1
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He H, Shen X, Ding X, Antilla JC. Enantioselective Mukaiyama-Michael Reaction of β,γ-Unsaturated α-Keto Esters with Silyl Ketene Acetals Catalyzed by a Chiral Magnesium Phosphate. Org Lett 2023; 25:782-787. [PMID: 36700837 DOI: 10.1021/acs.orglett.2c04277] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
We would like to describe an efficient and highly enantioselective Mukaiyama-Michael reaction of silyl ketene acetals with β,γ-unsaturated α-keto esters catalyzed by a chiral magnesium BINOL-derived phosphate. The resulting functionalized 1,5-dicarbonyl adducts are obtained in high yields (up to 96%) and with excellent enantioselectivities (up to 98%) under mild conditions. Two plausible mechanistic pathways were proposed, including a 1,4-addition and a hetero Diels-Alder [4 + 2] cycloaddition.
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Affiliation(s)
- Hualing He
- Department of Chemistry, Zhejiang Sci-Tech University, Hangzhou, Zhejiang Province 310018, P. R. China
| | - Xizhe Shen
- Department of Chemistry, Zhejiang Sci-Tech University, Hangzhou, Zhejiang Province 310018, P. R. China
| | - Xinying Ding
- Department of Chemistry, Zhejiang Sci-Tech University, Hangzhou, Zhejiang Province 310018, P. R. China
| | - Jon C Antilla
- Department of Chemistry, Zhejiang Sci-Tech University, Hangzhou, Zhejiang Province 310018, P. R. China
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2
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Fang J, Min Q, Qin H, Liu F. Intermolecular Acylation with Acylphosphonates as Alkyl Radical Receptor under Metal-Free Conditions. CHINESE J ORG CHEM 2022. [DOI: 10.6023/cjoc202207044] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
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3
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Del Río-Rodríguez R, Laina-Martín V, Fernández-Salas JA, Alemán J. Enantioselective vinylogous Mukaiyama aldol reaction of α-ketoesters under bifunctional organocatalysis. Chem Commun (Camb) 2021; 57:11665-11668. [PMID: 34672305 DOI: 10.1039/d1cc04263g] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A highly enantioselective vinylogous Mukaiyama aldol reaction to ketoesters catalysed by a hydrogen-bond-donor-based bifunctional organocatalyst is presented. The addition of silyloxy dienol ether gives rise to multifunctional chiral tertiary alcohols bearing a versatile α,β-unsaturated aldehyde with excellent enantiocontrol.
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Affiliation(s)
- Roberto Del Río-Rodríguez
- Departamento de Química Orgánica (Módulo 1), Facultad de Ciencias, Universidad Autónoma de Madrid, Madrid 28049, Spain.
| | - Víctor Laina-Martín
- Departamento de Química Orgánica (Módulo 1), Facultad de Ciencias, Universidad Autónoma de Madrid, Madrid 28049, Spain.
| | - Jose A Fernández-Salas
- Departamento de Química Orgánica (Módulo 1), Facultad de Ciencias, Universidad Autónoma de Madrid, Madrid 28049, Spain. .,Institute for Advanced Research in Chemical Sciences (IAdChem), Universidad Autónoma de Madrid, Madrid 28049, Spain
| | - José Alemán
- Departamento de Química Orgánica (Módulo 1), Facultad de Ciencias, Universidad Autónoma de Madrid, Madrid 28049, Spain. .,Institute for Advanced Research in Chemical Sciences (IAdChem), Universidad Autónoma de Madrid, Madrid 28049, Spain
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4
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Laina-Martín V, Humbrías-Martín J, Mas-Ballesté R, Fernández-Salas JA, Alemán J. Enantioselective Inverse-Electron Demand Aza-Diels-Alder Reaction: ipso,α-Selectivity of Silyl Dienol Ethers. ACS Catal 2021; 11:12133-12145. [PMID: 34621594 PMCID: PMC8491166 DOI: 10.1021/acscatal.1c03390] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2021] [Indexed: 12/27/2022]
Abstract
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A highly
efficient enantioselective inverse-electron-demand aza-Diels–Alder
reaction between aza-sulfonyl-1-aza-1,3-butadienes and silyl (di)enol
ethers has been developed. The presented methodology allows the synthesis
of benzofuran-fused 2-piperidinol derivatives with three contiguous
stereocenters in a highly selective manner, as even the hemiaminal
center is completely stereocontrolled. Density functional theory (DFT)
calculations support that the hydrogen-bond donor-based bifunctional
organocatalyst selectively triggers the reaction through the ipso,α-position
of the dienophile, in contrast to the reactivity observed for dienolates
in situ generated from β,γ-unsaturated derivatives. Moreover,
the calculations have clarified the mechanism of the reaction and
the ability of the hydrogen-bond donor core to hydrolyze selectively
the E isomer of the dienol ether. Furthermore, to
demonstrate the applicability of silyl enol ethers as nucleophiles
in the asymmetric synthesis of interesting benzofuran-fused derivatives,
the catalytic system has also been implemented for the highly efficient
installation of an aromatic ring in the piperidine adducts.
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Affiliation(s)
- Víctor Laina-Martín
- Departamento de Química Orgánica (módulo 1), Universidad Autónoma de Madrid, Cantoblanco, 28049 Madrid, Spain
| | - Jorge Humbrías-Martín
- Departamento de Química Orgánica (módulo 1), Universidad Autónoma de Madrid, Cantoblanco, 28049 Madrid, Spain
| | - Rubén Mas-Ballesté
- Departamento de Química Inorgánica (módulo 7), Universidad Autónoma de Madrid, Cantoblanco, 28049 Madrid, Spain
- Institute for Advanced Research in Chemical Sciences (IAdChem), Universidad Autónoma de Madrid, 28049 Madrid, Spain
| | - Jose A. Fernández-Salas
- Departamento de Química Orgánica (módulo 1), Universidad Autónoma de Madrid, Cantoblanco, 28049 Madrid, Spain
- Departamento de Química Inorgánica (módulo 7), Universidad Autónoma de Madrid, Cantoblanco, 28049 Madrid, Spain
| | - José Alemán
- Departamento de Química Orgánica (módulo 1), Universidad Autónoma de Madrid, Cantoblanco, 28049 Madrid, Spain
- Departamento de Química Inorgánica (módulo 7), Universidad Autónoma de Madrid, Cantoblanco, 28049 Madrid, Spain
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5
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Demirbas N, Demirbas A. Organocatalyzed Heterocyclic Transformations In Green Media: A Review. CURRENT ORGANOCATALYSIS 2021. [DOI: 10.2174/2213337207999200805115813] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
Background:
Since the discovery of metal-free catalysts or organocatalysts about twenty
years ago, a number of small molecules with different structures have been used to accelerate organic
transformations. With the development of environmental awareness, to obtain highly efficient
scaffolds, scientists have directed their studies towards synthetic methodologies that minimize
or preferably eliminate the formation of waste, avoid toxic solvents and reagents and use renewable
starting materials as far as possible.
Methods:
In this connection, the organocatalytic reactions providing efficiency and selectivity for
most of the transformations have become an endless topic in organic chemistry since several advantages
from both practical and environmental standpoints. Organocatalysts contributing to the transformation
of reactants into products with the least possible waste production, have been serving the
concept of green chemistry.
Results and Conclusion:
Organocatalysts have been classified based on their binding capacity to
the substrate with covalent or noncovalent interactions involving hydrogen bonding and electrostatic
interaction. Diverse types of small organic compounds including proline and its derivatives,
phase-transfer catalysts, (thio)urease, phosphoric acids, sulfones, N-oxides, guanidines, cinchona
derivatives, aminoindanol, and amino acids have been utilized as hydrogen bonding organocatalysts
in different chemical transformations.
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Affiliation(s)
- Neslihan Demirbas
- Karadeniz Technical University, Department of Chemistry, 61080 Trabzon, Turkey
| | - Ahmet Demirbas
- Karadeniz Technical University, Department of Chemistry, 61080 Trabzon, Turkey
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6
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Bifunctional Cinchona Alkaloid Catalyzed Vinylogous Michael Reaction of 3–Alkylideneoxindole with 4‐Oxo‐enoates: A Route to Chiral γ‐Keto Alkylideneoxindole Esters. ASIAN J ORG CHEM 2020. [DOI: 10.1002/ajoc.202000227] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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7
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Humbrías‐Martín J, Pérez‐Aguilar MC, Mas‐Ballesté R, Dentoni Litta A, Lattanzi A, Della Sala G, Fernández‐Salas JA, Alemán J. Enantioselective Conjugate Azidation of
α,β
‐Unsaturated Ketones under Bifunctional Organocatalysis by Direct Activation of TMSN
3. Adv Synth Catal 2019. [DOI: 10.1002/adsc.201900831] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Affiliation(s)
- Jorge Humbrías‐Martín
- Organic Chemistry Department, Módulo 1Universidad Autónoma de Madrid 28049 Madrid Spain
| | | | - Rubén Mas‐Ballesté
- Inorganic Chemistry Department, Módulo 7Universidad Autónoma de Madrid 28049 Madrid Spain
- Institute for Advanced Research in Chemical Sciences (IAdChem)Universidad Autónoma de Madrid 28049 Madrid Spain
| | - Antonella Dentoni Litta
- Dipartimento di Chimica e Biologia “A. Zambelli”Università degli Studi di Salerno 84084 Fisciano, SA Italy
| | - Alessandra Lattanzi
- Dipartimento di Chimica e Biologia “A. Zambelli”Università degli Studi di Salerno 84084 Fisciano, SA Italy
| | - Giorgio Della Sala
- Dipartimento di Chimica e Biologia “A. Zambelli”Università degli Studi di Salerno 84084 Fisciano, SA Italy
| | | | - José Alemán
- Organic Chemistry Department, Módulo 1Universidad Autónoma de Madrid 28049 Madrid Spain
- Institute for Advanced Research in Chemical Sciences (IAdChem)Universidad Autónoma de Madrid 28049 Madrid Spain
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8
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Yang SM, Karanam P, Wang M, Jang YJ, Yeh YS, Tseng PY, Ganapuram MR, Liou YC, Lin W. A vinylogous Michael addition-triggered quadruple cascade reaction for the enantioselective generation of multiple quaternary stereocenters. Chem Commun (Camb) 2019; 55:1398-1401. [DOI: 10.1039/c8cc09219b] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Abstract
An efficient organocatalytic vinylogous Michael addition-triggered quadruple cascade reaction resulting in fused spiroxindoles bearing multiple quaternary stereocenters is demonstrated from β-trifluoroacetylarylidene indanediones and 3-alkylideneoxindoles.
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Affiliation(s)
- Shu-Mei Yang
- Department of Chemistry
- National Taiwan Normal University
- Taipei 11677
- Republic of China
| | - Praneeth Karanam
- Department of Chemistry
- National Taiwan Normal University
- Taipei 11677
- Republic of China
| | - Min Wang
- Department of Chemistry
- National Taiwan Normal University
- Taipei 11677
- Republic of China
| | - Yeong-Jiunn Jang
- Chinese Medicine Research and Development Center
- China Medical University Hospital
- Taichung 40447
- Republic of China
| | - Yu-Sheng Yeh
- Department of Chemistry
- National Taiwan Normal University
- Taipei 11677
- Republic of China
| | - Ping-Yao Tseng
- Department of Chemistry
- National Taiwan Normal University
- Taipei 11677
- Republic of China
| | | | - Yan-Cheng Liou
- Department of Chemistry
- National Taiwan Normal University
- Taipei 11677
- Republic of China
| | - Wenwei Lin
- Department of Chemistry
- National Taiwan Normal University
- Taipei 11677
- Republic of China
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