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Weiser M, Pálvölgyi ÁM, Weil M, Bica-Schröder K. Continuous Enantioselective α-Alkylation of Ketones via Direct Photoexcitation. J Org Chem 2024. [PMID: 38856707 DOI: 10.1021/acs.joc.4c00759] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/11/2024]
Abstract
Motivated by the scarcity of enantioselective direct intermolecular α-alkylation reactions of ketones with simple alkyl halides, we report a photo-organocatalytic process to access diethyl 2-(2-oxocyclohexyl)malonate and derivatives in good yield and enantioselectivity. The reaction design is based on highly abundant and nature-derived 9-amino-9-deoxy-epi-cinchona alkaloids to activate ketones as transient secondary enamines, which exist unfavorably in equilibrium with imines. These condensed species can serve as powerful photoinitiators via direct photoexcitation. This concept provides access to both enantiomeric antipodes. In addition to introducing an uncomplicated batch-optimized procedure, we investigated the feasibility and limitations of implementing the reaction in continuous flow, thus enabling to obtain diethyl 2-(2-oxocyclohexyl)malonate with a productivity of 47 μmol/h and 84% enantioselectivity.
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Affiliation(s)
- Michael Weiser
- Institute of Applied Synthetic Chemistry, TU Wien, 1060 Vienna, Austria
| | | | - Matthias Weil
- Institute of Chemical Technologies and Analytics, TU Wien, 1060 Vienna, Austria
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2
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Molnár M, Kappe CO, Ötvös SB. Merger of Visible Light-Driven Chiral Organocatalysis and Continuous Flow Chemistry: An Accelerated and Scalable Access into Enantioselective α-Alkylation of Aldehydes. Adv Synth Catal 2023; 365:1660-1670. [PMID: 38515505 PMCID: PMC10952295 DOI: 10.1002/adsc.202300289] [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: 03/28/2023] [Revised: 04/21/2023] [Indexed: 03/23/2024]
Abstract
The electron donor-acceptor complex-enabled asymmetric photochemical alkylation strategy holds potential to attain elusive chiral α-alkylated aldehydes without an external photoredox catalyst. The photosensitizer-free conditions are beneficial concerning process costs and sustainability. However, lengthy organocatalyst preparation steps as well as limited productivity and difficult scalability render the current approaches unsuitable for synthesis on enlarged scales. Inspired by these limitations, a protocol was developed for the enantioselective α-alkylation of aldehydes based on the synergistic combination of visible light-driven asymmetric organocatalysis and a controlled continuous flow reaction environment. With the aim to reduce process costs, a commercially available chiral catalyst has been exploited to achieve photosensitizer-free enantioselective α-alkylations using phenacyl bromide derivates as alkylating agents. As a result of elaborate optimization and process development, the present flow strategy furnishes an accelerated and inherently scalable entry into enantioenriched α-alkylated aldehydes including a chiral key intermediate of the antirheumatic esonarimod.
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Affiliation(s)
- Márk Molnár
- Institute of ChemistryUniversity of GrazNAWI Graz, Heinrichstrasse 28A-8010GrazAustria
- Servier Research Institute of Medicinal ChemistryZáhony u. 71031BudapestHungary
| | - C. Oliver Kappe
- Institute of ChemistryUniversity of GrazNAWI Graz, Heinrichstrasse 28A-8010GrazAustria
- Center for Continuous Flow Synthesis and Processing (CC FLOW)Research Center Pharmaceutical Engineering GmbH (RCPE)Inffeldgasse 13A-8010GrazAustria
| | - Sándor B. Ötvös
- Institute of ChemistryUniversity of GrazNAWI Graz, Heinrichstrasse 28A-8010GrazAustria
- Center for Continuous Flow Synthesis and Processing (CC FLOW)Research Center Pharmaceutical Engineering GmbH (RCPE)Inffeldgasse 13A-8010GrazAustria
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3
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Xu J, Song Y, Yang J, Yang B, Su Z, Lin L, Feng X. Sterically Hindered and Deconjugative α-Regioselective Asymmetric Mannich Reaction of Meinwald Rearrangement-Intermediate. Angew Chem Int Ed Engl 2023; 62:e202217887. [PMID: 36700493 DOI: 10.1002/anie.202217887] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2022] [Revised: 01/22/2023] [Accepted: 01/24/2023] [Indexed: 01/27/2023]
Abstract
Compared to γ-addition, the α-addition of α-branched β,γ-unsaturated aldehydes faces larger steric hindrance and disrupts the π-π conjugation, which might be why very few examples are reported. In this article, a highly diastereo- and enantioselective α-regioselective Mannich reaction of isatin-derived ketimines with α-, β- or γ-branched β,γ-unsaturated aldehydes, generated in situ from Meinwald rearrangement of vinyl epoxides, is realized by using chiral N,N'-dioxide/ScIII catalysts. A series of chiral α-quaternary allyl aldehydes and homoallylic alcohols with vicinal multisubstituted stereocenters are constructed in excellent yields, good d.r. and excellent ee values. Experimental studies and DFT (density functional theory) calculations reveal that the large steric hindrance of the ligand and the Boc (tButyloxy carbonyl) protecting group of imines are critical factors for the α-regioselectivity.
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Affiliation(s)
- Jinxiu Xu
- Key Laboratory of Green Chemistry & Technology, Ministry of Education, College of Chemistry, Sichuan University, 610064, Chengdu, China
| | - Yanji Song
- Key Laboratory of Green Chemistry & Technology, Ministry of Education, College of Chemistry, Sichuan University, 610064, Chengdu, China
| | - Jia Yang
- Key Laboratory of Green Chemistry & Technology, Ministry of Education, College of Chemistry, Sichuan University, 610064, Chengdu, China
| | - Bingqian Yang
- Key Laboratory of Green Chemistry & Technology, Ministry of Education, College of Chemistry, Sichuan University, 610064, Chengdu, China
| | - Zhishan Su
- Key Laboratory of Green Chemistry & Technology, Ministry of Education, College of Chemistry, Sichuan University, 610064, Chengdu, China
| | - Lili Lin
- Key Laboratory of Green Chemistry & Technology, Ministry of Education, College of Chemistry, Sichuan University, 610064, Chengdu, China
| | - Xiaoming Feng
- Key Laboratory of Green Chemistry & Technology, Ministry of Education, College of Chemistry, Sichuan University, 610064, Chengdu, China
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4
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Yoshida M. Asymmetric Synthesis of a Quaternary Carbon Stereogenic Center by Organocatalysis Using a Primary Amino Acid and Its Salt. CHEM REC 2023:e202200276. [PMID: 36732858 DOI: 10.1002/tcr.202200276] [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: 12/02/2022] [Revised: 01/22/2023] [Indexed: 02/04/2023]
Abstract
In this personal account, our recent developments on the asymmetric synthesis of a quaternary carbon stereogenic center by organocatalysis using a primary amino acid and its salt as a catalyst are described in three chapters: (1) conjugate addition to nitroalkenes and vinyl ketones, (2) nucleophilic addition to π-allyl palladium complexes, and (3) nucleophilic substitution reactions with allyl and propargyl halides. By these methods, asymmetric α-allylation of α-branched aldehydes and ketones smoothly proceeded to give γ-nitroaldehydes, ketoaldehydes, α-allylated aldehydes, and α-allylated β-ketoesters possessing a quaternary carbon stereogenic center in good yields with high enantioselectivities.
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Affiliation(s)
- Masanori Yoshida
- Liberal Arts and Sciences, National Institute of Technology (KOSEN), Asahikawa College, 2-1-6, Shunkodai 2 jo, Asahikawa, Hokkaido, 071-8142, Japan
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5
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St John-Campbell S, Sheppard T. Imine Azaenolates: Synthesis, Reactivity and Outlook. Adv Synth Catal 2022. [DOI: 10.1002/adsc.202200262] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
| | - Tom Sheppard
- University College London UNITED KINGDOM OF GREAT BRITAIN AND NORTHERN IRELAND
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6
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Zhang X, Li X, Sivaguru P, Wu J, Zanoni G, Song JN, Ning Y. Difluorodiazoethane as a masked acetylene equivalent in formal [3 + 2] cycloadditions with ketones to access 2,3-functionalized furans. Org Chem Front 2022. [DOI: 10.1039/d2qo01045c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A transition-metal-free [3+2] cycloaddition of CF2HCHN2 with β-ketones is reported, which enables the synthesis of 2,3-functionalized furans. Sequential defluorination, nucleophilic addition, and cyclization are key elemental steps of the reaction.
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Affiliation(s)
- Xiaolong Zhang
- Jilin Province Key Laboratory of Organic Functional Molecular Design & Synthesis, Department of Chemistry, Northeast Normal University, Changchun 130024, China
| | - Xin Li
- School of Life Science, Jilin University, Changchun 130012, China
| | - Paramasivam Sivaguru
- Jilin Province Key Laboratory of Organic Functional Molecular Design & Synthesis, Department of Chemistry, Northeast Normal University, Changchun 130024, China
| | - Jiayi Wu
- Jilin Province Key Laboratory of Organic Functional Molecular Design & Synthesis, Department of Chemistry, Northeast Normal University, Changchun 130024, China
| | - Giuseppe Zanoni
- Department of Chemistry, University of Pavia, Viale Taramelli 12, Pavia 27100, Italy
| | - Jin-Na Song
- School of Life Science, Jilin University, Changchun 130012, China
| | - Yongquan Ning
- Jilin Province Key Laboratory of Organic Functional Molecular Design & Synthesis, Department of Chemistry, Northeast Normal University, Changchun 130024, China
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7
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Abstract
The asymmetric alkylation of enolates is a particularly versatile method for the construction of α-stereogenic carbonyl motifs, which are ubiquitous in synthetic chemistry. Over the past several decades, the focus has shifted to the development of new catalytic methods that depart from classical stoichiometric stereoinduction strategies (e.g., chiral auxiliaries, chiral alkali metal amide bases, chiral electrophiles, etc.). In this way, the enantioselective alkylation of prochiral enolates greatly improves the step- and redox-economy of this process, in addition to enhancing the scope and selectivity of these reactions. In this review, we summarize the origin and advancement of catalytic enantioselective enolate alkylation methods, with a directed emphasis on the union of prochiral nucleophiles with carbon-centered electrophiles for the construction of α-stereogenic carbonyl derivatives. Hence, the transformative developments for each distinct class of nucleophile (e.g., ketone enolates, ester enolates, amide enolates, etc.) are presented in a modular format to highlight the state-of-the-art methods and current limitations in each area.
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Affiliation(s)
- Timothy B Wright
- Department of Chemistry, Queen's University, 90 Bader Lane, Kingston, Ontario K7L 3N6, Canada
| | - P Andrew Evans
- Department of Chemistry, Queen's University, 90 Bader Lane, Kingston, Ontario K7L 3N6, Canada.,Xiangya School of Pharmaceutical Sciences, Central South University, Changsha 410013, Hunan, P. R. of China
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8
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Yoshida M. Organocatalytic Asymmetric α-Allylation and Propargylation of α-Branched Aldehydes with Alkyl Halides. J Org Chem 2021; 86:10921-10927. [PMID: 34264085 DOI: 10.1021/acs.joc.1c01394] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Enantioselective α-allylation and -propargylation of α-branched aldehydes with alkyl halides was successfully performed using a chiral primary amino acid organocatalyst. This alkylation reaction, involving the generation of a chiral quaternary carbon stereocenter, proceeded smoothly in a mildly basic aqueous solution of potassium hydrogen carbonate to furnish α-allylated or -propargylated aldehydes in a good yield (up to 87%) and high enantioselectivity (up to 96% ee).
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Affiliation(s)
- Masanori Yoshida
- Liberal Arts and Sciences, National Institute of Technology (KOSEN), Asahikawa College Shunkodai 2 jo 2-1-6, Asahikawa, Hokkaido 071-8142, Japan
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9
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García‐Urricelqui A, Cózar A, Campano TE, Mielgo A, Palomo C. syn
‐Selective Michael Reaction of α‐Branched Aryl Acetaldehydes with Nitroolefins Promoted by Squaric Amino Acid Derived Bifunctional Brønsted Bases. European J Org Chem 2021. [DOI: 10.1002/ejoc.202100355] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Affiliation(s)
- Ane García‐Urricelqui
- Departamento de Química Orgánica I Universidad del País Vasco UPV/EHU Manuel Lardizábal 3 20018 San Sebastián Spain
| | - Abel Cózar
- Departamento de Química Orgánica I Universidad del País Vasco UPV/EHU Manuel Lardizábal 3 20018 San Sebastián Spain
- IKERBASQUE Basque Foundation for Science 48009 Blbao Spain
| | - Teresa E. Campano
- Departamento de Química Orgánica I Universidad del País Vasco UPV/EHU Manuel Lardizábal 3 20018 San Sebastián Spain
| | - Antonia Mielgo
- Departamento de Química Orgánica I Universidad del País Vasco UPV/EHU Manuel Lardizábal 3 20018 San Sebastián Spain
| | - Claudio Palomo
- Departamento de Química Orgánica I Universidad del País Vasco UPV/EHU Manuel Lardizábal 3 20018 San Sebastián Spain
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10
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García-Urricelqui A, de Cózar A, Mielgo A, Palomo C. Probing α-Amino Aldehydes as Weakly Acidic Pronucleophiles: Direct Access to Quaternary α-Amino Aldehydes by an Enantioselective Michael Addition Catalyzed by Brønsted Bases. Chemistry 2021; 27:2483-2492. [PMID: 33034390 DOI: 10.1002/chem.202004468] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2020] [Indexed: 12/20/2022]
Abstract
The high tendency of α-amino aldehydes to undergo 1,2-additions and their relatively low stability under basic conditions have largely prevented their use as pronucleophiles in the realm of asymmetric catalysis, particularly for the production of quaternary α-amino aldehydes. Herein, it is demonstrated that the chemistry of α-amino aldehydes may be expanded beyond these limits by documenting the first direct α-alkylation of α-branched α-amino aldehydes with nitroolefins. The reaction produces densely functionalized products bearing up to two, quaternary and tertiary, vicinal stereocenters with high diastereo- and enantioselectivity. DFT modeling leads to the proposal that intramolecular hydrogen bonding between the NH group and the carbonyl oxygen atom in the starting α-amino aldehyde is key for reaction stereocontrol.
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Affiliation(s)
- Ane García-Urricelqui
- Departamento de Química Orgánica I, Universidad del País Vasco UPV/EHU, Manuel Lardizábal 3, 20018, San Sebastián, Spain
| | - Abel de Cózar
- Departamento de Química Orgánica I, Universidad del País Vasco UPV/EHU, Manuel Lardizábal 3, 20018, San Sebastián, Spain.,IKERBASQUE, Basque Foundation for Science, 48009, Bilbao, Spain
| | - Antonia Mielgo
- Departamento de Química Orgánica I, Universidad del País Vasco UPV/EHU, Manuel Lardizábal 3, 20018, San Sebastián, Spain
| | - Claudio Palomo
- Departamento de Química Orgánica I, Universidad del País Vasco UPV/EHU, Manuel Lardizábal 3, 20018, San Sebastián, Spain
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11
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Exo⇔ Endo Isomerism, MEP/DFT, XRD/HSA-Interactions of 2,5-Dimethoxybenzaldehyde: Thermal, 1BNA-Docking, Optical, and TD-DFT Studies. Molecules 2020; 25:molecules25245970. [PMID: 33339423 PMCID: PMC7767059 DOI: 10.3390/molecules25245970] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2020] [Revised: 12/08/2020] [Accepted: 12/11/2020] [Indexed: 11/16/2022] Open
Abstract
The exo⇔endo isomerization of 2,5-dimethoxybenzaldehyde was theoretically studied by density functional theory (DFT) to examine its favored conformers via sp2–sp2 single rotation. Both isomers were docked against 1BNA DNA to elucidate their binding ability, and the DFT-computed structural parameters results were matched with the X-ray diffraction (XRD) crystallographic parameters. XRD analysis showed that the exo-isomer was structurally favored and was also considered as the kinetically preferred isomer, while several hydrogen-bonding interactions detected in the crystal lattice by XRD were in good agreement with the Hirshfeld surface analysis calculations. The molecular electrostatic potential, Mulliken and natural population analysis charges, frontier molecular orbitals (HOMO/LUMO), and global reactivity descriptors quantum parameters were also determined at the B3LYP/6-311G(d,p) level of theory. The computed electronic calculations, i.e., TD-SCF/DFT, B3LYP-IR, NMR-DB, and GIAO-NMR, were compared to the experimental UV–Vis., optical energy gap, FTIR, and 1H-NMR, respectively. The thermal behavior of 2,5-dimethoxybenzaldehyde was also evaluated in an open atmosphere by a thermogravimetric–derivative thermogravimetric analysis, indicating its stability up to 95 °C.
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12
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Gualandi A, Cozzi PG, Rodeghiero G, Jansen TP, Perciaccante R. Stereoselective synergystic organo photoredox catalysis with enamines and iminiums. PHYSICAL SCIENCES REVIEWS 2020. [DOI: 10.1515/psr-2018-0098] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Graphical Abstract
Application of small chiral organic molecules in catalysis has been dominated by formation of chiral enamines or iminium ions. Nucleophiles – electrophiles reactivity has been exploited in many papers. Now, the possibility to combine organocatalysis with photochemistry open new “exciting” possibilities and opportunities, in reactions that are mediated by radicals.
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Affiliation(s)
- Andrea Gualandi
- Università degli Studi di Bologna , Dipartimento di Chimica “G. Ciamician” , via Selmi 2 , 40126 Bologna , Italy
| | - Pier Giorgio Cozzi
- Università degli Studi di Bologna , Dipartimento di Chimica “G. Ciamician” , via Selmi 2 , 40126 Bologna , Italy
| | - Giacomo Rodeghiero
- Chemistry R&D , Cyanagen Srl , Via Stradelli Guelfi 40/C , Bologna 40138 , Italy
| | - Thomas Paul Jansen
- Chemistry R&D , Cyanagen Srl , Via Stradelli Guelfi 40/C , Bologna 40138 , Italy
| | - Rossana Perciaccante
- Chemistry R&D , Cyanagen Srl , Via Stradelli Guelfi 40/C , Bologna 40138 , Italy
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13
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Jena TK, Khan FA. Direct α-Benzylation of Methyl Enol Ethers with Activated Benzyl Alcohols: Its Rearrangement and Access to (±)-Tetrahydronyasol, Propterol A, and 1,3-Diarylpropane. J Org Chem 2019; 84:14270-14280. [PMID: 31545892 DOI: 10.1021/acs.joc.9b02064] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Herein, we report a one-pot Lewis acid mediated synthesis of bi- and triarylpropanal derivatives and their corresponding isomeric ketones from aromatic enol ethers. This transformation takes place via nucleophilic attack of enol ethers to electron-rich benzyl alcohols. The substrate scope of this indicates that it might proceed via quinomethoxy methide as a key intermediate leading to propanal derivatives, and their Wagner-Meerwein rearrangement afforded isomeric ketones. Further, this methodology was applied for the synthesis of (±)-tetrahydronyasol, propterol A, and 1,3-diarylpropane.
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Affiliation(s)
- Tapan Kumar Jena
- Department of Chemistry , Indian Institute of Technology Hyderabad , Kandi, Sangareddy , Telangana 502 285 , India
| | - Faiz Ahmed Khan
- Department of Chemistry , Indian Institute of Technology Hyderabad , Kandi, Sangareddy , Telangana 502 285 , India
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14
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Diaz-Muñoz G, Miranda IL, Sartori SK, de Rezende DC, Alves Nogueira Diaz M. Use of chiral auxiliaries in the asymmetric synthesis of biologically active compounds: A review. Chirality 2019; 31:776-812. [PMID: 31418934 DOI: 10.1002/chir.23103] [Citation(s) in RCA: 26] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2019] [Revised: 05/13/2019] [Accepted: 05/22/2019] [Indexed: 01/16/2023]
Abstract
This review article describes the use of some of the most popular chiral auxiliaries in the asymmetric synthesis of biologically active compounds. Chiral auxiliaries derived from naturally occurring compounds, such as amino acids, carbohydrates, and terpenes, are considered essential tools for the construction of highly complex molecules. We highlight the auxiliaries of Evans, Corey, Yamada, Enders, Oppolzer, and Kunz, which led to remarkable progress in asymmetric synthesis in the last decades and continue to bring advances until the present day.
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Affiliation(s)
- Gaspar Diaz-Muñoz
- Department of Chemistry, Universidade Federal de Minas Gerais, Belo Horizonte, Brazil
| | - Izabel Luzia Miranda
- Department of Chemistry, Universidade Federal de Minas Gerais, Belo Horizonte, Brazil
| | - Suélen Karine Sartori
- Department of Chemistry, Universidade Federal de Minas Gerais, Belo Horizonte, Brazil
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15
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Padmaja VMD, Jangra S, Appayee C. Highly regioselective α-alkylation of α,β,γ,δ-unsaturated aldehydes. Org Biomol Chem 2019; 17:1714-1717. [PMID: 30209495 DOI: 10.1039/c8ob02059k] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The first α-alkylation of α,β,γ,δ-unsaturated aldehydes is achieved under mild reaction conditions. Several α,β,γ,δ-unsaturated aldehydes and diarylcarbinols are successfully tested for the synthesis of MBH-type α-alkylated products with an excellent regioselectivity. Simple pyrrolidine is efficiently used as a catalyst to achieve a perfect E/Z selectivity of the α-alkylated products.
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Affiliation(s)
- Venkata M D Padmaja
- Discipline of Chemistry, Indian Institute of Technology Gandhinagar, Palaj, Gandhinagar, Gujarat 382355, India.
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16
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Mamidala R, Subramani MS, Samser S, Biswal P, Venkatasubbaiah K. Chemoselective Alkylation of Aminoacetophenones with Alcohols by Using a Palladacycle-Phosphine Catalyst. European J Org Chem 2018. [DOI: 10.1002/ejoc.201801155] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Ramesh Mamidala
- School of Chemical Sciences; National Institute of Science Education and Research (NISER), HBNI; 752050 Bhubaneswar Orissa India
| | - M. Siva Subramani
- School of Chemical Sciences; National Institute of Science Education and Research (NISER), HBNI; 752050 Bhubaneswar Orissa India
| | - Shaikh Samser
- School of Chemical Sciences; National Institute of Science Education and Research (NISER), HBNI; 752050 Bhubaneswar Orissa India
| | - Priyabrata Biswal
- School of Chemical Sciences; National Institute of Science Education and Research (NISER), HBNI; 752050 Bhubaneswar Orissa India
| | - Krishnan Venkatasubbaiah
- School of Chemical Sciences; National Institute of Science Education and Research (NISER), HBNI; 752050 Bhubaneswar Orissa India
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17
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Meng J, Fan LF, Han ZY, Gong LZ. α-Quaternary Chiral Aldehydes from Styrenes, Allylic Alcohols, and Syngas via Multi-catalyst Relay Catalysis. Chem 2018. [DOI: 10.1016/j.chempr.2018.03.010] [Citation(s) in RCA: 63] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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18
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Xu MM, Wang HQ, Mao YJ, Mei GJ, Wang SL, Shi F. Cooperative Catalysis-Enabled Asymmetric α-Arylation of Aldehydes Using 2-Indolylmethanols as Arylation Reagents. J Org Chem 2018; 83:5027-5034. [DOI: 10.1021/acs.joc.8b00228] [Citation(s) in RCA: 32] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Affiliation(s)
- Meng-Meng Xu
- School of Chemistry and Materials Science, Jiangsu Normal University, Xuzhou, 221116, China
| | - Hai-Qing Wang
- School of Chemistry and Materials Science, Jiangsu Normal University, Xuzhou, 221116, China
| | - Yu-Jia Mao
- School of Chemistry and Materials Science, Jiangsu Normal University, Xuzhou, 221116, China
| | - Guang-Jian Mei
- School of Chemistry and Materials Science, Jiangsu Normal University, Xuzhou, 221116, China
| | - Shu-Liang Wang
- School of Chemistry and Materials Science, Jiangsu Normal University, Xuzhou, 221116, China
| | - Feng Shi
- School of Chemistry and Materials Science, Jiangsu Normal University, Xuzhou, 221116, China
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19
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Li Y, Jackson KE, Charlton A, Le Neve-Foster B, Khurshid A, Rudy HKA, Thompson AL, Paton RS, Hodgson DM. Asymmetric Induction in C-Alkylation of Tropane-Derived Enamines: Congruence Between Computation and Experiment. J Org Chem 2017; 82:10479-10488. [DOI: 10.1021/acs.joc.7b01954] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Yifei Li
- Department of Chemistry,
Chemistry Research Laboratory, University of Oxford, Mansfield
Road, Oxford OX1 3TA, U.K
| | - Kelvin E. Jackson
- Department of Chemistry,
Chemistry Research Laboratory, University of Oxford, Mansfield
Road, Oxford OX1 3TA, U.K
| | - Andrew Charlton
- Department of Chemistry,
Chemistry Research Laboratory, University of Oxford, Mansfield
Road, Oxford OX1 3TA, U.K
| | - Ben Le Neve-Foster
- Department of Chemistry,
Chemistry Research Laboratory, University of Oxford, Mansfield
Road, Oxford OX1 3TA, U.K
| | - Asma Khurshid
- Department of Chemistry,
Chemistry Research Laboratory, University of Oxford, Mansfield
Road, Oxford OX1 3TA, U.K
| | - Heinrich-K. A. Rudy
- Department of Chemistry,
Chemistry Research Laboratory, University of Oxford, Mansfield
Road, Oxford OX1 3TA, U.K
| | - Amber L. Thompson
- Department of Chemistry,
Chemistry Research Laboratory, University of Oxford, Mansfield
Road, Oxford OX1 3TA, U.K
| | - Robert S. Paton
- Department of Chemistry,
Chemistry Research Laboratory, University of Oxford, Mansfield
Road, Oxford OX1 3TA, U.K
| | - David. M. Hodgson
- 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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Pace V, Castoldi L, Mazzeo E, Rui M, Langer T, Holzer W. Efficient Access to All‐Carbon Quaternary and Tertiary α‐Functionalized Homoallyl‐type Aldehydes from Ketones. Angew Chem Int Ed Engl 2017. [DOI: 10.1002/ange.201706236] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Vittorio Pace
- Department of Pharmaceutical Chemistry University of Vienna Althanstrasse, 14 1090 Vienna Austria
| | - Laura Castoldi
- Department of Pharmaceutical Chemistry University of Vienna Althanstrasse, 14 1090 Vienna Austria
| | - Eugenia Mazzeo
- Department of Pharmaceutical Chemistry University of Vienna Althanstrasse, 14 1090 Vienna Austria
| | - Marta Rui
- Department of Pharmaceutical Chemistry University of Vienna Althanstrasse, 14 1090 Vienna Austria
| | - Thierry Langer
- Department of Pharmaceutical Chemistry University of Vienna Althanstrasse, 14 1090 Vienna Austria
| | - Wolfgang Holzer
- Department of Pharmaceutical Chemistry University of Vienna Althanstrasse, 14 1090 Vienna Austria
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21
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Pace V, Castoldi L, Mazzeo E, Rui M, Langer T, Holzer W. Efficient Access to All-Carbon Quaternary and Tertiary α-Functionalized Homoallyl-type Aldehydes from Ketones. Angew Chem Int Ed Engl 2017; 56:12677-12682. [PMID: 28722252 DOI: 10.1002/anie.201706236] [Citation(s) in RCA: 56] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2017] [Indexed: 12/30/2022]
Abstract
β,γ-Unsaturated aldehydes with all-carbon quaternary or tertiary α-centers were rapidly assembled from ketones through a unique synthetic operation consisting of 1) C1 homologation, 2) Lewis acid mediated epoxide-aldehyde isomerization, and 3) electrophilic trapping. The synthetic equivalence of a vinyl oxirane and a β,γ-unsaturated aldehyde is the key concept of this previously undisclosed tactic. Mechanistic studies and labeling experiments suggest that an aldehyde enolate is a crucial intermediate. The homologating carbenoid formation plays a critical role in determining the chemoselectivity.
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Affiliation(s)
- Vittorio Pace
- Department of Pharmaceutical Chemistry, University of Vienna, Althanstrasse, 14, 1090, Vienna, Austria
| | - Laura Castoldi
- Department of Pharmaceutical Chemistry, University of Vienna, Althanstrasse, 14, 1090, Vienna, Austria
| | - Eugenia Mazzeo
- Department of Pharmaceutical Chemistry, University of Vienna, Althanstrasse, 14, 1090, Vienna, Austria
| | - Marta Rui
- Department of Pharmaceutical Chemistry, University of Vienna, Althanstrasse, 14, 1090, Vienna, Austria
| | - Thierry Langer
- Department of Pharmaceutical Chemistry, University of Vienna, Althanstrasse, 14, 1090, Vienna, Austria
| | - Wolfgang Holzer
- Department of Pharmaceutical Chemistry, University of Vienna, Althanstrasse, 14, 1090, Vienna, Austria
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22
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Touati B, El Bouakher A, Azizi MS, Taillier C, Ben Othman R, Trabelsi-Ayadi M, Antoniotti S, Duñach E, Dalla V. Atom-Economic Catalytic Direct Substitution of N,O-Acetals with Simple Ketones. European J Org Chem 2017. [DOI: 10.1002/ejoc.201700530] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Bahria Touati
- Université du Havre; FR 3032 CNRS; URCOM EA3221; 25, Rue Philippe Lebon, BP 540 76058 Le Havre France
- Laboratoire d'Application de la Chimie aux Ressources et Substances Naturelles et à l'Environnement-LACReSNE-Faculté des Sciences de Bizerte; Université de Carthage; 7021 Bizerte, Carthage Tunisie
| | - Abderrahman El Bouakher
- Université du Havre; FR 3032 CNRS; URCOM EA3221; 25, Rue Philippe Lebon, BP 540 76058 Le Havre France
| | - Mohamed Salah Azizi
- Université du Havre; FR 3032 CNRS; URCOM EA3221; 25, Rue Philippe Lebon, BP 540 76058 Le Havre France
- Laboratoire d'Application de la Chimie aux Ressources et Substances Naturelles et à l'Environnement-LACReSNE-Faculté des Sciences de Bizerte; Université de Carthage; 7021 Bizerte, Carthage Tunisie
| | - Catherine Taillier
- Université du Havre; FR 3032 CNRS; URCOM EA3221; 25, Rue Philippe Lebon, BP 540 76058 Le Havre France
| | - Raja Ben Othman
- Ecole supérieure des sciences et de technologie de Hammam Sousse; Rue Lamine Abassi 4011 H. Sousse Tunisie
| | - Malika Trabelsi-Ayadi
- Laboratoire d'Application de la Chimie aux Ressources et Substances Naturelles et à l'Environnement-LACReSNE-Faculté des Sciences de Bizerte; Université de Carthage; 7021 Bizerte, Carthage Tunisie
| | - Sylvain Antoniotti
- Université Côte d'Azur; C.N.R.S.; Institut de Chimie de Nice; Parc Valrose 06108 Nice cedex 2 France
| | - Elisabet Duñach
- Université Côte d'Azur; C.N.R.S.; Institut de Chimie de Nice; Parc Valrose 06108 Nice cedex 2 France
| | - Vincent Dalla
- Université du Havre; FR 3032 CNRS; URCOM EA3221; 25, Rue Philippe Lebon, BP 540 76058 Le Havre France
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23
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Wright TB, Evans PA. Enantioselective Rhodium-Catalyzed Allylic Alkylation of Prochiral α,α-Disubstituted Aldehyde Enolates for the Construction of Acyclic Quaternary Stereogenic Centers. J Am Chem Soc 2016; 138:15303-15306. [DOI: 10.1021/jacs.6b10099] [Citation(s) in RCA: 50] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Timothy B. Wright
- Department
of Chemistry Queen’s University, 90 Bader Lane, Kingston, Ontario K7L
3N6, Canada
| | - P. Andrew Evans
- Department
of Chemistry Queen’s University, 90 Bader Lane, Kingston, Ontario K7L
3N6, Canada
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24
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Lin L, Romano C, Mazet C. Palladium-Catalyzed Long-Range Deconjugative Isomerization of Highly Substituted α,β-Unsaturated Carbonyl Compounds. J Am Chem Soc 2016; 138:10344-50. [DOI: 10.1021/jacs.6b06390] [Citation(s) in RCA: 146] [Impact Index Per Article: 18.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Affiliation(s)
- Luqing Lin
- Department of Organic Chemistry, University of Geneva, 30 quai Ernest Ansermet, 1211 Geneva, Switzerland
| | - Ciro Romano
- Department of Organic Chemistry, University of Geneva, 30 quai Ernest Ansermet, 1211 Geneva, Switzerland
| | - Clément Mazet
- Department of Organic Chemistry, University of Geneva, 30 quai Ernest Ansermet, 1211 Geneva, Switzerland
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25
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Dighe SU, Mahar R, Shukla SK, Kant R, Srivastava K, Batra S. Synthesis of S-(-)-5,6-Dihydrocanthin-4-ones via a Triple Cooperative Catalysis-Mediated Domino Reaction. J Org Chem 2016; 81:4751-61. [PMID: 27159615 DOI: 10.1021/acs.joc.6b00613] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
An enantioselective synthesis of S-(-)-5,6-dihydrocanthin-4-ones via a triple cooperative catalysis-mediated domino reaction having a broad substrate scope is reported. The reaction between substituted 1-formyl-9H-β-carbolines and terminal alkynes in the presence of catalytic amounts of Jorgensen-Hayashi catalyst, copper iodide, and Hunig base proceeded via a multicascade route, affording the title compounds in good yields and excellent ees with interesting mechanistic features. These compounds were assessed for in vitro antiplasmodial activity against P. falciparum strains. Additionally, 5,6-dihydrocanthin-4-ones are demonstrated to be a versatile precursor to different fused β-carboline derivatives via simple synthetic transformations.
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Affiliation(s)
| | | | - Sanjeev K Shukla
- Academy of Scientific and Innovative Research , New Delhi 110025, India
| | | | - Kumkum Srivastava
- Academy of Scientific and Innovative Research , New Delhi 110025, India
| | - Sanjay Batra
- Academy of Scientific and Innovative Research , New Delhi 110025, India
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26
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Rybicka-Jasińska K, Ciszewski ŁW, Gryko D. Photocatalytic Reaction of Diazo Compounds with Aldehydes. Adv Synth Catal 2016. [DOI: 10.1002/adsc.201600084] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
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27
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Touati B, El Bouakher A, Taillier C, Othman RB, Trabelsi-Ayadi M, Antoniotti S, Duñach E, Dalla V. Enolizable Carbonyls and N,O-Acetals: A Rational Approach for Room-Temperature Lewis Superacid-Catalyzed Direct α-Amidoalkylation of Ketones and Aldehydes. Chemistry 2016; 22:6012-22. [PMID: 26992138 DOI: 10.1002/chem.201504772] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/26/2015] [Indexed: 11/11/2022]
Abstract
An efficient catalytic room-temperature direct α-amidoalkylation of carbonyl donors, that is, ketones and aldehydes with unbiased N,O-acetals, is described. Sn(NTf2 )4 is an optimal catalyst to promote this challenging transformation at low loading and the reaction shows promising scope. A comprehensive and rational evaluation of this reaction has led to the establishment of an empirical scale of nucleophilic reactivity for a broad set of ketones that should be helpful in the synthetic design and development of carbonyl α-functionalization methods.
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Affiliation(s)
- Bahria Touati
- Normandie Univ., UNIHAVRE, CNRS, URCOM, 76600, Le Havre, France.,Laboratoire d'Application de la Chimie aux Ressources et Substances Naturelles et à l'Environnement-, LACReSNE-Faculté des Sciences de Bizerte-, 7021, Bizerte, Université de Carthage, Tunisie
| | | | | | - Raja Ben Othman
- Ecole supérieure des sciences et de technologie de Hammam Sousse, Rue Lamine Abassi, 4011H, Sousse, Tunisie
| | - Malika Trabelsi-Ayadi
- Laboratoire d'Application de la Chimie aux Ressources et Substances Naturelles et à l'Environnement-, LACReSNE-Faculté des Sciences de Bizerte-, 7021, Bizerte, Université de Carthage, Tunisie
| | - Sylvain Antoniotti
- Institut de Chimie de Nice, UMR 7272, Université de Nice Sophia Antipolis, C.N.R.S., Parc Valrose, 06108, Nice cedex 2, France
| | - Elisabet Duñach
- Institut de Chimie de Nice, UMR 7272, Université de Nice Sophia Antipolis, C.N.R.S., Parc Valrose, 06108, Nice cedex 2, France
| | - Vincent Dalla
- Normandie Univ., UNIHAVRE, CNRS, URCOM, 76600, Le Havre, France.
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28
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Ballesteros A, Morán-Poladura P, González JM. Gold(i) operational in synergistic catalysis for the intermolecular α-addition reaction of aldehydes across allenamides. Chem Commun (Camb) 2016; 52:2905-8. [DOI: 10.1039/c5cc09529h] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
A synergistic approach to the catalytic intermolecular α-addition of aldehydes across allenamides using gold(i) and proline derivatives.
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Affiliation(s)
- Alberto Ballesteros
- Departamento de Química Orgánica e Inorgánica
- Instituto Universitario de Química Organometálica “Enrique Moles”
- 33006 Oviedo
- Spain
| | - Pablo Morán-Poladura
- Departamento de Química Orgánica e Inorgánica
- Instituto Universitario de Química Organometálica “Enrique Moles”
- 33006 Oviedo
- Spain
| | - Jose M. González
- Departamento de Química Orgánica e Inorgánica
- Instituto Universitario de Química Organometálica “Enrique Moles”
- 33006 Oviedo
- Spain
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29
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Claraz A, Sahoo G, Berta D, Madarász Á, Pápai I, Pihko PM. A Catalyst Designed for the Enantioselective Construction of Methyl- and Alkyl-Substituted Tertiary Stereocenters. Angew Chem Int Ed Engl 2015; 55:669-73. [DOI: 10.1002/anie.201509302] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2015] [Indexed: 12/26/2022]
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30
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Claraz A, Sahoo G, Berta D, Madarász Á, Pápai I, Pihko PM. A Catalyst Designed for the Enantioselective Construction of Methyl- and Alkyl-Substituted Tertiary Stereocenters. Angew Chem Int Ed Engl 2015. [DOI: 10.1002/ange.201509302] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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31
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Castro-Alvarez A, Carneros H, Sánchez D, Vilarrasa J. Importance of the Electron Correlation and Dispersion Corrections in Calculations Involving Enamines, Hemiaminals, and Aminals. Comparison of B3LYP, M06-2X, MP2, and CCSD Results with Experimental Data. J Org Chem 2015; 80:11977-85. [PMID: 26556606 DOI: 10.1021/acs.joc.5b01814] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
While B3LYP, M06-2X, and MP2 calculations predict the ΔG° values for exchange equilibria between enamines and ketones with similar acceptable accuracy, the M06-2X/6-311+G(d,p) and MP2/6-311+G(d,p) methods are required for enamine formation reactions (for example, for enamine 5a, arising from 3-methylbutanal and pyrrolidine). Stronger disagreement was observed when calculated energies of hemiaminals (N,O-acetals) and aminals (N,N-acetals) were compared with experimental equilibrium constants, which are reported here for the first time. Although it is known that the B3LYP method does not provide a good description of the London dispersion forces, while M06-2X and MP2 may overestimate them, it is shown here how large the gaps are and that at least single-point calculations at the CCSD(T)/6-31+G(d) level should be used for these reaction intermediates; CCSD(T)/6-31+G(d) and CCSD(T)/6-311+G(d,p) calculations afford ΔG° values in some cases quite close to MP2/6-311+G(d,p) while in others closer to M06-2X/6-311+G(d,p). The effect of solvents is similarly predicted by the SMD, CPCM, and IEFPCM approaches (with energy differences below 1 kcal/mol).
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Affiliation(s)
- Alejandro Castro-Alvarez
- Departament de Química Orgànica, Facultat de Química, Universitat de Barcelona , Diagonal 645, 08028 Barcelona, Catalonia, Spain
| | - Héctor Carneros
- Departament de Química Orgànica, Facultat de Química, Universitat de Barcelona , Diagonal 645, 08028 Barcelona, Catalonia, Spain
| | - Dani Sánchez
- Departament de Química Orgànica, Facultat de Química, Universitat de Barcelona , Diagonal 645, 08028 Barcelona, Catalonia, Spain
| | - Jaume Vilarrasa
- Departament de Química Orgànica, Facultat de Química, Universitat de Barcelona , Diagonal 645, 08028 Barcelona, Catalonia, Spain
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32
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Fernández-Valparís J, Romo JM, Romea P, Urpí F, Kowalski H, Font-Bardia M. Stereoselective Alkylation of (S)-N-Acyl-4-isopropyl-1,3-thiazolidine-2-thiones Catalyzed by (Me3P)2NiCl2. Org Lett 2015; 17:3540-3. [DOI: 10.1021/acs.orglett.5b01626] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Javier Fernández-Valparís
- Departament
de Química Orgànica and Institut de Biomedicina de la
Universitat de Barcelona (IBUB), Universitat de Barcelona, Carrer
Martí i Franqués 1-11, 08028 Barcelona, Catalonia, Spain
| | - Juan Manuel Romo
- Departament
de Química Orgànica and Institut de Biomedicina de la
Universitat de Barcelona (IBUB), Universitat de Barcelona, Carrer
Martí i Franqués 1-11, 08028 Barcelona, Catalonia, Spain
| | - Pedro Romea
- Departament
de Química Orgànica and Institut de Biomedicina de la
Universitat de Barcelona (IBUB), Universitat de Barcelona, Carrer
Martí i Franqués 1-11, 08028 Barcelona, Catalonia, Spain
| | - Fèlix Urpí
- Departament
de Química Orgànica and Institut de Biomedicina de la
Universitat de Barcelona (IBUB), Universitat de Barcelona, Carrer
Martí i Franqués 1-11, 08028 Barcelona, Catalonia, Spain
| | - Hubert Kowalski
- Departament
de Química Orgànica and Institut de Biomedicina de la
Universitat de Barcelona (IBUB), Universitat de Barcelona, Carrer
Martí i Franqués 1-11, 08028 Barcelona, Catalonia, Spain
| | - Mercè Font-Bardia
- Unitat de Difracció de RX. CCiTUB. Universitat de Barcelona, Carrer Solé i Sabarís 1-3, 08028 Barcelona, Catalonia, Spain
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33
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Christmann M, Hu J, Kitamura M, Stoltz B. Tetrahedron reports on organic chemistry. Tetrahedron 2015. [DOI: 10.1016/s0040-4020(15)00744-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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34
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Lewis acid mediated diastereoselective intermolecular radical addition/trapping with pyrazolidinone acrylimides. Tetrahedron Lett 2015. [DOI: 10.1016/j.tetlet.2015.02.008] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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35
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Liu YK, Li ZL, Li JY, Feng HX, Tong ZP. Open–Close: An Alternative Strategy to α-Functionalization of Lactone via Enamine Catalysis in One Pot under Mild Conditions. Org Lett 2015; 17:2022-5. [DOI: 10.1021/acs.orglett.5b00794] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Affiliation(s)
- Yan-Kai Liu
- Key
Laboratory of Marine Drugs, Chinese Ministry of Education, School
of Medicine and Pharmacy, Ocean University of China, Qingdao 266003, P. R. China
| | - Zhi-Long Li
- School
of Life Science and Engineering, Southwest Jiaotong University, Chengdu, Sichuan 610031, P. R. China
| | - Ji-Yao Li
- Key
Laboratory of Marine Drugs, Chinese Ministry of Education, School
of Medicine and Pharmacy, Ocean University of China, Qingdao 266003, P. R. China
| | - Huan-Xi Feng
- Key
Laboratory of Marine Drugs, Chinese Ministry of Education, School
of Medicine and Pharmacy, Ocean University of China, Qingdao 266003, P. R. China
| | - Zhi-Ping Tong
- School
of Life Science and Engineering, Southwest Jiaotong University, Chengdu, Sichuan 610031, P. R. China
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36
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Senda Y, Nakajima K, Nishibayashi Y. Cooperative Catalysis: Enantioselective Propargylic Alkylation of Propargylic Alcohols with Enecarbamates Using Ruthenium/Phosphoramide Hybrid Catalysts. Angew Chem Int Ed Engl 2015; 54:4060-4. [DOI: 10.1002/anie.201411601] [Citation(s) in RCA: 46] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2014] [Revised: 12/23/2014] [Indexed: 11/09/2022]
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37
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Senda Y, Nakajima K, Nishibayashi Y. Cooperative Catalysis: Enantioselective Propargylic Alkylation of Propargylic Alcohols with Enecarbamates Using Ruthenium/Phosphoramide Hybrid Catalysts. Angew Chem Int Ed Engl 2015. [DOI: 10.1002/ange.201411601] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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38
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Dang TT, Shan SP, Ramalingam B, Seayad AM. An efficient heterogenized palladium catalyst for N-alkylation of amines and α-alkylation of ketones using alcohols. RSC Adv 2015. [DOI: 10.1039/c5ra07225e] [Citation(s) in RCA: 40] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Silica supported palladium–NiXantphos complex is an efficient and high turnover heterogeneous catalyst for N-alkylation of amines and α-alkylation of ketones using alcohols under neat conditions at 120–140 °C following hydrogen borrowing strategy.
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Affiliation(s)
- Tuan Thanh Dang
- Organic Chemistry
- Institute of Chemical and Engineering Sciences (ICES)
- Singapore 138665
| | - Siah Pei Shan
- Organic Chemistry
- Institute of Chemical and Engineering Sciences (ICES)
- Singapore 138665
| | | | - Abdul Majeed Seayad
- Organic Chemistry
- Institute of Chemical and Engineering Sciences (ICES)
- Singapore 138665
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39
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Franzoni I, Guénée L, Mazet C. A general Pd-catalyzed α- and γ-benzylation of aldehydes for the formation of quaternary centers. Org Biomol Chem 2015; 13:6338-43. [DOI: 10.1039/c5ob00702j] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Abstract
A palladium-catalyzed benzylation of α-branched aldehydes has been developed using benzyl methyl carbonates.
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Affiliation(s)
- Ivan Franzoni
- University of Geneva
- Department of Organic Chemistry
- 1211 Geneva-4
- Switzerland
| | - Laure Guénée
- University of Geneva
- Laboratoire de Cristallographie
- 1211 Geneva-4
- Switzerland
| | - Clément Mazet
- University of Geneva
- Department of Organic Chemistry
- 1211 Geneva-4
- Switzerland
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40
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Porta R, Benaglia M, Puglisi A, Mandoli A, Gualandi A, Cozzi PG. A catalytic reactor for the organocatalyzed enantioselective continuous flow alkylation of aldehydes. CHEMSUSCHEM 2014; 7:3534-3540. [PMID: 25336345 DOI: 10.1002/cssc.201402610] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/30/2014] [Revised: 08/12/2014] [Indexed: 06/04/2023]
Abstract
The use of immobilized metal-free catalysts offers the unique possibility to develop sustainable processes in flow mode. The challenging intermolecular organocatalyzed enantioselective alkylation of aldehydes was performed for the first time under continuous flow conditions. By using a packed-bed reactor filled with readily available supported enantiopure imidazolidinone, different aldehydes were treated with three distinct cationic electrophiles. In the organocatalyzed α-alkylation of aldehydes with 1,3-benzodithiolylium tetrafluoroborate, excellent enantioselectivities, in some cases even better than those obtained in the flask process (up to 95% ee at 25 °C), and high productivity (more than 3800 h(-1) ) were obtained, which thus shows that a catalytic reactor may continuously produce enantiomerically enriched compounds. Treatment of the alkylated products with Raney-nickel furnished enantiomerically enriched α-methyl derivatives, key intermediates for active pharmaceutical ingredients and natural products.
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Affiliation(s)
- Riccardo Porta
- Dipartimento di Chimica, Università degli Studi di Milano, Via Golgi 19, 20133 Milano (Italy)
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41
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Caruana L, Kniep F, Johansen TK, Poulsen PH, Jørgensen KA. A New Organocatalytic Concept for Asymmetric α-Alkylation of Aldehydes. J Am Chem Soc 2014; 136:15929-32. [DOI: 10.1021/ja510475n] [Citation(s) in RCA: 228] [Impact Index Per Article: 22.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Affiliation(s)
- Lorenzo Caruana
- Center for Catalysis, Department
of Chemistry, Aarhus University, DK-8000 Aarhus C, Denmark
| | - Florian Kniep
- Center for Catalysis, Department
of Chemistry, Aarhus University, DK-8000 Aarhus C, Denmark
| | | | - Pernille H. Poulsen
- Center for Catalysis, Department
of Chemistry, Aarhus University, DK-8000 Aarhus C, Denmark
| | - Karl Anker Jørgensen
- Center for Catalysis, Department
of Chemistry, Aarhus University, DK-8000 Aarhus C, Denmark
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Carneros H, Sánchez D, Vilarrasa J. Transfer of 1-Alkenyl Groups between Secondary Amines. Relative Stability and Reactivity of Enamines from Popular Organocatalysts. Org Lett 2014; 16:2900-3. [DOI: 10.1021/ol501044u] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Affiliation(s)
- Héctor Carneros
- Departament
de Química
Orgànica, Facultat de Química, Universitat de Barcelona, Diagonal 645, 08028 Barcelona, Catalonia, Spain
| | - Dani Sánchez
- Departament
de Química
Orgànica, Facultat de Química, Universitat de Barcelona, Diagonal 645, 08028 Barcelona, Catalonia, Spain
| | - Jaume Vilarrasa
- Departament
de Química
Orgànica, Facultat de Química, Universitat de Barcelona, Diagonal 645, 08028 Barcelona, Catalonia, Spain
| |
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