1
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Horst B, Verdoorn DS, Hennig S, van der Heijden G, Ruijter E. Enantioselective Total Synthesis of (-)-Limaspermidine and (-)-Kopsinine by a Nitroaryl Transfer Cascade Strategy. Angew Chem Int Ed Engl 2022; 61:e202210592. [PMID: 36004723 PMCID: PMC9826323 DOI: 10.1002/anie.202210592] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2022] [Indexed: 01/11/2023]
Abstract
We report an intramolecular conjugate addition/Truce-Smiles/E1cb cascade of 2-nitrobenzenesulfonamide-functionalized cyclohexenones as a new entry to the core scaffold of monoterpene indole alkaloids. The method was applied to the asymmetric total synthesis of (-)-limaspermidine, (-)-kopsinilam, and (-)-kopsinine, as well as the framework of the kopsifoline alkaloids, thus highlighting its complementarity to existing approaches involving the use of indole-based starting materials or the interrupted Fischer indole synthesis. Furthermore, we show that the cascade tolerates various substituents on the nitroarene, opening the way to other natural products as well as non-natural analogues.
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Affiliation(s)
- Brendan Horst
- Department of Chemistry and Pharmaceutical SciencesAmsterdam Institute of Molecular and Life Sciences (AIMMS)De Boelelaan 11081081 HZAmsterdamThe Netherlands
| | - Daniël S. Verdoorn
- Department of Chemistry and Pharmaceutical SciencesAmsterdam Institute of Molecular and Life Sciences (AIMMS)De Boelelaan 11081081 HZAmsterdamThe Netherlands
| | - Sven Hennig
- Department of Chemistry and Pharmaceutical SciencesAmsterdam Institute of Molecular and Life Sciences (AIMMS)De Boelelaan 11081081 HZAmsterdamThe Netherlands
| | - Gydo van der Heijden
- Department of Chemistry and Pharmaceutical SciencesAmsterdam Institute of Molecular and Life Sciences (AIMMS)De Boelelaan 11081081 HZAmsterdamThe Netherlands
| | - Eelco Ruijter
- Department of Chemistry and Pharmaceutical SciencesAmsterdam Institute of Molecular and Life Sciences (AIMMS)De Boelelaan 11081081 HZAmsterdamThe Netherlands
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2
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Horst B, Verdoorn DS, Hennig S, van der Heijden G, Ruijter E. Enantioselective Total Synthesis of (–)‐Limaspermidine and (–)‐Kopsinine by a Nitroaryl Transfer Cascade Strategy. Angew Chem Int Ed Engl 2022. [DOI: 10.1002/ange.202210592] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Brendan Horst
- Vrije Universiteit Amsterdam Chemistry & Pharmaceutical Sciences NETHERLANDS
| | - Daniël S. Verdoorn
- Vrije Universiteit Amsterdam Chemistry & Pharmaceutical Sciences NETHERLANDS
| | - Sven Hennig
- Vrije Universiteit Amsterdam Chemistry & Pharmaceutical Sciences NETHERLANDS
| | | | - Eelco Ruijter
- Vrije Universiteit Amsterdam Chemistry & Pharmaceutical Sciences De Boelelaan 11081081 HZNetherlands 1081 HZ Amsterdam NETHERLANDS
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3
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Qin B, Wang Y, Wang X, Jia Y. Total synthesis of kopsine, fruticosine, and structurally related polycyclic caged Kopsia indole alkaloids. Org Chem Front 2021. [DOI: 10.1039/d0qo01165g] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
Kopsine, fruticosine and related caged and polycyclic Kopsia indole alkaloids have been attractive synthetic targets since 1983.
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Affiliation(s)
- Bo Qin
- State Key Laboratory of Natural and Biomimetic Drugs
- School of Pharmaceutical Sciences
- Peking University
- Beijing 100191
- China
| | - Yuan Wang
- State Key Laboratory of Natural and Biomimetic Drugs
- School of Pharmaceutical Sciences
- Peking University
- Beijing 100191
- China
| | - Xin Wang
- State Key Laboratory of Natural and Biomimetic Drugs
- School of Pharmaceutical Sciences
- Peking University
- Beijing 100191
- China
| | - Yanxing Jia
- State Key Laboratory of Natural and Biomimetic Drugs
- School of Pharmaceutical Sciences
- Peking University
- Beijing 100191
- China
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4
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Jeon T, Kang H, Svirid A, Lyakhov A, Kovalenko V, Cho C. Chiral Resolution of Racemic 2‐Pyrone Diels‐Alder Cycloadduct by Diastereomeric Salt Formation. B KOREAN CHEM SOC 2019. [DOI: 10.1002/bkcs.11838] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Affiliation(s)
- Tae‐Hong Jeon
- Center for New Directions in Organic Synthesis, Department of ChemistryHanyang University Seoul 04763 Republic of Korea
| | - Hyung‐Joon Kang
- Center for New Directions in Organic Synthesis, Department of ChemistryHanyang University Seoul 04763 Republic of Korea
| | - Anastasia Svirid
- Department of Natural SciencesBelarusian State Pedagogical University Minsk 220030 Republic of Belarus
| | - Alexander Lyakhov
- Department of Chemistry and Research Institute for Physical Chemical ProblemsBelarusian State University Minsk 220030 Republic of Belarus
| | - Vitaly Kovalenko
- Department of Natural SciencesBelarusian State Pedagogical University Minsk 220030 Republic of Belarus
- Department of Chemistry and Research Institute for Physical Chemical ProblemsBelarusian State University Minsk 220030 Republic of Belarus
| | - Cheon‐Gyu Cho
- Center for New Directions in Organic Synthesis, Department of ChemistryHanyang University Seoul 04763 Republic of Korea
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5
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Zhang J, Shukla V, Boger DL. Inverse Electron Demand Diels-Alder Reactions of Heterocyclic Azadienes, 1-Aza-1,3-Butadienes, Cyclopropenone Ketals, and Related Systems. A Retrospective. J Org Chem 2019; 84:9397-9445. [PMID: 31062977 DOI: 10.1021/acs.joc.9b00834] [Citation(s) in RCA: 69] [Impact Index Per Article: 13.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
A summary of the investigation and applications of the inverse electron demand Diels-Alder reaction is provided that have been conducted in our laboratory over a period that now spans more than 35 years. The work, which continues to provide solutions to complex synthetic challenges, is presented in the context of more than 70 natural product total syntheses in which the reactions served as a key strategic step in the approach. The studies include the development and use of the cycloaddition reactions of heterocyclic azadienes (1,2,4,5-tetrazines; 1,2,4-, 1,3,5-, and 1,2,3-triazines; 1,2-diazines; and 1,3,4-oxadiazoles), 1-aza-1,3-butadienes, α-pyrones, and cyclopropenone ketals. Their applications illustrate the power of the methodology, often provided concise and nonobvious total syntheses of the targeted natural products, typically were extended to the synthesis of analogues that contain deep-seated structural changes in more comprehensive studies to explore or optimize their biological properties, and highlight a wealth of opportunities not yet tapped.
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Affiliation(s)
- Jiajun Zhang
- Department of Chemistry and The Skaggs Institute for Chemical Biology , The Scripps Research Institute , 10550 North Torrey Pines Road , La Jolla , California 92037 , United States
| | - Vyom Shukla
- Department of Chemistry and The Skaggs Institute for Chemical Biology , The Scripps Research Institute , 10550 North Torrey Pines Road , La Jolla , California 92037 , United States
| | - Dale L Boger
- Department of Chemistry and The Skaggs Institute for Chemical Biology , The Scripps Research Institute , 10550 North Torrey Pines Road , La Jolla , California 92037 , United States
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6
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Saya JM, Ruijter E, Orru RVA. Total Synthesis of
Aspidosperma
and
Strychnos
Alkaloids through Indole Dearomatization. Chemistry 2019; 25:8916-8935. [DOI: 10.1002/chem.201901130] [Citation(s) in RCA: 80] [Impact Index Per Article: 16.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2019] [Indexed: 01/07/2023]
Affiliation(s)
- Jordy M. Saya
- Department of Chemistry & Pharmaceutical Sciences, Amsterdam Institute for Molecules, Medicines & SystemsVrije Universiteit Amsterdam De Boelelaan 1108 1081 HZ Amsterdam The Netherlands
| | - Eelco Ruijter
- Department of Chemistry & Pharmaceutical Sciences, Amsterdam Institute for Molecules, Medicines & SystemsVrije Universiteit Amsterdam De Boelelaan 1108 1081 HZ Amsterdam The Netherlands
| | - Romano V. A. Orru
- Department of Chemistry & Pharmaceutical Sciences, Amsterdam Institute for Molecules, Medicines & SystemsVrije Universiteit Amsterdam De Boelelaan 1108 1081 HZ Amsterdam The Netherlands
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7
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Reyes-Rodríguez GJ, Rezayee NM, Vidal-Albalat A, Jørgensen KA. Prevalence of Diarylprolinol Silyl Ethers as Catalysts in Total Synthesis and Patents. Chem Rev 2019; 119:4221-4260. [DOI: 10.1021/acs.chemrev.8b00583] [Citation(s) in RCA: 77] [Impact Index Per Article: 15.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Affiliation(s)
| | - Nomaan M. Rezayee
- Department of Chemistry, Aarhus University, DK-8000 Aarhus C, Denmark
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8
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Zhang W, Lin S, Du C, Feng S, Liu Z, Zhang J, Xie X, Wang X, Li H, She X. Total Synthesis of Aspidofractinine Alkaloid Paucidirinine. J Org Chem 2019; 84:1111-1116. [PMID: 30562463 DOI: 10.1021/acs.joc.8b03023] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The first total synthesis of paucidirinine (1d), a highly congested aspidofractinine alkaloid containing a special contracted five-membered lactam ring, was achieved in 10 steps with 8% overall yield from commercially available materials. Several key maneuvers, including tandem enamination/[4 + 2] cycloaddition reaction and SmI2-promoted radical cyclization, were featured in this potentially scalable strategy.
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Affiliation(s)
- Weiwei Zhang
- State Key Laboratory of Applied Organic Chemistry, Department of Chemistry , Lanzhou University , Lanzhou 730000 , People's Republic of China
| | - Shanhao Lin
- State Key Laboratory of Applied Organic Chemistry, Department of Chemistry , Lanzhou University , Lanzhou 730000 , People's Republic of China
| | - Chenglong Du
- State Key Laboratory of Applied Organic Chemistry, Department of Chemistry , Lanzhou University , Lanzhou 730000 , People's Republic of China
| | - Shangbiao Feng
- State Key Laboratory of Applied Organic Chemistry, Department of Chemistry , Lanzhou University , Lanzhou 730000 , People's Republic of China
| | - Zaimin Liu
- State Key Laboratory of Applied Organic Chemistry, Department of Chemistry , Lanzhou University , Lanzhou 730000 , People's Republic of China
| | - Jing Zhang
- State Key Laboratory of Applied Organic Chemistry, Department of Chemistry , Lanzhou University , Lanzhou 730000 , People's Republic of China
| | - Xingang Xie
- State Key Laboratory of Applied Organic Chemistry, Department of Chemistry , Lanzhou University , Lanzhou 730000 , People's Republic of China
| | - Xiaolei Wang
- State Key Laboratory of Applied Organic Chemistry, Department of Chemistry , Lanzhou University , Lanzhou 730000 , People's Republic of China
| | - Huilin Li
- State Key Laboratory of Applied Organic Chemistry, Department of Chemistry , Lanzhou University , Lanzhou 730000 , People's Republic of China
| | - Xuegong She
- State Key Laboratory of Applied Organic Chemistry, Department of Chemistry , Lanzhou University , Lanzhou 730000 , People's Republic of China
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9
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Yarlagadda S, Sankaram GS, Balasubramanian S, Subba Reddy BV. Asymmetric Robinson Annulation of 3-Indolinone-2-carboxylates with Cyclohexenone: Access to Chiral Bridged Tricyclic Hydrocarbazoles. Org Lett 2018; 20:4195-4199. [DOI: 10.1021/acs.orglett.8b01575] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
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10
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Kirillova MS, Miloserdov FM, Echavarren AM. Total syntheses of pyrroloazocine indole alkaloids: challenges and reaction discovery. Org Chem Front 2018. [DOI: 10.1039/c7qo00786h] [Citation(s) in RCA: 42] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
Total syntheses of pyrroloazocine indole alkaloids (lapidilectines, grandilodines, lundurines and tenuisines) are discussed in terms of existing retrosynthetic solutions and novel reaction discoveries.
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Affiliation(s)
- Mariia S. Kirillova
- Institute of Chemical Research of Catalonia (ICIQ)
- Barcelona Institut of Science and Technology
- 43007 Tarragona
- Spain
| | - Fedor M. Miloserdov
- Institute of Chemical Research of Catalonia (ICIQ)
- Barcelona Institut of Science and Technology
- 43007 Tarragona
- Spain
| | - Antonio M. Echavarren
- Institute of Chemical Research of Catalonia (ICIQ)
- Barcelona Institut of Science and Technology
- 43007 Tarragona
- Spain
- Departament de Química Analítica i Química Orgànica
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11
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Recent Advances in Substrate-Controlled Asymmetric Cyclization for Natural Product Synthesis. Molecules 2017; 22:molecules22071069. [PMID: 28672881 PMCID: PMC6152324 DOI: 10.3390/molecules22071069] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2017] [Accepted: 06/21/2017] [Indexed: 02/03/2023] Open
Abstract
Asymmetric synthesis of naturally occurring diverse ring systems is an ongoing and challenging research topic. A large variety of remarkable reactions utilizing chiral substrates, auxiliaries, reagents, and catalysts have been intensively investigated. This review specifically describes recent advances in successful asymmetric cyclization reactions to generate cyclic architectures of various natural products in a substrate-controlled manner.
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12
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Archer RM, Hutchby M, Winn CL, Fossey JS, Bull SD. A chiral ligand mediated aza-conjugate addition strategy for the enantioselective synthesis of β-amino esters that contain hydrogenolytically sensitive functionality. Tetrahedron 2015. [DOI: 10.1016/j.tet.2015.08.018] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
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13
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Nishimura K, Fukuyama N, Yasuhara T, Yamashita M, Sumiyoshi T, Yamamoto Y, Yamada KI, Tomioka K. A short synthesis of (+)-β-lycorane by asymmetric conjugate addition cascade. Tetrahedron 2015. [DOI: 10.1016/j.tet.2015.03.014] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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14
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Morikawa T, Harada S, Nishida A. Chiral Holmium Complex-Catalyzed Synthesis of Hydrocarbazole from Siloxyvinylindole and Its Application to the Enantioselective Total Synthesis of (−)-Minovincine. J Org Chem 2015; 80:8859-67. [DOI: 10.1021/acs.joc.5b01393] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Takahiro Morikawa
- Graduate
School of Pharmaceutical
Sciences, Chiba University, 1-8-1 Inohana,
Chuo-ku, Chiba 260-8675, Japan
| | - Shinji Harada
- Graduate
School of Pharmaceutical
Sciences, Chiba University, 1-8-1 Inohana,
Chuo-ku, Chiba 260-8675, Japan
| | - Atsushi Nishida
- Graduate
School of Pharmaceutical
Sciences, Chiba University, 1-8-1 Inohana,
Chuo-ku, Chiba 260-8675, Japan
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15
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Affiliation(s)
- Ken-ichi Yamada
- Graduate School of Pharmaceutical Sciences; Kyoto University; Kyoto Japan
| | - Kiyoshi Tomioka
- Department of Medicinal Chemistry; Faculty of Pharmaceutical Sciences; Doshisha Women's College of Liberal Arts; Kyoto Japan
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16
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Abstract
The total synthesis of (-)-kopsinine and its unnatural enantiomer is detailed, enlisting a late-stage SmI2-mediated transannular free radical conjugate addition reaction for construction of the core bicyclo[2.2.2]octane ring system with strategic C21-C2 bond formation. Key to the approach is assemblage of the underlying skeleton by an intramolecular [4+2]/[3+2] cycloaddition cascade of a 1,3,4-oxadiazole that provided the precursor C21 functionalized pentacyclic ring system 1 in a single step in which the C3 methyl ester found in the natural product served as a key 1,3,4-oxadiazole substituent, activating it for participation in the initiating Diels-Alder reaction and stabilizing the intermediate 1,3-dipole.
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Affiliation(s)
- Kiyoun Lee
- Department of Chemistry and the Skaggs Institute for Chemical Biology, The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, California 92037
| | - Dale L Boger
- Department of Chemistry and the Skaggs Institute for Chemical Biology, The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, California 92037
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17
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Wu X, Huang J, Guo B, Zhao L, Liu Y, Chen J, Cao W. Enantioselective Michael/aza-Michael/Cyclization Organocascade to Tetracyclic Spiroindolines: Concise Total Synthesis of Kopsinine and Aspidofractine. Adv Synth Catal 2014. [DOI: 10.1002/adsc.201400363] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
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18
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Lee K, Boger DL. Total syntheses of (-)-kopsifoline D and (-)-deoxoapodine: divergent total synthesis via late-stage key strategic bond formation. J Am Chem Soc 2014; 136:3312-7. [PMID: 24499015 PMCID: PMC3985950 DOI: 10.1021/ja500548e] [Citation(s) in RCA: 80] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2014] [Indexed: 01/24/2023]
Abstract
Divergent total syntheses of (-)-kopsifoline D and (-)-deoxoapodine are detailed from a common pentacyclic intermediate 15, enlisting the late-stage formation of two different key strategic bonds (C21-C3 and C21-O-C6) unique to their hexacyclic ring systems that are complementary to its prior use in the total syntheses of kopsinine (C21-C2 bond formation) and (+)-fendleridine (C21-O-C19 bond formation). The combined efforts represent the total syntheses of members of four classes of natural products from a common intermediate functionalized for late-stage formation of four different key strategic bonds uniquely embedded in each natural product core structure. Key to the first reported total synthesis of a kopsifoline that is detailed herein was the development of a transannular enamide alkylation for late-stage formation of the C21-C3 bond with direct introduction of the reactive indolenine C2 oxidation state from a penultimate C21 functionalized Aspidosperma-like pentacyclic intermediate. Central to the assemblage of the underlying Apidosperma skeleton is a powerful intramolecular [4 + 2]/[3 + 2] cycloaddition cascade of a 1,3,4-oxadiazole that provided the functionalized pentacyclic ring system 15 in a single step in which the C3 methyl ester found in the natural products served as a key 1,3,4-oxadiazole substituent, activating it for participation in the initiating Diels-Alder reaction and stabilizing the intermediate 1,3-dipole.
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Affiliation(s)
- Kiyoun Lee
- Department
of Chemistry and
the Skaggs Institute for Chemical Biology, The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, California 92037, United States
| | - Dale L. Boger
- Department
of Chemistry and
the Skaggs Institute for Chemical Biology, The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, California 92037, United States
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19
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Harada S. [Asymmetric syntheses of azacycloalkanes by one-pot [1+2+n] cyclization]. YAKUGAKU ZASSHI 2013; 133:975-82. [PMID: 23995805 DOI: 10.1248/yakushi.13-00157] [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
Enantio- and diastereoselective one-pot synthesis of three- to seven-membered cis-azaheterocycles was achieved using a triggered asymmetric conjugate addition reaction of lithium amide with an enoate, followed by C- and N-alkylation of the resulting lithium 3-aminoenolate with α, ω-dihaloalkane, which can be regarded as a [1+2+n] cyclization. The usefulness of the developed methodology was clearly demonstrated by the short-step asymmetric syntheses of azirinomycin ester, nemonapride, and kopsinine.
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Affiliation(s)
- Shingo Harada
- Graduate School of Pharmaceutical Sciences, Kyoto University, Japan.
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20
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Huang J, Zhao L, Liu Y, Cao W, Wu X. Enantioselective Intermolecular Formal [3 + 3] Cycloaddition of 2,3-Disubstituted Indoles with Acrolein. Org Lett 2013; 15:4338-41. [DOI: 10.1021/ol401809d] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Affiliation(s)
- Jianbiao Huang
- Department of Chemistry, Shanghai University, 99 Shangda Road, Shanghai 200444, China
| | - Long Zhao
- Department of Chemistry, Shanghai University, 99 Shangda Road, Shanghai 200444, China
| | - Yong Liu
- Department of Chemistry, Shanghai University, 99 Shangda Road, Shanghai 200444, China
| | - Weiguo Cao
- Department of Chemistry, Shanghai University, 99 Shangda Road, Shanghai 200444, China
| | - Xiaoyu Wu
- Department of Chemistry, Shanghai University, 99 Shangda Road, Shanghai 200444, China
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21
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One-pot synthesis of N-heterocycles by tandem carbamoylation–oxidative bromolactamization of ω-alkenylmagnesium bromide. Tetrahedron Lett 2013. [DOI: 10.1016/j.tetlet.2013.06.002] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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22
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Yamamoto Y, Nasu H, Tomioka K. NMR studies on the structure of a lithium amide–chiral diether complex for an asymmetric reaction. Tetrahedron 2013. [DOI: 10.1016/j.tet.2013.03.036] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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23
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Critical profiles of chiral diether-mediated asymmetric conjugate aminolithiation of enoate with lithium amide as a key to the total synthesis of (−)-kopsinine. Tetrahedron 2013. [DOI: 10.1016/j.tet.2013.02.035] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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24
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Abstract
The use of a powerful intramolecular [4 + 2]/[3 + 2] cycloaddition cascade of an 1,3,4-oxadiazole in the divergent total synthesis of kopsinine (1), featuring an additional unique SmI(2)-promoted transannular cyclization reaction for formation of the bicyclo[2.2.2]octane central to its hexacyclic ring system, is detailed.
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Affiliation(s)
- Jian Xie
- Department of Chemistry, The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, California 92037, United States
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25
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Harada S, Sakai T, Takasu K, Yamada KI, Yamamoto Y, Tomioka K. General entry to asymmetric one-pot [N + 2 + n] cyclization for the synthesis of three- to seven-membered azacycloalkanes. J Org Chem 2012; 77:7212-22. [PMID: 22894619 DOI: 10.1021/jo301495a] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Enantio- and diastereoselective one-pot synthesis of three- to seven-membered cis-azaheterocycles was achieved using a triggered asymmetric conjugate addition reaction of lithium amide with an enoate, followed by alkylation of the resulting lithium enolate with α,ω-dihaloalkane and N-alkylation. Isomerization of cis-azaheterocycles with a base yielded the trans-product, constituting a one-pot synthesis of cis-azacycles and a two-step synthesis of trans-azacycles. The four-step asymmetric synthesis of nemonapride highlights the general utility of the method.
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Affiliation(s)
- Shingo Harada
- Graduate School of Pharmaceutical Sciences, Kyoto University, Yoshida, Sakyo-ku, Kyoto 606-8501, Japan
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