1
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Beng TK, Anosike IS, Kaur J. Stereocontrolled and time-honored access to piperidine- and pyrrolidine-fused 3-methylenetetrahydropyrans using lactam-tethered alkenols. RSC Adv 2024; 14:26913-26919. [PMID: 39193285 PMCID: PMC11347980 DOI: 10.1039/d4ra04916k] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2024] [Accepted: 08/19/2024] [Indexed: 08/29/2024] Open
Abstract
Polycyclic oxygen-heterocycles bearing the 3-methylenetetrahydropyran (i.e., 3-MeTHP) motif are resident in bioactive molecules such as hodgsonox and iridoid. Meanwhile, the δ- and γ-lactam topologies as well as their reduced variants (i.e., piperidines and pyrrolidines) are at the core of several pharmaceuticals and fragrances. A stereocontrolled, time-honored, and cost-effective strategy that merges a 3-MeTHP motif with the aforementioned azaheterocyclic scaffolds could exponentially expand the 3D-structural space for the discovery of new small molecules with medicinal value. In these studies, readily affordable lactam-tethered alkenols have been interrogated in two complementary cascade approaches, leading to the regioselective and stereocontrolled synthesis of lactam-fused 3-MeTHPs. The first approach hinges on regioselective 6-endo-trig bromoetherification of the alkenols and concomitant elimination to arrive at the desired 3-MeTHPs. The methylene portion of the 3-MeTHP is unveiled at a late stage, which is noteworthy since all existing approaches to 3-MeTHPs rely on early-stage introduction of the methylene group. The second strategy involves transition metal-catalyzed alkoxylation of the tethered alkenol followed by base-induced double bond isomerization. The lactam-fused 3-MeTHPs are obtained in high site- and diastereo-selectivities. Post-modification of the bicycles has led to the construction of 3-MeTHP-fused saturated piperidines and pyrrolidines as well as 3-MeTHPs bearing four contiguous stereocenters.
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Affiliation(s)
- Timothy K Beng
- Department of Chemistry, Central Washington University Ellensburg WA 98926 USA
| | - Ifeyinwa S Anosike
- Department of Chemistry, Central Washington University Ellensburg WA 98926 USA
| | - Jasleen Kaur
- Department of Chemistry, Central Washington University Ellensburg WA 98926 USA
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2
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Beng TK, Kaur J, Anosike IS, Rentfro B, Newgard S. Revisiting the 1,3-azadiene-succinic anhydride annulation reaction for the stereocontrolled synthesis of allylic 2-oxopyrrolidines bearing up to four contiguous stereocenters. RSC Adv 2024; 14:16678-16684. [PMID: 38784414 PMCID: PMC11110166 DOI: 10.1039/d4ra03156c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2024] [Accepted: 05/15/2024] [Indexed: 05/25/2024] Open
Abstract
Polysubstituted 2-oxopyrrolidines bearing at least two contiguous stereocenters constitute the core of several pharmaceuticals, including clausenamide (antidementia). Here, we describe a flexible annulation strategy, which unites succinic anhydride and 1,3-azadienes to produce allylic 2-oxopyrrolidines bearing contiguous stereocenters. The approach is chemoselective, efficient, modular, scalable, and diastereoselective. The scalable nature of the reactions offers the opportunity for post-diversification, leading to incorporation of motifs with either known pharmaceutical value or that permit subsequent conversion to medicinally relevant entities.
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Affiliation(s)
- Timothy K Beng
- Department of Chemistry, Central Washington University Ellensburg WA 98926 USA
| | - Jasleen Kaur
- Department of Chemistry, Central Washington University Ellensburg WA 98926 USA
| | - Ifeyinwa S Anosike
- Department of Chemistry, Central Washington University Ellensburg WA 98926 USA
| | - Benjamin Rentfro
- Department of Chemistry, Central Washington University Ellensburg WA 98926 USA
| | - Shae Newgard
- Department of Chemistry, Central Washington University Ellensburg WA 98926 USA
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3
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Garcia J, Eichwald J, Zesiger J, Beng TK. Leveraging the 1,3-azadiene-anhydride reaction for the synthesis of functionalized piperidines bearing up to five contiguous stereocenters. RSC Adv 2021; 12:309-318. [PMID: 35424477 PMCID: PMC8978715 DOI: 10.1039/d1ra07390g] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2021] [Accepted: 12/10/2021] [Indexed: 12/25/2022] Open
Abstract
A modular and scalable strategy, which remodels 3-methylglutaric anhydride to 2-oxopiperidines bearing at least three contiguous stereocenters is described. The approach relies on the chemoselective and stereocontrolled annulation of 1,3-azadienes with the anhydride component. The resulting acid-tethered allylic 2-oxopiperidines are then engaged in several selective fragment growth processes, including catalytic denitrative alkenylation, halolactonization, and Vilsmeier-Haack functionalization.
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Affiliation(s)
- Jorge Garcia
- Department of Chemistry, Central Washington University Ellensburg WA 98926 USA
| | - Jane Eichwald
- Department of Chemistry, Central Washington University Ellensburg WA 98926 USA
| | - Jayme Zesiger
- Department of Chemistry, Central Washington University Ellensburg WA 98926 USA
| | - Timothy K Beng
- Department of Chemistry, Central Washington University Ellensburg WA 98926 USA
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4
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Park S, Lee S, Kim JH, Choi WJ, Kim S. Memory of Chirality in the Asymmetric Synthesis of Piperidines with Vicinal Stereocenters by Intramolecular Sn2' Reaction. Chem Asian J 2021; 16:3097-3101. [PMID: 34432952 DOI: 10.1002/asia.202100669] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2021] [Revised: 07/27/2021] [Indexed: 11/10/2022]
Abstract
Intramolecular Sn2' cyclization of α-amino ester enolates provided piperidine derivatives with vicinal quaternary-tertiary stereocenters with excellent diastereo- and enantioselectivity via memory of chirality and the Thorpe-Ingold effect. DFT calculations provided a mechanistic rationale for the increase in chirality preservation via the Thorpe-Ingold effect. This new method has the potential to be integrated into concise asymmetric synthesis of bioactive molecules containing multisubstituted piperidine moieties.
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Affiliation(s)
- Seungbae Park
- College of Pharmacy, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul, 08826, Republic of Korea
| | - Seokwoo Lee
- College of Pharmacy, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul, 08826, Republic of Korea
| | - Jae Hyun Kim
- College of Pharmacy, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul, 08826, Republic of Korea.,College of Pharmacy, Kangwon National University, 1 Kangwondaehak-gil, Chuncheon, Gangwon-do, 24341, Republic of Korea
| | - Won Jun Choi
- College of Pharmacy, Dongguk University-Seoul, Goyang, 410-820, Republic of Korea
| | - Sanghee Kim
- College of Pharmacy, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul, 08826, Republic of Korea
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5
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Marsico G, Scafato P, Belviso S, Superchi S. Regio- and stereoselective intermolecular carbolithiation reactions. RSC Adv 2020; 10:32581-32601. [PMID: 35516521 PMCID: PMC9056694 DOI: 10.1039/d0ra06101h] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2020] [Accepted: 08/22/2020] [Indexed: 01/02/2023] Open
Abstract
Carbolithiation of alkenes provides a powerful tool for the construction of up to two novel carbon–carbon or carbon–heteroatoms bonds in a regio- and stereo-controlled manner. The synthetic potentiality of this reaction is highlighted.
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Affiliation(s)
- G. Marsico
- Dipartimento di Scienze
- Università della Basilicata
- Potenza
- Italy
| | - P. Scafato
- Dipartimento di Scienze
- Università della Basilicata
- Potenza
- Italy
| | - S. Belviso
- Dipartimento di Scienze
- Università della Basilicata
- Potenza
- Italy
| | - S. Superchi
- Dipartimento di Scienze
- Università della Basilicata
- Potenza
- Italy
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6
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Marcote DC, Varela I, Fernández-Casado J, Mascareñas JL, López F. Gold(I)-Catalyzed Enantioselective Annulations between Allenes and Alkene-Tethered Oxime Ethers: A Straight Entry to Highly Substituted Piperidines and aza-Bridged Medium-Sized Carbocycles. J Am Chem Soc 2018; 140:16821-16833. [DOI: 10.1021/jacs.8b10388] [Citation(s) in RCA: 35] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Affiliation(s)
- David C. Marcote
- Centro Singular de Investigación en Química Biolóxica e Materiais Moleculares (CiQUS) and Departamento de Química Orgánica, Universidad de Santiago de Compostela, 15782, Santiago de Compostela, Spain
| | - Iván Varela
- Centro Singular de Investigación en Química Biolóxica e Materiais Moleculares (CiQUS) and Departamento de Química Orgánica, Universidad de Santiago de Compostela, 15782, Santiago de Compostela, Spain
| | - Jaime Fernández-Casado
- Centro Singular de Investigación en Química Biolóxica e Materiais Moleculares (CiQUS) and Departamento de Química Orgánica, Universidad de Santiago de Compostela, 15782, Santiago de Compostela, Spain
| | - José L. Mascareñas
- Centro Singular de Investigación en Química Biolóxica e Materiais Moleculares (CiQUS) and Departamento de Química Orgánica, Universidad de Santiago de Compostela, 15782, Santiago de Compostela, Spain
| | - Fernando López
- Centro Singular de Investigación en Química Biolóxica e Materiais Moleculares (CiQUS) and Departamento de Química Orgánica, Universidad de Santiago de Compostela, 15782, Santiago de Compostela, Spain
- Instituto de Química Orgánica General CSIC, Juan de la Cierva 3, 28006, Madrid, Spain
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7
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Flexible access to 2,3,5,6-tetrasubstituted dehydropiperidines by Ni- or Co-catalyzed site-selective cross-coupling using Vilsmeier-Haack-derived α-chloro-β-formyltetrahydropyridines. Tetrahedron Lett 2018. [DOI: 10.1016/j.tetlet.2018.08.023] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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8
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Hovenkotter K, Braunstein H, Langevin S, Beng TK. Expedient and modular access to 2-azabicyclic architectures by iron-catalyzed dehydrative coupling of alcohol-bearing allylic lactams. Org Biomol Chem 2017; 15:1217-1221. [DOI: 10.1039/c6ob02652d] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A high-yielding, cost-effective, modular and environmentally benign approach to [5,5]- or [6,5]-2-azabicyclic architectures bearing vicinal stereocenters, by Fe-catalyzed dehydrative coupling of readily affordable alcohol-bearing allylic lactams is presented.
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Affiliation(s)
| | | | - Spencer Langevin
- Department of Chemistry
- Central Washington University
- Ellensburg
- USA
| | - Timothy K. Beng
- Department of Chemistry
- Central Washington University
- Ellensburg
- USA
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9
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Braunstein H, Langevin S, Khim M, Adamson J, Hovenkotter K, Kotlarz L, Mansker B, Beng TK. Modular access to vicinally functionalized allylic (thio)morpholinonates and piperidinonates by substrate-controlled annulation of 1,3-azadienes with hexacyclic anhydrides. Org Biomol Chem 2016; 14:8864-8872. [PMID: 27714224 DOI: 10.1039/c6ob01526c] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A modular substrate-controlled hexannulation of 1,3-azadienes with hexacyclic anhydrides, which affords versatile vicinally functionalized allylic lactams, in high yields, regio- and stereoselectivities is described.
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Affiliation(s)
| | - Spencer Langevin
- Department of Chemistry
- Central Washington University
- Ellensburg
- USA
| | - Monique Khim
- Department of Chemistry
- Central Washington University
- Ellensburg
- USA
| | - Jonathan Adamson
- Department of Chemistry
- Central Washington University
- Ellensburg
- USA
| | | | - Lindsey Kotlarz
- Department of Chemistry
- Central Washington University
- Ellensburg
- USA
| | - Brandon Mansker
- Department of Chemistry
- Central Washington University
- Ellensburg
- USA
| | - Timothy K. Beng
- Department of Chemistry
- Central Washington University
- Ellensburg
- USA
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10
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Beng TK, Langevin S, Braunstein H, Khim M. Regiocontrolled synthesis of (hetero)aryl and alkenyl dehydropyrrolidines, dehydropiperidines and azepenes by Ru-catalyzed, heteroatom-directed α-C–H activation/cross-coupling of cyclic enamides with boronic acids. Org Biomol Chem 2016; 14:830-4. [DOI: 10.1039/c5ob02263k] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
The synthesis of α-aryl and alkenyl pyrrolidine-, piperidine-, and azepane derivatives by ruthenium-catalyzed, carbonyl-assisted, site-selective sp2 C–H activation of cyclic enamides and concomitant cross-coupling with boronic acids is described.
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Affiliation(s)
- Timothy K. Beng
- Department of Chemistry
- Central Washington University
- Ellensburg
- USA
| | - Spencer Langevin
- Department of Chemistry
- Central Washington University
- Ellensburg
- USA
| | | | - Monique Khim
- Department of Chemistry
- Central Washington University
- Ellensburg
- USA
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11
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Kotomori Y, Sasaki M, Kawahata M, Yamaguchi K, Takeda K. Stereochemical Course of Deprotonation-Acylation of N-Boc- and N-Carbamoyl-2-cyano-6-methylpiperidines. J Org Chem 2015; 80:11013-20. [PMID: 26457453 DOI: 10.1021/acs.joc.5b02178] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The stereochemical course of electrophilic substitution of α-nitrile metallocarbanions generated by deprotonation from N-Boc- and N-carbamoyl-2-cyano-6-methylpiperidines was investigated. Deprotonation in the presence of an electrophile taking advantage of the high acidity of α-nitrile protons allowed examination of the effects of a chelating group on the nitrogen atom, a countercation, and the reactivity of an electrophile on the steric course. Analyses of reactions using aroyl chlorides and methyl iodide revealed the following: (1) the substitution reactions basically proceed with retention of configuration, (2) the extent of an inversion product increases with decreasing chelating ability of the N-substituent and with increasing leaving ability (ionic character) of a countercation (Li, Na, K) of the anionic species, and (3) the use of a more reactive electrophile results in an increase of the retention product.
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Affiliation(s)
- Yuri Kotomori
- Department of Synthetic Organic Chemistry, Institute of Biomedical & Health Sciences, Hiroshima University , 1-2-3 Kasumi, Minami-Ku, Hiroshima 734-8553, Japan
| | - Michiko Sasaki
- Department of Synthetic Organic Chemistry, Institute of Biomedical & Health Sciences, Hiroshima University , 1-2-3 Kasumi, Minami-Ku, Hiroshima 734-8553, Japan
| | - Masatoshi Kawahata
- Pharmaceutical Sciences at Kagawa Campus, Tokushima Bunri University , 1314-1 Shido, Sanuki, Kagawa 769-2193, Japan
| | - Kentaro Yamaguchi
- Pharmaceutical Sciences at Kagawa Campus, Tokushima Bunri University , 1314-1 Shido, Sanuki, Kagawa 769-2193, Japan
| | - Kei Takeda
- Department of Synthetic Organic Chemistry, Institute of Biomedical & Health Sciences, Hiroshima University , 1-2-3 Kasumi, Minami-Ku, Hiroshima 734-8553, Japan
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