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Noda H. Imbuing an Old Heterocycle with the Power of Modern Catalysis: An Isoxazolidin-5-one Story. Chem Pharm Bull (Tokyo) 2021; 69:1160-1169. [PMID: 34853282 DOI: 10.1248/cpb.c21-00750] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Isoxazolidin-5-ones have been regarded as β-amino acid surrogates owing to their labile N-O bond. While many efforts have been devoted to the catalytic enantioselective synthesis of the core of this heterocycle, its further transformation has been less explored, especially in the context of catalysis. This review summarizes the author's research on the development of catalytic reactions using isoxazolidin-5-ones as substrates. Asymmetric catalysis has proven effective for C-C bond formation at the carbonyl α-carbon. Catalytic asymmetric allylation and direct Mannich-type reactions have been developed. Further, the resulting products have been readily converted into the corresponding quaternary β2,2-amino acids. Moreover, isoxazolidin-5-ones have been identified as alkyl nitrene precursors in the presence of a suitable metal catalyst. The generated metallonitrene undergoes either the electrophilic amination of the aromatic ring or aliphatic C-H insertion, affording a series of cyclic β-amino acids. A remarkable difference in chemoselectivity between rhodium and copper alkyl nitrenes has also been demonstrated, highlighting the unique nature of the underexplored reactive intermediates. The various linear and cyclic β-amino acids obtained through the study are likely to find great utility in a broad range of chemical sciences.
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2
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Noda H, Shibasaki M. Recent Advances in the Catalytic Asymmetric Synthesis of β
2
‐ and β
2,2
‐Amino Acids. European J Org Chem 2019. [DOI: 10.1002/ejoc.201901596] [Citation(s) in RCA: 30] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Hidetoshi Noda
- Institute of Microbial Chemistry (BIKAKEN) 3–14–23 Kamiosaki, Shinagawa‐ku, Tokyo 141–0021 Tokyo Japan
| | - Masakatsu Shibasaki
- Institute of Microbial Chemistry (BIKAKEN) 3–14–23 Kamiosaki, Shinagawa‐ku, Tokyo 141–0021 Tokyo Japan
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3
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Espinosa M, Noda H, Shibasaki M. Synthesis of Unprotected Spirocyclic β-Prolines and β-Homoprolines by Rh-Catalyzed C-H Insertion. Org Lett 2019; 21:9296-9299. [PMID: 31580682 DOI: 10.1021/acs.orglett.9b03198] [Citation(s) in RCA: 29] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
A series of unprotected spirocyclic β-prolines and β-homoprolines are prepared by Rh-catalyzed C-H insertion. The key intermediate, a Rh nitrenoid, is generated by the N-O bond cleavage of a substituted isoxazolidin-5-one. The reaction proceeds on a gram scale with a catalyst loading of as little as 0.1 mol %, affording spirocyclic β-amino acids that are otherwise difficult to obtain. The building blocks prepared in this work will likely find applications in medicinal chemistry.
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Affiliation(s)
- Miguel Espinosa
- Institute of Microbial Chemistry (BIKAKEN), Tokyo , 3-14-23 Kamiosaki , Shinagawa-ku , Tokyo 141-0021 , Japan
| | - Hidetoshi Noda
- Institute of Microbial Chemistry (BIKAKEN), Tokyo , 3-14-23 Kamiosaki , Shinagawa-ku , Tokyo 141-0021 , Japan
| | - Masakatsu Shibasaki
- Institute of Microbial Chemistry (BIKAKEN), Tokyo , 3-14-23 Kamiosaki , Shinagawa-ku , Tokyo 141-0021 , Japan
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4
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Amemiya F, Noda H, Shibasaki M. Lewis Base Assisted Lithium Brønsted Base Catalysis: A New Entry for Catalytic Asymmetric Synthesis of β 2,2-Amino Acids. Chem Pharm Bull (Tokyo) 2019; 67:1046-1049. [PMID: 31341115 DOI: 10.1248/cpb.c19-00569] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
A new catalytic system comprising chiral Ag complex and Li aryloxide/bisphosphine oxide is developed for the synthesis of β2,2-amino acids via direct asymmetric Mannich-type reaction of 4-subsituted isoxazolidin-5-ones. The Mannich adduct is a direct precursor of β-peptidic compounds otherwise difficult to obtain.
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5
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Yu JS, Espinosa M, Noda H, Shibasaki M. Traceless Electrophilic Amination for the Synthesis of Unprotected Cyclic β-Amino Acids. J Am Chem Soc 2019; 141:10530-10537. [PMID: 31188574 DOI: 10.1021/jacs.9b05476] [Citation(s) in RCA: 39] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
Electrophilic aminations involve an umpolung of a nitrogen atom, providing an alternate, distinctive synthetic strategy. The recent advent of various designed O-substituted hydroxylamines has significantly advanced this research field. An underappreciated issue is atom economy of the transformations: The necessary activating group on the oxygen atom is left in coproduced waste. Herein, we describe Rh-catalyzed electrophilic amination of substituted isoxazolidin-5-ones for the synthesis of unprotected, cyclic β-amino acids featuring either benzo-fused or spirocyclic scaffolds. Using the cyclic hydroxylamines allows for retaining both nitrogen and oxygen functionalities in the product. The traceless, redox neutral process proceeds on a gram scale with as little as 0.1 mol % catalyst loading. In contrast to related electrophilic aminations in the literature, a series of mechanistic experiments suggests a unique pathway involving spirocyclization, followed by the skeletal rearrangement. The insights provided herein shed light on a nuanced reactivity of the active species, Rh-nitrenoid generated from the activated hydroxylamine, and extend the knowledge on electrophilic aromatic substitutions.
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Affiliation(s)
- Jin-Sheng Yu
- Institute of Microbial Chemistry (BIKAKEN), Tokyo , 3-14-23 Kamiosaki , Shinagawa-ku , Tokyo 141-0021 , Japan
| | - Miguel Espinosa
- Institute of Microbial Chemistry (BIKAKEN), Tokyo , 3-14-23 Kamiosaki , Shinagawa-ku , Tokyo 141-0021 , Japan
| | - Hidetoshi Noda
- Institute of Microbial Chemistry (BIKAKEN), Tokyo , 3-14-23 Kamiosaki , Shinagawa-ku , Tokyo 141-0021 , Japan
| | - Masakatsu Shibasaki
- Institute of Microbial Chemistry (BIKAKEN), Tokyo , 3-14-23 Kamiosaki , Shinagawa-ku , Tokyo 141-0021 , Japan
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6
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Yu JS, Noda H, Shibasaki M. Exploiting β-Amino Acid Enolates in Direct Catalytic Diastereo- and Enantioselective C−C Bond-Forming Reactions. Chemistry 2018; 24:15796-15800. [DOI: 10.1002/chem.201804346] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2018] [Indexed: 11/10/2022]
Affiliation(s)
- Jin-Sheng Yu
- Institute of Microbial Chemistry (BIKAKEN), Tokyo; 3-14-23 Kamiosaki Shinagawa-ku Tokyo 141-0021 Japan
| | - Hidetoshi Noda
- Institute of Microbial Chemistry (BIKAKEN), Tokyo; 3-14-23 Kamiosaki Shinagawa-ku Tokyo 141-0021 Japan
| | - Masakatsu Shibasaki
- Institute of Microbial Chemistry (BIKAKEN), Tokyo; 3-14-23 Kamiosaki Shinagawa-ku Tokyo 141-0021 Japan
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7
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Yu J, Noda H, Shibasaki M. Quaternary β
2,2
‐Amino Acids: Catalytic Asymmetric Synthesis and Incorporation into Peptides by Fmoc‐Based Solid‐Phase Peptide Synthesis. Angew Chem Int Ed Engl 2017; 57:818-822. [DOI: 10.1002/anie.201711143] [Citation(s) in RCA: 47] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2017] [Indexed: 11/09/2022]
Affiliation(s)
- Jin‐Sheng Yu
- Institute of Microbial Chemistry (BIKAKEN), Tokyo 3-14-23 Kamiosaki, Shinagawa-ku Tokyo 141-0021 Japan
| | - Hidetoshi Noda
- Institute of Microbial Chemistry (BIKAKEN), Tokyo 3-14-23 Kamiosaki, Shinagawa-ku Tokyo 141-0021 Japan
| | - Masakatsu Shibasaki
- Institute of Microbial Chemistry (BIKAKEN), Tokyo 3-14-23 Kamiosaki, Shinagawa-ku Tokyo 141-0021 Japan
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8
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Yu J, Noda H, Shibasaki M. Quaternary β
2,2
‐Amino Acids: Catalytic Asymmetric Synthesis and Incorporation into Peptides by Fmoc‐Based Solid‐Phase Peptide Synthesis. Angew Chem Int Ed Engl 2017. [DOI: 10.1002/ange.201711143] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Jin‐Sheng Yu
- Institute of Microbial Chemistry (BIKAKEN), Tokyo 3-14-23 Kamiosaki, Shinagawa-ku Tokyo 141-0021 Japan
| | - Hidetoshi Noda
- Institute of Microbial Chemistry (BIKAKEN), Tokyo 3-14-23 Kamiosaki, Shinagawa-ku Tokyo 141-0021 Japan
| | - Masakatsu Shibasaki
- Institute of Microbial Chemistry (BIKAKEN), Tokyo 3-14-23 Kamiosaki, Shinagawa-ku Tokyo 141-0021 Japan
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9
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Le Foll Devaux A, Deau E, Corrot E, Bischoff L, Levacher V, Brière JF. A Meldrum's Acid Based Multicomponent Synthesis of N
-Fmoc-isoxazolidin-5-ones: Entry to N
-Fmoc-β-amino Acids. European J Org Chem 2017. [DOI: 10.1002/ejoc.201700472] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Alexandra Le Foll Devaux
- Normandie Université; INSA Rouen, Université de Rouen; CNRS; COBRA (UMR 6014); 76000 Rouen France
| | - Emmanuel Deau
- Normandie Université; INSA Rouen, Université de Rouen; CNRS; COBRA (UMR 6014); 76000 Rouen France
| | - Emilie Corrot
- Normandie Université; INSA Rouen, Université de Rouen; CNRS; COBRA (UMR 6014); 76000 Rouen France
| | - Laurent Bischoff
- Normandie Université; INSA Rouen, Université de Rouen; CNRS; COBRA (UMR 6014); 76000 Rouen France
| | - Vincent Levacher
- Normandie Université; INSA Rouen, Université de Rouen; CNRS; COBRA (UMR 6014); 76000 Rouen France
| | - Jean-François Brière
- Normandie Université; INSA Rouen, Université de Rouen; CNRS; COBRA (UMR 6014); 76000 Rouen France
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10
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Border EC, Maguire M, MacLellan JG, Andrews PC. Metal-Induced C–N Bond Cleavage in the Decomposition of Alkali (R,R)-Bis(α-methylbenzyl)amide Complexes. Organometallics 2017. [DOI: 10.1021/acs.organomet.7b00074] [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)
- Emily C. Border
- School of Chemistry, Monash University, Clayton, Melbourne, Victoria 3800, Australia
| | - Melissa Maguire
- School of Chemistry, Monash University, Clayton, Melbourne, Victoria 3800, Australia
| | - Jonathan G. MacLellan
- School of Chemistry, Monash University, Clayton, Melbourne, Victoria 3800, Australia
| | - Philip C. Andrews
- School of Chemistry, Monash University, Clayton, Melbourne, Victoria 3800, Australia
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11
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Cadart T, Berthonneau C, Levacher V, Perrio S, Brière JF. Enantioselective Phase-Transfer Catalyzed α-Sulfanylation of Isoxazolidin-5-ones: An Entry to β2,2-Amino Acid Derivatives. Chemistry 2016; 22:15261-15264. [DOI: 10.1002/chem.201603910] [Citation(s) in RCA: 35] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2016] [Indexed: 12/18/2022]
Affiliation(s)
- Timothée Cadart
- Normandie Univ; INSA Rouen; UNIROUEN, CNRS, COBRA (UMR 6014); 76000 Rouen France
| | - Clément Berthonneau
- Normandie Univ; INSA Rouen; UNIROUEN, CNRS, COBRA (UMR 6014); 76000 Rouen France
| | - Vincent Levacher
- Normandie Univ; INSA Rouen; UNIROUEN, CNRS, COBRA (UMR 6014); 76000 Rouen France
| | - Stéphane Perrio
- Normandie Univ; ENSICAEN; UNICAEN, CNRS, LCMT; 14000 Caen France
| | - Jean-François Brière
- Normandie Univ; INSA Rouen; UNIROUEN, CNRS, COBRA (UMR 6014); 76000 Rouen France
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12
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13
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Berini C, Sebban M, Oulyadi H, Sanselme M, Levacher V, Brière JF. Organocatalyzed Multicomponent Synthesis of Isoxazolidin-5-ones. Org Lett 2015; 17:5408-11. [DOI: 10.1021/acs.orglett.5b02755] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Affiliation(s)
- Christophe Berini
- Normandie Univ, COBRA, UMR 6014 et FR 3038; Univ Rouen; INSA Rouen; CNRS, IRCOF, 1 rue Tesnière, 76821 Mont Saint Aignan Cedex, France
| | - Muriel Sebban
- Normandie Univ, COBRA, UMR 6014 et FR 3038; Univ Rouen; INSA Rouen; CNRS, IRCOF, 1 rue Tesnière, 76821 Mont Saint Aignan Cedex, France
| | - Hassan Oulyadi
- Normandie Univ, COBRA, UMR 6014 et FR 3038; Univ Rouen; INSA Rouen; CNRS, IRCOF, 1 rue Tesnière, 76821 Mont Saint Aignan Cedex, France
| | - Morgane Sanselme
- Normandie Univ, Laboratoire SMS- EA3233, Univ Rouen, F-76821, Mont Saint Aignan, France
| | - Vincent Levacher
- Normandie Univ, COBRA, UMR 6014 et FR 3038; Univ Rouen; INSA Rouen; CNRS, IRCOF, 1 rue Tesnière, 76821 Mont Saint Aignan Cedex, France
| | - Jean-François Brière
- Normandie Univ, COBRA, UMR 6014 et FR 3038; Univ Rouen; INSA Rouen; CNRS, IRCOF, 1 rue Tesnière, 76821 Mont Saint Aignan Cedex, France
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14
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Marson CM, Yau KC. Regioselective synthesis of substituted piperidine-2,4-diones and their derivatives via Dieckmann cyclisations. Tetrahedron 2015. [DOI: 10.1016/j.tet.2015.06.052] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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15
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Kiss L, Cherepanova M, Fülöp F. Recent advances in the stereoselective syntheses of acyclic disubstituted β2,3-amino acids. Tetrahedron 2015. [DOI: 10.1016/j.tet.2015.01.060] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
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16
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Romanens A, Bélanger G. Preparation of conformationally restricted β(2,2)- and β(2,2,3)-amino esters and derivatives containing an all-carbon quaternary center. Org Lett 2015; 17:322-5. [PMID: 25551418 DOI: 10.1021/ol503432b] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
β-Amino acids are routinely incorporated into peptidic drugs to increase their stability and to incur conformational biases. However, the synthesis of highly substituted β-amino acids still represents a great challenge. A new approach to their preparation is reported involving a Vilsmeier-Haack reaction with nonaromatic carbon nucleophiles. The highly challenging preparation of contiguous tertiary and all-carbon quaternary centers was successfully used to generate several β(2,2,3)-amino esters, such as derivatives of homoproline, homoalanine, and homopipecolinic esters.
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Affiliation(s)
- Alexandre Romanens
- Département de Chimie, Université de Sherbrooke , 2500 boulevard de l'Université, Sherbrooke, Québec J1K 2R1, Canada
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17
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Davies SG, Fletcher AM, Frost AB, Roberts PM, Thomson JE. Trading N and O. Part 2: Exploiting aziridinium intermediates for the synthesis of β-hydroxy-α-amino acids. Tetrahedron 2014. [DOI: 10.1016/j.tet.2014.06.057] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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18
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Nieto CT, Díez D, Garrido NM. To be or not to be butterfly: New mechanistic insights in the Aza-Michael asymmetric addition of lithium (R)-N-benzyl-N-(α-methylbenzyl)amide. J Comput Chem 2014; 35:1846-53. [PMID: 25052741 DOI: 10.1002/jcc.23694] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2014] [Revised: 07/07/2014] [Accepted: 07/09/2014] [Indexed: 11/08/2022]
Abstract
The asymmetric Aza-Michael addition of homochiral lithium benzylamides to α,β-unsaturated esters represents an extended protocol to obtain enantioenriched β-amino esters. An exhaustive mechanistic revision of the originally proposed mechanism is reported, developing a quantum mechanics/molecular mechanics protocol for the asymmetric Aza-Michael reaction of homochiral lithium benzylamides. Explicit and implicit solvent schemes were considered, together with a proper account of long-range dispersion forces, evaluated through a density functional theory benchmark of different functionals. Theoretical results showed that the diastereoselectivity is mainly controlled by the N-α-methylbenzyl moiety placing, deriving a Si/Re 99:1 diastereoselective ratio, in good agreement with reported experimental results. The main transition state geometries are two transition state conformers in a "V-stacked" orientation of the amide's phenyl rings, differing in the tetrahydrofuran molecule arrangement coordinated to the metal center. Extensive conformational sampling and quantum-level refinement give reasonable good speed/accuracy results, allowing this protocol to be extended to other similar Aza-Michael reaction systems.
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Affiliation(s)
- Carlos T Nieto
- Departamento de Química Orgánica, Universidad de Salamanca, Pza de la Merced 1-5, 37007, Salamanca, Spain
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19
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Regioselective ring opening of β-phenylglycidate and aziridine-2-carboxylates with N-alkylhydroxylamines: synthesis of isoxazolidinones. Tetrahedron 2014. [DOI: 10.1016/j.tet.2013.12.052] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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20
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Davies SG, Fletcher AM, Lee JA, Roberts PM, Souleymanou MY, Thomson JE, Zammit CM. Diastereoselective Ireland–Claisen rearrangements of substituted allyl β-amino esters: applications in the asymmetric synthesis of C(5)-substituted transpentacins. Org Biomol Chem 2014; 12:2702-28. [DOI: 10.1039/c4ob00274a] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
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21
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Lee ASY, Chang YT, Su FY. Chemoselective Synthesis of β-Amino Ester or β-Lactam via Sonochemical Reformatsky Reaction. J CHIN CHEM SOC-TAIP 2013. [DOI: 10.1002/jccs.201300308] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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22
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Davies SG, Fletcher AM, Frost AB, Lee JA, Roberts PM, Thomson JE. Trading N and O: asymmetric syntheses of β-hydroxy-α-amino acids via α-hydroxy-β-amino esters. Tetrahedron 2013. [DOI: 10.1016/j.tet.2013.08.007] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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23
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Davies SG, Foster EM, Lee JA, Roberts PM, Thomson JE. Asymmetric syntheses of dihydroxyhomoprolines via doubly diastereoselective lithium amide conjugate addition reactions. Tetrahedron 2013. [DOI: 10.1016/j.tet.2013.07.096] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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24
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Postikova S, Tite T, Levacher V, Brière JF. Organocatalyzed Synthesis of Isoxazolidin-5-ones: The Meldrum’s Acid Approach. Adv Synth Catal 2013. [DOI: 10.1002/adsc.201300465] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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25
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Tickell DA, Mahon MF, Bull SD, James TD. A Simple Protocol for NMR Analysis of the Enantiomeric Purity of Chiral Hydroxylamines. Org Lett 2013; 15:860-3. [DOI: 10.1021/ol303566k] [Citation(s) in RCA: 46] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Affiliation(s)
- David A. Tickell
- Department of Chemistry, University of Bath, Claverton Down, Bath, BA27AY, U.K
| | - Mary F. Mahon
- Department of Chemistry, University of Bath, Claverton Down, Bath, BA27AY, U.K
| | - Steven D. Bull
- Department of Chemistry, University of Bath, Claverton Down, Bath, BA27AY, U.K
| | - Tony D. James
- Department of Chemistry, University of Bath, Claverton Down, Bath, BA27AY, U.K
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26
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Davies SG, Lee JA, Roberts PM, Stonehouse JP, Thomson JE. Absolute Configuration Assignment by Asymmetric Syntheses of the Homalium Alkaloids (−)-(R,R,R)-Hoprominol and (−)-(4′S,4″R,2‴R)-Hopromalinol. J Org Chem 2012; 77:9724-37. [DOI: 10.1021/jo301830j] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Stephen G. Davies
- Department
of Chemistry, Chemistry
Research Laboratory, University of Oxford, Mansfield Road, Oxford OX1 3TA, United Kingdom
| | - James A. Lee
- Department
of Chemistry, Chemistry
Research Laboratory, University of Oxford, Mansfield Road, Oxford OX1 3TA, United Kingdom
| | - Paul M. Roberts
- Department
of Chemistry, Chemistry
Research Laboratory, University of Oxford, Mansfield Road, Oxford OX1 3TA, United Kingdom
| | - Jeffrey P. Stonehouse
- Novartis Institutes for Biomedical Research, Horsham, West Sussex RH12 5AB,
United Kingdom
| | - James E. Thomson
- Department
of Chemistry, Chemistry
Research Laboratory, University of Oxford, Mansfield Road, Oxford OX1 3TA, United Kingdom
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27
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Nguyen NH, Sleebs BE, White JM, Hughes AB. Corrigendum to “Diastereoselective synthesis of highly functionalized β2,2,3-substituted amino acids from 4-substituted-1,3-oxazinan-6-ones” [Tetrahedron 68 (2012) 4745–4756]. Tetrahedron 2012. [DOI: 10.1016/j.tet.2012.07.041] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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28
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Davies SG, Lee JA, Roberts PM, Stonehouse JP, Thomson JE. Asymmetric Syntheses of the Homalium Alkaloids (−)-(S,S)-Homaline and (−)-(R,R)-Hopromine. J Org Chem 2012; 77:7028-45. [DOI: 10.1021/jo3012732] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Stephen G. Davies
- Department
of Chemistry, Chemistry
Research Laboratory, University of Oxford, Mansfield Road, Oxford OX1 3TA, U.K
| | - James A. Lee
- Department
of Chemistry, Chemistry
Research Laboratory, University of Oxford, Mansfield Road, Oxford OX1 3TA, U.K
| | - Paul M. Roberts
- Department
of Chemistry, Chemistry
Research Laboratory, University of Oxford, Mansfield Road, Oxford OX1 3TA, U.K
| | | | - James E. Thomson
- Department
of Chemistry, Chemistry
Research Laboratory, University of Oxford, Mansfield Road, Oxford OX1 3TA, U.K
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29
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Zhang H, Zhang SJ, Zhou QQ, Dong L, Chen YC. Organocatalytic asymmetric allylic amination of Morita-Baylis-Hillman carbonates of isatins. Beilstein J Org Chem 2012; 8:1241-5. [PMID: 23019454 PMCID: PMC3458744 DOI: 10.3762/bjoc.8.139] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2012] [Accepted: 07/09/2012] [Indexed: 11/23/2022] Open
Abstract
The investigation of a Lewis base catalyzed asymmetric allylic amination of Morita–Baylis–Hillman carbonates derived from isatins afforded an electrophilic pathway to access multifunctional oxindoles bearing a C3-quaternary stereocenter, provided with good to excellent enantioselectivity (up to 94% ee) and in high yields (up to 97%).
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Affiliation(s)
- Hang Zhang
- Key Laboratory of Drug-Targeting and Drug Delivery System of the Education Ministry, Department of Medicinal Chemistry, West China School of Pharmacy, Sichuan University, Chengdu 610041, China
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30
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The conjugate addition of enantiomerically pure lithium amides as chiral ammonia equivalents part II: 2005−2011. ACTA ACUST UNITED AC 2012. [DOI: 10.1016/j.tetasy.2012.08.009] [Citation(s) in RCA: 105] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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Davies SG, Fletcher AM, Lv L, Roberts PM, Thomson JE. Asymmetric synthesis of (−)-(R)-sitagliptin. Tetrahedron Lett 2012. [DOI: 10.1016/j.tetlet.2012.04.025] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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Davies SG, Huckvale R, Lee JA, Lorkin TJ, Roberts PM, Thomson JE. Asymmetric syntheses of 3,4-syn- and 3,4-anti-3-substituted-4-aminopiperidin-2-ones: application to the asymmetric synthesis of (+)-(3S,4R)-cisapride. Tetrahedron 2012. [DOI: 10.1016/j.tet.2011.12.084] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/14/2022]
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Davies SG, Fletcher AM, Hughes DG, Lee JA, Price PD, Roberts PM, Russell AJ, Smith AD, Thomson JE, Williams OM. Asymmetric synthesis of piperidines and octahydroindolizines using a one-pot ring-closure/N-debenzylation procedure. Tetrahedron 2011. [DOI: 10.1016/j.tet.2011.09.038] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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Double asymmetric induction as a mechanistic probe: the doubly diastereoselective conjugate addition of enantiopure lithium amides to enantiopure α,β-unsaturated esters and enantiopure α,β-unsaturated hydroxamates. Tetrahedron 2011. [DOI: 10.1016/j.tet.2011.05.102] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Davies SG, Foster EM, McIntosh CR, Roberts PM, Rosser TE, Smith AD, Thomson JE. Asymmetric synthesis of syn- and anti-α-deuterio-β3-phenylalanine derivatives. ACTA ACUST UNITED AC 2011. [DOI: 10.1016/j.tetasy.2011.06.008] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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Bentley SA, Davies SG, Lee JA, Roberts PM, Thomson JE. Conjugate Addition of Lithium N-Phenyl-N-(α-methylbenzyl)amide: Application to the Asymmetric Synthesis of (R)-(−)-Angustureine. Org Lett 2011; 13:2544-7. [DOI: 10.1021/ol200625h] [Citation(s) in RCA: 50] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Scott A. Bentley
- Department of Chemistry, Chemistry Research Laboratory, University of Oxford, Mansfield Road, Oxford OX1 3TA, U.K
| | - Stephen G. Davies
- Department of Chemistry, Chemistry Research Laboratory, University of Oxford, Mansfield Road, Oxford OX1 3TA, U.K
| | - James A. Lee
- Department of Chemistry, Chemistry Research Laboratory, University of Oxford, Mansfield Road, Oxford OX1 3TA, U.K
| | - Paul M. Roberts
- Department of Chemistry, Chemistry Research Laboratory, University of Oxford, Mansfield Road, Oxford OX1 3TA, U.K
| | - James E. Thomson
- Department of Chemistry, Chemistry Research Laboratory, University of Oxford, Mansfield Road, Oxford OX1 3TA, U.K
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Davies SG, Ichihara O, Roberts PM, Thomson JE. Asymmetric syntheses of (+)-negamycin, (+)-3-epi-negamycin and sperabillin C via lithium amide conjugate addition. Tetrahedron 2011. [DOI: 10.1016/j.tet.2010.10.067] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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