1
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Mo NF, Zhang Y, Guan ZH. Highly Enantioselective Three-Component Povarov Reaction for Direct Construction of Azaspirocycles. Org Lett 2022; 24:6397-6401. [PMID: 36018318 DOI: 10.1021/acs.orglett.2c02421] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
An asymmetric organocatalyzed three-component Povarov reaction to construct azaspirocycles has been developed. A chiral phosphoric acid OCF-CPA bearing o-CF3-aryl on the H8-BINOL-framework is highly efficient in the reaction. The reaction was carried out under mind conditions for synthesis of a range of azaspirocycles in high yields and high to excellent enantioselectivities, thus expending the substrate scope of the traditional Povarov reaction.
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Affiliation(s)
- Nan-Fang Mo
- Key Laboratory of Synthetic and Nature Functional Molecule of the Ministry of Education, Department of Chemistry & Materials Science, Northwest University, Xi'an 710127, P.R. China
| | - Ying Zhang
- Key Laboratory of Synthetic and Nature Functional Molecule of the Ministry of Education, Department of Chemistry & Materials Science, Northwest University, Xi'an 710127, P.R. China
| | - Zheng-Hui Guan
- Key Laboratory of Synthetic and Nature Functional Molecule of the Ministry of Education, Department of Chemistry & Materials Science, Northwest University, Xi'an 710127, P.R. China
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2
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de Fátima Â, Fernandes SA, Ferreira de Paiva W, de Freitas Rego Y. The Povarov Reaction: A Versatile Method to Synthesize Tetrahydroquinolines, Quinolines and Julolidines. SYNTHESIS-STUTTGART 2022. [DOI: 10.1055/a-1794-8355] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
AbstractThe multicomponent Povarov reaction represents a powerful approach for the construction of substances containing N-heterocyclic frameworks. By using the Povarov reaction, in addition to accessing tetrahydroquinolines, quinolines and julolidines in a single step, it is possible to form the following new bonds: two Csp
3–Csp
3 and one Csp
3–Nsp
3, two Csp
2–Csp
2 and one Csp
2–Nsp
2, and four Csp
3–Csp
3 and two Csp
3–Nsp
1, respectively. This short review discusses the main features of the Povarov reaction, including its mechanism, the reaction scope by employing different catalysts and substrates, as well as stereoselective versions.1 Introduction2 Mechanism of the Povarov Reaction3 Tetrahydroquinolines4 Quinolines5 Julolidines6 Concluding Remarks
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Affiliation(s)
- Ângelo de Fátima
- Departamento de Química, ICEx, Universidade Federal de Minas Gerais
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3
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Haarr MB, Sydnes MO. Synthesis of the Hexahydropyrrolo-[3,2-c]-quinoline Core Structure and Strategies for Further Elaboration to Martinelline, Martinellic Acid, Incargranine B, and Seneciobipyrrolidine. Molecules 2021; 26:molecules26020341. [PMID: 33440776 PMCID: PMC7827258 DOI: 10.3390/molecules26020341] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2020] [Revised: 01/05/2021] [Accepted: 01/07/2021] [Indexed: 02/03/2023] Open
Abstract
Natural products are rich sources of interesting scaffolds possessing a plethora of biological activity. With the isolation of the martinella alkaloids in 1995, namely martinelline and martinellic acid, the pyrrolo[3,2-c]quinoline scaffold was discovered. Since then, this scaffold has been found in two additional natural products, viz. incargranine B and seneciobipyrrolidine. These natural products have attracted attention from synthetic chemists both due to the interesting scaffold they contain, but also due to the biological activity they possess. This review highlights the synthetic efforts made for the preparation of these alkaloids and formation of analogues with interesting biological activity.
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4
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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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5
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Kazancioglu MZ, Kalay E, Kazancioglu EA, Peshkov VA. Enantioselective Assembly of Tricyclic Tetrahydroquinoline Derivatives. ChemistrySelect 2019. [DOI: 10.1002/slct.201902249] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Affiliation(s)
- Mustafa Z. Kazancioglu
- Yusuf Serefoglu Faculty of Health SciencesKilis 7 Aralik University 79090 Kilis Turkey
- Advanced Technology Application and Research CenterKilis 7 Aralik University 79090 Kilis Turkey
| | - Erbay Kalay
- Kars Vocational SchoolKafkas University 36100 Kars Turkey
| | - Elif Akin Kazancioglu
- Advanced Technology Application and Research CenterKilis 7 Aralik University 79090 Kilis Turkey
- Vocational High School of Health ServicesKilis 7 Aralik University 79090 Kilis Turkey
| | - Vsevolod A. Peshkov
- Department of ChemistrySchool of Science and TechnologyNazarbayev University 53 Kabanbay Batyr Ave, Block 7 Nur-Sultan 010000 Republic of Kazakhstan
- The Environment and Resource Efficiency Cluster (EREC)Nazarbayev University Nur-Sultan Republic of Kazakhstan
- College of ChemistryChemical Engineering and Materials ScienceSoochow University, Dushu Lake Campus Suzhou 215123 P. R. China
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6
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Abstract
A continuous flow platform has been developed that integrates reactive distillation with modern flow reactor technology.
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Affiliation(s)
- Marcus Baumann
- School of Chemistry
- University College Dublin
- Science Centre South
- Dublin 4
- Ireland
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7
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Ghashghaei O, Masdeu C, Alonso C, Palacios F, Lavilla R. Recent advances of the Povarov reaction in medicinal chemistry. DRUG DISCOVERY TODAY. TECHNOLOGIES 2018; 29:71-79. [PMID: 30471676 DOI: 10.1016/j.ddtec.2018.08.004] [Citation(s) in RCA: 51] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/27/2018] [Revised: 07/23/2018] [Accepted: 08/07/2018] [Indexed: 12/14/2022]
Abstract
The Povarov multicomponent reaction consists on the condensation of an aniline, an aldehyde, and an activated olefin to generate a tetrahydroquinoline adduct with 3 diversity points. Hereby, we report the main features of this transformation and its uses in medicinal chemistry. Relevant examples of the impact of Povarov adducts in different therapeutic areas are provided.
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Affiliation(s)
- Ouldouz Ghashghaei
- Laboratory of Medicinal Chemistry, Faculty of Pharmacy and Food Sciences and Institute of Biomedicine (IBUB), University of Barcelona, Av. de Joan XXIII, 27-31, 08028 Barcelona, Spain
| | - Carme Masdeu
- Departamento de Química Orgánica I, Facultad de Farmacia, University of the Basque Country, UPV/EHU Paseo de la Universidad 7, 01006 Vitoria-Gasteiz, Spain
| | - Concepción Alonso
- Departamento de Química Orgánica I, Facultad de Farmacia, University of the Basque Country, UPV/EHU Paseo de la Universidad 7, 01006 Vitoria-Gasteiz, Spain
| | - Francisco Palacios
- Departamento de Química Orgánica I, Facultad de Farmacia, University of the Basque Country, UPV/EHU Paseo de la Universidad 7, 01006 Vitoria-Gasteiz, Spain.
| | - Rodolfo Lavilla
- Laboratory of Medicinal Chemistry, Faculty of Pharmacy and Food Sciences and Institute of Biomedicine (IBUB), University of Barcelona, Av. de Joan XXIII, 27-31, 08028 Barcelona, Spain.
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8
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Tejería A, Pérez-Pertejo Y, Reguera RM, Balaña-Fouce R, Alonso C, González M, Rubiales G, Palacios F. Substituted 1,5-naphthyridine derivatives as novel antileishmanial agents. Synthesis and biological evaluation. Eur J Med Chem 2018; 152:137-147. [PMID: 29704722 DOI: 10.1016/j.ejmech.2018.04.033] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2018] [Revised: 04/11/2018] [Accepted: 04/16/2018] [Indexed: 10/17/2022]
Abstract
Visceral leishmaniasis is a parasitic disease that affects, among other areas, both sides of the Mediterranean Basin. The drugs classically used in clinical practice are pentavalent antimonials (SbV) and amphotericin B, which are nephrotoxic, require parenteral administration, and increasing drug resistance in visceral leishmaniasis has been observed. These circumstances justify the search of new families of compounds to find effective drugs against the disease. Eukaryotic type I DNA topoisomerase (TopIB) has been found essential for the viability of the parasites, and therefore represents a promising target in the development of an antileishmanial therapy. In this search, heterocyclic compounds, such as 1,5-naphthyridines, have been prepared by cycloaddition reaction between N-(3-pyridyl)aldimines and acetylenes and their antileishmanial activity on promastigotes and amastigote-infected splenocytes of Leishmania infantum has been evaluated. In addition, the cytotoxic effects of newly synthesized compounds were assessed on host murine splenocytes in order to calculate the corresponding selective indexes (SI). Excellent antileishmanial activity of 1,5-naphthyridine 19, 21, 22, 24 and 27 has been observed with similar activity than the standard drug amphotericin B and higher selective index (SI > 100) towards L. infantum amastigotes than amphotericin B (SI > 62.5). Special interest shows the 1,5-naphthyridine 22 with an IC50 value (0.58 ± 0.03 μM) similar to the standard drug amphotericin B (0.32 ± 0.05 μM) and with the highest selective index (SI = 271.5). In addition, this compound shows remarkable inhibition on leishmanial TopIB. However, despite these interesting results, further studies are needed to disclose other potential targets involved in the antileishmanial effect of these novel compounds.
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Affiliation(s)
- Ana Tejería
- Departamento de Ciencias Biomédicas, Universidad de León, Campus de Vegazana s/n, 24071, León, Spain
| | - Yolanda Pérez-Pertejo
- Departamento de Ciencias Biomédicas, Universidad de León, Campus de Vegazana s/n, 24071, León, Spain
| | - Rosa M Reguera
- Departamento de Ciencias Biomédicas, Universidad de León, Campus de Vegazana s/n, 24071, León, Spain
| | - Rafael Balaña-Fouce
- Departamento de Ciencias Biomédicas, Universidad de León, Campus de Vegazana s/n, 24071, León, Spain
| | - Concepción Alonso
- Departamento de Química Orgánica I, Facultad de Farmacia and Centro de Investigación Lascaray (Lascaray Research Center), Universidad del País Vasco/Euskal Herriko Unibertsitatea (UPV/EHU), Paseo de la Universidad 7, 01006, Vitoria-Gasteiz, Spain
| | - María González
- Departamento de Química Orgánica I, Facultad de Farmacia and Centro de Investigación Lascaray (Lascaray Research Center), Universidad del País Vasco/Euskal Herriko Unibertsitatea (UPV/EHU), Paseo de la Universidad 7, 01006, Vitoria-Gasteiz, Spain
| | - Gloria Rubiales
- Departamento de Química Orgánica I, Facultad de Farmacia and Centro de Investigación Lascaray (Lascaray Research Center), Universidad del País Vasco/Euskal Herriko Unibertsitatea (UPV/EHU), Paseo de la Universidad 7, 01006, Vitoria-Gasteiz, Spain
| | - Francisco Palacios
- Departamento de Química Orgánica I, Facultad de Farmacia and Centro de Investigación Lascaray (Lascaray Research Center), Universidad del País Vasco/Euskal Herriko Unibertsitatea (UPV/EHU), Paseo de la Universidad 7, 01006, Vitoria-Gasteiz, Spain.
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9
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Takasu K, Shindo N. Synthesis of Azaheterocycles and Related Molecules by Tf2NH-Catalyzed Cycloadditions. HETEROCYCLES 2018. [DOI: 10.3987/rev-17-875] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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10
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Alonso C, González M, Palacios F, Rubiales G. Study of the Hetero-[4+2]-Cycloaddition Reaction of Aldimines and Alkynes. Synthesis of 1,5-Naphthyridine and Isoindolone Derivatives. J Org Chem 2017; 82:6379-6387. [PMID: 28537387 DOI: 10.1021/acs.joc.7b00977] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
Both experimental and computational studies for the cycloaddition reaction between N-(3-pyridyl)aldimines and acetylenes where 1,5-naphthyridines are obtained are reported. The reaction of benzaldimine with a methoxycarbonyl group in position 2 with phenyl acetylene, styrene, and indene afforded polycyclic isoindolone derivatives. The mechanism of reaction of N-(3-pyridyl)aldimines with olefins can be explained by an asynchronous [4+2] cycloaddition; in the case of acetylenes, the obtained results suggest a stepwise mechanism through a 3-azatriene.
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Affiliation(s)
- Concepción Alonso
- Departamento de Química Orgánica I, Facultad de Farmacia, Centro de Investigaciones y Estudios Avanzados "Lucio Lascaray", Universidad del País Vasco UPV/EHU , Paseo de la Universidad 7, 01006 Vitoria, Spain
| | - María González
- Departamento de Química Orgánica I, Facultad de Farmacia, Centro de Investigaciones y Estudios Avanzados "Lucio Lascaray", Universidad del País Vasco UPV/EHU , Paseo de la Universidad 7, 01006 Vitoria, Spain
| | - Francisco Palacios
- Departamento de Química Orgánica I, Facultad de Farmacia, Centro de Investigaciones y Estudios Avanzados "Lucio Lascaray", Universidad del País Vasco UPV/EHU , Paseo de la Universidad 7, 01006 Vitoria, Spain
| | - Gloria Rubiales
- Departamento de Química Orgánica I, Facultad de Farmacia, Centro de Investigaciones y Estudios Avanzados "Lucio Lascaray", Universidad del País Vasco UPV/EHU , Paseo de la Universidad 7, 01006 Vitoria, Spain
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11
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Tejería A, Pérez-Pertejo Y, Reguera RM, Balaña-Fouce R, Alonso C, Fuertes M, González M, Rubiales G, Palacios F. Antileishmanial effect of new indeno-1,5-naphthyridines, selective inhibitors of Leishmania infantum type IB DNA topoisomerase. Eur J Med Chem 2016; 124:740-749. [DOI: 10.1016/j.ejmech.2016.09.017] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2016] [Revised: 09/01/2016] [Accepted: 09/06/2016] [Indexed: 12/11/2022]
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12
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A diastereoselective synthesis of tetrahydro- and dihydro-pyrido[2,3- c ]coumarin derivatives via a one-pot three-component Povarov reaction catalyzed by bismuth(III) chloride. Bioorg Med Chem Lett 2016; 26:5119-5125. [DOI: 10.1016/j.bmcl.2016.08.017] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2016] [Revised: 07/22/2016] [Accepted: 08/06/2016] [Indexed: 11/19/2022]
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13
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Alonso C, Fuertes M, González M, Rubiales G, Tesauro C, Knudsen BR, Palacios F. Synthesis and biological evaluation of indeno[1,5]naphthyridines as topoisomerase I (TopI) inhibitors with antiproliferative activity. Eur J Med Chem 2016; 115:179-90. [DOI: 10.1016/j.ejmech.2016.03.031] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2016] [Revised: 03/11/2016] [Accepted: 03/12/2016] [Indexed: 02/07/2023]
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14
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Lindbäck E, Sydnes MO. Catalytic Enantioselective Synthesis of the Partially Reduced Tricyclic Pyrrolo[3,2- c]quinoline Core Structure of the MartinellaAlkaloids. ChemistrySelect 2016. [DOI: 10.1002/slct.201600511] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Emil Lindbäck
- Faculty of Science and Technology; Department of Mathematics and Natural Science; University of Stavanger; NO-4036 Stavanger Norway
| | - Magne O. Sydnes
- Faculty of Science and Technology; Department of Mathematics and Natural Science; University of Stavanger; NO-4036 Stavanger Norway
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15
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Ferreira J, Duarte VCM, Noro J, Gil Fortes A, Alves MJ. Total facial selectivity of a d-erythrosyl aromatic imine in [4π + 2π] cycloadditions; synthesis of 2-alkylpolyol 1,2,3,4-tetrahydroquinolines. Org Biomol Chem 2016; 14:2930-7. [DOI: 10.1039/c5ob02594j] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Different electron-rich dienophiles were combined with the imine obtained from 2,4-O-benzylidene-d-erythrose and p-anisidine furnishing enantiomerically pure tetrahydroquinolines, by inverse electron-demand [4π + 2π] cycloaddition.
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Affiliation(s)
- Juliana Ferreira
- Departamento de Química
- Universidade do Minho
- 4710-057 Braga
- Portugal
| | | | - Jennifer Noro
- Departamento de Química
- Universidade do Minho
- 4710-057 Braga
- Portugal
| | | | - Maria J. Alves
- Departamento de Química
- Universidade do Minho
- 4710-057 Braga
- Portugal
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16
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Ríos-Gutiérrez M, Layeb H, Domingo LR. A DFT study of the mechanism of Brønsted acid catalysed Povarov reactions. Tetrahedron 2015. [DOI: 10.1016/j.tet.2015.10.012] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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17
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Pappoppula M, Aponick A. Enantioselective Total Synthesis of (−)‐Martinellic Acid. Angew Chem Int Ed Engl 2015. [DOI: 10.1002/ange.201507849] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Mukesh Pappoppula
- Department of Chemistry, Center for Heterocyclic Compounds, University of Florida, Gainesville, FL 32611 (USA)
| | - Aaron Aponick
- Department of Chemistry, Center for Heterocyclic Compounds, University of Florida, Gainesville, FL 32611 (USA)
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18
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Pappoppula M, Aponick A. Enantioselective Total Synthesis of (-)-Martinellic Acid. Angew Chem Int Ed Engl 2015; 54:15827-30. [PMID: 26572506 DOI: 10.1002/anie.201507849] [Citation(s) in RCA: 39] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2015] [Revised: 09/26/2015] [Indexed: 11/07/2022]
Abstract
An enantioselective total synthesis of martinellic acid is described. The pyrroloquinoline alkaloid core is efficiently prepared from a quinoline, employing a method which relies on a newly developed Cu-catalyzed enantioselective alkynylation using the chiral imidazole-based biaryl P,N ligand StackPhos to establish the absolute stereochemistry. The remaining carbon atoms are then installed by means of a diastereoselective Pd-catalyzed decarboxylative allylation and the synthesis is completed after straightforward functional-group manipulation. This new synthetic method enables the most concise enantioselective synthesis of this important class of molecules to date.
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Affiliation(s)
- Mukesh Pappoppula
- Department of Chemistry, Center for Heterocyclic Compounds, University of Florida, Gainesville, FL 32611 (USA)
| | - Aaron Aponick
- Department of Chemistry, Center for Heterocyclic Compounds, University of Florida, Gainesville, FL 32611 (USA).
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19
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Li Y, Xu H, Xing M, Huang F, Jia J, Gao J. Iodine-Promoted Construction of Polysubstituted 2,3-Dihydropyrroles from Chalcones and β-Enamine Ketones (Esters). Org Lett 2015; 17:3690-3. [DOI: 10.1021/acs.orglett.5b01652] [Citation(s) in RCA: 68] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Affiliation(s)
- Yujin Li
- College
of Chemical Engineering, Zhejiang University of Technology, Hangzhou 310014, P. R. China
| | - Hui Xu
- College
of Chemical Engineering, Zhejiang University of Technology, Hangzhou 310014, P. R. China
| | - Mengming Xing
- College
of Chemical Engineering, Zhejiang University of Technology, Hangzhou 310014, P. R. China
| | - Fang Huang
- Department
of Pharmacology, School of Pharmaceutical Sciences, Southern Medical University, Guangzhou 510515, P. R. China
| | - Jianhong Jia
- College
of Chemical Engineering, Zhejiang University of Technology, Hangzhou 310014, P. R. China
| | - Jianrong Gao
- College
of Chemical Engineering, Zhejiang University of Technology, Hangzhou 310014, P. R. China
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20
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Boomhoff M, Yadav AK, Appun J, Schneider C. Modular, flexible, and stereoselective synthesis of pyrroloquinolines: rapid assembly of complex heterocyclic scaffolds. Org Lett 2014; 16:6236-9. [PMID: 25415061 DOI: 10.1021/ol503167h] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Abstract
A novel 1,2-dinucleophile engages two imines in a sequential vinylogous Mannich-Mannich-Pictet-Spengler process to generate complex hexahydropyrrolo[3,2-c]quinolines in a one-pot operation. This methodology provides a rapid, highly modular, and flexible access toward a wide range of products and forms four new σ-bonds and chiral centers each. The diastereoselectivity may be inverted by fine-tuning of reaction conditions and the electronic nature of the imines.
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Affiliation(s)
- Michael Boomhoff
- Department of Organic Chemistry, University of Leipzig, Johannisallee 29, D-04103 Leipzig, Germany
| | - Ashok K Yadav
- Department of Organic Chemistry, University of Leipzig, Johannisallee 29, D-04103 Leipzig, Germany
| | - Johannes Appun
- Department of Organic Chemistry, University of Leipzig, Johannisallee 29, D-04103 Leipzig, Germany
| | - Christoph Schneider
- Department of Organic Chemistry, University of Leipzig, Johannisallee 29, D-04103 Leipzig, Germany
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21
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22
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Yang YJ, Zhang HR, Zhu SY, Zhu P, Hui XP. Highly stereoselective synthesis of functionalized pyrrolo[3,2-c]quinolines via N-heterocyclic carbene catalyzed cascade sequence. Org Lett 2014; 16:5048-51. [PMID: 25247840 DOI: 10.1021/ol5023917] [Citation(s) in RCA: 40] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
An N-heterocyclic carbene-catalyzed stereoselective Michael-Mannich-lactamization cascade reaction of tosyl-protected o-amino aromatic aldimines and 2-bromoenals for the construction of functionalized pyrrolo[3,2-c]quinolines with three consecutive stereocenters was achieved in good yields with excellent diastereo- and enantioselectivities.
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Affiliation(s)
- Yu-Jie Yang
- State Key Laboratory of Applied Organic Chemistry, College of Chemistry and Chemical Engineering, Lanzhou University , Lanzhou 730000, P. R. China
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23
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Dagousset G, Erb W, Zhu J, Masson G. Phosphoric Acid Catalyzed Diastereo- and Enantioselective Synthesis of Substituted 1,3-Diaminotetralins. Org Lett 2014; 16:2554-7. [DOI: 10.1021/ol500946w] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Affiliation(s)
- Guillaume Dagousset
- Centre
de Recherche de Gif, Institut de Chimie des Substances Naturelles, CNRS, 91198 Gif-sur-Yvette Cedex, France
| | - William Erb
- Centre
de Recherche de Gif, Institut de Chimie des Substances Naturelles, CNRS, 91198 Gif-sur-Yvette Cedex, France
| | - Jieping Zhu
- Laboratory
of Synthesis and Natural Products, Institute of Chemical Sciences
and Engineering, Ecole Polytechnique Fédérale de Lausanne
(EPFL), EPFL-SB-ISIC-LSPN, CH-1015 Lausanne, Switzerland
| | - Géraldine Masson
- Centre
de Recherche de Gif, Institut de Chimie des Substances Naturelles, CNRS, 91198 Gif-sur-Yvette Cedex, France
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24
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Domingo LR, Aurell MJ, Sáez JA, Mekelleche SM. Understanding the mechanism of the Povarov reaction. A DFT study. RSC Adv 2014. [DOI: 10.1039/c4ra02916j] [Citation(s) in RCA: 45] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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25
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Patel B, Saviolaki G, Ayats C, Garcia MAE, Kapadia T, Hilton ST. Tuneable radical cyclisations: a tin-free approach towards tricyclic and spirocyclic heterocycles via a common precursor. RSC Adv 2014. [DOI: 10.1039/c4ra02420f] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022] Open
Abstract
A novel common precursor approach towards both tricyclic and spirocyclic heterocycles is described. Cyclisations are based on thiyl radical/isocyanide methodology and avoid the use of tin.
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Affiliation(s)
- B. Patel
- UCL School of Pharmacy
- London, UK
| | | | - C. Ayats
- UCL School of Pharmacy
- London, UK
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26
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Davies SG, Fletcher AM, Lee JA, Lorkin TJ, Roberts PM, Thomson JE. A diastereodivergent strategy for the asymmetric syntheses of (−)-martinellic acid and (−)-4-epi-martinellic acid. Tetrahedron 2013. [DOI: 10.1016/j.tet.2013.09.013] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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27
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Davies SG, Fletcher AM, Lee JA, Lorkin TJA, Roberts PM, Thomson JE. Asymmetric synthesis of (-)-martinellic acid. Org Lett 2013; 15:2050-3. [PMID: 23556476 DOI: 10.1021/ol4007508] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
A high-yielding total asymmetric synthesis of (-)-martinellic acid is reported. The conjugate addition of lithium (R)-N-allyl-N-(α-methyl-4-methoxybenzyl)amide to tert-butyl (E)-3-[2'-(N,N-diallylamino)-5'-bromophenyl]propenoate and alkylation of the resultant β-amino ester have been used as the key steps to install the C(9b) and C(3a) stereogenic centers, respectively, and a highly diastereoselective Wittig reaction/intramolecular Michael addition was then used to create the C(4) stereogenic center within this tricyclic molecular architecture.
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Affiliation(s)
- Stephen G Davies
- Department of Chemistry, Chemistry Research Laboratory, University of Oxford , Mansfield Road, Oxford OX1 3TA, UK.
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28
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Polindara-García LA, Miranda LD. Two-Step Synthesis of 2,3-Dihydropyrroles via a Formal 5-endo Cycloisomerization of Ugi 4-CR/Propargyl Adducts. Org Lett 2012; 14:5408-11. [DOI: 10.1021/ol3024727] [Citation(s) in RCA: 57] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Luis A. Polindara-García
- Instituto de Química, Universidad Nacional Autónoma de México, Circuito Exterior, Ciudad Universitaria, Coyoacán, México D.F. 04510, Mexico
| | - Luis D. Miranda
- Instituto de Química, Universidad Nacional Autónoma de México, Circuito Exterior, Ciudad Universitaria, Coyoacán, México D.F. 04510, Mexico
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29
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Krainova GF, Chudinova YO, Gorbunov AA, Mayorova OA, Glushkov VA. Benzo[b]Furan in the Povarov Reaction. MENDELEEV COMMUNICATIONS 2012. [DOI: 10.1016/j.mencom.2012.06.010] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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30
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Bieliauskas A, Martynaitis V, Getautis V, Malinauskas T, Jankauskas V, Kamarauskas E, Holzer W, Šačkus A. Synthesis of electroactive hydrazones derived from 3-(10-alkyl-10H-phenothiazin-3-yl)-2-propenals and their corresponding 3,3′-bispropenals. Tetrahedron 2012. [DOI: 10.1016/j.tet.2012.03.010] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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31
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Dagousset G, Retailleau P, Masson G, Zhu J. Chiral phosphoric acid-catalyzed enantioselective three-component Povarov reaction using cyclic enethioureas as dienophiles: stereocontrolled access to enantioenriched hexahydropyrroloquinolines. Chemistry 2012; 18:5869-73. [PMID: 22467440 DOI: 10.1002/chem.201200523] [Citation(s) in RCA: 79] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2012] [Indexed: 11/12/2022]
Abstract
Three become one: Phosphoric acid-catalyzed enantioselective three-component Povarov reactions of aldehydes, anilines, and endocyclic enethioureas have been developed (see scheme). This process afforded hexahydropyrroloquinolines in high yields with excellent diastereo- and enantioselectivities. The presence of the thiourea functionality is crucial for the enantioselectivity of the reaction.
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Affiliation(s)
- Guillaume Dagousset
- Centre de Recherche de Gif, Institut de Chimie des Substances Naturelles, CNRS, 91198 Gif-sur-Yvette Cedex, France
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32
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Hamada Y. Development of New Methods in Organic Synthesis and Their Applications to the Synthesis of Biologically Interesting Natural Products. Chem Pharm Bull (Tokyo) 2012; 60:1-20. [DOI: 10.1248/cpb.60.1] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Affiliation(s)
- Yasumasa Hamada
- Graduate School of Pharmaceutical Sciences, Chiba University
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33
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One-pot synthesis of pyrrolidino- and piperidinoquinolinones by three-component aza-Diels–Alder reactions of in situ generated N-arylimines and cyclic enamides. Tetrahedron Lett 2011. [DOI: 10.1016/j.tetlet.2011.09.021] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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34
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Dagousset G, Zhu J, Masson G. Chiral Phosphoric Acid-Catalyzed Enantioselective Three-Component Povarov Reaction Using Enecarbamates as Dienophiles: Highly Diastereo- and Enantioselective Synthesis of Substituted 4-Aminotetrahydroquinolines. J Am Chem Soc 2011; 133:14804-13. [DOI: 10.1021/ja205891m] [Citation(s) in RCA: 225] [Impact Index Per Article: 17.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Guillaume Dagousset
- Centre de Recherche de Gif, Institut de Chimie des Substances Naturelles, CNRS, 91198 Gif-sur-Yvette Cedex, France
| | - Jieping Zhu
- Institute of Chemical Sciences and Engineering, Ecole Polytechnique Fédérale de Lausanne, EPFL-SB-ISIC-LSPN, CH-1015 Lausanne, Switzerland
| | - Géraldine Masson
- Centre de Recherche de Gif, Institut de Chimie des Substances Naturelles, CNRS, 91198 Gif-sur-Yvette Cedex, France
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35
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Palacios F, Alonso C, Fuertes M, Ezpeleta JM, Rubiales G. Glyoxalate-Derived Aldimines in Cycloaddition Reactions with Olefins. European J Org Chem 2011. [DOI: 10.1002/ejoc.201100395] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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36
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Zhou F, Liu J, Ding K, Liu J, Cai Q. Copper-Catalyzed Tandem Reaction of Isocyanides with N-(2-Haloaryl)propiolamides for the Synthesis of Pyrrolo[3,2-c]quinolin-4-ones. J Org Chem 2011; 76:5346-53. [DOI: 10.1021/jo2006939] [Citation(s) in RCA: 49] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Fengtao Zhou
- Key Laboratory of Regenerative Biology and Institute of Chemical Biology, Guangzhou Institutes of Biomedicine and Health, Chinese Academy of Sciences, No. 190 Kaiyuan Avenue, Guangzhou Science Park, Guangzhou 510530, China
| | - Jianguang Liu
- Key Laboratory of Regenerative Biology and Institute of Chemical Biology, Guangzhou Institutes of Biomedicine and Health, Chinese Academy of Sciences, No. 190 Kaiyuan Avenue, Guangzhou Science Park, Guangzhou 510530, China
| | - Ke Ding
- Key Laboratory of Regenerative Biology and Institute of Chemical Biology, Guangzhou Institutes of Biomedicine and Health, Chinese Academy of Sciences, No. 190 Kaiyuan Avenue, Guangzhou Science Park, Guangzhou 510530, China
| | - Jinsong Liu
- Key Laboratory of Regenerative Biology and Institute of Chemical Biology, Guangzhou Institutes of Biomedicine and Health, Chinese Academy of Sciences, No. 190 Kaiyuan Avenue, Guangzhou Science Park, Guangzhou 510530, China
| | - Qian Cai
- Key Laboratory of Regenerative Biology and Institute of Chemical Biology, Guangzhou Institutes of Biomedicine and Health, Chinese Academy of Sciences, No. 190 Kaiyuan Avenue, Guangzhou Science Park, Guangzhou 510530, China
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37
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Kudale AA, Miller DO, Dawe LN, Bodwell GJ. Intramolecular Povarov reactions involving 3-aminocoumarins. Org Biomol Chem 2011; 9:7196-206. [DOI: 10.1039/c1ob05867c] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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38
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Palacios F, Alonso C, Arrieta A, Cossío FP, Ezpeleta JM, Fuertes M, Rubiales G. Lewis Acid Activated Aza-Diels-Alder Reaction ofN-(3-Pyridyl)aldimines: An Experimental and Computational Study. European J Org Chem 2010. [DOI: 10.1002/ejoc.200901325] [Citation(s) in RCA: 46] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
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39
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Vicente-García E, Catti F, Ramón R, Lavilla R. Unsaturated lactams: new inputs for povarov-type multicomponent reactions. Org Lett 2010; 12:860-3. [PMID: 20092279 DOI: 10.1021/ol902913j] [Citation(s) in RCA: 59] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Unsaturated lactams with endo- or exocyclic C-C double bonds constitute a set of reactive inputs that serve as the electron-rich olefin component in Povarov reactions. These substrates afford the multicomponent adducts in convenient yields and offer a wide range of structural diversity. Postcondensation transformations allow direct access to a variety of lactam-fused and amide-substituted quinoline derivatives.
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40
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Bhadury PS, Zhang Y, Zhang S, Song B, Yang S, Hu D, Chen Z, Xue W, Jin L. An effective route to fluorine containing asymmetric α-aminophosphonates using chiral Bronsted acid catalyst. Chirality 2009; 21:547-57. [DOI: 10.1002/chir.20645] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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41
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Davies SG, Mujtaba N, Roberts PM, Smith AD, Thomson JE. A Tandem Conjugate Addition/Cyclization Protocol for the Asymmetric Synthesis of 2-Aryl-4-aminotetrahydroquinoline-3-carboxylic Acid Derivatives. Org Lett 2009; 11:1959-62. [DOI: 10.1021/ol9004118] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Stephen G. Davies
- Department of Chemistry, Chemistry Research Laboratory, University of Oxford, Mansfield Road, Oxford OX1 3TA, U.K
| | - Nadeam Mujtaba
- Department of Chemistry, Chemistry Research Laboratory, University of Oxford, Mansfield Road, Oxford OX1 3TA, U.K
| | - Paul M. Roberts
- Department of Chemistry, Chemistry Research Laboratory, University of Oxford, Mansfield Road, Oxford OX1 3TA, U.K
| | - Andrew D. Smith
- Department of Chemistry, Chemistry Research Laboratory, University of Oxford, Mansfield Road, Oxford OX1 3TA, U.K
| | - James E. Thomson
- Department of Chemistry, Chemistry Research Laboratory, University of Oxford, Mansfield Road, Oxford OX1 3TA, U.K
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42
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Liu H, Dagousset G, Masson G, Retailleau P, Zhu J. Chiral Brønsted Acid-Catalyzed Enantioselective Three-Component Povarov Reaction. J Am Chem Soc 2009; 131:4598-9. [DOI: 10.1021/ja900806q] [Citation(s) in RCA: 344] [Impact Index Per Article: 22.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Hua Liu
- Institut de Chimie des Substances Naturelles, CNRS, 91198 Gif-sur-Yvette Cedex, France
| | - Guillaume Dagousset
- Institut de Chimie des Substances Naturelles, CNRS, 91198 Gif-sur-Yvette Cedex, France
| | - Géraldine Masson
- Institut de Chimie des Substances Naturelles, CNRS, 91198 Gif-sur-Yvette Cedex, France
| | - Pascal Retailleau
- Institut de Chimie des Substances Naturelles, CNRS, 91198 Gif-sur-Yvette Cedex, France
| | - Jieping Zhu
- Institut de Chimie des Substances Naturelles, CNRS, 91198 Gif-sur-Yvette Cedex, France
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43
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Enantioselective synthesis of martinelline chiral core and its diastereomer using asymmetric tandem Michael–aldol reaction. Tetrahedron 2008. [DOI: 10.1016/j.tet.2008.10.032] [Citation(s) in RCA: 54] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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44
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Kudale AA, Kendall J, Miller DO, Collins JL, Bodwell GJ. Povarov reactions involving 3-aminocoumarins: synthesis of 1,2,3,4-tetrahydropyrido[2,3-c]coumarins and pyrido[2,3-c]coumarins. J Org Chem 2008; 73:8437-47. [PMID: 18821803 DOI: 10.1021/jo801411p] [Citation(s) in RCA: 65] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Condensation of 3-aminocoumarin (5) with 4-nitrobenzaldehyde (8) afforded a 2-azadiene (9), which reacted with various electron-rich alkenes (10 examples) in the presence of Yb(OTf)3 to afford 1,2,3,4-tetrahydropyrido[2,3-c]coumarins. Yields were generally good, but the diastereomeric ratios were highly variable. The products arose through a formal [4 + 2] cycloaddition (inverse electron demand Diels-Alder reaction) followed by tautomerization. As such, these are examples of the Povarov reaction. A range of 1,2,3,4-tetrahydropyrido[2,3-c]coumarins was then synthesized using a three-component version of this reaction, which involves in situ formation of the 2-azadiene component. Some of these products were converted into the corresponding pyrido[2,3-c]coumarins upon treatment with various oxidants, the most effective of which proved to be nitrous gases.
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Affiliation(s)
- Amit A Kudale
- Department of Chemistry, Memorial University, St. John's, NL, Canada A1B 3X7
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45
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Tarantin AV, Glushkov VA, Mayorova OA, Shcherbinina IA, Tolstikov AG. The Povarov reaction of ethyl (18-carbomethoxyabieta-8,11,13-triene-12-imino)glyoxylate with electron-donating dienophiles. MENDELEEV COMMUNICATIONS 2008. [DOI: 10.1016/j.mencom.2008.07.005] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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46
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Shirai A, Miyata O, Tohnai N, Miyata M, Procter DJ, Sucunza D, Naito T. Total synthesis of (-)-martinellic acid via radical addition-cyclization-elimination reaction. J Org Chem 2008; 73:4464-75. [PMID: 18473441 DOI: 10.1021/jo800560p] [Citation(s) in RCA: 62] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The asymmetric total synthesis of martinellic acid, the first pyrrolo[3,2-c]quinoline alkaloid found in nature, is described. Three key steps in our synthesis of (-)-martinellic acid are the Bu(3)SnH-promoted radical addition-cyclization-elimination (RACE) reaction of an oxime ether with an alpha,beta-unsaturated ester to generate the pyrrolo[3,2-c]quinoline core, a chemoselective lactam carbonyl reduction, and guanidinylation under Mitsunobu reaction conditions. The key radical cyclization has also been investigated by using SmI(2). (-)-Martinellic acid was synthesized from commercially available methyl 4-bromo-3-methylbenzoate in fewer steps than previous syntheses and in an improved overall yield.
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Affiliation(s)
- Atsushi Shirai
- Kobe Pharmaceutical University, Motoyamakita, Higashinada, Kobe, Japan
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47
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Development of radical addition–cyclization–elimination reaction of oxime ether and its application to formal synthesis of (±)-martinelline. Tetrahedron 2007. [DOI: 10.1016/j.tet.2007.07.007] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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48
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Isambert N, Cruz M, Arévalo MJ, Gómez E, Lavilla R. Enol Esters: Versatile Substrates for Mannich-Type Multicomponent Reactions. Org Lett 2007; 9:4199-202. [PMID: 17867693 DOI: 10.1021/ol701717z] [Citation(s) in RCA: 60] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The interaction of cyclic enol esters with diversely substituted anilines and ethyl glyoxalate yields, under Sc(OTf)3 catalysis, disubstituted N-aryl lactams in a multicomponent reaction. The protocol allows access to the trans stereoisomers after an epimerization of the initial mixture in which the cis isomers predominate. Vinyl acetate yields quinoline derivatives, whereas isopropenyl acetate leads to the corresponding Mannich adducts.
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Affiliation(s)
- Nicolas Isambert
- Institute for Research in Biomedicine, Barcelona Science Park, Josep Samitier 1-5, 08028 Barcelona, Spain
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49
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50
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Ikeda S, Shibuya M, Iwabuchi Y. Asymmetric total synthesis of martinelline and martinellic acid. Chem Commun (Camb) 2006:504-6. [PMID: 17252109 DOI: 10.1039/b611121a] [Citation(s) in RCA: 62] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Herein, we describe the first asymmetric total synthesis of (-)-martinelline ((-)-2) and the second total synthesis of (-)-martinellic acid ((-)-1) by employing a tandem Mukaiyama-Mannich reaction/aminal cyclization as the key step.
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Affiliation(s)
- Shuhei Ikeda
- Department of Organic Chemistry, Graduate School of Pharmaceutical Sciences, Tohoku University, Aobayama, Sendai 980-8578, Japan
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