1
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Dhar T, Bera D, Chaudhuri T, Mukhopadhyay C. Metal and acid-free synthesis of acenaphthenone-2-ylidene ketones in PEG 400 and their radical nitration by TBN in water. Org Biomol Chem 2024; 22:8002-8009. [PMID: 39254654 DOI: 10.1039/d4ob00963k] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 09/11/2024]
Abstract
The synthesis of acenaphthenone-2-ylidene ketones has been developed using PEG 400 as a solvent under metal and acid-free conditions. Using TBN as a nitrating agent under atmospheric oxygen, nitration of acenaphthenone-2-ylidene ketones has been accomplished for the first time. Upon nitration, (E)-2-(2-oxo-2-phenylethylidene)acenaphthylen-1(2H)-one and alkyl (E)-2-(2-oxoacenaphthylen-1(2H)-ylidene)acetate give the diastereomer with the same geometry. The variety of substrates employed and low cost and non-toxicity of the chemicals used in this process demonstrate its important applicability. Another noteworthy aspect of the procedure is that, in contrast to previous procedures, it does not use HNO3 or metal nitrates during the transformation.
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Affiliation(s)
- Tiyasa Dhar
- Department of Chemistry, University of Calcutta, 92 APC Road, Kolkata-700009, India.
| | - Debasish Bera
- Department of Chemistry, University of Calcutta, 92 APC Road, Kolkata-700009, India.
| | - Tandrima Chaudhuri
- Department of Chemistry, Dr. Bhupendranath Dutta Smriti Mahavidyalaya, Burdwan 713407, India
| | - Chhanda Mukhopadhyay
- Department of Chemistry, University of Calcutta, 92 APC Road, Kolkata-700009, India.
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2
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Shan X, Gao P, Zhang S, Jia X, Yuan Y. 2,2′‐Azodi(2‐methylbutyronitrile) (AMBN) Promoted Alkenylation of Cyclic Ethers via Radical Addition to β‐Nitrostyrenes. ChemistrySelect 2022. [DOI: 10.1002/slct.202200425] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Xiaojie Shan
- College of Chemistry and Chemical Engineering Yangzhou University Yangzhou 225002, Jiangsu Province P. R. China
| | - Pan Gao
- College of Chemistry and Chemical Engineering Yangzhou University Yangzhou 225002, Jiangsu Province P. R. China
| | - Shuwei Zhang
- College of Chemistry and Chemical Engineering Yangzhou University Yangzhou 225002, Jiangsu Province P. R. China
| | - Xiaodong Jia
- College of Chemistry and Chemical Engineering Yangzhou University Yangzhou 225002, Jiangsu Province P. R. China
| | - Yu Yuan
- College of Chemistry and Chemical Engineering Yangzhou University Yangzhou 225002, Jiangsu Province P. R. China
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3
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Affiliation(s)
- Zeynep Dilşad Susam
- Department of Chemistry Middle East Technical University Dumlupınar Bulvarı, No. 1 06800 Çankaya, Ankara Turkey
| | - Cihangir Tanyeli
- Department of Chemistry Middle East Technical University Dumlupınar Bulvarı, No. 1 06800 Çankaya, Ankara Turkey
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4
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Ling T, Hadi V, Bollinger J, Rivas F. Identification of rapid access to polycyclic systems via a base-catalyzed cascade cyclization reaction and their biological evaluation. Bioorg Chem 2020; 99:103846. [PMID: 32334195 PMCID: PMC7329093 DOI: 10.1016/j.bioorg.2020.103846] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2020] [Revised: 04/08/2020] [Accepted: 04/09/2020] [Indexed: 11/23/2022]
Abstract
A base-mediated cascade reaction between malonate esters and acrolein was developed to access complex polycyclic systems. This novel tandem reaction enables the simultaneous generation of up to seven new bonds and at least three new stereogenic centers. Mechanistic studies indicate a series of nucleophilic 1,4 and 1,6 Michael addition reactions occur, followed by an aldol condensation reaction, culminating in the formation of three fused rings. The compounds were characterized by NMR studies and the stereochemistry was confirmed by X-ray analysis. The ability to generate multigram quantities of such complex molecular scaffolds renders the method promising for medicinal chemistry campaigns. Herein, we also demonstrate that the lead compounds display promising anti-proliferative activities against human cancer cell models.
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Affiliation(s)
- Taotao Ling
- Department of Chemical Biology and Therapeutics, St. Jude Children's Research Hospital, Memphis, TN 38105-3678, USA
| | - Victor Hadi
- Department of Chemical Biology and Therapeutics, St. Jude Children's Research Hospital, Memphis, TN 38105-3678, USA
| | - John Bollinger
- Department of Structural Biology, St. Jude Children's Research Hospital, Memphis, TN 38105-3678, USA
| | - Fatima Rivas
- Department of Chemical Biology and Therapeutics, St. Jude Children's Research Hospital, Memphis, TN 38105-3678, USA.
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5
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Parvin T, Yadav R, Choudhury LH. Recent applications of thiourea-based organocatalysts in asymmetric multicomponent reactions (AMCRs). Org Biomol Chem 2020; 18:5513-5532. [DOI: 10.1039/d0ob00595a] [Citation(s) in RCA: 50] [Impact Index Per Article: 12.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Abstract
This review describes the recent applications of thiourea-based organocatalysts in asymmetric multicomponent reactions.
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Affiliation(s)
- Tasneem Parvin
- Department of Chemistry
- National Institute of Technology Patna
- Patna – 800005
- India
| | - Rahul Yadav
- Department of Chemistry
- National Institute of Technology Patna
- Patna – 800005
- India
| | - Lokman H. Choudhury
- Department of Chemistry
- Indian Institute of Technology Patna
- Patna – 801106
- India
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6
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Ipso-nitration of carboxylic acids using a mixture of nitronium tetrafluoroborate, base and 1-hexyl-3,4,5-trimethyl-1H-imidazolium tetrafluoroborate. Tetrahedron Lett 2019. [DOI: 10.1016/j.tetlet.2019.05.057] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
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7
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Ambala S, Singh R, Singh M, Cham PS, Gupta R, Munagala G, Yempalla KR, Vishwakarma RA, Singh PP. Metal-free, room temperature, acid-K2S2O8 mediated method for the nitration of olefins: an easy approach for the synthesis of nitroolefins. RSC Adv 2019; 9:30428-30431. [PMID: 35530202 PMCID: PMC9072150 DOI: 10.1039/c9ra06414a] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2019] [Accepted: 09/05/2019] [Indexed: 12/24/2022] Open
Abstract
Here, we have developed a simple, room temperature method for the nitration of olefins by using inexpensive sodium nitrite as a source of nitro groups in the presence of trifluoroacetic acid (TFA) and potassium persulfate (K2S2O8) under an open atmosphere. Styrenes and mono-substituted olefins give stereo-selective corresponding E-nitroolefins under optimized conditions, however, 1,1-bisubstituted olefins give a mixture of E- and Z-nitroolefins. The optimized conditions work well with electron-donating, electron-withdrawing, un-substituted and heterocyclic styrenes and mono-substituted olefins and give corresponding nitroolefins with good to excellent yields. Here, we have developed a simple, room temperature method for the nitration of olefins by using inexpensive sodium nitrite as a source of nitro groups in the presence of TFA and potassium persulphate under an open atmosphere.![]()
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Affiliation(s)
- Srinivas Ambala
- Medicinal Chemistry Division
- CSIR-Indian Institute of Integrative Medicine
- India
- Academy of Scientific and Innovative Research
- India
| | - Rohit Singh
- Medicinal Chemistry Division
- CSIR-Indian Institute of Integrative Medicine
- India
- Academy of Scientific and Innovative Research
- India
| | - Maninder Singh
- Medicinal Chemistry Division
- CSIR-Indian Institute of Integrative Medicine
- India
| | - Pankaj Singh Cham
- Medicinal Chemistry Division
- CSIR-Indian Institute of Integrative Medicine
- India
| | - Ria Gupta
- Medicinal Chemistry Division
- CSIR-Indian Institute of Integrative Medicine
- India
- Academy of Scientific and Innovative Research
- India
| | - Gurunadham Munagala
- Medicinal Chemistry Division
- CSIR-Indian Institute of Integrative Medicine
- India
- Academy of Scientific and Innovative Research
- India
| | - Kushalava Reddy Yempalla
- Medicinal Chemistry Division
- CSIR-Indian Institute of Integrative Medicine
- India
- Academy of Scientific and Innovative Research
- India
| | - Ram A. Vishwakarma
- Medicinal Chemistry Division
- CSIR-Indian Institute of Integrative Medicine
- India
- Academy of Scientific and Innovative Research
- India
| | - Parvinder Pal Singh
- Medicinal Chemistry Division
- CSIR-Indian Institute of Integrative Medicine
- India
- Academy of Scientific and Innovative Research
- India
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8
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Mir BA, Singh SJ, Kumar R, Patel BK. tert-
Butyl Nitrite Mediated Different Functionalizations of Internal Alkenes: Paths to Furoxans and Nitroalkenes. Adv Synth Catal 2018. [DOI: 10.1002/adsc.201800668] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Bilal Ahmad Mir
- Department of Chemistry; Indian Institute of Technology Guwahati, North Guwahati; 781 039 Assam India
| | | | - Ritush Kumar
- Department of Chemistry; Indian Institute of Technology Guwahati, North Guwahati; 781 039 Assam India
| | - Bhisma K. Patel
- Department of Chemistry; Indian Institute of Technology Guwahati, North Guwahati; 781 039 Assam India
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9
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Li X, Guo L, Peng C, Han B. Organocatalytic Asymmetric Cascade Reactions Based on Gamma-Nitro Carbonyl Compound. CHEM REC 2018; 19:394-423. [PMID: 30019511 DOI: 10.1002/tcr.201800047] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2018] [Accepted: 06/19/2018] [Indexed: 12/11/2022]
Abstract
The significant advancements in asymmetric organocascade reactions have been accomplished during the past decades, paving the way to the efficient and stereoselective construction of structurally complex scaffolds from simple and readily available starting materials. Nitro-containing cyclic compounds have become a privileged molecular library given their broad and promising activities in various therapeutic areas. In various approaches to build these valuable scaffolds, the utility of γ-nitrocarbonyl intermediates is one of the most efficient approaches due to its high efficiency, reliability and versatility. The strategies and catalyst systems described here highlight recent advances in the enantioselective synthesis of nitro-containing cyclic molecules via organocascade strategies based on γ-nitrocarbonyl intermediates. Various organocatalysts with distinct activation modes have found application in providing these sophisticated compounds. This review is organized according to the types of organocatalyst. These methods are of importance for the construction of complex chiral cyclic frameworks and the design of new pharmaceutical compounds. We believe that compounds based on nitro-containing cyclic skeletons have the potential to provide novel therapeutic agents and useful biological tools.
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Affiliation(s)
- Xiang Li
- State Key Laboratory Breeding Base of Systematic Research, Development and Utilization of Chinese Medicine Resources, Chengdu University of Traditional Chinese Medicine, Chengdu, China
| | - Li Guo
- Ministry of Education Key Laboratory of Standardization of Chinese Medicine, School of Pharmacy, Chengdu University of Traditional Chinese Medicine, Chengdu, China
| | - Cheng Peng
- State Key Laboratory Breeding Base of Systematic Research, Development and Utilization of Chinese Medicine Resources, Chengdu University of Traditional Chinese Medicine, Chengdu, China.,Ministry of Education Key Laboratory of Standardization of Chinese Medicine, School of Pharmacy, Chengdu University of Traditional Chinese Medicine, Chengdu, China
| | - Bo Han
- State Key Laboratory Breeding Base of Systematic Research, Development and Utilization of Chinese Medicine Resources, Chengdu University of Traditional Chinese Medicine, Chengdu, China
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10
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Tripathi S, Kapoor R, Yadav LDS. Visible Light Activated Radical Denitrative Benzoylation of β
-Nitrostyrenes: A Photocatalytic Approach to Chalcones. Adv Synth Catal 2018. [DOI: 10.1002/adsc.201701559] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Affiliation(s)
- Shubhangi Tripathi
- Green Synthesis Lab; Department of Chemistry; University of Allahabad; Allahabad 211002 India
| | - Ritu Kapoor
- Green Synthesis Lab; Department of Chemistry; University of Allahabad; Allahabad 211002 India
| | - Lal Dhar S. Yadav
- Green Synthesis Lab; Department of Chemistry; University of Allahabad; Allahabad 211002 India
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11
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Vetica F, Chauhan P, Dochain S, Enders D. Asymmetric organocatalytic methods for the synthesis of tetrahydropyrans and their application in total synthesis. Chem Soc Rev 2018; 46:1661-1674. [PMID: 28262863 DOI: 10.1039/c6cs00757k] [Citation(s) in RCA: 82] [Impact Index Per Article: 13.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Recent advancement in the area of asymmetric organocatalysis led to the development of new methodologies for the construction of valuable enantiopure molecules, including various heterocycles. As one of the latter class of compounds tetrahydropyrans (THPs) constitute a core structure of a wide array of bioactive natural products. A noticeable growth has been observed in the asymmetric synthesis of THPs using small organic molecules as catalysts. This Tutorial Review describes the organocatalytic methods available to furnish THPs as well as the application of these methodologies in the total synthesis of THP-based natural products.
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Affiliation(s)
- Fabrizio Vetica
- Institute of Organic Chemistry, RWTH Aachen University, Landoltweg 1, 52074 Aachen, Germany.
| | - Pankaj Chauhan
- Institute of Organic Chemistry, RWTH Aachen University, Landoltweg 1, 52074 Aachen, Germany.
| | - Simon Dochain
- Institute of Organic Chemistry, RWTH Aachen University, Landoltweg 1, 52074 Aachen, Germany.
| | - Dieter Enders
- Institute of Organic Chemistry, RWTH Aachen University, Landoltweg 1, 52074 Aachen, Germany.
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12
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Belot V, Farran D, Jean M, Albalat M, Vanthuyne N, Roussel C. Steric Scale of Common Substituents from Rotational Barriers of N-(o-Substituted aryl)thiazoline-2-thione Atropisomers. J Org Chem 2017; 82:10188-10200. [DOI: 10.1021/acs.joc.7b01698] [Citation(s) in RCA: 39] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Vincent Belot
- Aix Marseille Univ, CNRS, Centrale Marseille,
iSm2, Marseille, France
| | - Daniel Farran
- Aix Marseille Univ, CNRS, Centrale Marseille,
iSm2, Marseille, France
| | - Marion Jean
- Aix Marseille Univ, CNRS, Centrale Marseille,
iSm2, Marseille, France
| | - Muriel Albalat
- Aix Marseille Univ, CNRS, Centrale Marseille,
iSm2, Marseille, France
| | - Nicolas Vanthuyne
- Aix Marseille Univ, CNRS, Centrale Marseille,
iSm2, Marseille, France
| | - Christian Roussel
- Aix Marseille Univ, CNRS, Centrale Marseille,
iSm2, Marseille, France
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13
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Daniel PE, Weber AE, Malcolmson SJ. Umpolung Synthesis of 1,3-Amino Alcohols: Stereoselective Addition of 2-Azaallyl Anions to Epoxides. Org Lett 2017; 19:3490-3493. [PMID: 28656772 DOI: 10.1021/acs.orglett.7b01471] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
We report the direct preparation of 1,3-amino alcohols that contain up to three contiguous stereogenic centers by the umpolung coupling of imines and epoxides. Nucleophilic 2-azaallyl anions, generated from imines, are stereoselectively added to epoxides to furnish 1,3-amino alcohols after hydrolysis of the product imine. Transformations afford amino alcohols with >98% site selectivity with respect to both reaction partners and in up to >98% yield and >20:1 dr.
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Affiliation(s)
- Paige E Daniel
- Department of Chemistry, Duke University , Durham, North Carolina 27708, United States
| | - Alexandria E Weber
- Department of Chemistry, Duke University , Durham, North Carolina 27708, United States
| | - Steven J Malcolmson
- Department of Chemistry, Duke University , Durham, North Carolina 27708, United States
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14
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Huang WY, Anwar S, Chen K. Morita-Baylis-Hillman (MBH) Reaction Derived Nitroallylic Alcohols, Acetates and Amines as Synthons in Organocatalysis and Heterocycle Synthesis. CHEM REC 2016; 17:363-381. [DOI: 10.1002/tcr.201600075] [Citation(s) in RCA: 40] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2016] [Indexed: 02/01/2023]
Affiliation(s)
- Wan-Yun Huang
- Department of Chemistry; National Taiwan Normal University; Taipei Taiwan 116 (ROC)
| | - Shaik Anwar
- Division of Chemistry; Department of Science and Humanities; Vignan's Foundation for Science; Technology and Research University-VFSTRU; (Vignan University) Vadlamudi; Guntur 522 213 Andhra Pradesh India
| | - Kwunmin Chen
- Department of Chemistry; National Taiwan Normal University; Taipei Taiwan 116 (ROC)
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15
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Zhang N, Quan ZJ, Wang XC. Nickel-Catalyzed Denitrated Coupling Reaction of Nitroalkenes with Aliphatic and Aromatic Alkenes. Adv Synth Catal 2016. [DOI: 10.1002/adsc.201600586] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Affiliation(s)
- Na Zhang
- College of Chemistry and Chemical Engineering; Northwest Normal University, Lanzhou; Gansu 730070 People's Republic of China
| | - Zheng-Jun Quan
- College of Chemistry and Chemical Engineering; Northwest Normal University, Lanzhou; Gansu 730070 People's Republic of China
| | - Xi-Cun Wang
- College of Chemistry and Chemical Engineering; Northwest Normal University, Lanzhou; Gansu 730070 People's Republic of China
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16
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Sekikawa T, Kitaguchi T, Kitaura H, Minami T, Hatanaka Y. Anti-Selective Asymmetric Nitro-Michael Reaction of Furanones: Diastereocontrol by Catalyst. Org Lett 2016; 18:646-9. [DOI: 10.1021/acs.orglett.5b03539] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Affiliation(s)
- Tohru Sekikawa
- Department
of Applied Chemistry,
Graduate School of Engineering, Osaka City University, Sumiyoshi, Osaka 558-8585, Japan
| | - Takayuki Kitaguchi
- Department
of Applied Chemistry,
Graduate School of Engineering, Osaka City University, Sumiyoshi, Osaka 558-8585, Japan
| | - Hayato Kitaura
- Department
of Applied Chemistry,
Graduate School of Engineering, Osaka City University, Sumiyoshi, Osaka 558-8585, Japan
| | - Tatsuya Minami
- Department
of Applied Chemistry,
Graduate School of Engineering, Osaka City University, Sumiyoshi, Osaka 558-8585, Japan
| | - Yasuo Hatanaka
- Department
of Applied Chemistry,
Graduate School of Engineering, Osaka City University, Sumiyoshi, Osaka 558-8585, Japan
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17
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Abstract
The one-pot synthesis of a target molecule in the same reaction vessel is widely considered to be an efficient approach in synthetic organic chemistry. In this review, the characteristics and limitations of various one-pot syntheses of biologically active molecules are explained, primarily involving organocatalytic methods as key tactics. Besides catalysis, the pot-economy concepts presented herein are also applicable to organometallic and organic reaction methods in general.
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Affiliation(s)
- Yujiro Hayashi
- Department of Chemistry , Graduate School of Science , Tohoku University , 6-3 Aramaki-Aza Aoba, Aoba-ku , Sendai 980-8578 , Japan . ; ; Tel: +81-22-795-3554
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18
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Poomathi N, Perumal PT. Cinchona alkaloid and di-tert-butyldicarbonate–DMAP promoted efficient synthesis of (E)-nitroolefins. RSC Adv 2016. [DOI: 10.1039/c6ra06644e] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
A simple and efficient metal-free methodology for the synthesis of β-nitroolefins has been developed from arylidinemalononitrile using bifunctional cinchona alkaloid along with di-tert-butyldicarbonate–DMAP in high yields with total selectivity.
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Affiliation(s)
- Nataraj Poomathi
- Organic Chemistry Division
- CSIR-Central Leather Research Institute
- Chennai-600020
- India
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19
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Zhang N, Quan ZJ, Zhang Z, Da YX, Wang XC. Synthesis of stilbene derivatives via visible-light-induced cross-coupling of aryl diazonium salts with nitroalkenes using –NO2 as a leaving group. Chem Commun (Camb) 2016; 52:14234-14237. [DOI: 10.1039/c6cc08182g] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Photocatalytic coupling of nitroalkenes with diazonium salts.
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Affiliation(s)
- Na Zhang
- Key Laboratory of Polymer Materials
- College of Chemistry and Chemical Engineering
- Northwest Normal University
- Lanzhou
- P. R. China
| | - Zheng-Jun Quan
- Key Laboratory of Polymer Materials
- College of Chemistry and Chemical Engineering
- Northwest Normal University
- Lanzhou
- P. R. China
| | - Zhang Zhang
- Key Laboratory of Polymer Materials
- College of Chemistry and Chemical Engineering
- Northwest Normal University
- Lanzhou
- P. R. China
| | - Yu-Xia Da
- Key Laboratory of Polymer Materials
- College of Chemistry and Chemical Engineering
- Northwest Normal University
- Lanzhou
- P. R. China
| | - Xi-Cun Wang
- Key Laboratory of Polymer Materials
- College of Chemistry and Chemical Engineering
- Northwest Normal University
- Lanzhou
- P. R. China
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20
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Kim SM, Kim YS, Kim DW, Rios R, Yang JW. Acetaldehyde: A Small Organic Molecule with Big Impact on Organocatalytic Reactions. Chemistry 2015; 22:2214-34. [PMID: 26667963 DOI: 10.1002/chem.201503960] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2015] [Indexed: 11/11/2022]
Abstract
Stereocontrolled formation of carbon-carbon and carbon-heteroatom bonds through asymmetric organocatalysis is a formidable challenge for modern synthetic chemistry. Among the most significant contributions to this field are the transformations involving the use of acetaldehyde or α-heteroatom-substituted acetaldehydes for constructing valuable synthons (e.g., amino acid derivatives and hydroxycarbonyl). In this Minireview, versatile (enantioselective) organocatalytic transformations are discussed.
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Affiliation(s)
- Sun Min Kim
- Department of Energy Science, Sungkyunkwan University, 2066 Seobu-ro, Jangan-gu, Suwon, Gyeonggi-do, 440-746, Korea
| | - Young Sug Kim
- Department of Energy Science, Sungkyunkwan University, 2066 Seobu-ro, Jangan-gu, Suwon, Gyeonggi-do, 440-746, Korea
| | - Dong Wan Kim
- Department of Energy Science, Sungkyunkwan University, 2066 Seobu-ro, Jangan-gu, Suwon, Gyeonggi-do, 440-746, Korea
| | - Ramon Rios
- Faculty of Natural and Environmental Science, University of Southampton, Highfield Campus, Southampton, SO17 1BJ, UK.
| | - Jung Woon Yang
- Department of Energy Science, Sungkyunkwan University, 2066 Seobu-ro, Jangan-gu, Suwon, Gyeonggi-do, 440-746, Korea.
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21
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Gurubrahamam R, Cheng YS, Huang WY, Chen K. Recent Advances in Organocatalytic Kinetic Resolution for the Synthesis of Functionalized Products. ChemCatChem 2015. [DOI: 10.1002/cctc.201500455] [Citation(s) in RCA: 41] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Affiliation(s)
- Ramani Gurubrahamam
- Department of Chemistry; National Taiwan Normal University; Taipei Taiwan 116 R.O. China
| | - You-Song Cheng
- Department of Chemistry; National Taiwan Normal University; Taipei Taiwan 116 R.O. China
| | - Wan-Yun Huang
- Department of Chemistry; National Taiwan Normal University; Taipei Taiwan 116 R.O. China
| | - Kwunmin Chen
- Department of Chemistry; National Taiwan Normal University; Taipei Taiwan 116 R.O. China
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22
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Varga S, Jakab G, Csámpai A, Soós T. Iterative Coupling of Two Different Enones by Nitromethane Using Bifunctional Thiourea Organocatalysts. Stereocontrolled Assembly of Cyclic and Acyclic Structures. J Org Chem 2015; 80:8990-6. [DOI: 10.1021/acs.joc.5b01474] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Affiliation(s)
- Szilárd Varga
- Institute
of Organic Chemistry, Research Centre for Natural Sciences, HAS, P.O. Box 286, Budapest, H-1519, Hungary
| | - Gergely Jakab
- Institute
of Organic Chemistry, Research Centre for Natural Sciences, HAS, P.O. Box 286, Budapest, H-1519, Hungary
| | - Antal Csámpai
- Institute
of Chemistry, Department of Inorganic Chemistry, L. Eötvös University, Pázmány Péter sétány 1/A, Budapest H-1117, Hungary
| | - Tibor Soós
- Institute
of Organic Chemistry, Research Centre for Natural Sciences, HAS, P.O. Box 286, Budapest, H-1519, Hungary
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23
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Kenny R, Liu F. Trifunctional Organocatalysts: Catalytic Proficiency by Cooperative Activation. European J Org Chem 2015. [DOI: 10.1002/ejoc.201500179] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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24
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Gurubrahamam R, Cheng YS, Chen K. Control of Five Contiguous Stereogenic Centers in an Organocatalytic Kinetic Resolution via Michael/Acetalization Sequence: Synthesis of Fully Substituted Tetrahydropyranols. Org Lett 2015; 17:430-3. [DOI: 10.1021/ol5033656] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Affiliation(s)
- Ramani Gurubrahamam
- Department of Chemistry, National Taiwan Normal University, Taipei 11677, Taiwan
| | - You-Song Cheng
- Department of Chemistry, National Taiwan Normal University, Taipei 11677, Taiwan
| | - Kwunmin Chen
- Department of Chemistry, National Taiwan Normal University, Taipei 11677, Taiwan
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25
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Halimehjani AZ, Namboothiri INN, Hooshmand SE. Part II: nitroalkenes in the synthesis of heterocyclic compounds. RSC Adv 2014. [DOI: 10.1039/c4ra08830a] [Citation(s) in RCA: 51] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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26
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Hlekhlai S, Samakkanad N, Sawangphon T, Pohmakotr M, Reutrakul V, Soorukram D, Jaipetch T, Kuhakarn C. Oxone®/KI-Mediated Nitration of Alkenes and Alkynes: Synthesis of Nitro- and β-Iodonitro-Substituted Alkenes. European J Org Chem 2014. [DOI: 10.1002/ejoc.201402750] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
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27
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Loh CCJ, Chauhan P, Hack D, Lehmann C, Enders D. Rapid Asymmetric Synthesis of Highly Functionalized Indanolsviaa Michael/Henry Organocascade with Submol% Squaramide Catalyst Loadings. Adv Synth Catal 2014. [DOI: 10.1002/adsc.201400499] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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28
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Hahn R, Raabe G, Enders D. Asymmetric synthesis of highly functionalized tetrahydropyrans via a one-pot organocatalytic Michael/Henry/ketalization sequence. Org Lett 2014; 16:3636-9. [PMID: 24971998 PMCID: PMC4700516 DOI: 10.1021/ol501236a] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
A diastereo- and enantioselective Michael/Henry/ketalization sequence to functionalized tetrahydropyrans is described. The multicomponent cascade reaction uses acetylacetone or β-keto esters, β-nitrostyrenes, and alkynyl aldehydes as substrates affording tetrahydropyrans with five contiguous stereocenters. Employing a bifunctional quinine-based squaramide organocatalyst, the title compounds are obtained in moderate to good yields (27-80%), excellent enantiomeric excesses (93-99% ee), and high diastereomeric ratios (dr > 20:1) after one crystallization.
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Affiliation(s)
- Robert Hahn
- Institute of Organic Chemistry, RWTH Aachen University, Landoltweg 1, 52074 Aachen, Germany
| | - Gerhard Raabe
- Institute of Organic Chemistry, RWTH Aachen University, Landoltweg 1, 52074 Aachen, Germany
| | - Dieter Enders
- Institute of Organic Chemistry, RWTH Aachen University, Landoltweg 1, 52074 Aachen, Germany
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29
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Zhang Y, Vongvilai P, Sakulsombat M, Fischer A, Ramström O. Asymmetric Synthesis of Substituted Thiolanes through Domino Thia-Michael-Henry Dynamic Covalent Systemic Resolution using Lipase Catalysis. Adv Synth Catal 2014; 356:987-992. [PMID: 26190961 PMCID: PMC4498465 DOI: 10.1002/adsc.201301033] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/19/2013] [Revised: 01/15/2014] [Indexed: 12/12/2022]
Abstract
Dynamic systems based on consecutive thia-Michael and Henry reactions were generated and transformed using lipase-catalyzed asymmetric transformation. Substituted thiolane structures with three contiguous stereocenters were resolved in the process in high yields and high enantiomeric excesses.
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Affiliation(s)
- Yan Zhang
- Department of Chemistry, KTH Royal Institute of Technology Teknikringen 30, S-10044 Stockholm, Sweden E-mail:
| | - Pornrapee Vongvilai
- Department of Chemistry, KTH Royal Institute of Technology Teknikringen 30, S-10044 Stockholm, Sweden E-mail:
| | - Morakot Sakulsombat
- Department of Chemistry, KTH Royal Institute of Technology Teknikringen 30, S-10044 Stockholm, Sweden E-mail:
| | - Andreas Fischer
- Department of Chemistry, KTH Royal Institute of Technology Teknikringen 30, S-10044 Stockholm, Sweden E-mail:
| | - Olof Ramström
- Department of Chemistry, KTH Royal Institute of Technology Teknikringen 30, S-10044 Stockholm, Sweden E-mail:
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30
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Yan G, Borah AJ, Wang L. Recent advances in the synthesis of nitroolefin compounds. Org Biomol Chem 2014; 12:6049-58. [DOI: 10.1039/c4ob00573b] [Citation(s) in RCA: 55] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
This review focuses on recent achievements in nitroolefin synthesis and the mechanisms of the reactions are also discussed.
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Affiliation(s)
- Guobing Yan
- Department of Chemistry
- Lishui University
- Lishui City 323000, P. R. China
| | - Arun Jyoti Borah
- Department of Chemistry
- Lishui University
- Lishui City 323000, P. R. China
| | - Lianggui Wang
- Department of Chemistry
- Lishui University
- Lishui City 323000, P. R. China
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31
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Volla CMR, Atodiresei I, Rueping M. Catalytic C-C bond-forming multi-component cascade or domino reactions: pushing the boundaries of complexity in asymmetric organocatalysis. Chem Rev 2013; 114:2390-431. [PMID: 24304297 DOI: 10.1021/cr400215u] [Citation(s) in RCA: 875] [Impact Index Per Article: 79.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Affiliation(s)
- Chandra M R Volla
- Institute of Organic Chemistry, RWTH Aachen University , Landoltweg 1, 52074 Aachen, Germany
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32
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Loh CCJ, Hack D, Enders D. Asymmetric domino synthesis of indanes bearing four contiguous stereocentres catalyzed by sub-mol% loadings of a squaramide in minutes. Chem Commun (Camb) 2013; 49:10230-2. [PMID: 24064746 PMCID: PMC4169095 DOI: 10.1039/c3cc46033a] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
An efficient diastereo- and enantioselective synthesis of polyfunctionalized indanes bearing four contiguous stereogenic centres in generally very short reaction times and sub-mol% squaramide catalyst loadings has been developed. The novel methodology creates a maximum of two stereocentres per bond formation via an organocatalytic Michael-Henry domino reaction.
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Affiliation(s)
- Charles C J Loh
- Institute of Organic Chemistry, RWTH Aachen University, Landoltweg 1, 52074 Aachen, Germany.
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33
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Scheffler U, Mahrwald R. Recent Advances in Organocatalytic Methods for Asymmetric CC Bond Formation. Chemistry 2013; 19:14346-96. [DOI: 10.1002/chem.201301996] [Citation(s) in RCA: 178] [Impact Index Per Article: 16.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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34
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35
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Arylation of Diazoesters by a Transient NH Insertion Organocascade. Angew Chem Int Ed Engl 2013; 52:11317-20. [DOI: 10.1002/anie.201304921] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2013] [Revised: 07/12/2013] [Indexed: 12/20/2022]
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36
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Loh CCJ, Atodiresei I, Enders D. Asymmetric Organocatalytic Michael/Henry Domino Reactions through Hydrogen-Bond Activation: Kinetic Access to Indane Scaffolds Bearingcis-Vicinal Substituents. Chemistry 2013; 19:10822-6. [DOI: 10.1002/chem.201302131] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2013] [Indexed: 12/22/2022]
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37
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Maity S, Naveen T, Sharma U, Maiti D. Stereoselective Nitration of Olefins with tBuONO and TEMPO: Direct Access to Nitroolefins under Metal-free Conditions. Org Lett 2013; 15:3384-7. [DOI: 10.1021/ol401426p] [Citation(s) in RCA: 160] [Impact Index Per Article: 14.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Affiliation(s)
- Soham Maity
- Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai-400 076, India
| | - Togati Naveen
- Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai-400 076, India
| | - Upendra Sharma
- Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai-400 076, India
| | - Debabrata Maiti
- Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai-400 076, India
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38
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Quintavalla A, Lombardo M, Sanap SP, Trombini C. A New Henry/Michael/Retro-Henry/Henry Domino Sequence Promoted by Bifunctional Organocatalysts. Adv Synth Catal 2013. [DOI: 10.1002/adsc.201201135] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
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39
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Jaiswal PK, Biswas S, Singh S, Pathak B, Mobin SM, Samanta S. Stereoselective synthesis of highly functionalized tetrahydrocarbazoles through a domino Michael–Henry reaction: an easy access to four contiguous chiral centers. RSC Adv 2013. [DOI: 10.1039/c3ra41409d] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022] Open
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40
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Lin H, Tan Y, Liu WJ, Zhang ZC, Sun XW, Lin GQ. A highly efficient access to enantiopure tetrahydropyridines: dual-organocatalyst-promoted asymmetric cascade reaction. Chem Commun (Camb) 2013; 49:4024-6. [DOI: 10.1039/c3cc40690c] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
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41
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Tsakos M, Elsegood MRJ, Kokotos CG. Organocatalytic asymmetric domino Michael–Henry reaction for the synthesis of substituted bicyclo[3.2.1]octan-2-ones. Chem Commun (Camb) 2013; 49:2219-21. [DOI: 10.1039/c3cc39165e] [Citation(s) in RCA: 52] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
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42
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Hong BC, Dange NS, Yen PJ, Lee GH, Liao JH. Organocatalytic Asymmetric Anti-Selective Michael Reactions of Aldehydes and the Sequential Reduction/Lactonization/Pauson–Khand Reaction for the Enantioselective Synthesis of Highly Functionalized Hydropentalenes. Org Lett 2012; 14:5346-9. [DOI: 10.1021/ol302527z] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Affiliation(s)
- Bor-Cherng Hong
- Department of Chemistry and Biochemistry, National Chung Cheng University, Chia-Yi, 621, Taiwan, R.O.C., and Instrumentation Center, National Taiwan University, Taipei, 106, Taiwan, R.O.C
| | - Nitin S. Dange
- Department of Chemistry and Biochemistry, National Chung Cheng University, Chia-Yi, 621, Taiwan, R.O.C., and Instrumentation Center, National Taiwan University, Taipei, 106, Taiwan, R.O.C
| | - Po-Jen Yen
- Department of Chemistry and Biochemistry, National Chung Cheng University, Chia-Yi, 621, Taiwan, R.O.C., and Instrumentation Center, National Taiwan University, Taipei, 106, Taiwan, R.O.C
| | - Gene-Hsiang Lee
- Department of Chemistry and Biochemistry, National Chung Cheng University, Chia-Yi, 621, Taiwan, R.O.C., and Instrumentation Center, National Taiwan University, Taipei, 106, Taiwan, R.O.C
| | - Ju-Hsiou Liao
- Department of Chemistry and Biochemistry, National Chung Cheng University, Chia-Yi, 621, Taiwan, R.O.C., and Instrumentation Center, National Taiwan University, Taipei, 106, Taiwan, R.O.C
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43
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Jensen KL, Weise CF, Dickmeiss G, Morana F, Davis RL, Jørgensen KA. Selective access to both diastereoisomers in an enantioselective intramolecular Michael reaction by using a single chiral organocatalyst and application in the formal total synthesis of (-)-epibatidine. Chemistry 2012; 18:11913-8. [PMID: 22907652 DOI: 10.1002/chem.201202353] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2012] [Indexed: 11/11/2022]
Abstract
Two in one: Both diastereoisomers of 4-nitro-3-substituted cyclohexanones are accessed selectively by an intramolecular Michael reaction using a single chiral aminocatalyst (see scheme). Mechanistic studies show that the reaction is selective for the cis-diastereoisomer and that the trans-diastereoisomer arises over time. DFT calculations suggest that the cis-selectivity is due to a favorable electrostatic interaction between the iminium ion and the nucleophile.
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Affiliation(s)
- Kim L Jensen
- Center for Catalysis, Department of Chemistry, Aarhus University, 8000 Aarhus C, Denmark
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44
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Zhu HL, Ling JB, Xu PF. α-Oxo-γ-Butyrolactam, N-Containing Pronucleophile in Organocatalytic One-Pot Assembly of Butyrolactam-Fused Indoloquinolizidines. J Org Chem 2012; 77:7737-43. [DOI: 10.1021/jo301192d] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Hai-Liang Zhu
- State Key
Laboratory of Applied Organic Chemistry,
College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou 730000, P. R. China
| | - Jun-Bing Ling
- State Key
Laboratory of Applied Organic Chemistry,
College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou 730000, P. R. China
| | - Peng-Fei Xu
- State Key
Laboratory of Applied Organic Chemistry,
College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou 730000, P. R. China
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45
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Dudziński K, Pakulska AM, Kwiatkowski P. An Efficient Organocatalytic Method for Highly Enantioselective Michael Addition of Malonates to Enones Catalyzed by Readily Accessible Primary Amine-Thiourea. Org Lett 2012; 14:4222-5. [DOI: 10.1021/ol3019055] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Krzysztof Dudziński
- Faculty of Chemistry, University of Warsaw, Pasteura 1, 02-093 Warsaw, Poland
| | - Anna M. Pakulska
- Faculty of Chemistry, University of Warsaw, Pasteura 1, 02-093 Warsaw, Poland
| | - Piotr Kwiatkowski
- Faculty of Chemistry, University of Warsaw, Pasteura 1, 02-093 Warsaw, Poland
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46
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Hong BC, Chen PY, Kotame P, Lu PY, Lee GH, Liao JH. Organocatalyzed Michael-Henry reactions: enantioselective synthesis of cyclopentanecarbaldehydes via the dienamine organocatalysis of a succinaldehyde surrogate. Chem Commun (Camb) 2012; 48:7790-2. [PMID: 22714728 DOI: 10.1039/c2cc33309k] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Asymmetric formal [3+2] cycloadditions of 4-hydroxybut-2-enal, a succinaldehyde surrogate, and nitroalkenes with an organocatalyst provided cyclopentanecarbaldehydes containing four consecutive stereogenic centers with excellent enantioselectivities.
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Affiliation(s)
- Bor-Cherng Hong
- Department of Chemistry and Biochemistry, National Chung Cheng University, Chia-Yi 621, Taiwan, R.O.C.
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47
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Mao Z, Jia Y, Xu Z, Wang R. Asymmetric Organocatalytic Cascade Michael/Michael/Henry Reaction Sequence: Control of All Stereocenters in One Cyclohexane Skeleton. Adv Synth Catal 2012. [DOI: 10.1002/adsc.201200008] [Citation(s) in RCA: 44] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
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48
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Ramachary DB, Madhavachary R, Prasad MS. Observation of neighboring ortho-hydroxyl group participation in organocatalytic asymmetric sequential Michael-lactonization reactions: synthesis of highly substituted chiral spirodihydrocoumarins. Org Biomol Chem 2012; 10:5825-9. [PMID: 22391626 DOI: 10.1039/c2ob07122c] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
A general approach to asymmetric synthesis of highly substituted spirodihydrocoumarins with a quaternary stereocenter was achieved through neighboring ortho-hydroxyl group induced sequential Michael-lactonization reactions on 2-(2-nitrovinyl)phenols with alkyl cyclopentanone-2-carboxylates in the presence of a catalytic amount of quinine-NH-thiourea followed by p-TSA.
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49
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Tsakos M, Kokotos CG, Kokotos G. Primary Amine-Thioureas with Improved Catalytic Properties for “Difficult” Michael Reactions: Efficient Organocatalytic Syntheses of (S)-Baclofen, (R)-Baclofen and (S)-Phenibut. Adv Synth Catal 2012. [DOI: 10.1002/adsc.201100636] [Citation(s) in RCA: 57] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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50
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Nugent TC, Sadiq A, Bibi A, Heine T, Zeonjuk LL, Vankova N, Bassil BS. Noncovalent Bifunctional Organocatalysts: Powerful Tools for Contiguous Quaternary-Tertiary Stereogenic Carbon Formation, Scope, and Origin of Enantioselectivity. Chemistry 2012; 18:4088-98. [DOI: 10.1002/chem.201103005] [Citation(s) in RCA: 81] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2011] [Indexed: 11/09/2022]
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