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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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2
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Yamada M, Usutani H, Ito T, Yamano M. Construction of a (3 aR,4 R,9 bR)-Hexahydropyrroloquinoline by Stereoselective Hydrogen-Mediated Domino Cyclization. Org Process Res Dev 2019. [DOI: 10.1021/acs.oprd.8b00365] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Masatoshi Yamada
- Process Chemistry, Pharmaceutical Sciences, Takeda Pharmaceutical Company Limited, 17-85, Jusohonmachi 2-chome, Yodogawa-ku, Osaka, Japan
- Chemical R&D Division, SPERA PHARMA, Inc., 17-85, Jusohonmachi 2-chome, Yodogawa-ku, Osaka, Japan
| | - Hirotsugu Usutani
- Process Chemistry, Pharmaceutical Sciences, Takeda Pharmaceutical Company Limited, 17-85, Jusohonmachi 2-chome, Yodogawa-ku, Osaka, Japan
- Consulting Division, Kyoto University Original Co., Ltd., Yoshida-Honmachi, Sakyo-ku, Kyoto, Japan
| | - Tatsuya Ito
- Process Chemistry, Pharmaceutical Sciences, Takeda Pharmaceutical Company Limited, 17-85, Jusohonmachi 2-chome, Yodogawa-ku, Osaka, Japan
- Process Chemistry, Pharmaceutical Sciences, Takeda Pharmaceutical Company Limited, 26-1, Muraoka-Higashi 2-chome Fujisawa, Kanagawa, Japan
| | - Mitsuhisa Yamano
- Process Chemistry, Pharmaceutical Sciences, Takeda Pharmaceutical Company Limited, 17-85, Jusohonmachi 2-chome, Yodogawa-ku, Osaka, Japan
- Chemical R&D Division, SPERA PHARMA, Inc., 17-85, Jusohonmachi 2-chome, Yodogawa-ku, Osaka, Japan
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3
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Xiao JA, Li J, Xia PJ, Zhou ZF, Deng ZX, Xiang HY, Chen XQ, Yang H. Diastereoselective Intramolecular [3 + 2]-Annulation of Donor-Acceptor Cyclopropane with Imine-Assembling Hexahydropyrrolo[3,2-c]quinolinone Scaffolds. J Org Chem 2016; 81:11185-11194. [PMID: 27783511 DOI: 10.1021/acs.joc.6b02172] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Abstract
An intramolecular [3 + 2]-annulation of amide-linked donor-acceptor cyclopropane with in situ-generated imine is described. As a result, diverse hexahydropyrrolo[3,2-c]quinolinones, as the tricyclic core of martinellines, were efficiently assembled in good to excellent yield (up to 93%) with a good diastereomeric ratio (up to 98:2).
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Affiliation(s)
- Jun-An Xiao
- College of Chemistry and Chemical Engineering, Central South University , Changsha 410083, P. R. China
| | - Jie Li
- College of Chemistry and Chemical Engineering, Central South University , Changsha 410083, P. R. China
| | - Peng-Ju Xia
- College of Chemistry and Chemical Engineering, Central South University , Changsha 410083, P. R. China
| | - Zhao-Fang Zhou
- College of Chemistry and Chemical Engineering, Central South University , Changsha 410083, P. R. China
| | - Zhao-Xu Deng
- College of Chemistry and Chemical Engineering, Central South University , Changsha 410083, P. R. China
| | - Hao-Yue Xiang
- College of Chemistry and Chemical Engineering, Central South University , Changsha 410083, P. R. China
| | - Xiao-Qing Chen
- College of Chemistry and Chemical Engineering, Central South University , Changsha 410083, P. R. China
| | - Hua Yang
- College of Chemistry and Chemical Engineering, Central South University , Changsha 410083, P. R. China
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4
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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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5
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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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6
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Sun C, Hunt DK, Chen CL, Deng Y, He M, Clark RB, Fyfe C, Grossman TH, Sutcliffe JA, Xiao XY. Design, Synthesis, and Biological Evaluation of Hexacyclic Tetracyclines as Potent, Broad Spectrum Antibacterial Agents. J Med Chem 2015; 58:4703-12. [DOI: 10.1021/acs.jmedchem.5b00262] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Cuixiang Sun
- Discovery Chemistry, ‡Microbiology, Tetraphase Pharmaceuticals, 480
Arsenal Street, Watertown, Massachusetts 02472, United States
| | - Diana K. Hunt
- Discovery Chemistry, ‡Microbiology, Tetraphase Pharmaceuticals, 480
Arsenal Street, Watertown, Massachusetts 02472, United States
| | - Chi-Li Chen
- Discovery Chemistry, ‡Microbiology, Tetraphase Pharmaceuticals, 480
Arsenal Street, Watertown, Massachusetts 02472, United States
| | - Yonghong Deng
- Discovery Chemistry, ‡Microbiology, Tetraphase Pharmaceuticals, 480
Arsenal Street, Watertown, Massachusetts 02472, United States
| | - Minsheng He
- Discovery Chemistry, ‡Microbiology, Tetraphase Pharmaceuticals, 480
Arsenal Street, Watertown, Massachusetts 02472, United States
| | - Roger B. Clark
- Discovery Chemistry, ‡Microbiology, Tetraphase Pharmaceuticals, 480
Arsenal Street, Watertown, Massachusetts 02472, United States
| | - Corey Fyfe
- Discovery Chemistry, ‡Microbiology, Tetraphase Pharmaceuticals, 480
Arsenal Street, Watertown, Massachusetts 02472, United States
| | - Trudy H. Grossman
- Discovery Chemistry, ‡Microbiology, Tetraphase Pharmaceuticals, 480
Arsenal Street, Watertown, Massachusetts 02472, United States
| | - Joyce A. Sutcliffe
- Discovery Chemistry, ‡Microbiology, Tetraphase Pharmaceuticals, 480
Arsenal Street, Watertown, Massachusetts 02472, United States
| | - Xiao-Yi Xiao
- Discovery Chemistry, ‡Microbiology, Tetraphase Pharmaceuticals, 480
Arsenal Street, Watertown, Massachusetts 02472, United States
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7
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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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8
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Rh(III)-catalyzed synthesis of (dihydro)quinolines via the annulation of N-sulfonyl 2-aminobenzaldehydes with olefins. CHINESE JOURNAL OF CATALYSIS 2014. [DOI: 10.1016/s1872-2067(14)60160-1] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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9
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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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10
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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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11
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Reagent-free synthesis of 2,3,4-polysubstituted tetrahydroquinolines: application to the formal synthesis of (±)-martinellic acid and martinelline. Tetrahedron Lett 2013. [DOI: 10.1016/j.tetlet.2013.06.028] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
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12
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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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13
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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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14
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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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15
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Sridharan V, Suryavanshi PA, Menéndez JC. Advances in the chemistry of tetrahydroquinolines. Chem Rev 2011; 111:7157-259. [PMID: 21830756 DOI: 10.1021/cr100307m] [Citation(s) in RCA: 773] [Impact Index Per Article: 59.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Affiliation(s)
- Vellaisamy Sridharan
- Departamento de Química Orgánica y Farmacéutica, Facultad de Farmacia, Universidad Complutense, Madrid, Spain
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16
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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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17
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Smith MEB, Gunn RM, Rosivatz E, Mak LH, Woscholski R, Hailes HC. Development of chemical probes: toward the mode of action of a methylene-linked di(aryl acetate) E1. Bioorg Med Chem 2010; 18:4917-27. [PMID: 20591679 DOI: 10.1016/j.bmc.2010.06.017] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2010] [Revised: 06/02/2010] [Accepted: 06/04/2010] [Indexed: 11/18/2022]
Abstract
Analogues of the novel inhibitor of the PI3-K/PKB pathway, 2-[5-(2-chloroethyl)-2-acetoxy-benzyl]-4-(2-chloroethyl)-phenyl acetate (E1), have been prepared and preliminary SAR performed. This established that at least one of the chloroethyl para-substituents could be removed or modified and the ability to inhibit PKB/Akt activation retained. Synthetic methodologies were then developed to methylene-linked aryl acetates for use as molecular probes to identify the target of compound E1.
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Affiliation(s)
- Mark E B Smith
- Department of Chemistry, University College London, 20 Gordon Street, London, WC1H OAJ, UK
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18
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Viault G, Grée D, Roisnel T, Chandrasekhar S, Grée R. The first synthesis of 2-amino-1,4-dihydroquinolines. Tetrahedron 2009. [DOI: 10.1016/j.tet.2009.10.018] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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19
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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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20
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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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21
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Comesse S, Sanselme M, Daïch A. New and expeditious tandem sequence aza-Michael/intramolecular nucleophilic substitution route to substituted gamma-lactams: synthesis of the tricyclic core of (+/-)-martinellines. J Org Chem 2008; 73:5566-9. [PMID: 18549283 DOI: 10.1021/jo702752w] [Citation(s) in RCA: 64] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
A new and highly diastereoselective tandem reaction aza-Michael/intramolecular nucleophilic substitution is presented. This unprecedented tandem reaction between N-substituted alpha-bromoacetamides and Michael acceptors proceeds with good yields and excellent diastereoselectivity to provide the corresponding trisubstituted gamma-lactam systems. An application to the concise synthesis of the tricyclic core of (+/-)-martinelline alkaloids is also described.
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Affiliation(s)
- Sébastien Comesse
- URCOM, EA 3221, UFR des Sciences & Techniques, Université du Havre, 25 rue Philippe Lebon, BP 540, F-76058 Le Havre Cedex, France.
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22
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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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23
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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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24
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Synthesis of 2,6-dimethyl-9-aryl-9-phosphabicyclo[3.3.1]nonanes: their application to asymmetric synthesis of chiral tetrahydroquinolines and relatives. Tetrahedron 2007. [DOI: 10.1016/j.tet.2007.03.078] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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25
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Coldham I, Dobson BC, Fletcher SR, Franklin AI. Intramolecular Dipolar Cycloaddition Reactions to Give Substituted Indoles – A Formal Synthesis of Deethylibophyllidine. European J Org Chem 2007. [DOI: 10.1002/ejoc.200700045] [Citation(s) in RCA: 46] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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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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