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Ma L, Yu Y, Xin L, Zhu L, Xia J, Ou P, Huang X. Visible Light Enabled Formal Cross Silyl Benzoin Reaction as an Access to α‐Hydroxyketones. Adv Synth Catal 2021. [DOI: 10.1002/adsc.202100186] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Affiliation(s)
- Liyao Ma
- Key Laboratory of Coal to Ethylene Glycol and Its Related Technology Center for Excellence in Molecular Synthesis Fujian Institute of Research on the Structure of Matter Fujian College Chinese Academy of Sciences Fuzhou Fujian 350002 People's Republic of China
- College of Chemistry Fuzhou University Fuzhou 350116 People's Republic of China
| | - Yinghua Yu
- Key Laboratory of Coal to Ethylene Glycol and Its Related Technology Center for Excellence in Molecular Synthesis Fujian Institute of Research on the Structure of Matter Fujian College Chinese Academy of Sciences Fuzhou Fujian 350002 People's Republic of China
| | - Luoting Xin
- Key Laboratory of Coal to Ethylene Glycol and Its Related Technology Center for Excellence in Molecular Synthesis Fujian Institute of Research on the Structure of Matter Fujian College Chinese Academy of Sciences Fuzhou Fujian 350002 People's Republic of China
| | - Lei Zhu
- Key Laboratory of Coal to Ethylene Glycol and Its Related Technology Center for Excellence in Molecular Synthesis Fujian Institute of Research on the Structure of Matter Fujian College Chinese Academy of Sciences Fuzhou Fujian 350002 People's Republic of China
| | - Jiajin Xia
- Key Laboratory of Coal to Ethylene Glycol and Its Related Technology Center for Excellence in Molecular Synthesis Fujian Institute of Research on the Structure of Matter Fujian College Chinese Academy of Sciences Fuzhou Fujian 350002 People's Republic of China
| | - Pengcheng Ou
- Key Laboratory of Coal to Ethylene Glycol and Its Related Technology Center for Excellence in Molecular Synthesis Fujian Institute of Research on the Structure of Matter Fujian College Chinese Academy of Sciences Fuzhou Fujian 350002 People's Republic of China
- College of Chemistry Fuzhou University Fuzhou 350116 People's Republic of China
| | - Xueliang Huang
- Key Laboratory of Chemical Biology and Traditional Chinese Medicine Research Ministry of Education of China Key Laboratory of the Assembly and Application of Organic Functional Molecules of Hunan Province College of Chemistry and Chemical Engineering Hunan Normal University Changsha Hunan 410081 People's Republic of China
- Key Laboratory of Coal to Ethylene Glycol and Its Related Technology Center for Excellence in Molecular Synthesis Fujian Institute of Research on the Structure of Matter Fujian College Chinese Academy of Sciences Fuzhou Fujian 350002 People's Republic of China
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2
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He B, Zheng LS, Phansavath P, Ratovelomanana-Vidal V. Rh III -Catalyzed Asymmetric Transfer Hydrogenation of α-Methoxy β-Ketoesters through DKR in Water: Toward a Greener Procedure. CHEMSUSCHEM 2019; 12:3032-3036. [PMID: 30883037 DOI: 10.1002/cssc.201900358] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/05/2019] [Revised: 03/15/2019] [Indexed: 06/09/2023]
Abstract
The asymmetric reduction of α-methoxy β-ketoesters through transfer hydrogenation with a new rhodium(III) complex was developed. The reaction was efficient in 2-MeTHF with formic acid/triethylamine or in water with sodium formate. The corresponding syn α-methoxy β-hydroxyesters were obtained with high diastereoselectivities and excellent levels of enantioselectivity through a dynamic kinetic resolution process.
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Affiliation(s)
- Bin He
- Chimie ParisTech, CNRS, i-CLeHS (Institute of Chemistry for Life & Health Sciences), CSB2D team, PSL Research University, 75005, Paris, France
| | - Long-Sheng Zheng
- Chimie ParisTech, CNRS, i-CLeHS (Institute of Chemistry for Life & Health Sciences), CSB2D team, PSL Research University, 75005, Paris, France
| | - Phannarath Phansavath
- Chimie ParisTech, CNRS, i-CLeHS (Institute of Chemistry for Life & Health Sciences), CSB2D team, PSL Research University, 75005, Paris, France
| | - Virginie Ratovelomanana-Vidal
- Chimie ParisTech, CNRS, i-CLeHS (Institute of Chemistry for Life & Health Sciences), CSB2D team, PSL Research University, 75005, Paris, France
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3
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Ishida K, Tobita F, Kusama H. Lewis Acid-Assisted Photoinduced Intermolecular Coupling between Acylsilanes and Aldehydes: A Formal Cross Benzoin-Type Condensation. Chemistry 2017; 24:543-546. [DOI: 10.1002/chem.201704776] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2017] [Indexed: 11/07/2022]
Affiliation(s)
- Kento Ishida
- Department of Chemistry; Faculty of Science; Gakushuin University; 1-5-1 Mejiro Toshima-ku Tokyo 171-8588 Japan
| | - Fumiya Tobita
- Department of Chemistry; Faculty of Science; Gakushuin University; 1-5-1 Mejiro Toshima-ku Tokyo 171-8588 Japan
| | - Hiroyuki Kusama
- Department of Chemistry; Faculty of Science; Gakushuin University; 1-5-1 Mejiro Toshima-ku Tokyo 171-8588 Japan
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4
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Bartlett SL, Johnson JS. Synthesis of Complex Glycolates by Enantioconvergent Addition Reactions. Acc Chem Res 2017; 50:2284-2296. [PMID: 28817258 DOI: 10.1021/acs.accounts.7b00263] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
The unique role that stereochemistry plays in molecular recognition events continues to provide a driving force for synthesizing organic compounds in enantioenriched form. The tendency of enantioenriched organic compounds to revert to an entropically favored racemic state in the presence of viable racemization pathways (e.g., the enolization of stereogenic carbonyl derivatives) can sometimes interfere with this objective; however, beginning with Noyori's foundational disclosure of a dynamic kinetic transfer hydrogenation, the ability to channel racemic, configurationally labile starting materials through stereoconvergent reaction pathways has been recognized as a powerful strategy in asymmetric synthesis. Proton transfer, retro-aldol, retro-Michael, reversible redox events, and other processes that can be deleterious to asymmetric synthesis are exploitable in enantioconvergent reactions using chiral small molecules and enzymes as asymmetric catalysts. Enantioselective reduction of configurationally labile carbonyl derivatives bearing a C-H acidic chiral center are particularly common. Because facile racemization is vital to stereocontrol in these transformations, hydrogenations of β-dicarbonyls are commonplace, while less activated substrates have been used less commonly. Our entry into enantioconvergent catalysis evolved from a long-standing interest in the synthesis of complex glycolates and began with the development of a general Noyori-type transfer hydrogenation of α-keto esters. Key innovations in this work include the identification of a new terphenylsulfonamide-Ru(II) complex, which displays unusual preference toward reduction of α-keto esters, and the observation that α-keto esters racemize under mildly basic conditions. This work was extended to the dynamic kinetic hydrogenation of racemic acyl phosphonates. Moreover, the recent recognition that the mechanistic paradigm underlying enantioconvergent hydrogenation chemistry can be extended to diverse carbon-centered nucleophiles has led to advances in the art. Our lab has developed a number of enantioconvergent tertiary alcohol syntheses. In the context of carbon-centered nucleophiles, we have focused on the use of α-keto esters; however, in the latter part of this Account, we will briefly describe our nascent efforts to develop dynamic kinetic additions of carbon-centered nucleophiles to β-oxo acid derivatives. While the enantioconvergent hydrogenation of β-keto acid derivatives is carried out on 100-ton scale annually, non-hydrogenative transformations of these compounds constitute an underexplored subclass of enantioconvergent reactions. With regard to future prospects, a trend toward transformations that afford increasing levels of molecular complexity is apparent. It can be expected that the burgeoning field of asymmetric 1,2-addition chemistry will further drive this chemistry to encompass a wider array of enantioconvergent additions. Additionally, the continued exploration of these chemistries in the context of less conventional electrophiles, as well as identifying novel or overlooked modes of racemization, holds considerable potential.
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Affiliation(s)
- Samuel L. Bartlett
- Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599-3290 United States
| | - Jeffrey S. Johnson
- Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599-3290 United States
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5
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Griswold JA, Horwitz MA, Leiva LV, Johnson JS. Diastereoselective Organocatalytic Addition of α-Angelica Lactone to β-Halo-α-ketoesters. J Org Chem 2017; 82:2276-2280. [PMID: 28164699 DOI: 10.1021/acs.joc.6b03059] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A quinidine-catalyzed diastereoselective addition of α-angelica lactone to β-halo-α-ketoesters is reported. The α-angelica lactone displays unusual regioselectivity in this reaction, acting as a nucleophile at the α-position to provide fully substituted glycolic esters with three contiguous stereocenters. Subsequent diastereoselective hydrogenation provides an additional stereocenter within the lactone.
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Affiliation(s)
- Jessica A Griswold
- Department of Chemistry, University of North Carolina at Chapel Hill , Chapel Hill, North Carolina 27599-3290, United States
| | - Matthew A Horwitz
- Department of Chemistry, University of North Carolina at Chapel Hill , Chapel Hill, North Carolina 27599-3290, United States
| | - Leslie V Leiva
- Department of Chemistry, University of North Carolina at Chapel Hill , Chapel Hill, North Carolina 27599-3290, United States
| | - Jeffrey S Johnson
- Department of Chemistry, University of North Carolina at Chapel Hill , Chapel Hill, North Carolina 27599-3290, United States
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6
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Gaggero N, Pandini S. Advances in chemoselective intermolecular cross-benzoin-type condensation reactions. Org Biomol Chem 2017; 15:6867-6887. [DOI: 10.1039/c7ob01662j] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
An exhaustive and critical overview of synthetically relevant methods for intermolecular cross-acyloin condensation reactions is reported.
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Affiliation(s)
- Nicoletta Gaggero
- Dipartimento di Scienze Farmaceutiche
- Sezione di Chimica Generale e Organica “A. Marchesini”
- Università degli Studi di Milano
- 20133-Milano
- Italia
| | - Stefano Pandini
- Dipartimento di Scienze Farmaceutiche
- Sezione di Chimica Generale e Organica “A. Marchesini”
- Università degli Studi di Milano
- 20133-Milano
- Italia
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7
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Bao DH, Gu XS, Xie JH, Zhou QL. Iridium-Catalyzed Asymmetric Hydrogenation of Racemic β-Keto Lactams via Dynamic Kinetic Resolution. Org Lett 2016; 19:118-121. [DOI: 10.1021/acs.orglett.6b03397] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Deng-Hui Bao
- State
Key Laboratory and Institute of Elemento-organic Chemistry, Nankai University, Tianjin 300071, China
| | - Xue-Song Gu
- State
Key Laboratory and Institute of Elemento-organic Chemistry, Nankai University, Tianjin 300071, China
| | - Jian-Hua Xie
- State
Key Laboratory and Institute of Elemento-organic Chemistry, Nankai University, Tianjin 300071, China
| | - Qi-Lin Zhou
- State
Key Laboratory and Institute of Elemento-organic Chemistry, Nankai University, Tianjin 300071, China
- Collaborative
Innovation Center of Chemical Science and Engineering (Tianjin), Nankai University, Tianjin 300071, China
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8
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Hodgkinson R, Jurčík V, Zanotti-Gerosa A, Nedden HG, Blackaby A, Clarkson GJ, Wills M. Synthesis and Catalytic Applications of an Extended Range of Tethered Ruthenium(II)/η6-Arene/Diamine Complexes. Organometallics 2014. [DOI: 10.1021/om500788t] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Affiliation(s)
- Roy Hodgkinson
- Department
of Chemistry, Warwick University, Coventry, CV4 7AL, U.K
| | - Václav Jurčík
- Johnson Matthey, Catalysis and Chiral Technologies, 28 Cambridge Science Park, Cambridge, CB4 0FP, U.K
| | - Antonio Zanotti-Gerosa
- Johnson Matthey, Catalysis and Chiral Technologies, 28 Cambridge Science Park, Cambridge, CB4 0FP, U.K
| | - Hans Günter Nedden
- Johnson Matthey, Catalysis and Chiral Technologies, 28 Cambridge Science Park, Cambridge, CB4 0FP, U.K
| | - Andrew Blackaby
- Johnson Matthey, Catalysis and Chiral Technologies, 28 Cambridge Science Park, Cambridge, CB4 0FP, U.K
| | - Guy J. Clarkson
- Department
of Chemistry, Warwick University, Coventry, CV4 7AL, U.K
| | - Martin Wills
- Department
of Chemistry, Warwick University, Coventry, CV4 7AL, U.K
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9
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Slade MC, Johnson JS. Alternaric acid: formal synthesis and related studies. Beilstein J Org Chem 2013; 9:166-72. [PMID: 23399952 PMCID: PMC3566800 DOI: 10.3762/bjoc.9.19] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2012] [Accepted: 12/20/2012] [Indexed: 01/26/2023] Open
Abstract
A silyl glyoxylate three-component-coupling methodology has been exploited to achieve a formal synthesis, an analogue to an intermediate in a distinct formal synthetic route, and a third (unique) approach to the natural product alternaric acid. Highlighted in this study is the versatility of silyl glyoxylates to engage a variety of nucleophile and electrophile pairs to provide wide latitude in the approach to complex molecule synthesis.
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Affiliation(s)
- Michael C Slade
- Caudill Laboratories, Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599-3290, USA
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10
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Steward KM, Corbett MT, Goodman CG, Johnson JS. Asymmetric synthesis of diverse glycolic acid scaffolds via dynamic kinetic resolution of α-keto esters. J Am Chem Soc 2012; 134:20197-206. [PMID: 23186551 PMCID: PMC3533366 DOI: 10.1021/ja3102709] [Citation(s) in RCA: 64] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The dynamic kinetic resolution of α-keto esters via asymmetric transfer hydrogenation has been developed as a technique for the highly stereoselective construction of structurally diverse β-substituted-α-hydroxy carboxylic acid derivatives. Through the development of a privileged m-terphenylsulfonamide for (arene)RuCl(monosulfonamide) complexes with a high affinity for selective α-keto ester reduction, excellent levels of chemo-, diastereo-, and enantiocontrol can be realized in the reduction of β-aryl- and β-chloro-α-keto esters.
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Affiliation(s)
| | | | - C. Guy Goodman
- Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, 27599-3290, United States
| | - Jeffrey S. Johnson
- Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, 27599-3290, United States
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11
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Raimondi W, Bonne D, Rodriguez J. Asymmetric transformations involving 1,2-dicarbonyl compounds as pronucleophiles. Chem Commun (Camb) 2012; 48:6763-75. [PMID: 22655291 DOI: 10.1039/c2cc30691c] [Citation(s) in RCA: 46] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
This article concentrates on the versatile nucleophilic reactivity of 1,2-dicarbonyl compounds in various asymmetric transformations. Although underexploited in comparison to their 1,3-dicarbonyl homologues, the presence of adjacent multiple reactive centres allows the selection of specific activation modes for enhancing the reactivity of these important ambident pronucleophiles. They can be involved in selective formation of C-C, C-O or C-N bonds leading to various optically active targets in the acyclic and cyclic series including three- to seven-membered ring systems. Recent contributions in the field of biochemical, organometallic and organic catalytic transformations as well as some relevant stoichiometric approaches are discussed from synthetic and mechanistic point of views highlighting some important stereochemical issues.
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Affiliation(s)
- Wilfried Raimondi
- Aix-Marseille Université, UMR CNRS 7313 iSm2, Centre Saint Jérôme, service 531, 13397 Marseille, France
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12
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Boyce GR, Greszler SN, Johnson JS, Linghu X, Malinowski JT, Nicewicz DA, Satterfield AD, Schmitt DC, Steward KM. Silyl glyoxylates. Conception and realization of flexible conjunctive reagents for multicomponent coupling. J Org Chem 2012; 77:4503-15. [PMID: 22414181 PMCID: PMC3356452 DOI: 10.1021/jo300184h] [Citation(s) in RCA: 51] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
This Perspective describes the discovery and development of silyl glyoxylates, a new family of conjunctive reagents for use in multicomponent coupling reactions. The selection of the nucleophilic and electrophilic components determines whether the silyl glyoxylate reagent will function as a synthetic equivalent to the dipolar glycolic acid synthon, the glyoxylate anion synthon, or the α-keto ester homoenolate synthon. The ability to select for any of these reaction modes has translated to excellent structural diversity in the derived three- and four-component coupling adducts. Preliminary findings on the development of catalytic reactions using these reagents are detailed, as are the design and discovery of new reactions directed toward particular functional group arrays embedded within bioactive natural products.
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Affiliation(s)
- Gregory R. Boyce
- Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599-3290
| | - Stephen N. Greszler
- Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599-3290
| | - Jeffrey S. Johnson
- Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599-3290
| | - Xin Linghu
- Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599-3290
| | - Justin T. Malinowski
- Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599-3290
| | - David A. Nicewicz
- Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599-3290
| | - Andrew D. Satterfield
- Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599-3290
| | - Daniel C. Schmitt
- Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599-3290
| | - Kimberly M. Steward
- Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599-3290
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13
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Steward KM, Gentry EC, Johnson JS. Dynamic kinetic resolution of α-keto esters via asymmetric transfer hydrogenation. J Am Chem Soc 2012; 134:7329-32. [PMID: 22509806 DOI: 10.1021/ja3027136] [Citation(s) in RCA: 103] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The dynamic kinetic resolution of β-aryl α-keto esters has been accomplished using a newly designed (arene)RuCl(monosulfonamide) transfer hydrogenation catalyst. This dynamic process generates three contiguous stereocenters with remarkable diastereoselectivity through a reduction/lactonization sequence. The resulting enantioenriched, densely functionalized γ-butyrolactones are of high synthetic utility, as highlighted by several secondary derivatizations.
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Affiliation(s)
- Kimberly M Steward
- Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 2799-3290, USA
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14
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Gao G, Bai XF, Li F, Zheng LS, Zheng ZJ, Lai GQ, Jiang K, Li F, Xu LW. A Lewis acid-promoted reduction of acylsilanes to α-hydroxysilanes by diethylzinc. Tetrahedron Lett 2012. [DOI: 10.1016/j.tetlet.2012.02.059] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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15
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Schmitt DC, Malow EJ, Johnson JS. Three-component glycolate Michael reactions of enolates, silyl glyoxylates, and α,β-enones. J Org Chem 2012; 77:3246-51. [PMID: 22394389 DOI: 10.1021/jo202679u] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Silyl glyoxylates react with enolates and enones to afford either glycolate aldol or Michael adducts. Product identity is controlled by the countercation associated with the enolate. Reformatsky nucleophiles in the presence of additional Zn(OTf)(2) result in aldol coupling (A), while lithium enolates provide the Michael coupling (B). Deprotonation of the aldol product A with LDA induces equilibration to form the minor diastereomer of Michael product B. This observation suggests that formation of the major diastereomer of Michael product B does not occur via an aldol/retro-aldol/Michael sequence.
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Affiliation(s)
- Daniel C Schmitt
- Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599-3290, USA
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Trost BM, Malhotra S, Koschker P, Ellerbrock P. Development of the enantioselective addition of ethyl diazoacetate to aldehydes: asymmetric synthesis of 1,2-diols. J Am Chem Soc 2012; 134:2075-84. [PMID: 22088096 DOI: 10.1021/ja206995s] [Citation(s) in RCA: 59] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A novel synthetic strategy toward the asymmetric synthesis of vicinal diols bearing a tertiary center is presented. The method encompasses the dinuclear Mg-catalyzed asymmetric addition of ethyl diazoacetate into several aldehydes, oxidation of the diazo functionality, and diastereoselective alkyl transfer of various organometallics into the resulting chiral β-hydroxy-α-ketoesters to afford a diverse range of 1,2-diols in high yield, diastereoselectivity, and chirality transfer.
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Affiliation(s)
- Barry M Trost
- Stanford University, Stanford, California 94305-5080, USA.
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17
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Steward KM, Johnson JS. Asymmetric synthesis of α-keto esters via Cu(II)-catalyzed aerobic deacylation of acetoacetate alkylation products: an unusually simple synthetic equivalent to the glyoxylate anion synthon. Org Lett 2011; 13:2426-9. [PMID: 21486076 PMCID: PMC3094151 DOI: 10.1021/ol200649u] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A simple and efficient method for the preparation of β-stereogenic α-keto esters is described using a copper(II)-catalyzed aerobic deacylation of substituted acetoacetate esters. The substrates for the title process arise from catalytic, enantioselective conjugate additions and alkylation reactions of acetoacetate esters. The mild conditions do not induce racemization of the incipient enolizable α-keto ester. The reaction is tolerant of esters, certain ketones, ketals, and nitro groups and utilizes inexpensive, readily available materials.
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Affiliation(s)
- Kimberly M. Steward
- Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599-3290
| | - Jeffrey S. Johnson
- Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599-3290
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18
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