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Kaur C, Sharma S, Thakur A, Sharma R. ASYMMETRIC SYNTHESIS: A GLANCE AT VARIOUS METHODOLOGIES FOR DIFFERENT FRAMEWORKS. CURR ORG CHEM 2022. [DOI: 10.2174/1385272826666220610162605] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Abstract:
Asymmetric reactions have made a significant advancement over the past few decades and involved the production of enantiomerically pure molecules using enantioselective organocatalysis, chiral auxiliaries/substrates, and reagents via controlling the absolute stereochemistry. The laboratory synthesis from an enantiomerically impure starting material gives a combination of enantiomers which are difficult to separate for chemists in the fields of medicine, chromatography, pharmacology, asymmetric synthesis, studies of structure-function relationships of proteins, life sciences and mechanistic studies. This challenging step of separation can be avoided by the use of asymmetric synthesis. Using pharmacologically relevant scaffolds/pharmacophores, the drug designing can also be achieved using asymmetric synthesis to synthesize receptor specific pharmacologically active chiral molecules. This approach can be used to synthesize asymmetric molecules from wide variety of reactants using specific asymmetric conditions which is also beneficial for environment due to less usage and discharge of chemicals into the environment. So, in this review, we have focused on the inclusive collation of diverse mechanisms in this area, to encourage auxiliary studies of asymmetric reactions to develop selective, efficient, environment-friendly and high yielding advanced processes in asymmetric reactions.
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Affiliation(s)
- Charanjit Kaur
- Department of Pharmaceutical Chemistry, Khalsa College of Pharmacy, Amritsar, Punjab, 143002
| | - Sachin Sharma
- School of Pharmacy, Taipei Medical University, Taiwan
| | | | - Ram Sharma
- School of Pharmacy, Taipei Medical University, Taiwan
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2
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Sharma P, Gupta R, Bansal RK. Recent advances in organocatalytic asymmetric aza-Michael reactions of amines and amides. Beilstein J Org Chem 2021; 17:2585-2610. [PMID: 34760026 PMCID: PMC8551878 DOI: 10.3762/bjoc.17.173] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2021] [Accepted: 09/27/2021] [Indexed: 11/23/2022] Open
Abstract
Nitrogen-containing scaffolds are ubiquitous in nature and constitute an important class of building blocks in organic synthesis. The asymmetric aza-Michael reaction (aza-MR) alone or in tandem with other organic reaction(s) is an important synthetic tool to form new C-N bond(s) leading to developing new libraries of diverse types of bioactive nitrogen compounds. The synthesis and application of a variety of organocatalysts for accomplishing highly useful organic syntheses without causing environmental pollution in compliance with 'Green Chemistry" has been a landmark development in the recent past. Application of many of these organocatalysts has been extended to asymmetric aza-MR during the last two decades. The present article overviews the literature published during the last 10 years concerning the asymmetric aza-MR of amines and amides catalysed by organocatalysts. Both types of the organocatalysts, i.e., those acting through non-covalent interactions and those working through covalent bond formation have been applied for the asymmetric aza-MR. Thus, the review includes the examples wherein cinchona alkaloids, squaramides, chiral amines, phase-transfer catalysts and chiral bifunctional thioureas have been used, which activate the substrates through hydrogen bond formation. Most of these reactions are accompanied by high yields and enantiomeric excesses. On the other hand, N-heterocyclic carbenes and chiral pyrrolidine derivatives acting through covalent bond formation such as the iminium ions with the substrates have also been included. Wherever possible, a comparison has been made between the efficacies of various organocatalysts in asymmetric aza-MR.
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Affiliation(s)
- Pratibha Sharma
- Department of Chemistry, The IIS (deemed to be University), Jaipur 302 020, India
| | - Raakhi Gupta
- Department of Chemistry, The IIS (deemed to be University), Jaipur 302 020, India
| | - Raj Kumar Bansal
- Department of Chemistry, The IIS (deemed to be University), Jaipur 302 020, India
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Sánchez-Roselló M, Escolano M, Gaviña D, Del Pozo C. Two Decades of Progress in the Asymmetric Intramolecular aza-Michael Reaction. CHEM REC 2021; 22:e202100161. [PMID: 34415097 DOI: 10.1002/tcr.202100161] [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: 06/04/2021] [Revised: 07/22/2021] [Accepted: 08/04/2021] [Indexed: 11/08/2022]
Abstract
The asymmetric intramolecular aza-Michael reaction (IMAMR) is a very convenient strategy for the generation of heterocycles bearing nitrogen-substituted stereocenters. Due to the ubiquitous presence of these skeletons in natural products, the IMAMR has found widespread applications in the total synthesis of alkaloids and biologically relevant compounds. The development of asymmetric versions of the IMAMR are quite recent, most of them reported in this century. The fundamental advances in this field involve the use of organocatalysts. Chiral imidazolidinones, diaryl prolinol derivatives, Cinchone-derived primary amines and quaternary ammonium salts, and BINOL-derived phosphoric acids account for the success of those methodologies. Moreover, the use of N-sulfinyl imines with a dual role, as nitrogen nucleophiles and as chiral auxiliaries, appeared as a versatile mode of performing the asymmetric IMAMR.
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Affiliation(s)
- María Sánchez-Roselló
- Organic Chemistry, University of Valencia, Avda Vicente Andrés Estellés s/n, 46100-Burjassot, Valencia), Spain
| | - Marcos Escolano
- Organic Chemistry, University of Valencia, Avda Vicente Andrés Estellés s/n, 46100-Burjassot, Valencia), Spain
| | - Daniel Gaviña
- Organic Chemistry, University of Valencia, Avda Vicente Andrés Estellés s/n, 46100-Burjassot, Valencia), Spain
| | - Carlos Del Pozo
- Organic Chemistry, University of Valencia, Avda Vicente Andrés Estellés s/n, 46100-Burjassot, Valencia), Spain
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Escolano M, Torres Fernández J, Rabasa-Alcañiz F, Sánchez-Roselló M, Pozo CD. Enantioselective Synthesis of Pyrrolizidinone Scaffolds through Multiple-Relay Catalysis. Org Lett 2020; 22:9433-9438. [PMID: 33253590 DOI: 10.1021/acs.orglett.0c03344] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A triple-tandem protocol for the synthesis of the pyrrolizidinone skeleton has been devised. It involves a cross metathesis-intramolecular aza-Michael reaction-intramolecular Michael addition tandem sequence, starting from N-pentenyl-4-oxo-2-alkenamides and conjugated ketones. In the presence of two cooperative catalysts, namely the second-generation Hoveyda-Grubbs catalyst and (R)-TRIP-derived BINOL phosphoric acid, this multiple-relay catalytic process takes place in good yields and outstanding levels of diastero- and enantioselectivity with the simultaneous generation of three contiguous stereocenters.
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Affiliation(s)
- Marcos Escolano
- Department of Organic Chemistry, University of Valencia, Avda Vicente Andrés Estellés s/n, 46100 Burjassot-Valencia, Spain
| | - Javier Torres Fernández
- Department of Organic Chemistry, University of Valencia, Avda Vicente Andrés Estellés s/n, 46100 Burjassot-Valencia, Spain
| | - Fernando Rabasa-Alcañiz
- Department of Organic Chemistry, University of Valencia, Avda Vicente Andrés Estellés s/n, 46100 Burjassot-Valencia, Spain
| | - María Sánchez-Roselló
- Department of Organic Chemistry, University of Valencia, Avda Vicente Andrés Estellés s/n, 46100 Burjassot-Valencia, Spain
| | - Carlos Del Pozo
- Department of Organic Chemistry, University of Valencia, Avda Vicente Andrés Estellés s/n, 46100 Burjassot-Valencia, Spain
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5
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Shen C, Wang A, Xu J, An Z, Loh KY, Zhang P, Liu X. Recent Advances in the Catalytic Synthesis of 4-Quinolones. Chem 2019. [DOI: 10.1016/j.chempr.2019.01.006] [Citation(s) in RCA: 34] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
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Vinogradov MG, Turova OV, Zlotin SG. Recent advances in the asymmetric synthesis of pharmacology-relevant nitrogen heterocycles via stereoselective aza-Michael reactions. Org Biomol Chem 2019; 17:3670-3708. [DOI: 10.1039/c8ob03034k] [Citation(s) in RCA: 85] [Impact Index Per Article: 17.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
In this review, recent applications of a stereoselective aza-Michael reaction for asymmetric synthesis of naturally occurring N-containing heterocyclic scaffolds and their usefulness to pharmacology are summarized.
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Affiliation(s)
- Maxim G. Vinogradov
- N.D. Zelinsky Institute of Organic Chemistry
- Russian Academy of Sciences
- 119991 Moscow
- Russian Federation
| | - Olga V. Turova
- N.D. Zelinsky Institute of Organic Chemistry
- Russian Academy of Sciences
- 119991 Moscow
- Russian Federation
| | - Sergei G. Zlotin
- N.D. Zelinsky Institute of Organic Chemistry
- Russian Academy of Sciences
- 119991 Moscow
- Russian Federation
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Roy TK, Parhi B, Ghorai P. Cinchonamine Squaramide Catalyzed Asymmetric aza-Michael Reaction: Dihydroisoquinolines and Tetrahydropyridines. Angew Chem Int Ed Engl 2018; 57:9397-9401. [DOI: 10.1002/anie.201805020] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2018] [Indexed: 12/26/2022]
Affiliation(s)
- Tarun Kumar Roy
- Department of Chemistry; Indian Institute of Science Education and Research (IISER) Bhopal; Bhopal By-pass Road Bhauri Bhopal- 462066 India
| | - Biswajit Parhi
- Department of Chemistry; Indian Institute of Science Education and Research (IISER) Bhopal; Bhopal By-pass Road Bhauri Bhopal- 462066 India
| | - Prasanta Ghorai
- Department of Chemistry; Indian Institute of Science Education and Research (IISER) Bhopal; Bhopal By-pass Road Bhauri Bhopal- 462066 India
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8
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Roy TK, Parhi B, Ghorai P. Cinchonamine Squaramide Catalyzed Asymmetric aza-Michael Reaction: Dihydroisoquinolines and Tetrahydropyridines. Angew Chem Int Ed Engl 2018. [DOI: 10.1002/ange.201805020] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Affiliation(s)
- Tarun Kumar Roy
- Department of Chemistry; Indian Institute of Science Education and Research (IISER) Bhopal; Bhopal By-pass Road Bhauri Bhopal- 462066 India
| | - Biswajit Parhi
- Department of Chemistry; Indian Institute of Science Education and Research (IISER) Bhopal; Bhopal By-pass Road Bhauri Bhopal- 462066 India
| | - Prasanta Ghorai
- Department of Chemistry; Indian Institute of Science Education and Research (IISER) Bhopal; Bhopal By-pass Road Bhauri Bhopal- 462066 India
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9
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Koverzanova EV, Levina II, Gridnev AA. Kinetics of the aza-Michael Reaction at Room Temperature. RUSSIAN JOURNAL OF PHYSICAL CHEMISTRY B 2018. [DOI: 10.1134/s1990793118010219] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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10
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Govender T, Arvidsson PI, Maguire GEM, Kruger HG, Naicker T. Enantioselective Organocatalyzed Transformations of β-Ketoesters. Chem Rev 2016; 116:9375-437. [PMID: 27463615 DOI: 10.1021/acs.chemrev.6b00156] [Citation(s) in RCA: 94] [Impact Index Per Article: 11.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The β-ketoester structural motif continues to intrigue chemists with its electrophilic and nucleophilic sites. Proven to be a valuable tool within organic synthesis, natural product, and medicinal chemistry, reports on chiral β-ketoester molecular skeletons display a steady increase. With the reignition of organocatalysis in the past decade, asymmetric methods available for the synthesis of this structural unit has significantly expanded, making it one of the most exploited substrates for organocatalytic transformations. This review provides comprehensive information on the plethora of organocatalysts used in stereoselective organocatalyzed construction of β-ketoester-containing compounds.
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Affiliation(s)
- Thavendran Govender
- Catalysis and Peptide Research Unit, University of KwaZulu Natal , Durban, 4001, South Africa
| | - Per I Arvidsson
- Catalysis and Peptide Research Unit, University of KwaZulu Natal , Durban, 4001, South Africa.,P. I. Arvidsson, Science for Life Laboratory, Drug Discovery and Development Platform and Division of Translational Medicine and Chemical Biology, Department of Medical Biochemistry and Biophysics, Karolinska Institutet SE-171 77 Stockholm, Sweden
| | - Glenn E M Maguire
- Catalysis and Peptide Research Unit, University of KwaZulu Natal , Durban, 4001, South Africa
| | - Hendrik G Kruger
- Catalysis and Peptide Research Unit, University of KwaZulu Natal , Durban, 4001, South Africa
| | - Tricia Naicker
- Catalysis and Peptide Research Unit, University of KwaZulu Natal , Durban, 4001, South Africa
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11
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Pan GF, Su L, Zhang YL, Guo SH, Wang YQ. Organocatalytic one-pot asymmetric synthesis of 2-aryl-2,3-dihydro-4-quinolones. RSC Adv 2016. [DOI: 10.1039/c6ra01247g] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022] Open
Abstract
A highly efficient organocatalytic one-pot approach for enantioselective synthesis of (R)-2-aryl-2,3-dihydro-4-quinolones from o-aminoacetophenones and aryl aldehydes has been achieved.
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Affiliation(s)
- Gao-Fei Pan
- Key Laboratory of Synthetic and Natural Functional Molecule Chemistry of Ministry of Education
- Department of Chemistry & Materials Science
- Northwest University
- Xi'an 710069
- P.R. China
| | - Li Su
- Key Laboratory of Synthetic and Natural Functional Molecule Chemistry of Ministry of Education
- Department of Chemistry & Materials Science
- Northwest University
- Xi'an 710069
- P.R. China
| | - Yan-Lei Zhang
- Key Laboratory of Synthetic and Natural Functional Molecule Chemistry of Ministry of Education
- Department of Chemistry & Materials Science
- Northwest University
- Xi'an 710069
- P.R. China
| | - Shi-Huan Guo
- Key Laboratory of Synthetic and Natural Functional Molecule Chemistry of Ministry of Education
- Department of Chemistry & Materials Science
- Northwest University
- Xi'an 710069
- P.R. China
| | - Yong-Qiang Wang
- Key Laboratory of Synthetic and Natural Functional Molecule Chemistry of Ministry of Education
- Department of Chemistry & Materials Science
- Northwest University
- Xi'an 710069
- P.R. China
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Guo J, Yu S. Enantioselective synthesis of benzoindolizidine derivatives using chiral phase-transfer catalytic intramolecular domino aza-Michael addition/alkylation. Org Biomol Chem 2015; 13:1179-86. [DOI: 10.1039/c4ob02227k] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
An efficient and enantioselective strategy to synthesize benzoindolizidinesviadomino intramolecular aza-Michael addition/alkylation was developed.
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Affiliation(s)
- Jiajia Guo
- State Key Laboratory of Analytical Chemistry for Life Science
- School of Chemistry and Chemical Engineering
- Nanjing University
- Nanjing 210093
- China
| | - Shouyun Yu
- State Key Laboratory of Analytical Chemistry for Life Science
- School of Chemistry and Chemical Engineering
- Nanjing University
- Nanjing 210093
- China
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13
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Kong L, Han X, Jiao P. Catalytic asymmetric Diels-Alder reactions involving aryl vinyl ketones. Chem Commun (Camb) 2014; 50:14113-6. [PMID: 25271484 DOI: 10.1039/c4cc06837h] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A catalytic asymmetric Diels-Alder reaction of an aryl vinyl ketone with 1,3-dienylcarbamate has been developed. Cyclohexenes bearing vicinal amino and aroyl groups in a cis-configuration were prepared in excellent ee (>99%) and endo (single diastereomer) selectivity. The absolute configuration of one DA product was unambiguously confirmed using XRD analysis. The transition state structure was proposed on the basis of DFT calculations.
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Affiliation(s)
- Liman Kong
- Key Laboratory of Radiopharmaceuticals, Ministry of Education, College of Chemistry, Beijing Normal University, Haidian, Beijing 100875, P. R. China.
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14
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Mondal B, Pan SC. Primary amino acid catalyzed asymmetric intramolecular Mannich reaction for the synthesis of 2-aryl-2,3-dihydro-4-quinolones. Org Biomol Chem 2014; 12:9789-92. [DOI: 10.1039/c4ob02146k] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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15
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Sun Z, Winschel GA, Zimmerman PM, Nagorny P. Enantioselective Synthesis of Piperidines through the Formation of Chiral Mixed Phosphoric Acid Acetals: Experimental and Theoretical Studies. Angew Chem Int Ed Engl 2014; 53:11194-8. [DOI: 10.1002/anie.201405128] [Citation(s) in RCA: 53] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2014] [Indexed: 01/17/2023]
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16
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Sun Z, Winschel GA, Zimmerman PM, Nagorny P. Enantioselective Synthesis of Piperidines through the Formation of Chiral Mixed Phosphoric Acid Acetals: Experimental and Theoretical Studies. Angew Chem Int Ed Engl 2014. [DOI: 10.1002/ange.201405128] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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17
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Cheng S, Zhao L, Yu S. Enantioselective Synthesis of Azaflavanones Using Organocatalytic 6-endoAza-Michael Addition. Adv Synth Catal 2014. [DOI: 10.1002/adsc.201300920] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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18
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Sánchez-Roselló M, Aceña JL, Simón-Fuentes A, del Pozo C. A general overview of the organocatalytic intramolecular aza-Michael reaction. Chem Soc Rev 2014; 43:7430-53. [DOI: 10.1039/c4cs00156g] [Citation(s) in RCA: 140] [Impact Index Per Article: 14.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
The organocatalytic intramolecular aza-Michael reaction: a useful strategy to generate enantiomerically enriched nitrogen-containing heterocycles.
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Affiliation(s)
- María Sánchez-Roselló
- Departamento de Química Orgánica
- Universidad de Valencia
- E-46100-Burjassot, Spain
- Laboratorio de Moléculas Orgánicas
- Centro de Investigación Principe Felipe
| | - José Luis Aceña
- Departamento de Química Orgánica I
- Universidad del País Vasco UPV/EHU
- San Sebastián, Spain
| | | | - Carlos del Pozo
- Departamento de Química Orgánica
- Universidad de Valencia
- E-46100-Burjassot, Spain
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Ghosh AK, Zhou B. Bifunctional cinchona alkaloid-squaramide-catalyzed highly enantioselective aza-Michael addition of indolines to α,β-unsaturated ketones. Tetrahedron Lett 2013; 54:3500-3502. [PMID: 24014895 PMCID: PMC3763959 DOI: 10.1016/j.tetlet.2013.04.080] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Abstract
An enantioselective aza-Michael addition of indolines to α,β-unsaturated ketones was achieved using a bifunctional cinchona alkaloid-derived chiral squaramide derivative. Various β-indolinyl ketone derivatives were obtained in good to excellent yields and with high enantioselectivity. DDQ or MnO2 oxidation of indoline derivatives provided convenient access to various enantioenriched N-substituted indole derivatives.
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Affiliation(s)
- Arun K. Ghosh
- Department of Chemistry and Medicinal Chemistry, Purdue University, 560 Oval Drive, West Lafayette, IN 47907, United States
| | - Bing Zhou
- Department of Chemistry and Medicinal Chemistry, Purdue University, 560 Oval Drive, West Lafayette, IN 47907, United States
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Kanagaraj K, Pitchumani K. Per-6-amino-β-cyclodextrin as a chiral base catalyst promoting one-pot asymmetric synthesis of 2-aryl-2,3-dihydro-4-quinolones. J Org Chem 2012; 78:744-51. [PMID: 23245355 DOI: 10.1021/jo302173a] [Citation(s) in RCA: 65] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A highly efficient one-pot synthesis of enantiomerically enriched 2-aryl-2,3-dihydroquinolin-4(1H)-ones has been carried out for the first time using per-6-ABCD as a supramolecular host, chiral base catalyst, and a reusable promoter to give the corresponding scaffold with high yield (up to 99%) and enantiomeric excess (up to 99%). The catalyst is recovered and reused without loss in its activity.
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Xiao X, Liu X, Dong S, Cai Y, Lin L, Feng X. Asymmetric Synthesis of 2,3-Dihydroquinolin-4-one Derivatives Catalyzed by a Chiral Bisguanidium Salt. Chemistry 2012; 18:15922-6. [DOI: 10.1002/chem.201203216] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2012] [Indexed: 11/08/2022]
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22
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Liang Z, Ju L, Xie Y, Huang L, Zhang Y. Free-Amine-Directed Alkenylation of C(sp2)H and Cycloamination by Palladium Catalysis. Chemistry 2012; 18:15816-21. [DOI: 10.1002/chem.201202672] [Citation(s) in RCA: 91] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2012] [Revised: 10/10/2012] [Indexed: 11/08/2022]
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23
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Zeng M, Zhang W, You S. One-Pot Synthesis of Pyrrolo[1,2-a]indoles by ChiralN-Triflyl Phosphoramide Catalyzed Friedel-Crafts Alkylation of 4,7-Dihydroindole withβ,γ-Unsaturatedα-Keto Esters. CHINESE J CHEM 2012. [DOI: 10.1002/cjoc.201200759] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
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24
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Raja S, Ieawsuwan W, Korotkov V, Rueping M. Asymmetric Brønsted Acid-Catalyzed Nazarov Cyclization of Acyclic α-Alkoxy Dienones. Chem Asian J 2012; 7:2361-6. [DOI: 10.1002/asia.201200391] [Citation(s) in RCA: 50] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/01/2012] [Indexed: 11/07/2022]
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25
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Wang J, Li P, Choy PY, Chan ASC, Kwong FY. Advances and Applications in Organocatalytic Asymmetric aza-Michael Addition. ChemCatChem 2012. [DOI: 10.1002/cctc.201200135] [Citation(s) in RCA: 138] [Impact Index Per Article: 11.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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26
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Wang SG, Han L, Zeng M, Sun FL, Zhang W, You SL. Enantioselective synthesis of fluorene derivatives by chiral N-triflyl phosphoramide catalyzed double Friedel–Crafts alkylation reaction. Org Biomol Chem 2012; 10:3202-9. [DOI: 10.1039/c2ob07168a] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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27
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Rueping M, Nachtsheim BJ, Ieawsuwan W, Atodiresei I. Modulation der Acidität - hoch acide Brønsted-Säuren in der asymmetrischen Katalyse. Angew Chem Int Ed Engl 2011. [DOI: 10.1002/ange.201100169] [Citation(s) in RCA: 106] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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28
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Rueping M, Nachtsheim BJ, Ieawsuwan W, Atodiresei I. Modulating the Acidity: Highly Acidic Brønsted Acids in Asymmetric Catalysis. Angew Chem Int Ed Engl 2011; 50:6706-20. [DOI: 10.1002/anie.201100169] [Citation(s) in RCA: 226] [Impact Index Per Article: 17.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2011] [Indexed: 11/09/2022]
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Rueping M, Kuenkel A, Atodiresei I. Chiral Brønsted acids in enantioselective carbonyl activations – activation modes and applications. Chem Soc Rev 2011; 40:4539-49. [DOI: 10.1039/c1cs15087a] [Citation(s) in RCA: 479] [Impact Index Per Article: 36.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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30
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Gu Q, You SL. Desymmetrization of cyclohexadienones via cinchonine derived thiourea-catalyzed enantioselective aza-Michael reaction and total synthesis of (-)-Mesembrine. Chem Sci 2011. [DOI: 10.1039/c1sc00083g] [Citation(s) in RCA: 149] [Impact Index Per Article: 11.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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Rueping M, Ieawsuwan W. Asymmetric Brønsted acid catalyzed carbonyl activation – organocatalytic domino electrocyclization–halogenation reaction. Chem Commun (Camb) 2011; 47:11450-2. [DOI: 10.1039/c1cc15289k] [Citation(s) in RCA: 67] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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