldiazo reagents were developed as the radical acceptors in a visible-light-promoted sequential radical cyclization reaction, providing a mechanistically distinct pathway to achieve (3 + 3) cyclization. Using N-aryl chlorodifluoromethyl alkynyl ketoimines as the radical precursors, the reaction allows the introduction of a fluorine atom to the acridine skeleton during the construction of both the pyridine and benzene motifs from acyclic building blocks. The resulting 4-fluoroacridines exhibited pronounced fluorescent properties in the solid state.
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Affiliation(s)
- Weiyu Li
- School of Chemistry, Sun Yat-sen University, Guangzhou 510006, China
| | - Lei Zhou
- School of Chemistry, Sun Yat-sen University, Guangzhou 510006, China
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9
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Budeev A, Kantin G, Dar’in D, Krasavin M. Diazocarbonyl and Related Compounds in the Synthesis of Azoles. Molecules 2021; 26:2530. [PMID: 33926128 PMCID: PMC8123665 DOI: 10.3390/molecules26092530] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2021] [Revised: 04/21/2021] [Accepted: 04/22/2021] [Indexed: 12/15/2022] Open
Abstract
Diazocarbonyl compounds have found numerous applications in many areas of chemistry. Among the most developed fields of diazo chemistry is the preparation of azoles from diazo compounds. This approach represents a useful alternative to more conventional methods of the synthesis of azoles. A comprehensive review on the preparation of various azoles (oxazoles, thiazoles, imidazoles, pyrazoles, triazoles, and tetrazoles) from diazocarbonyl and related compounds is presented for the first time along with discussion of advantages and disadvantages of «diazo» approaches to azoles.
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Affiliation(s)
| | | | - Dmitry Dar’in
- Institute of Chemistry, St. Petersburg State University, 198504 Peterhof, Russia; (A.B.); (G.K.)
| | - Mikhail Krasavin
- Institute of Chemistry, St. Petersburg State University, 198504 Peterhof, Russia; (A.B.); (G.K.)
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10
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Jamshaid S, Devkota S, Lee YR. Catalyst- and Substituent-Controlled Regio- and Stereoselective Synthesis of Indolyl Acrylates by Lewis-Acid-Catalyzed Direct Functionalization of 3-Formylindoles with Diazo Esters. Org Lett 2021; 23:2140-2146. [PMID: 33650877 DOI: 10.1021/acs.orglett.1c00277] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
A facile and efficient In(OTf)3- and BF3·OEt2-catalyzed direct transformation of 3-formylindoles with diazo esters has been developed for synthesizing diverse and functionalized indolyl acrylates. This one-pot protocol furnishes various (Z)-α-hydroxy-β-indolyl acrylates, (E)-β-(2-alkoxy-2-oxoethoxy)-α-indolyl acrylates, and (Z)-3-hydroxy-2-indolyl acrylates by a catalyst- and substituent-controlled, regio- and stereoselective cascade reaction. The protocol has several advantages, including low loading of the catalyst, mild reaction conditions, broad scope, and high functional group tolerance. The synthesized compounds can be further converted into diversely functionalized materials.
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Affiliation(s)
- Sana Jamshaid
- School of Chemical Engineering, Yeungnam University, Gyeongsan 38541, Republic of Korea
| | - Shreedhar Devkota
- School of Chemical Engineering, Yeungnam University, Gyeongsan 38541, Republic of Korea
| | - Yong Rok Lee
- School of Chemical Engineering, Yeungnam University, Gyeongsan 38541, Republic of Korea
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11
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Zheng H, Wang R, Wang K, Wherritt D, Arman H, Doyle MP. Formal [4 + 4]-, [4 + 3]-, and [4 + 2]-cycloaddition reactions of donor-acceptor cyclobutenes, cyclopropenes and siloxyalkynes induced by Brønsted acid catalysis. Chem Sci 2021; 12:4819-4824. [PMID: 34168758 PMCID: PMC8179600 DOI: 10.1039/d1sc00158b] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2021] [Accepted: 02/16/2021] [Indexed: 02/04/2023] Open
Abstract
Brønsted acid catalyzed formal [4 + 4]-, [4 + 3]-, and [4 + 2]-cycloadditions of donor-acceptor cyclobutenes, cyclopropenes, and siloxyalkynes with benzopyrylium ions are reported. [4 + 2]-cyclization/deMayo-type ring-extension cascade processes produce highly functionalized benzocyclooctatrienes, benzocycloheptatrienes, and 2-naphthols in good to excellent yields and selectivities. Moreover, the optical purity of reactant donor-acceptor cyclobutenes is fully retained during the cascade. The 1,3-dicarbonyl product framework of the reaction products provides opportunities for salen-type ligand syntheses and the construction of fused pyrazoles and isoxazoles that reveal a novel rotamer-diastereoisomerism.
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Affiliation(s)
- Haifeng Zheng
- Department of Chemistry, The University of Texas at San Antonio One UTSA Circle San Antonio TX 78249 USA
| | - Rui Wang
- Department of Chemistry, The University of Texas at San Antonio One UTSA Circle San Antonio TX 78249 USA
| | - Kan Wang
- Department of Chemistry, The University of Texas at San Antonio One UTSA Circle San Antonio TX 78249 USA
| | - Daniel Wherritt
- Department of Chemistry, The University of Texas at San Antonio One UTSA Circle San Antonio TX 78249 USA
| | - Hadi Arman
- Department of Chemistry, The University of Texas at San Antonio One UTSA Circle San Antonio TX 78249 USA
| | - Michael P Doyle
- Department of Chemistry, The University of Texas at San Antonio One UTSA Circle San Antonio TX 78249 USA
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12
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Kulandai Raj AS, Narode AS, Liu RS. Gold(I)-Catalyzed Reactions between N-(o-Alkynylphenyl)imines and Vinyldiazo Ketones to Form 3-(Furan-2-ylmethyl)-1H-indoles via Postulated Azallyl Gold and Allylic Cation Intermediates. Org Lett 2021; 23:1378-1382. [DOI: 10.1021/acs.orglett.1c00038] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Affiliation(s)
- Antony Sekar Kulandai Raj
- Frontier Research Center of Matter Science and Technology, Department of Chemistry, National Tsing-Hua University, Hsinchu, Taiwan 30013, Republic of China
| | - Akshay Subhash Narode
- Frontier Research Center of Matter Science and Technology, Department of Chemistry, National Tsing-Hua University, Hsinchu, Taiwan 30013, Republic of China
| | - Rai-Shung Liu
- Frontier Research Center of Matter Science and Technology, Department of Chemistry, National Tsing-Hua University, Hsinchu, Taiwan 30013, Republic of China
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13
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Tu L, Gao L, Wang X, Shi R, Ma R, Li J, Lan X, Zheng Y, Liu J. [3 + 2] Cycloaddition of Nitrile Imines with Enamides: An Approach to Functionalized Pyrazolines and Pyrazoles. J Org Chem 2020; 86:559-573. [PMID: 33301335 DOI: 10.1021/acs.joc.0c02244] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
An efficient [3 + 2] cycloaddition of in situ generated nitrile imines with enamides has been established. A wide range of functionalized pyrazoline derivatives (53 examples) were obtained in moderate to good yields (up to 96%) under very mild conditions. This protocol features broad substrate scope, good functional group tolerance, and operational simplicity. Practical transformation of the products into useful pyrazoles via a one-pot process and the scalability of this protocol highlight the utility of this synthetic methodology.
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Affiliation(s)
- Liang Tu
- School of Pharmaceutical Sciences, South-Central University for Nationalities, Wuhan 430074, China
| | - Limei Gao
- School of Pharmaceutical Sciences, South-Central University for Nationalities, Wuhan 430074, China
| | - Xiaomeng Wang
- School of Pharmaceutical Sciences, South-Central University for Nationalities, Wuhan 430074, China
| | - Ruijie Shi
- School of Pharmaceutical Sciences, South-Central University for Nationalities, Wuhan 430074, China
| | - Rupei Ma
- School of Pharmaceutical Sciences, South-Central University for Nationalities, Wuhan 430074, China
| | - Junfei Li
- School of Pharmaceutical Sciences, South-Central University for Nationalities, Wuhan 430074, China
| | - Xiaoshuang Lan
- School of Pharmaceutical Sciences, South-Central University for Nationalities, Wuhan 430074, China
| | - Yongsheng Zheng
- School of Pharmaceutical Sciences, South-Central University for Nationalities, Wuhan 430074, China
| | - Jikai Liu
- School of Pharmaceutical Sciences, South-Central University for Nationalities, Wuhan 430074, China
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14
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Gollapelli KK, Patil VB, Vinaykumar A, Chegondi R. Rh(i)-catalyzed stereoselective desymmetrization of prochiral cyclohexadienones via highly exo-selective Huisgen-type [3 + 2] cycloaddition. Chem Sci 2020; 12:1544-1550. [PMID: 34163917 PMCID: PMC8179110 DOI: 10.1039/d0sc05543c] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023] Open
Abstract
A Rh(i)-catalyzed highly stereoselective desymmetrization of 2-alkynylbenzaldehyde-tethered cyclohexadienones triggered by intramolecular Huisgen-type [3 + 2] cycloaddition has been developed. This method enables convergent construction of complex epoxy-bridged polycyclic ring systems with five contiguous stereocenters with excellent exo-selectivity and broad substrate scope. The highly atom-economical process involves 6-endo-dig cyclization of carbonyl oxygen onto an activated alkyne resulting in a highly reactive metal–benzopyrylium intermediate, which readily undergoes intramolecular [3 + 2] annulation/hydration. Asymmetric induction is also achieved for the first time in Rh(i)-catalyzed 1,3-dipolar cycloaddition using an easily accessible chiral diene as the ligand. A Rh(i)-catalyzed highly stereoselective desymmetrization of 2-alkynylbenzaldehyde-tethered cyclohexadienones triggered by intramolecular Huisgen-type [3 + 2] cycloaddition has been developed.![]()
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Affiliation(s)
- Krishna Kumar Gollapelli
- Department of Organic Synthesis and Process Chemistry, CSIR-Indian Institute of Chemical Technology (CSIR-IICT) Hyderabad 500007 India.,Academy of Scientific and Innovative Research (AcSIR) Ghaziabad 201 002 India https://cramhcu.wixsite.com/rambabu-chegondi
| | - Vaibhav B Patil
- Department of Organic Synthesis and Process Chemistry, CSIR-Indian Institute of Chemical Technology (CSIR-IICT) Hyderabad 500007 India.,Academy of Scientific and Innovative Research (AcSIR) Ghaziabad 201 002 India https://cramhcu.wixsite.com/rambabu-chegondi
| | - Allam Vinaykumar
- Department of Organic Synthesis and Process Chemistry, CSIR-Indian Institute of Chemical Technology (CSIR-IICT) Hyderabad 500007 India.,Academy of Scientific and Innovative Research (AcSIR) Ghaziabad 201 002 India https://cramhcu.wixsite.com/rambabu-chegondi
| | - Rambabu Chegondi
- Department of Organic Synthesis and Process Chemistry, CSIR-Indian Institute of Chemical Technology (CSIR-IICT) Hyderabad 500007 India.,Academy of Scientific and Innovative Research (AcSIR) Ghaziabad 201 002 India https://cramhcu.wixsite.com/rambabu-chegondi
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15
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More SA, Chao T, Cheng M, Liu R. Gold‐Catalyzed Bicyclic and [3+2]‐Annulations of Internal Propargyl Alcohols with Nitrones and Imines To Yield to Two Distinct Heterocycles. Adv Synth Catal 2020. [DOI: 10.1002/adsc.202001119] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Affiliation(s)
- Sayaji Arjun More
- Frontier Research Centers of Matter Science and Technologies Department of Chemistry National Tsing Hua University Hsinchu Taiwan, ROC
| | - Tzu‐Hsuan Chao
- Department of Chemistry National Cheng Kung University Tainan 701 Taiwan, ROC
| | - Mu‐Jeng Cheng
- Department of Chemistry National Cheng Kung University Tainan 701 Taiwan, ROC
| | - Rai‐Shung Liu
- Frontier Research Centers of Matter Science and Technologies Department of Chemistry National Tsing Hua University Hsinchu Taiwan, ROC
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16
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Kardile RD, Liu RS. Gold(I)-Catalyzed Reactions between 2-(1-Alkynyl)-2-alken-1-ones and Vinyldiazo Ketones for Divergent Synthesis of Nonsymmetric Heteroaryl-Substituted Triarylmethanes: N- versus C-Attack Paths. Org Lett 2020; 22:8229-8233. [DOI: 10.1021/acs.orglett.0c02765] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Affiliation(s)
- Rahul Dadabhau Kardile
- Frontier Research Center of Matter Science and Technology, Department of Chemistry, National Tsing Hua University, Hsinchu 30013, Taiwan, ROC
| | - Rai-Shung Liu
- Frontier Research Center of Matter Science and Technology, Department of Chemistry, National Tsing Hua University, Hsinchu 30013, Taiwan, ROC
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17
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Zheng H, Dong K, Wherritt D, Arman H, Doyle MP. Brønsted Acid Catalyzed Friedel-Crafts-Type Coupling and Dedinitrogenation Reactions of Vinyldiazo Compounds. Angew Chem Int Ed Engl 2020; 59:13613-13617. [PMID: 32372540 DOI: 10.1002/anie.202004328] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2020] [Revised: 04/27/2020] [Indexed: 02/06/2023]
Abstract
The direct Friedel-Crafts-type coupling and dedinitrogenation reactions of vinyldiazo compounds with aromatic compounds using a metal-free strategy are described. This Brønsted acid catalyzed method is efficient for the formation of α-diazo β-carbocations (vinyldiazonium ions), vinyl carbocations, and allylic or homoallylic carbocation species via vinyldiazo compounds. By choosing suitable nucleophilic reagents to selectively capture these intermediates, both trisubstituted α,β-unsaturated esters, β-indole-substituted diazo esters, and dienes are obtained with good to high yields and selectivity. Experimental insights implicate a reaction mechanism involving the selective protonation of vinyldiazo compounds and the subsequent release of dinitrogen to form vinyl cations that undergo intramolecular 1,3- and 1,4- hydride transfer processes as well as fragmentation.
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Affiliation(s)
- Haifeng Zheng
- Department of Chemistry, The University of Texas at San Antonio, One UTSA Circle, San Antonio, TX, 78249, USA
| | - Kuiyong Dong
- Department of Chemistry, The University of Texas at San Antonio, One UTSA Circle, San Antonio, TX, 78249, USA
| | - Daniel Wherritt
- Department of Chemistry, The University of Texas at San Antonio, One UTSA Circle, San Antonio, TX, 78249, USA
| | - Hadi Arman
- Department of Chemistry, The University of Texas at San Antonio, One UTSA Circle, San Antonio, TX, 78249, USA
| | - Michael P Doyle
- Department of Chemistry, The University of Texas at San Antonio, One UTSA Circle, San Antonio, TX, 78249, USA
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18
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Zheng H, Dong K, Wherritt D, Arman H, Doyle MP. Brønsted Acid Catalyzed Friedel–Crafts‐Type Coupling and Dedinitrogenation Reactions of Vinyldiazo Compounds. Angew Chem Int Ed Engl 2020. [DOI: 10.1002/ange.202004328] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Affiliation(s)
- Haifeng Zheng
- Department of Chemistry The University of Texas at San Antonio One UTSA Circle San Antonio TX 78249 USA
| | - Kuiyong Dong
- Department of Chemistry The University of Texas at San Antonio One UTSA Circle San Antonio TX 78249 USA
| | - Daniel Wherritt
- Department of Chemistry The University of Texas at San Antonio One UTSA Circle San Antonio TX 78249 USA
| | - Hadi Arman
- Department of Chemistry The University of Texas at San Antonio One UTSA Circle San Antonio TX 78249 USA
| | - Michael P. Doyle
- Department of Chemistry The University of Texas at San Antonio One UTSA Circle San Antonio TX 78249 USA
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19
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Fang R, Yang L, Zhou L, Kirillov AM, Yang L. Carbocation versus Carbene Controlled Chemoselectivity: DFT Study on Gold- and Silver-Catalyzed Alkylation/Cyclopropanation of Indoles with Vinyl Diazoesters. Org Lett 2020; 22:4043-4048. [PMID: 32356993 DOI: 10.1021/acs.orglett.0c01476] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
Density functional theory calculations were performed to investigate the catalyst-controlled selective functionalization of indoles with vinyl diazoacetates. The detailed reaction mechanism was established, and different roles of carboncation or carbene intermediates in defining an experimentally observed chemo- and regioselectivity were fully rationalized.
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Affiliation(s)
- Ran Fang
- College of Chemistry and Chemical Engineering, Shaanxi University of Science and Technology, Xi'an 710021, P. R. China.,State Key Laboratory of Applied Organic Chemistry and Key Laboratory of Nonferrous Metals Chemistry and Resources Utilization of Gansu Province, College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou 730000, P. R. China
| | - Li Yang
- State Key Laboratory of Applied Organic Chemistry and Key Laboratory of Nonferrous Metals Chemistry and Resources Utilization of Gansu Province, College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou 730000, P. R. China
| | - Lin Zhou
- State Key Laboratory of Applied Organic Chemistry and Key Laboratory of Nonferrous Metals Chemistry and Resources Utilization of Gansu Province, College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou 730000, P. R. China
| | - Alexander M Kirillov
- Centro de Química Estrutural, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1049-001, Lisbon, Portugal.,Research Institute of Chemistry, Peoples' Friendship University of Russia (RUDN University), 6 Miklukho-Maklaya st., Moscow, 117198, Russian Federation
| | - Lizi Yang
- College of Chemistry and Chemical Engineering, Shaanxi University of Science and Technology, Xi'an 710021, P. R. China.,State Key Laboratory of Applied Organic Chemistry and Key Laboratory of Nonferrous Metals Chemistry and Resources Utilization of Gansu Province, College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou 730000, P. R. China
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20
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Sekar Kulandai Raj A, Liu R. Gold‐catalyzed [4+3]‐Annulations of Benzopyriliums with Vinyldiazo Carbonyls to Form Bicyclic Heptatriene Rings with Skeletal Rearrangement. Adv Synth Catal 2020. [DOI: 10.1002/adsc.202000292] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Affiliation(s)
- Antony Sekar Kulandai Raj
- Frontier Research Center for Fundamental and Basic Science of MattersDepartment of ChemistryNational Tsing-Hua University Hsinchu Taiwan, ROC
| | - Rai‐Shung Liu
- Frontier Research Center for Fundamental and Basic Science of MattersDepartment of ChemistryNational Tsing-Hua University Hsinchu Taiwan, ROC
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