1
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Mykura R, Sánchez-Bento R, Matador E, Duong VK, Varela A, Angelini L, Carbajo RJ, Llaveria J, Ruffoni A, Leonori D. Synthesis of polysubstituted azepanes by dearomative ring expansion of nitroarenes. Nat Chem 2024; 16:771-779. [PMID: 38273027 DOI: 10.1038/s41557-023-01429-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2022] [Accepted: 12/18/2023] [Indexed: 01/27/2024]
Abstract
The synthesis of functionalized nitrogen heterocycles is integral to discovering, manufacturing and evolving high-value materials. The availability of effective strategies for heterocycle synthesis often biases the frequency of specific ring systems over others in the core structures of bioactive leads. For example, while the six- and five-membered piperidine and pyrrolidine are widespread in medicinal chemistry libraries, the seven-membered azepane is essentially absent and this leaves open a substantial area of three-dimensional chemical space. Here we report a strategy to prepare complex azepanes from simple nitroarenes by photochemical dearomative ring expansion centred on the conversion of the nitro group into a singlet nitrene. This process is mediated by blue light, occurs at room temperature and transforms the six-membered benzenoid framework into a seven-membered ring system. A following hydrogenolysis provides the azepanes in just two steps. We have demonstrated the utility of the strategy with the synthesis of several azepane analogues of piperidine drugs.
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Affiliation(s)
- Rory Mykura
- Institute of Organic Chemistry, RWTH Aachen University, Aachen, Germany
| | | | - Esteban Matador
- Institute of Organic Chemistry, RWTH Aachen University, Aachen, Germany
- Departamento de Química Orgánica, Universidad de Sevilla and Centro de Innovación en Química Avanzada (ORFEO-CINQA), Sevilla, Spain
| | - Vincent K Duong
- Department of Chemistry, University of Manchester, Manchester, UK
| | - Ana Varela
- Institute of Organic Chemistry, RWTH Aachen University, Aachen, Germany
| | | | - Rodrigo J Carbajo
- In Silico Discovery, Therapeutics Discovery, Janssen Research & Development, Janssen-Cilag S.A., Toledo, Spain
| | - Josep Llaveria
- Global Discovery Chemistry, Therapeutics Discovery, Janssen Research & Development, Janssen-Cilag S.A., Toledo, Spain
| | - Alessandro Ruffoni
- Institute of Organic Chemistry, RWTH Aachen University, Aachen, Germany.
| | - Daniele Leonori
- Institute of Organic Chemistry, RWTH Aachen University, Aachen, Germany.
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2
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Mondal R, Agbaria M, Cohen O, Nairoukh Z. Brook Rearrangement as Trigger for Dearomatization Reaction: Synthesis of Non-Aromatic N-Heterocycles. Chemistry 2024; 30:e202303588. [PMID: 37930139 DOI: 10.1002/chem.202303588] [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: 10/31/2023] [Revised: 11/05/2023] [Accepted: 11/06/2023] [Indexed: 11/07/2023]
Abstract
The [1,2]-Brook rearrangement stands as a potent technique for constructing complex molecules. In this study, we showcase its power in the dearomatization of aromatic N-heterocycles. Through a concise four-step process that integrates lithiation, nucleophilic addition, Brook rearrangement and dearomatization reaction, we demonstrate a versatile strategy for generating diverse non-aromatic N-heterocycles which exhibit ambident reactivities. Various acyl silanes, halo-pyridines, and quinolines have been explored within this context. The synthetic utility of this methodology is demonstrated through the construction of complex architectures.
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Affiliation(s)
- Rajarshi Mondal
- Institute of Chemistry, The Hebrew University of Jerusalem, Jerusalem, 9190401, Israel
| | - Mohamed Agbaria
- Institute of Chemistry, The Hebrew University of Jerusalem, Jerusalem, 9190401, Israel
| | - Orit Cohen
- Institute of Chemistry, The Hebrew University of Jerusalem, Jerusalem, 9190401, Israel
| | - Zackaria Nairoukh
- Institute of Chemistry, The Hebrew University of Jerusalem, Jerusalem, 9190401, Israel
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3
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Selingo JD, Greenwood JW, Andrews MK, Patel C, Neel AJ, Pio B, Shevlin M, Phillips EM, Maddess ML, McNally A. A General Strategy for N-(Hetero)arylpiperidine Synthesis Using Zincke Imine Intermediates. J Am Chem Soc 2024; 146:936-945. [PMID: 38153812 DOI: 10.1021/jacs.3c11504] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2023]
Abstract
Methods to synthesize diverse collections of substituted piperidines are valuable due to the prevalence of this heterocycle in pharmaceutical compounds. Here, we present a general strategy to access N-(hetero)arylpiperidines using a pyridine ring-opening and ring-closing approach via Zincke imine intermediates. This process generates pyridinium salts from a wide variety of substituted pyridines and (heteroaryl)anilines; hydrogenation reactions and nucleophilic additions then access the N-(hetero)arylpiperidine derivatives. We successfully applied high-throughput experimentation (HTE) using pharmaceutically relevant pyridines and (heteroaryl)anilines as inputs and developed a one-pot process using anilines as nucleophiles in the pyridinium salt-forming processes. This strategy is viable for generating piperidine libraries and applications such as the convergent coupling of complex fragments.
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Affiliation(s)
- Jake D Selingo
- Department of Chemistry, Colorado State University, Fort Collins, Colorado 80523, United States
| | - Jacob W Greenwood
- Department of Chemistry, Colorado State University, Fort Collins, Colorado 80523, United States
| | - Mary Katherine Andrews
- Department of Chemistry, Colorado State University, Fort Collins, Colorado 80523, United States
| | - Chirag Patel
- Department of Chemistry, Colorado State University, Fort Collins, Colorado 80523, United States
| | - Andrew J Neel
- Department of Process Research and Development, Merck & Company, Incorporated, Boston, Massachusetts 02115, United States
| | - Barbara Pio
- Department of Discovery Chemistry, Merck & Co., Inc., Rahway, New Jersey 07065, United States
| | - Michael Shevlin
- Department of Process Research and Development, Merck & Co., Inc., Rahway, New Jersey 07065, United States
| | - Eric M Phillips
- Department of Process Research and Development, Merck & Co., Inc., Rahway, New Jersey 07065, United States
| | - Matthew L Maddess
- Department of Process Research and Development, Merck & Co., Inc., Boston, Massachusetts 02115, United States
| | - Andrew McNally
- Department of Chemistry, Colorado State University, Fort Collins, Colorado 80523, United States
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4
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Mohamed MAA, Kadry AM, Bekhit SA, Abourehab MAS, Amagase K, Ibrahim TM, El-Saghier AMM, Bekhit AA. Spiro heterocycles bearing piperidine moiety as potential scaffold for antileishmanial activity: synthesis, biological evaluation, and in silico studies. J Enzyme Inhib Med Chem 2023; 38:330-342. [PMID: 36444862 PMCID: PMC11003478 DOI: 10.1080/14756366.2022.2150763] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2022] [Accepted: 11/18/2022] [Indexed: 11/30/2022] Open
Abstract
New spiro-piperidine derivatives were synthesised via the eco-friendly ionic liquids in a one-pot fashion. The in vitro antileishmanial activity against Leishmania major promastigote and amastigote forms highlighted promising antileishmanial activity for most of the derivatives, with superior activity compared to miltefosine. The most active compounds 8a and 9a exhibited sub-micromolar range of activity, with IC50 values of 0.89 µM and 0.50 µM, respectively, compared to 8.08 µM of miltefosine. Furthermore, the antileishmanial activity reversal of these compounds via folic and folinic acids displayed comparable results to the positive control trimethoprim. This emphasises that their antileishmanial activity is through the antifolate mechanism via targeting DHFR and PTR1. The most active compounds showed superior selectivity and safety profile compared to miltefosine against VERO cells. Moreover, the docking experiments of 8a and 9a against Lm-PTR1 rationalised the observed in vitro activities. Molecular dynamics simulations confirmed a stable and high potential binding to Lm-PTR1.
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Affiliation(s)
| | - Asmaa M. Kadry
- Chemistry Department, Faculty of Science, Sohag University, Sohag, Egypt
| | - Salma A. Bekhit
- High Institute of Public Health, Alexandria University, Alexandria, Egypt
| | | | - Kikuko Amagase
- Laboratory of Pharmacology & Pharmacotherapeutics, College of Pharmaceutical Sciences, Ritsumeikan University, Kusatsu, Japan
| | - Tamer M. Ibrahim
- Department of Pharmaceutical Chemistry, Faculty of Pharmacy, Kafrelsheikh University, Kafr El-Sheikh, Egypt
| | | | - Adnan A. Bekhit
- Department of Pharmaceutical Chemistry, Faculty of Pharmacy, Alexandria University, Alexandria, Egypt
- Cancer Nanotechnology Research Laboratory (CNRL), Faculty of Pharmacy, Alexandria University, Alexandria, Egypt
- Allied Health Department, College of Health and Sport Sciences, University of Bahrain, Sakhir, Kingdom of Bahrain
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5
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Huang Y, Qi Z, Li X. Rhodium-Catalyzed Enantioselective Addition of Heteroarenium Salts Enabled by Nucleophilic Cyclization of 2-Alkynylanilines. Org Lett 2023; 25:8439-8444. [PMID: 37985509 DOI: 10.1021/acs.orglett.3c03300] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2023]
Abstract
Transition-metal-catalyzed cyclative coupling of 2-alkynylanilines provides a feasible routine for accessing functionalized indoles. Herein, a rhodium-catalyzed highly enantioselective addition of heteroarenium salts is presented, which is enabled by the nucleophilic cyclization of 2-alkynylanilines. It offers feasible protocols to access enantioenriched functionalized indoles tethered to 1,2-dihydropyridine and 1,2-dihydroquinoline motifs with excellent enantioselectivities.
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Affiliation(s)
- Yaling Huang
- School of Chemistry and Chemical Engineering, Shaanxi Normal University (SNNU), Xi'an, Shaanxi 710062, People's Republic of China
| | - Zisong Qi
- School of Chemistry and Chemical Engineering, Shaanxi Normal University (SNNU), Xi'an, Shaanxi 710062, People's Republic of China
| | - Xingwei Li
- School of Chemistry and Chemical Engineering, Shaanxi Normal University (SNNU), Xi'an, Shaanxi 710062, People's Republic of China
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6
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Pappoppula M, Olsen KL, Ketelboeter DR, Aponick A. Enantio- and Regioselective Copper-Catalyzed 1,2-Dearomatization of Pyridines. Angew Chem Int Ed Engl 2023; 62:e202312967. [PMID: 37820350 DOI: 10.1002/anie.202312967] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2023] [Revised: 10/05/2023] [Accepted: 10/09/2023] [Indexed: 10/13/2023]
Abstract
A copper-catalyzed dearomative alkynylation of pyridines is reported with excellent regio- and enantioselectivities. The synthetically valuable enantioenriched 2-alkynyl-1,2-dihydropyridine products afforded are generated from the readily available feedstock, pyridine, and commercially available terminal alkynes. The three-component reaction between a pyridine, a terminal alkyne, and methyl chloroformate employs copper chloride and StackPhos, a chiral biaryl P,N- ligand, as the catalytic system. Under mild reaction conditions, the desired 1,2-addition products are delivered in up to 99 % yield with regioselectivity ratios up to 25 : 1 and enantioselectivities values of up to 99 % ee. Activated and non-activated terminal alkynes containing a wide range of functional groups are well tolerated. Even acetylene gas delivered mono-alkynylated products in high yield and ee. Application of the methodology in an efficient enantioselective synthesis of the chiral piperidine indolizidine, coniceine, is reported.
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Affiliation(s)
- Mukesh Pappoppula
- Department of Chemistry and Florida Center for Heterocyclic Compounds, University of Florida, P.O. Box 117200, Gainesville, FL 32611, United States
| | - Kathryn L Olsen
- Department of Chemistry and Florida Center for Heterocyclic Compounds, University of Florida, P.O. Box 117200, Gainesville, FL 32611, United States
| | - Devin R Ketelboeter
- Department of Chemistry and Florida Center for Heterocyclic Compounds, University of Florida, P.O. Box 117200, Gainesville, FL 32611, United States
| | - Aaron Aponick
- Department of Chemistry and Florida Center for Heterocyclic Compounds, University of Florida, P.O. Box 117200, Gainesville, FL 32611, United States
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7
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Cerveri A, Vettori M, Serafino A, Maestri G. Base-promoted Conia-ene cyclization of propargyl amides. Org Biomol Chem 2023; 21:7311-7315. [PMID: 37671579 DOI: 10.1039/d3ob01107k] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 09/07/2023]
Abstract
We report a tBuOK-promoted synthesis of 1,3-dihydro-2H-pyrrol-2-one and 4-methylenepyrrolidin-2-one systems via Conia-ene like intramolecular cyclization. The method features extremely short reaction times (5 min) and mild reaction conditions (rt), enabling the trapping of a propargyl unit by an amide enolate. An intriguing anionic chain mechanism is at work, which can trigger the isomerization of an exo-alkene giving access to the otherwise elusive endo-product.
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Affiliation(s)
- Alessandro Cerveri
- Università di Parma, Dipartimento di Scienze Chimiche, della Vita e della Sostenibilità Ambientale, Parco Area delle Scienze 17/A, 43124 Parma, Italy.
| | - Mattia Vettori
- Università di Parma, Dipartimento di Scienze Chimiche, della Vita e della Sostenibilità Ambientale, Parco Area delle Scienze 17/A, 43124 Parma, Italy.
| | - Andrea Serafino
- Università di Parma, Dipartimento di Scienze Chimiche, della Vita e della Sostenibilità Ambientale, Parco Area delle Scienze 17/A, 43124 Parma, Italy.
| | - Giovanni Maestri
- Università di Parma, Dipartimento di Scienze Chimiche, della Vita e della Sostenibilità Ambientale, Parco Area delle Scienze 17/A, 43124 Parma, Italy.
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8
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Zhang B, Ruan J, Seidel D, Chen W. Palladium-Catalyzed Arylation of Endocyclic 1-Azaallyl Anions: Concise Synthesis of Unprotected Enantioenriched cis-2,3-Diarylpiperidines. Angew Chem Int Ed Engl 2023; 62:e202307638. [PMID: 37461285 PMCID: PMC10530244 DOI: 10.1002/anie.202307638] [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: 05/31/2023] [Accepted: 07/17/2023] [Indexed: 07/29/2023]
Abstract
Unprotected cis-2,3-diarylpiperidines are synthesized through an unprecedented palladium-catalyzed cross-coupling reaction between aryl halides and elusive endocyclic 1-azaallyl anions. These intermediates are generated in situ by the deprotonation of 2-aryl-1-piperideines, precursors that are readily prepared in two operations from simple piperidines. An asymmetric version of this reaction with (2R, 3R)-iPr-BI-DIME as the ligand provides products in moderate to good yields and enantioselectivities. This study significantly expands the synthetic utility of endocyclic 1-azaallyl anions.
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Affiliation(s)
- Biao Zhang
- School of Chemical Science and Engineering, Institute for Advanced Studies, Tongji University, 1239 Siping Rd, Shanghai, 200092, P. R. of China
| | - Junhao Ruan
- School of Chemical Science and Engineering, Institute for Advanced Studies, Tongji University, 1239 Siping Rd, Shanghai, 200092, P. R. of China
| | - Daniel Seidel
- Center for Heterocyclic Compounds, Department of Chemistry, University of Florida, Gainesville, FL 32611, USA
| | - Weijie Chen
- School of Chemical Science and Engineering, Institute for Advanced Studies, Tongji University, 1239 Siping Rd, Shanghai, 200092, P. R. of China
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9
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Du YD, Wang S, Du HW, Chang XY, Chen XY, Li YL, Shu W. Organophotocatalysed synthesis of 2-piperidinones in one step via [1 + 2 + 3] strategy. Nat Commun 2023; 14:5339. [PMID: 37660185 PMCID: PMC10475035 DOI: 10.1038/s41467-023-40197-x] [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: 03/12/2023] [Accepted: 07/13/2023] [Indexed: 09/04/2023] Open
Abstract
Six-membered N-containing heterocycles, such as 2-piperidinone derivatives, with diverse substitution patterns are widespread in natural products, drug molecules and serve as key precursors for piperidines. Thus, the development of stereoselective synthesis of multi-substituted 2-piperidinones are attractive. However, existing methods heavily rely on modification of pre-synthesized backbones which require tedious multi-step procedure and suffer from limited substitution patterns. Herein, an organophotocatalysed [1 + 2 + 3] strategy was developed to enable the one-step access to diverse substituted 2-piperidinones from easily available inorganic ammonium salts, alkenes, and unsaturated carbonyl compounds. This mild protocol exhibits exclusive chemoselectivity over two alkenes, tolerating both terminal and internal alkenes with a wide range of functional groups.
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Affiliation(s)
- Yi-Dan Du
- Shenzhen Grubbs Institute and Department of Chemistry, Southern University of Science and Technology, Shenzhen, 518055, Guangdong, P. R. China
| | - Shan Wang
- Shenzhen Grubbs Institute and Department of Chemistry, Southern University of Science and Technology, Shenzhen, 518055, Guangdong, P. R. China
- State Key Laboratory of Elemento-Organic Chemistry, Nankai University, 300071, Tianjin, P. R. China
| | - Hai-Wu Du
- Shenzhen Grubbs Institute and Department of Chemistry, Southern University of Science and Technology, Shenzhen, 518055, Guangdong, P. R. China
| | - Xiao-Yong Chang
- Shenzhen Grubbs Institute and Department of Chemistry, Southern University of Science and Technology, Shenzhen, 518055, Guangdong, P. R. China
| | - Xiao-Yi Chen
- Shenzhen Grubbs Institute and Department of Chemistry, Southern University of Science and Technology, Shenzhen, 518055, Guangdong, P. R. China
| | - Yu-Long Li
- College of Chemistry and Environmental Engineering, Sichuan University of Science and Engineering, 643000, Zigong, P. R. China
| | - Wei Shu
- Shenzhen Grubbs Institute and Department of Chemistry, Southern University of Science and Technology, Shenzhen, 518055, Guangdong, P. R. China.
- State Key Laboratory of Elemento-Organic Chemistry, Nankai University, 300071, Tianjin, P. R. China.
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10
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Yuan SP, Bao Q, Sun TJ, Zhao JQ, Wang ZH, You Y, Zhang YP, Zhou MQ, Yuan WC. Catalytic Enantioselective α-Allylation of Deconjugated Butenolides with Aza-π-allylpalladium 1,4-Dipoles: Access to Optically Pure 2-Piperidones Bearing an All-Carbon Quaternary Stereocenter. Org Lett 2022; 24:8348-8353. [DOI: 10.1021/acs.orglett.2c03383] [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)
- Shu-Pei Yuan
- Innovation Research Center of Chiral Drugs, Institute for Advanced Study, Chengdu University, Chengdu 610106, China
- National Engineering Research Center of Chiral Drugs, Chengdu Institute of Organic Chemistry, Chinese Academy of Sciences, Chengdu 610041, China
| | - Qing Bao
- Innovation Research Center of Chiral Drugs, Institute for Advanced Study, Chengdu University, Chengdu 610106, China
- School of Pharmacy, Zunyi Medical University, Zunyi 563006, China
| | - Ting-Jia Sun
- Innovation Research Center of Chiral Drugs, Institute for Advanced Study, Chengdu University, Chengdu 610106, China
- National Engineering Research Center of Chiral Drugs, Chengdu Institute of Organic Chemistry, Chinese Academy of Sciences, Chengdu 610041, China
| | - Jian-Qiang Zhao
- Innovation Research Center of Chiral Drugs, Institute for Advanced Study, Chengdu University, Chengdu 610106, China
| | - Zhen-Hua Wang
- Innovation Research Center of Chiral Drugs, Institute for Advanced Study, Chengdu University, Chengdu 610106, China
| | - Yong You
- Innovation Research Center of Chiral Drugs, Institute for Advanced Study, Chengdu University, Chengdu 610106, China
| | - Yan-Ping Zhang
- Innovation Research Center of Chiral Drugs, Institute for Advanced Study, Chengdu University, Chengdu 610106, China
| | - Ming-Qiang Zhou
- Innovation Research Center of Chiral Drugs, Institute for Advanced Study, Chengdu University, Chengdu 610106, China
- National Engineering Research Center of Chiral Drugs, Chengdu Institute of Organic Chemistry, Chinese Academy of Sciences, Chengdu 610041, China
| | - Wei-Cheng Yuan
- Innovation Research Center of Chiral Drugs, Institute for Advanced Study, Chengdu University, Chengdu 610106, China
- National Engineering Research Center of Chiral Drugs, Chengdu Institute of Organic Chemistry, Chinese Academy of Sciences, Chengdu 610041, China
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11
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Hu F, Chu Y, Cao Z, Li Y, Hui XP. Enantioselective Synthesis of Functionalized Tetrahydropyridines through Iridium-Catalyzed Formal [5+1] Annulation. Org Lett 2022; 24:6945-6950. [PMID: 36129810 DOI: 10.1021/acs.orglett.2c02750] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
An efficient iridium-catalyzed asymmetric formal [5+1] annulation by in situ generation of enamines as N-nucleophiles for the synthesis of tetrahydropyridine derivatives is disclosed. The methodology offers direct access to a wide variety of chiral tetrahydropyridine derivatives in moderate to good yields and excellent enantioselectivity.
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Affiliation(s)
- Fang Hu
- State Key Laboratory of Applied Organic Chemistry, College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou 730000, P. R. China
| | - Yunpeng Chu
- State Key Laboratory of Applied Organic Chemistry, College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou 730000, P. R. China
| | - Zhengqiang Cao
- State Key Laboratory of Applied Organic Chemistry, College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou 730000, P. R. China
| | - Yucheng Li
- State Key Laboratory of Applied Organic Chemistry, College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou 730000, P. R. China
| | - Xin-Ping Hui
- State Key Laboratory of Applied Organic Chemistry, College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou 730000, P. R. China
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12
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Mudráková B, Kisszékelyi P, Vargová D, Zakiewicz D, Šebesta R. Asymmetric Tandem Conjugate Addition and Reaction with Carbocations on Unsaturated Heterocycles. Adv Synth Catal 2022. [DOI: 10.1002/adsc.202101485] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Brigita Mudráková
- Comenius University in Bratislava Faculty of Natural Sciences Department of Organic Chemistry, Mlynská dolina Ilkovičova 6 842 15 Bratislava Slovakia
| | - Péter Kisszékelyi
- Comenius University in Bratislava Faculty of Natural Sciences Department of Organic Chemistry, Mlynská dolina Ilkovičova 6 842 15 Bratislava Slovakia
| | - Denisa Vargová
- Comenius University in Bratislava Faculty of Natural Sciences Department of Organic Chemistry, Mlynská dolina Ilkovičova 6 842 15 Bratislava Slovakia
| | - Dorota Zakiewicz
- Comenius University in Bratislava Faculty of Natural Sciences Department of Organic Chemistry, Mlynská dolina Ilkovičova 6 842 15 Bratislava Slovakia
| | - Radovan Šebesta
- Comenius University in Bratislava Faculty of Natural Sciences Department of Organic Chemistry, Mlynská dolina Ilkovičova 6 842 15 Bratislava Slovakia
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13
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Trifluoroethanol Promoted Castagnoli-Cushman Cycloadditions of Imines with Homophthalic Anhydride. MOLECULES (BASEL, SWITZERLAND) 2022; 27:molecules27030844. [PMID: 35164109 PMCID: PMC8839191 DOI: 10.3390/molecules27030844] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/05/2022] [Revised: 01/24/2022] [Accepted: 01/25/2022] [Indexed: 11/17/2022]
Abstract
Lactams are essential compounds in medicinal chemistry and key intermediates in the synthesis of natural products. The Castagnoli–Cushman reaction (CCR) of homophthalic anhydride with imines is an exciting method for accessing cyclic densely substituted lactam products. Most CCRs need to be catalyzed or heated. Herein, we report a new, efficient, metal and catalyst-free CCR for the synthesis of poly-substituted 3,4-lactams utilizing the unique properties of trifluoroethanol (TFE). This procedure provides high-speed and smooth access to a broad range of densely substituted 3,4-lactams in good yields and a 100% atom-economical fashion.
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14
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Tomar R, Bhattacharya D, Arulananda Babu S. Direct lactamization of β‐arylated δ‐aminopentanoic acid carboxamides: En route to 4‐aryl‐ 2‐piperidones, piperidines, antituberculosis molecule Q203 (Telacebec) and its analogues. ASIAN J ORG CHEM 2022. [DOI: 10.1002/ajoc.202100736] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Radha Tomar
- Indian Institute of Science Education and Research Mohali Chemical Sciences INDIA
| | | | - Srinivasarao Arulananda Babu
- Indian Institute of Science Education and Research Mohali Department of Chemical Sciences Knowledge City, Sector 81, SAS Nagar,Mohali, Manauli P.O., 140306 Mohali INDIA
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15
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Kuram MR, Yadav S, Chaudhary D, Maurya NK, Kumar D, Km I. Transfer hydrogenation of pyridinium and quinolinium species using ethanol as a hydrogen source to access saturated N-heterocycles. Chem Commun (Camb) 2022; 58:4255-4258. [DOI: 10.1039/d2cc00241h] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Catalytic transfer hydrogenation (TH) for the reduction of heterocycles is an emerging strategy for accessing biologically active saturated N-heterocycles. Herein, we report a TH protocol that utilizes ethanol as a...
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16
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Eckl R, Fischer S, Sonnleitner CM, Schmidhuber D, Rehbein J, Reiser O. Stereoselective Synthesis of Biologically Relevant Tetrahydropyridines and Dihydro-2 H-pyrans via Ring-Expansion of Monocyclopropanated Heterocycles. ACS ORGANIC & INORGANIC AU 2021; 2:169-174. [PMID: 36855453 PMCID: PMC9954292 DOI: 10.1021/acsorginorgau.1c00042] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
A stereoselective, scalable, and metal-free ring-expansion of monocyclopropanated pyrroles and furans has been developed, leading to value-added highly functionalized tetrahydropyridine and dihydro-2H-pyran derivatives. Featuring a cyclopropylcarbinyl cation rearrangement as the key step, the selective cleavage of the unactivated endocyclic cyclopropane C-C bond is achieved. Targeted transformations of the thus obtained six-membered heterocycles give access to versatile building blocks with relevance for drug synthesis.
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17
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Kondoh A, Ojima R, Terada M. Formal Fluorinative Ring Opening of 2-Benzoylpyrrolidines Utilizing [1,2]-Phospha-Brook Rearrangement for Synthesis of 2-Aryl-3-fluoropiperidines. Org Lett 2021; 23:7894-7899. [PMID: 34585940 DOI: 10.1021/acs.orglett.1c02907] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A ring expansion of 2-benzoylpyrrolidines, which involves the formal fluorinative ring opening utilizing the [1,2]-phospha-Brook rearrangement under Brønsted base catalysis and a subsequent intramolecular reductive amination, was developed. The operationally simple three-step protocol provides an efficient access to 2-aryl-3-fluoropiperidines. The methodology was further applied to the syntheses of azepanes and tetrahydroquinolines.
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Affiliation(s)
- Azusa Kondoh
- Research and Analytical Center for Giant Molecules, Graduate School of Science, Tohoku University, Aoba-ku, Sendai 980-8578, Japan
| | - Rihaku Ojima
- Department of Chemistry, Graduate School of Science, Tohoku University, Aoba-ku, Sendai 980-8578, Japan
| | - Masahiro Terada
- Department of Chemistry, Graduate School of Science, Tohoku University, Aoba-ku, Sendai 980-8578, Japan
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18
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Yang ZY, Luo H, Zhang M, Wang XC. Borane-Catalyzed Reduction of Pyridines via a Hydroboration/Hydrogenation Cascade. ACS Catal 2021. [DOI: 10.1021/acscatal.1c02876] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Affiliation(s)
- Zhao-Ying Yang
- State Key Laboratory and Institute of Elemento-Organic Chemistry, College of Chemistry, Nankai University, Tianjin 300071, People’s Republic of China
| | - Heng Luo
- State Key Laboratory and Institute of Elemento-Organic Chemistry, College of Chemistry, Nankai University, Tianjin 300071, People’s Republic of China
| | - Ming Zhang
- State Key Laboratory and Institute of Elemento-Organic Chemistry, College of Chemistry, Nankai University, Tianjin 300071, People’s Republic of China
| | - Xiao-Chen Wang
- State Key Laboratory and Institute of Elemento-Organic Chemistry, College of Chemistry, Nankai University, Tianjin 300071, People’s Republic of China
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19
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Yu S, Bickelhaupt FM, Hamlin TA. Switch From Pauli-Lowering to LUMO-Lowering Catalysis in Brønsted Acid-Catalyzed Aza-Diels-Alder Reactions. ChemistryOpen 2021; 10:784-789. [PMID: 34351072 PMCID: PMC8340067 DOI: 10.1002/open.202100172] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2021] [Revised: 07/20/2021] [Indexed: 12/16/2022] Open
Abstract
Brønsted acid-catalyzed inverse-electron demand (IED) aza-Diels-Alder reactions between 2-aza-dienes and ethylene were studied using quantum chemical calculations. The computed activation energy systematically decreases as the basic sites of the diene progressively become protonated. Our activation strain and Kohn-Sham molecular orbital analyses traced the origin of this enhanced reactivity to i) "Pauli-lowering catalysis" for mono-protonated 2-aza-dienes due to the induction of an asynchronous, but still concerted, reaction pathway that reduces the Pauli repulsion between the reactants; and ii) "LUMO-lowering catalysis" for multi-protonated 2-aza-dienes due to their highly stabilized LUMO(s) and more concerted synchronous reaction path that facilitates more efficient orbital overlaps in IED interactions. In all, we illustrate how the novel concept of "Pauli-lowering catalysis" can be overruled by the traditional concept of "LUMO-lowering catalysis" when the degree of LUMO stabilization is extreme as in the case of multi-protonated 2-aza-dienes.
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Affiliation(s)
- Song Yu
- Department of Theoretical ChemistryAmsterdam Institute of Molecular and Life Sciences (AIMMS)Amsterdam Center for Multiscale Modeling (ACMM)Vrije Universiteit AmsterdamDe Boelelaan 10831081 HVAmsterdamThe Netherlands) and
| | - F. Matthias Bickelhaupt
- Department of Theoretical ChemistryAmsterdam Institute of Molecular and Life Sciences (AIMMS)Amsterdam Center for Multiscale Modeling (ACMM)Vrije Universiteit AmsterdamDe Boelelaan 10831081 HVAmsterdamThe Netherlands) and
- Institute for Molecules and Materials (IMM)Radboud UniversityHeyendaalseweg 1356525 AJNijmegenThe Netherlands
| | - Trevor A. Hamlin
- Department of Theoretical ChemistryAmsterdam Institute of Molecular and Life Sciences (AIMMS)Amsterdam Center for Multiscale Modeling (ACMM)Vrije Universiteit AmsterdamDe Boelelaan 10831081 HVAmsterdamThe Netherlands) and
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20
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Morita N, Tamura O. Strategic Use of Difference of Valence of Gold Catalysts: Development of Cyclization Reactions Oriented toward Synthetic Diversity Using Propargylic Alcohols. J SYN ORG CHEM JPN 2021. [DOI: 10.5059/yukigoseikyokaishi.79.652] [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]
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21
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Varlet T, Masson G. Enamides and dienamides in phosphoric acid-catalysed enantioselective cycloadditions for the synthesis of chiral amines. Chem Commun (Camb) 2021; 57:4089-4105. [DOI: 10.1039/d1cc00590a] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
This feature article describes how enamides and dienamides can participate in chiral phosphoric acid catalyzed enantioselective cycloadditions to prepare a wide range of cyclic amines.
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Affiliation(s)
- Thomas Varlet
- Université Paris-Saclay
- Institut de Chimie des Substances Naturelles
- ICSN-CNRS UPR 2301
- 91198 Gif-sur-Yvette
- France
| | - Géraldine Masson
- Université Paris-Saclay
- Institut de Chimie des Substances Naturelles
- ICSN-CNRS UPR 2301
- 91198 Gif-sur-Yvette
- France
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22
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Mitkari SB, Medina-Ortíz A, Olivares-Romero JL, Vázquez MA, Peña-Cabrera E, Villegas Gómez C, Cruz Cruz D. Organocatalytic Cascade Reactions for the Diversification of Thiopyrano-Piperidone Fused Rings Utilizing Trienamine Activation. Chemistry 2020; 27:618-621. [PMID: 33169452 DOI: 10.1002/chem.202004553] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2020] [Revised: 11/05/2020] [Indexed: 11/10/2022]
Abstract
An aminocatalytic privileged diversity-oriented synthesis (ApDOS) strategy utilizing trienamine catalysis for the construction of diverse and complex thiopyrans-piperidone fused rings through a thia-Diels-Alder/nucleophilic ring-closing sequence by using dithioamides as activated heterodienophiles is reported. Following this strategy, a super cascade reaction to assemble nine fused rings can be achieved by employing a bis-dithioamide. Additionally, by linking an indole moiety on the dithioamide, a Pictet-Spengler type reaction can be promoted once the cascade sequence has been achieved, leading to more complex penta- hexa- and heptacyclic fused ring derivatives in a one-pot process. This investigation opens new perspectives for the synthesis of a new class of complex and diverse thiopyrans that contribute to populate new relevant regions in the chemical space.
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Affiliation(s)
- Suhas Balasaheb Mitkari
- Departamento de Química, División de Ciencias NaturalesyExactas, Universidad de Guanajuato, Noria Alta S/N, 36050 Guanajuato, Gto., México
| | - Alberto Medina-Ortíz
- Departamento de Química, División de Ciencias NaturalesyExactas, Universidad de Guanajuato, Noria Alta S/N, 36050 Guanajuato, Gto., México
| | - José Luis Olivares-Romero
- Red de Estudios Moleculares Avanzados, Instituto de Ecología A.C., Carretera Antigua a Coatepec 351, El Haya, Xalapa, Ver., 91070, México
| | - Miguel A Vázquez
- Departamento de Química, División de Ciencias NaturalesyExactas, Universidad de Guanajuato, Noria Alta S/N, 36050 Guanajuato, Gto., México
| | - Eduardo Peña-Cabrera
- Departamento de Química, División de Ciencias NaturalesyExactas, Universidad de Guanajuato, Noria Alta S/N, 36050 Guanajuato, Gto., México
| | - Clarisa Villegas Gómez
- Departamento de Química, División de Ciencias NaturalesyExactas, Universidad de Guanajuato, Noria Alta S/N, 36050 Guanajuato, Gto., México
| | - David Cruz Cruz
- Departamento de Química, División de Ciencias NaturalesyExactas, Universidad de Guanajuato, Noria Alta S/N, 36050 Guanajuato, Gto., México
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23
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Tran HV, Vu HD, Graton J, Jacquemin D, Renault J, Uriac P. Synthesis of heterocyclic enamine-zinc complexes as precursors of stereocontrolled substitution of nitrogen α-position. Tetrahedron Lett 2020. [DOI: 10.1016/j.tetlet.2020.152405] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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24
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Mohajer F, Ziarani GM, Moradi R. The Study of Several Synthesis Methods of Indolizidine (±)-209I and (±)-209B as Natural Alkaloids. CURR ORG CHEM 2020. [DOI: 10.2174/1385272824666200226113022] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
Natural products have received much attention due to their importance and
application. Indolizidine, categorized as an alkaloid, has several biological activities. The
synthesis of natural compounds such as indolizidines has attracted much attention from
many chemists’ and researchers’ perspectives. There are many areas to be explored in
this subject; that is why synthesizing indolizidine 209I and (±)-indolizidine 209B as
natural compounds have received much consideration. This review discloses the procedures
and methodology to provide (±)-indolizidine 209I and 209B due to the importance
of indolizidines.
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Affiliation(s)
| | | | - Razieh Moradi
- Department of Chemistry, Alzahra University, Tehran, Iran
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25
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Hayashi Y, Odoh AS, Kranidiotis‐Hisatomi N. Asymmetric Michael Reaction of Aldehydes and α‐Cyano α,β‐Unsaturated Esters Catalyzed by Diphenylprolinol Silyl Ether; a Facile Asymmetric Route to 3,4,5‐Trisubstituted Piperidines. ChemCatChem 2020. [DOI: 10.1002/cctc.202000113] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Yujiro Hayashi
- Department of Chemistry Graduate School of Science Tohoku University 6-3 Aza-Aoba Aramaki Aoba-ku, Sendai 980-8578 Japan
| | - Amaechi Shedrack Odoh
- Department of Chemistry Graduate School of Science Tohoku University 6-3 Aza-Aoba Aramaki Aoba-ku, Sendai 980-8578 Japan
| | - Nektarios Kranidiotis‐Hisatomi
- Department of Chemistry Graduate School of Science Tohoku University 6-3 Aza-Aoba Aramaki Aoba-ku, Sendai 980-8578 Japan
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26
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Shi Y, Tan X, Gao S, Zhang Y, Wang J, Zhang X, Yin Q. Direct Synthesis of Chiral NH Lactams via Ru-Catalyzed Asymmetric Reductive Amination/Cyclization Cascade of Keto Acids/Esters. Org Lett 2020; 22:2707-2713. [DOI: 10.1021/acs.orglett.0c00669] [Citation(s) in RCA: 21] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Affiliation(s)
- Yongjie Shi
- Shenzhen Grubbs Institute and Department of Chemistry, Southern University of Science and Technology, Shenzhen 518055, China
- Department of Chemistry, State Key Laboratory of Synthetic Chemistry, The University of Hong Kong, Pokfulam Road, Hong Kong, P. R. China
| | - Xuefeng Tan
- Shenzhen Grubbs Institute and Department of Chemistry, Southern University of Science and Technology, Shenzhen 518055, China
| | - Shuang Gao
- Shenzhen Grubbs Institute and Department of Chemistry, Southern University of Science and Technology, Shenzhen 518055, China
| | - Yao Zhang
- Shenzhen Grubbs Institute and Department of Chemistry, Southern University of Science and Technology, Shenzhen 518055, China
| | - Jingxin Wang
- Shenzhen Grubbs Institute and Department of Chemistry, Southern University of Science and Technology, Shenzhen 518055, China
| | - Xumu Zhang
- Shenzhen Grubbs Institute and Department of Chemistry, Southern University of Science and Technology, Shenzhen 518055, China
| | - Qin Yin
- Shenzhen Grubbs Institute and Department of Chemistry, Southern University of Science and Technology, Shenzhen 518055, China
- Academy for Advanced Interdisciplinary Studies, Southern University of Science and Technology, Shenzhen 518000, China
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27
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Tikhov RM, Kuznetsov NY. Construction of piperidine-2,4-dione-type azaheterocycles and their application in modern drug development and natural product synthesis. Org Biomol Chem 2020; 18:2793-2812. [DOI: 10.1039/d0ob00287a] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
The review surveys the existing routes to piperidine-2,4-dione-type heterocycles including derivatives with the most vital types of biological activity. This heterocyclic platform is ideal for the construction of modern drugs and natural products.
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Affiliation(s)
- Rabdan M. Tikhov
- A.N. Nesmeyanov Institute of Organoelement Compounds
- Russian Academy of Sciences
- Moscow
- Russian Federation
| | - Nikolai Yu. Kuznetsov
- A.N. Nesmeyanov Institute of Organoelement Compounds
- Russian Academy of Sciences
- Moscow
- Russian Federation
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28
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Febvay J, Sanogo Y, Retailleau P, Gogoi MP, Sahoo AK, Marinetti A, Voituriez A. Enantioselective Gold(I)-Catalyzed Hydrative Cyclizations of N-Propargyl-ynamides into 3,6-Dihydropyridinones. Org Lett 2019; 21:9281-9285. [PMID: 31762272 DOI: 10.1021/acs.orglett.9b02644] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
This study discloses the first enantioselective variant of the gold(I)-catalyzed hydrative cyclizations of ynamides, which have been implemented by using bis-gold(I) complexes of chiral diphosphines. Starting from N-propargyl-ynamides and water in the presence of p-toluenesulfonic acid, the cyclization reactions afford N-tosyl-3,6-dihydropyridin-2(1H)-ones in good isolated yields and with high levels of stereocontrol (20 examples, enantiomeric ratios up to 94:6).
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Affiliation(s)
- Julie Febvay
- Institut de Chimie des Substances Naturelles , CNRS UPR 2301, Université Paris-Sud, Université Paris-Saclay , 1 av. de la Terrasse , 91198 Gif-sur-Yvette , France
| | - Youssouf Sanogo
- Institut de Chimie des Substances Naturelles , CNRS UPR 2301, Université Paris-Sud, Université Paris-Saclay , 1 av. de la Terrasse , 91198 Gif-sur-Yvette , France
| | - Pascal Retailleau
- Institut de Chimie des Substances Naturelles , CNRS UPR 2301, Université Paris-Sud, Université Paris-Saclay , 1 av. de la Terrasse , 91198 Gif-sur-Yvette , France
| | | | - Akhila K Sahoo
- School of Chemistry , University of Hyderabad , Hyderabad 500046 , India
| | - Angela Marinetti
- Institut de Chimie des Substances Naturelles , CNRS UPR 2301, Université Paris-Sud, Université Paris-Saclay , 1 av. de la Terrasse , 91198 Gif-sur-Yvette , France
| | - Arnaud Voituriez
- Institut de Chimie des Substances Naturelles , CNRS UPR 2301, Université Paris-Sud, Université Paris-Saclay , 1 av. de la Terrasse , 91198 Gif-sur-Yvette , France
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29
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Robinson DJ, Spurlin SP, Gorden JD, Karimov RR. Enantioselective Synthesis of Dihydropyridines Containing Quaternary Stereocenters Through Dearomatization of Pyridinium Salts. ACS Catal 2019. [DOI: 10.1021/acscatal.9b03874] [Citation(s) in RCA: 23] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Affiliation(s)
- Donovan J. Robinson
- Department of Chemistry and Biochemistry, Auburn University, 378 Chemistry Building, Auburn, Alabama 36849, United States
| | - Sean P. Spurlin
- Department of Chemistry and Biochemistry, Auburn University, 378 Chemistry Building, Auburn, Alabama 36849, United States
| | - John D. Gorden
- Department of Chemistry and Biochemistry, Auburn University, 378 Chemistry Building, Auburn, Alabama 36849, United States
| | - Rashad R. Karimov
- Department of Chemistry and Biochemistry, Auburn University, 378 Chemistry Building, Auburn, Alabama 36849, United States
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30
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Trost BM, Sarkar D, Bera N. Redox Economic Synthesis of TrisubstitutedPiperidones via Ruthenium Catalyzed Atom‐Economic Couplings of N‐Protected 1,5‐Aminoalcohols and Michael Acceptors. Adv Synth Catal 2019. [DOI: 10.1002/adsc.201900881] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Barry M. Trost
- Department of ChemistryStanford University Stanford California 94305-5080 United States
| | - Debayan Sarkar
- Department of ChemistryNational Institute of Technology Rourkela- 769008 India
| | - Nabakumar Bera
- Department of ChemistryNational Institute of Technology Rourkela- 769008 India
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31
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Vereshchagin AN, Karpenko KA, Elinson MN, Minaeva AP, Goloveshkin AS, Hansford KA, Egorov MP. One-pot five-component high diastereoselective synthesis of polysubstituted 2-piperidinones from aromatic aldehydes, nitriles, dialkyl malonates and ammonium acetate. Mol Divers 2019; 24:1327-1342. [PMID: 31646447 DOI: 10.1007/s11030-019-09997-6] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2019] [Accepted: 09/24/2019] [Indexed: 12/16/2022]
Abstract
A novel five-component diastereoselective synthesis of polysubstituted 2-piperidinones is reported. The Knoevenagel condensation-Michael addition-Mannich cascade of two equivalents of aromatic aldehydes, nitriles, dialkyl malonates and ammonium acetate or aqueous ammonia in alcohols provides convenient access to alkyl (3SR,4RS,6SR)-5,5-dicyano-2-oxo-4,6-diarylpiperidine-3-carboxylates with three stereocenters in 52-90% or dialkyl (2SR,3RS,4RS,5SR)-2,4-diaryl-3-cyano-6-oxopiperidine-3,5-dicarboxylates with four stereocenters in 38-88%. The formation of products was highly stereoselective, with only one diastereomer formed. Ammonium acetate or aqueous ammonia plays a role both as a catalyst and as a nitrogen source. 2,4,6-triaryl-3,3,5,5-tetracyanopiperidines were obtained as a side products in the reactions with nitro-substituted aldehydes or with ethyl and n-propyl cyanoacetates. A series of 14 2-piperidinones and piperidines was assessed for antimicrobial activity against a panel of five bacteria and two fungi; no significant activity was observed. Two side piperidines with nitro substituents in aromatic ring possess bacteriostatic action against S. aureus ATCC 43300 and A. baumannii ATCC 19606 at 32 ug/mL.
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Affiliation(s)
- Anatoly N Vereshchagin
- N. D. Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, Moscow, Russia, 119991.
| | - Kirill A Karpenko
- N. D. Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, Moscow, Russia, 119991
| | - Michail N Elinson
- N. D. Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, Moscow, Russia, 119991
| | - Alexandra P Minaeva
- N. D. Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, Moscow, Russia, 119991.,D. I Mendeleev University of Chemical Technology of Russia, Miusskaya Square 9, Moscow, Russia, 125047
| | - Alexander S Goloveshkin
- A. N. Nesmeyanov Institute of Organoelement Compounds, Vaviliva str., 28, Moscow, Russia, 119991
| | - Karl A Hansford
- Institute for Molecular Bioscience, The University of Queensland, Brisbane, QLD, 4072, Australia
| | - Mikhail P Egorov
- N. D. Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, Moscow, Russia, 119991
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32
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Highly diastereoselective four-component synthesis of polysubstituted 2-piperidinones with three and four stereogenic centers. RESEARCH ON CHEMICAL INTERMEDIATES 2019. [DOI: 10.1007/s11164-019-04027-4] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
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33
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Wu YK, Rawal VH. Rapid construction of tetrahydropyridine scaffolds via formal imino Diels-Alder reactions of Schiff bases and Nazarov reagents. Org Biomol Chem 2019; 17:8827-8831. [PMID: 31553010 DOI: 10.1039/c9ob01880h] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Described is a one-flask, two-step method for the synthesis of highly functionalized piperidines. The process involves formal [4 + 2] cycloadditions of Schiff bases and Nazarov reagents, followed by facile elaborations of the initial cycloadducts. Notably, these aza-annulations are facilitated by protic solvents and proceed smoothly under ambient conditions, without other additives. The synthetic utility of this annulation protocol is further showcased through a concise, convergent synthesis of (±)-tetrabenazine.
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Affiliation(s)
- Yen-Ku Wu
- Department of Applied Chemistry, National Chiao Tung University, 1001 University Road, Hsinchu 30010, Taiwan.
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34
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Guo Y, Harutyunyan SR. Highly Enantioselective Catalytic Addition of Grignard Reagents to N-Heterocyclic Acceptors. Angew Chem Int Ed Engl 2019; 58:12950-12954. [PMID: 31257687 PMCID: PMC6772156 DOI: 10.1002/anie.201906237] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2019] [Revised: 06/23/2019] [Indexed: 01/14/2023]
Abstract
General methods to prepare chiral N‐heterocyclic molecular scaffolds are greatly sought after because of their significance in medicinal chemistry. Described here is the first general catalytic methodology to access a wide variety of chiral 2‐ and 4‐substituted tetrahydro‐quinolones, dihydro‐4‐pyridones, and piperidones with excellent yields and enantioselectivities, utilizing a single catalyst system.
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Affiliation(s)
- Yafei Guo
- Stratingh Institute for Chemistry, University of Groningen, Nijenborgh 4, 9747 AG, Groningen, The Netherlands
| | - Syuzanna R Harutyunyan
- Stratingh Institute for Chemistry, University of Groningen, Nijenborgh 4, 9747 AG, Groningen, The Netherlands
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35
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Guo Y, Harutyunyan SR. Highly Enantioselective Catalytic Addition of Grignard Reagents to N‐Heterocyclic Acceptors. Angew Chem Int Ed Engl 2019. [DOI: 10.1002/ange.201906237] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Yafei Guo
- Stratingh Institute for Chemistry University of Groningen Nijenborgh 4 9747 AG Groningen The Netherlands
| | - Syuzanna R. Harutyunyan
- Stratingh Institute for Chemistry University of Groningen Nijenborgh 4 9747 AG Groningen The Netherlands
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36
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Issayeva U, Akhmetova G, Datkhayev U, Omyrzakov M, Praliyev K, Ross S. The Search for Biologically Active Compounds in the Series of N-ethoxyethylpiperidine Derivatives. EURASIAN CHEMICO-TECHNOLOGICAL JOURNAL 2019. [DOI: 10.18321/ectj822] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
Abstract
With the aim to introduce fragment of cyclopropane and fragments of p-, m-, o-fluorophenyls into the structures of N-ethoxyethylpiperidines, acylation of oxime and phenylacetylenic alcohol of 1-(2-ethoxyethyl)-4-ketopiperidine by cyclopropanecarbonylchloride was carried out; on the basis of 1-(2-ethoxyethyl)-4-ethynyl-4-hydroxypiperidine (cascaine alcohol), acylation by 4-fluoro-, 3-fluoro-, 2-fluorobenzoylchlorides was carried out with formation of the corresponding piperidine containing hydrochlorides of cyclopropanecarboxylic acid esters and para-, meta-, ortho-fluorobenzoic esters. Acylation reaction on the hydroxyl group of compounds is carried out in absolute dioxane, the acylating agents are cyclopropanecarbonylchloride, p-, m-, o-fluorobenzoyl chlorides taken in excess. The obtained esters of cyclopropanecarboxylic and para-, meta-, ortho-fluorobenzoic acids are crystalline substances with a clear melting point, well soluble in water, ethanol, acetone. P-fluorobenzoates are obtained with better yields, m-fluorobenzoates occupy an intermediate position, and o-fluorobenzoates are formed with the lowest yields. The best yields of fluorobenzoates are obtained using dioxane as a solvent. Para-, meta-, ortho-fluorobenzoic esters of 1-(2-ethoxyethyl)-4-ethynyl-4-hydroxypiperidine coded A-4 – A-6 were studied for the presence of antimicrobial activity, the actions of these preparations were evaluated in vitro in relation to strains of gram-positive bacteria Staphylococcus aureus, Bacillus subtilis, gram-negative strains of Escheriсhia coli, Pseudomonas aeruginosa and to yeast fungus Сandida albicans by the diffusion method into agar (holes). Introduction of fluorine atom into the structure of cascaine lead to manifestation of antimicrobial activity.
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Burdzhiev NT, Baramov TI, Stanoeva ER, Yanev SG, Stoyanova TD, Dimitrova DH, Kostadinova KA. Synthesis of novel trans-4-(phthalimidomethyl)- and 4-(imidazol-1-ylmethyl)-3-indolyl-tetrahydroisoquinolinones as possible aromatase inhibitors. CHEMICAL PAPERS 2019. [DOI: 10.1007/s11696-018-00677-7] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
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Chowdhury S, Mao J, Martynow J, Zhao H, Duffy E, Wu Y, Thakur V, Sirasani G, Tang Y, Collin F, Sinishtaj S, Bhattacharjee A. Diastereoselective scalable synthesis of 2,6-trans-Piperidines using an aza-Michael reaction. Tetrahedron Lett 2019. [DOI: 10.1016/j.tetlet.2018.12.061] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Wood A, Prichard KL, Clarke Z, Houston TA, Fleet GWJ, Simone MI. Synthetic Pathways to 3,4,5-Trihydroxypiperidines from the Chiral Pool. European J Org Chem 2018. [DOI: 10.1002/ejoc.201800943] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Affiliation(s)
- Adam Wood
- Discipline of Chemistry; University of Newcastle; 2308 Callaghan NSW Australia
- Priority Research Centre for Chemical Biology & Clinical Pharmacology; University of Newcastle; 2308 Callaghan NSW Australia
| | - Kate L. Prichard
- Discipline of Chemistry; University of Newcastle; 2308 Callaghan NSW Australia
- Priority Research Centre for Chemical Biology & Clinical Pharmacology; University of Newcastle; 2308 Callaghan NSW Australia
| | - Zane Clarke
- Discipline of Chemistry; University of Newcastle; 2308 Callaghan NSW Australia
- Priority Research Centre for Chemical Biology & Clinical Pharmacology; University of Newcastle; 2308 Callaghan NSW Australia
- Department of Chemistry; Juniata College; PA16652-2196 Huntingdon Pennsylvania USA
| | - Todd A. Houston
- Institute for Glycomics; Griffith University (Gold Coast); 4215 Southport QLD Australia
| | | | - Michela I. Simone
- Discipline of Chemistry; University of Newcastle; 2308 Callaghan NSW Australia
- Priority Research Centre for Chemical Biology & Clinical Pharmacology; University of Newcastle; 2308 Callaghan NSW Australia
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Liao G, Yang D, Ma L, Li W, Hu L, Zeng L, Wu P, Duan L, Liu Z. The development of piperidinones as potent MDM2-P53 protein-protein interaction inhibitors for cancer therapy. Eur J Med Chem 2018; 159:1-9. [DOI: 10.1016/j.ejmech.2018.09.044] [Citation(s) in RCA: 33] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2018] [Revised: 09/13/2018] [Accepted: 09/14/2018] [Indexed: 11/29/2022]
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41
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Keerthi Krishnan K, Ujwaldev SM, Saranya S, Anilkumar G, Beller M. Recent Advances and Perspectives in the Synthesis of Heterocycles
via
Zinc Catalysis. Adv Synth Catal 2018. [DOI: 10.1002/adsc.201800868] [Citation(s) in RCA: 30] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- K. Keerthi Krishnan
- School of Chemical SciencesMahatma Gandhi University Priyadarsini Hills P O Kottayam 686 560 India
| | | | - Salim Saranya
- School of Chemical SciencesMahatma Gandhi University Priyadarsini Hills P O Kottayam 686 560 India
| | - Gopinathan Anilkumar
- School of Chemical SciencesMahatma Gandhi University Priyadarsini Hills P O Kottayam 686 560 India
| | - Matthias Beller
- Leibniz-Institut für Katalyse e.V. an der Universität Rostock (LIKAT Rostock) Albert-Einstein Straße 29a 18059 Rostock Germany
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42
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Yamazaki S, Naito T, Tatsumi T, Kakiuchi K. Synthesis of Piperidines via Intramolecular Hydride Transfer from α-Amino sp 3
Carbon Atoms to Ethenetricarboxylate-Derived Fragments and Further Cyclization. ChemistrySelect 2018. [DOI: 10.1002/slct.201800447] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Shoko Yamazaki
- Department of Chemistry; Nara University of Education, Takabatake-cho; Nara 630-8528 Japan
| | - Taku Naito
- Department of Chemistry; Nara University of Education, Takabatake-cho; Nara 630-8528 Japan
| | - Taiki Tatsumi
- Department of Chemistry; Nara University of Education, Takabatake-cho; Nara 630-8528 Japan
| | - Kiyomi Kakiuchi
- Graduate School of Materials Science; Nara Institute of Science and Technology (NAIST), Takayama; Ikoma Nara 630-0192 Japan
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43
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Claveau R, Twamley B, Connon SJ. Dynamic kinetic resolution of bis-aryl succinic anhydrides: enantioselective synthesis of densely functionalised γ-butyrolactones. Chem Commun (Camb) 2018. [PMID: 29533401 DOI: 10.1039/c8cc00609a] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The efficient Dynamic Kinetic Resolution (DKR) of disubstituted anhydrides has been shown to be possible for the first time. Using an ad hoc designed organocatalyst and an enantio- and diastereoselective cycloaddition process with aldehydes, stereochemically complex γ-butyrolactone derivatives can be obtained - with control over three contiguous stereocentres, one of which is all carbon quaternary.
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Affiliation(s)
- Romain Claveau
- School of Chemistry Trinity Biomedical Sciences Institute, Trinity College Dublin, 152-160 Pearse Street, Dublin 2, Ireland.
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Pan Z, Wang S, Brethorst JT, Douglas CJ. Palladium and Lewis-Acid-Catalyzed Intramolecular Aminocyanation of Alkenes: Scope, Mechanism, and Stereoselective Alkene Difunctionalizations. J Am Chem Soc 2018; 140:3331-3338. [PMID: 29465996 DOI: 10.1021/jacs.8b01330] [Citation(s) in RCA: 33] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
An expansion of methodologies aimed at the formation of versatile organonitriles, via the intramolecular aminocyanation of unactivated alkenes, is herein reported. Importantly, the need for a rigid tether in these reactions has been obviated. The ease-of-synthesis and viability of substrates bearing flexible backbones has permitted for diastereoselective variants as well. We demonstrated the utility of this methodology with the formation of pyrrolidones, piperidinones, isoindolinones, and sultams. Furthermore, subsequent transformation of these motifs into medicinally relevant molecules is also demonstrated. A double crossover 13C-labeling experiment is consistent with a fully intramolecular cyclization mechanism. Deuterium labeling experiments support a mechanism involving syn-addition across the alkene.
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Affiliation(s)
- Zhongda Pan
- Department of Chemistry , University of Minnesota-Twin Cities , 207 Pleasant St. SE , Minneapolis , Minnesota 55455 , United States
| | - Shengyang Wang
- Department of Chemistry , University of Minnesota-Twin Cities , 207 Pleasant St. SE , Minneapolis , Minnesota 55455 , United States
| | - Jason T Brethorst
- Department of Chemistry , University of Minnesota-Twin Cities , 207 Pleasant St. SE , Minneapolis , Minnesota 55455 , United States
| | - Christopher J Douglas
- Department of Chemistry , University of Minnesota-Twin Cities , 207 Pleasant St. SE , Minneapolis , Minnesota 55455 , United States
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Davison EK, Sperry J. Natural Products with Heteroatom-Rich Ring Systems. JOURNAL OF NATURAL PRODUCTS 2017; 80:3060-3079. [PMID: 29135244 DOI: 10.1021/acs.jnatprod.7b00575] [Citation(s) in RCA: 47] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
This review focuses on all known natural products that contain a "heteroatom-rich" ring system, specifically a five-, six- or seven-membered ring that contains three or more heteroatoms. The isolation and biological activity of these natural products is discussed, along with the biosynthetic processes that Nature employs to assemble these rare heterocyclic frameworks.
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Affiliation(s)
- Emma K Davison
- School of Chemical Sciences, University of Auckland , 23 Symonds Street, Auckland 1142, New Zealand
| | - Jonathan Sperry
- School of Chemical Sciences, University of Auckland , 23 Symonds Street, Auckland 1142, New Zealand
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Yang Y, Hardman C. Synthetic versatility of 2-substituted-6-methyl 2,3-dihydropyridinones in the synthesis of polyfunctional piperidine-based compounds and related β amino acid derivatives. Org Biomol Chem 2017; 15:8576-8593. [PMID: 28975943 DOI: 10.1039/c7ob01948c] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Chiral 2-substituted-6-methyl 2,3-dihydropyidinones 9, which can be facilely obtained from an asymmetric vinylogous Mannich reaction (VMR) with 1,3-bis-trimethysily enol ether, were used as versatile intermediates in constructing chiral polyfunctional piperidine-based compounds. The 6-methyl group of such compounds can be conveniently functionalized via alkylation and acylation reactions to provide efficient entries to the synthesis of a variety of chiral multi-substituted piperidine-based compounds. Further elaboration of the corresponding intermediates also provided access to polyfunctional indolizidine-based compounds. These methods were showcased in an asymmetric synthesis of 2,6-di-substituted piperidine compound 13, reported as the key intermediate in the synthesis of (+)-calvine and a natural alkaloid (-)-indolizidine 209D. Furthermore, selective C5 iodination of compound 9 enabled the installation of additional functional groups at this position. Finally, we demonstrated that the oxidative cleavage of 2-substituted-6-methyl-2,3-dihydropyidinones is a practical and efficient method for the enantioselective synthesis of β-amino acids, which can undergo further intra-molecular cyclization to give the corresponding chiral four-membered β-lactam derivatives.
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Affiliation(s)
- Yang Yang
- Genomics Institute of the Novartis Research Foundation, 10675 John Jay Hopkins Drive, San Diego, California 92121, USA.
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47
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Zhang R, Li Y, Ali A, Hao J, Bi X, Fu J. Rh(II)-Catalyzed Tandem Cyclization of Aliphatic N
-Sulfonyl-1,2,3-triazoles and Alcohols for the Synthesis of 6-Alkoxy Piperidin-3-ones. Adv Synth Catal 2017. [DOI: 10.1002/adsc.201700882] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Ran Zhang
- Jilin Province Key Laboratory of Organic Functional Molecular Design & Synthesis; Department of Chemistry; Northeast Normal University; Changchun 130024 People's Repulic of China
| | - Yang Li
- Jilin Province Key Laboratory of Organic Functional Molecular Design & Synthesis; Department of Chemistry; Northeast Normal University; Changchun 130024 People's Repulic of China
| | - Arshad Ali
- Jilin Province Key Laboratory of Organic Functional Molecular Design & Synthesis; Department of Chemistry; Northeast Normal University; Changchun 130024 People's Repulic of China
| | - Jiamin Hao
- Jilin Province Key Laboratory of Organic Functional Molecular Design & Synthesis; Department of Chemistry; Northeast Normal University; Changchun 130024 People's Repulic of China
| | - Xihe Bi
- Jilin Province Key Laboratory of Organic Functional Molecular Design & Synthesis; Department of Chemistry; Northeast Normal University; Changchun 130024 People's Repulic of China
- State Key Laboratory of Elemento-Organic Chemistry; Nankai University; Tianjin 300071 China
| | - Junkai Fu
- Jilin Province Key Laboratory of Organic Functional Molecular Design & Synthesis; Department of Chemistry; Northeast Normal University; Changchun 130024 People's Repulic of China
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Yu Y, Humeidi R, Alleyn JR, Doyle MP. Catalytic Allylic Oxidation of Cyclic Enamides and 3,4-Dihydro-2H-Pyrans by TBHP. J Org Chem 2017; 82:8506-8513. [PMID: 28723085 DOI: 10.1021/acs.joc.7b01163] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Allylic oxidation of heteroatom substituted cyclic alkenes by tert-butyl hydroperoxide (70% TBHP in water) using catalytic dirhodium caprolactamate [Rh2(cap)4] forms enone products with a variety of 2-substituted cyclic enamides and 3,4-dihyro-2H-pyrans. These reactions occur under mild reaction conditions, are operationally convenient to execute, and are effective for product formation with as low as 0.25 mol% catalyst loading. With heteroatom stabilization of the intermediate allylic free radical two sites for oxidative product formation are possible, and the selectivity of the oxidative process varies with the heteroatom when R = H. Cyclic enamides produce 4-piperidones in good yields when R = alkyl or aryl, but oxidation of 2H-pyrans also gives alkyl cleavage products. Alternative catalysts for TBHP oxidations show comparable selectivities but give lower product yields.
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Affiliation(s)
- Yang Yu
- Department of Chemistry, The University of Texas at San Antonio , San Antonio, Texas 78249, United States
| | - Ranad Humeidi
- Department of Chemistry, The University of Texas at San Antonio , San Antonio, Texas 78249, United States
| | - James R Alleyn
- Department of Chemistry, The University of Texas at San Antonio , San Antonio, Texas 78249, United States
| | - Michael P Doyle
- Department of Chemistry, The University of Texas at San Antonio , San Antonio, Texas 78249, United States
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49
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Zhai XD, Yang ZD, Luo Z, Xu HT. Asymmetric catalyzed intramolecular aza-Michael reaction mediated by quinine-derived primary amines. CHINESE CHEM LETT 2017. [DOI: 10.1016/j.cclet.2017.04.017] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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50
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Auria-Luna F, Marqués-López E, Herrera RP. Organocatalytic Enantioselective Synthesis of 1,4-Dihydropyridines. Adv Synth Catal 2017. [DOI: 10.1002/adsc.201700300] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Affiliation(s)
- Fernando Auria-Luna
- Laboratorio de Organocatálisis Asimétrica, Departamento de Química Orgánica, Instituto de Síntesis Química y Catálisis Homogénea (ISQCH); CSIC-Universidad de Zaragoza; C/ Pedro Cerbuna 12 50009 Zaragoza Spain
| | - Eugenia Marqués-López
- Laboratorio de Organocatálisis Asimétrica, Departamento de Química Orgánica, Instituto de Síntesis Química y Catálisis Homogénea (ISQCH); CSIC-Universidad de Zaragoza; C/ Pedro Cerbuna 12 50009 Zaragoza Spain
| | - Raquel P. Herrera
- Laboratorio de Organocatálisis Asimétrica, Departamento de Química Orgánica, Instituto de Síntesis Química y Catálisis Homogénea (ISQCH); CSIC-Universidad de Zaragoza; C/ Pedro Cerbuna 12 50009 Zaragoza Spain
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