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Chaumont-Olive P, Sánchez-Quesada J, Collado Pérez AM, Cossy J. Synthetic approaches to the damascone and damascenone isomers. Tetrahedron 2021. [DOI: 10.1016/j.tet.2021.131932] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
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2
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Annand JR, Riehl PS, Schultz DM, Schindler CS. High-Throughput Approach toward the Development of a Mizoroki-Heck Reaction To Access Tricyclic Spirolactones. J Org Chem 2020; 85:9071-9079. [PMID: 32539398 DOI: 10.1021/acs.joc.0c00997] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The ent-kaurenes represent a class of naturally occurring diterpenes of biological importance. Several members of the ent-kaurenes contain a common, tricyclic spirolactone core as a key structural motif. This study details a concise approach toward the development of a Mizoroki-Heck reaction to access this spirolactone core. The strategy described herein was enabled in microscale high-throughput experiments to allow for the rapid identification and optimization of superior reaction conditions.
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Affiliation(s)
- James R Annand
- Department of Chemistry, Willard Henry Dow Laboratory, University of Michigan, 930 North University Avenue, Ann Arbor, Michigan 48109, United States
| | - Paul S Riehl
- Department of Chemistry, Willard Henry Dow Laboratory, University of Michigan, 930 North University Avenue, Ann Arbor, Michigan 48109, United States
| | - Danielle M Schultz
- Process Research and Development, Merck & Co., Inc., Rahway, New Jersey 07065, United States
| | - Corinna S Schindler
- Department of Chemistry, Willard Henry Dow Laboratory, University of Michigan, 930 North University Avenue, Ann Arbor, Michigan 48109, United States
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3
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Homberg A, Hrdina R, Vishe M, Guénée L, Lacour J. Stereoselective deconjugation of macrocyclic α,β-unsaturated esters by sequential amidation and olefin transposition: application to enantioselective phase-transfer catalysis. Org Biomol Chem 2019; 17:6905-6910. [PMID: 31270519 DOI: 10.1039/c9ob01355e] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
The stereoselective synthesis of chiral macrocycles bearing two aliphatic amide functional groups is reported. After the amidation mediated by TBD, a guanidine derivative, the olefin transposition step is performed with a slight excess of t-BuOK. The products are afforded in moderate to good combined yields (up to 59%) and with an excellent syn diastereoselectivity (dr > 49 : 1). Introducing enantiopure α-branched substituents was possible and it resulted in mixtures of diastereomers, which could be tested as phase-transfer catalysts using the formation of a phenylalanine analog as a test reaction (up to 43% ee). A clear matched-mismatched situation was observed in the two diastereomeric series.
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Affiliation(s)
- Alexandre Homberg
- Department of Organic Chemistry, University of Geneva, Quai Ernest Ansermet 30, 1211 Geneva 4, Switzerland.
| | - Radim Hrdina
- Department of Organic Chemistry, University of Geneva, Quai Ernest Ansermet 30, 1211 Geneva 4, Switzerland.
| | - Mahesh Vishe
- Department of Organic Chemistry, University of Geneva, Quai Ernest Ansermet 30, 1211 Geneva 4, Switzerland.
| | - Laure Guénée
- Laboratory of Crystallography, University of Geneva, Quai Ernest Ansermet 24, 1211 Geneva 4, Switzerland
| | - Jérôme Lacour
- Department of Organic Chemistry, University of Geneva, Quai Ernest Ansermet 30, 1211 Geneva 4, Switzerland.
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4
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Johnson DA, Mueller Hendrix AJ, Jennings MP. Diastereoselective Syntheses of (E)-α-Trialkylsilyl α,β-Unsaturated Esters, α-Silane-Substituted Conjugated Silyl Ketene Acetals, and α,γ-Substituted Allylsilanes. J Org Chem 2018; 83:9914-9928. [DOI: 10.1021/acs.joc.8b01209] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- David A. Johnson
- Department of Chemistry, The University of Alabama, 250 Hackberry
Lane, Tuscaloosa, Alabama 35487-0336, United States
| | - Amanda J. Mueller Hendrix
- Department of Chemistry, The University of Alabama, 250 Hackberry
Lane, Tuscaloosa, Alabama 35487-0336, United States
| | - Michael P. Jennings
- Department of Chemistry, The University of Alabama, 250 Hackberry
Lane, Tuscaloosa, Alabama 35487-0336, United States
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5
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Dai J, Wang M, Chai G, Fu C, Ma S. A Practical Solution to Stereodefined Tetrasubstituted Olefins. J Am Chem Soc 2016; 138:2532-5. [DOI: 10.1021/jacs.6b00051] [Citation(s) in RCA: 35] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Affiliation(s)
- Jianxin Dai
- Laboratory of Molecular Recognition
and Synthesis, Department of Chemistry, Zhejiang University, Hangzhou 310027, Zhejiang, People’s Republic of China
| | - Minyan Wang
- Laboratory of Molecular Recognition
and Synthesis, Department of Chemistry, Zhejiang University, Hangzhou 310027, Zhejiang, People’s Republic of China
| | - Guobi Chai
- Laboratory of Molecular Recognition
and Synthesis, Department of Chemistry, Zhejiang University, Hangzhou 310027, Zhejiang, People’s Republic of China
| | - Chunling Fu
- Laboratory of Molecular Recognition
and Synthesis, Department of Chemistry, Zhejiang University, Hangzhou 310027, Zhejiang, People’s Republic of China
| | - Shengming Ma
- Laboratory of Molecular Recognition
and Synthesis, Department of Chemistry, Zhejiang University, Hangzhou 310027, Zhejiang, People’s Republic of China
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6
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Vishe M, Hrdina R, Poblador-Bahamonde AI, Besnard C, Guénée L, Bürgi T, Lacour J. Remote stereoselective deconjugation of α,β-unsaturated esters by simple amidation reactions. Chem Sci 2015; 6:4923-4928. [PMID: 29142723 PMCID: PMC5664367 DOI: 10.1039/c5sc01118c] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2015] [Accepted: 05/21/2015] [Indexed: 12/15/2022] Open
Abstract
The thermodynamically disfavored isomerization of α,β-unsaturated esters to deconjugated β,γ-unsaturated analogues occurs readily when coupled to an amidation. Within the framework of macrocyclic derivatives, it is shown that 15, 16, and 18 membered macrocycles react with tBuOK and anilines to generate, in one-pot, β,γ-unsaturated amides (yields up to 88%). Importantly, single (chiral) diastereomers are isolated (d.r. > 49 : 1, 1H NMR) irrespective of the size and nature of the rings, showing an effective transmission of remote stereochemistry during the isomerization process. CSP-chromatographic resolution and absolute configuration determination by VCD are achieved.
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Affiliation(s)
- Mahesh Vishe
- Department of Organic Chemistry , University of Geneva , Quai Ernest Ansermet 30 , CH-1211 Geneva 4 , Switzerland . ; http://www.unige.ch/sciences/chiorg/lacour/
| | - Radim Hrdina
- Department of Organic Chemistry , University of Geneva , Quai Ernest Ansermet 30 , CH-1211 Geneva 4 , Switzerland . ; http://www.unige.ch/sciences/chiorg/lacour/
| | - Amalia I Poblador-Bahamonde
- Department of Organic Chemistry , University of Geneva , Quai Ernest Ansermet 30 , CH-1211 Geneva 4 , Switzerland . ; http://www.unige.ch/sciences/chiorg/lacour/
| | - Céline Besnard
- Laboratory of Crystallography , University of Geneva , Quai Ernest Ansermet 24 , CH-1211 Geneva 4 , Switzerland
| | - Laure Guénée
- Laboratory of Crystallography , University of Geneva , Quai Ernest Ansermet 24 , CH-1211 Geneva 4 , Switzerland
| | - Thomas Bürgi
- Department of Physical Chemistry , University of Geneva , Quai Ernest Ansermet 30 , CH-1211 Geneva 4 , Switzerland
| | - Jérôme Lacour
- Department of Organic Chemistry , University of Geneva , Quai Ernest Ansermet 30 , CH-1211 Geneva 4 , Switzerland . ; http://www.unige.ch/sciences/chiorg/lacour/
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7
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Bruneau A, Liou L, Collum DB. Solution structures of lithium amino alkoxides used in highly enantioselective 1,2-additions. J Am Chem Soc 2014; 136:2885-91. [PMID: 24471766 PMCID: PMC3985715 DOI: 10.1021/ja412210d] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2013] [Indexed: 01/25/2023]
Abstract
Lithium ephedrates and norcarane-derived lithium amino alkoxides used to effect highly enantioselective 1,2-additions on large scales have been characterized in toluene and tetrahydrofuran. The method of continuous variations in conjunction with (6)Li NMR spectroscopy reveals that the lithium amino alkoxides are tetrameric. In each case, low-temperature (6)Li NMR spectra show stereoisomerically pure homoaggregates displaying resonances consistent with an S4-symmetric cubic core rather than the alternative D2d core. These assignments are supported by density functional theory computations and conform to X-ray crystal structures. Slow aggregate exchanges are discussed in the context of amino alkoxides as chiral auxiliaries.
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Affiliation(s)
- Angela
M. Bruneau
- Department of Chemistry and
Chemical Biology Baker Laboratory, Cornell
University, Ithaca, New York 14853-1301, United States
| | - Lara Liou
- Department of Chemistry and
Chemical Biology Baker Laboratory, Cornell
University, Ithaca, New York 14853-1301, United States
| | - David B. Collum
- Department of Chemistry and
Chemical Biology Baker Laboratory, Cornell
University, Ithaca, New York 14853-1301, United States
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8
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Fu N, Zhang L, Li J, Luo S, Cheng JP. Chiral primary amine catalyzed enantioselective protonation via an enamine intermediate. Angew Chem Int Ed Engl 2011; 50:11451-5. [PMID: 21987522 DOI: 10.1002/anie.201105477] [Citation(s) in RCA: 70] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2011] [Revised: 08/22/2011] [Indexed: 11/09/2022]
Affiliation(s)
- Niankai Fu
- Beijing National Laboratory for Molecular Sciences (BNLMS), CAS Key of Molecular Recognition and Function, Institute of Chemistry, Chinese Academy of Sciences, Beijing, China
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9
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Fu N, Zhang L, Li J, Luo S, Cheng JP. Chiral Primary Amine Catalyzed Enantioselective Protonation via an Enamine Intermediate. Angew Chem Int Ed Engl 2011. [DOI: 10.1002/ange.201105477] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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10
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Mohrig JR, Reiter NJ, Kirk R, Zawadski MR, Lamarre-Vincent N. Effect of Buffer General Acid−Base Catalysis on the Stereoselectivity of Ester and Thioester H/D Exchange in D2O. J Am Chem Soc 2011; 133:5124-8. [DOI: 10.1021/ja200014c] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Jerry R. Mohrig
- Department of Chemistry, Carleton College, Northfield, Minnesota 55057, United States
| | - Nicholas J. Reiter
- Department of Chemistry, Carleton College, Northfield, Minnesota 55057, United States
| | - Randy Kirk
- Department of Chemistry, Carleton College, Northfield, Minnesota 55057, United States
| | - Michelle R. Zawadski
- Department of Chemistry, Carleton College, Northfield, Minnesota 55057, United States
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11
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Poisson T, Gembus V, Dalla V, Oudeyer S, Levacher V. Organocatalyzed enantioselective protonation of silyl enol ethers: scope, limitations, and application to the preparation of enantioenriched homoisoflavones. J Org Chem 2010; 75:7704-16. [PMID: 20958068 DOI: 10.1021/jo101585t] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
In the present work, enantioselective protonation of silyl enol ethers is reported by means of a variety of chiral nitrogen bases as catalysts, mainly derived from cinchona alkaloids, in the presence of various protic nucleophiles as proton source. A detailed study of the most relevant reaction parameters is disclosed allowing high enantioselectivities of up to 92% ee with excellent yields to be achieved under mild and eco-friendly conditions. The synthetic utility of this organocatalytic protonation was demonstrated during the preparation of two homoisoflavones 4a and 4b, isolated from Chlorophytum Inornatum and Scilla Nervosa, which were obtained with 81% and 78% ee, respectively.
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Affiliation(s)
- Thomas Poisson
- Laboratoire de Chimie Organique Bio-organique Réactivité et Analyse (COBRA), CNRS UMR 6014 & FR 3038, Université et INSA de Rouen, Rue Tesnière, Mont-Saint-Aignan 76130-F, France
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12
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Fehr C, Randall H. Synthetic Applications of Enantioselective Protonation and Case Study for (S)‐α‐Damascone. Chem Biodivers 2008; 5:942-57. [DOI: 10.1002/cbdv.200890106] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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13
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Luparia M, Boschetti P, Piccinini F, Porta A, Zanoni G, Vidari G. Enantioselective Synthesis and Olfactory Evaluation of 13‐Alkyl‐Substitutedα‐Ionones. Chem Biodivers 2008; 5:1045-57. [DOI: 10.1002/cbdv.200890084] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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14
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Silva PJ, Ramos MJ. Comparative density functional study of models for the reaction mechanism of uroporphyrinogen III synthase. J Phys Chem B 2008; 112:3144-8. [PMID: 18281969 DOI: 10.1021/jp076235f] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The asymmetric cyclic tetrapyrrole uroporphyrinogen III is the common precursor of heme, chlorophyll, siroheme, and other biological tetrapyrroles. In vivo, it is synthesized from a linear symmetric precursor (hydroxymethylbilane) by uroporphyrinogen III synthase, which catalyzes the inversion of one of the four heterocyclic rings present in the substrate. Two mechanisms have been proposed to explain this puzzling ring inversion, either through sigmatropic shifts or through the direct formation of a spirocyclic pyrrolenine intermediate. We performed the first high-level quantum mechanical calculations on model systems of this enzyme to analyze these contrasting reaction mechanisms. The results allow us to discard the sigmatropic shift mechanism and suggest that the D-ring of the hydroxymethylbilane substrate binds to the enzyme in a conformation that shields its terminal portion from reacting with ring A and prevents the formation of the biologically useless uroporphyrinogen I, whose accumulation (in individuals lacking functional uroporphyrinogen III synthase) leads to severe cutaneous dermatosis.
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Affiliation(s)
- Pedro J Silva
- Faculdade de Ciências da Saúde, Universidade Fernando Pessoa, Rua Carlos da Maia 296, Porto, Portugal
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15
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16
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Fehr C. Catalytic Enantioselective Tautomerization of Isolated Enols. Angew Chem Int Ed Engl 2007; 46:7119-21. [PMID: 17594700 DOI: 10.1002/anie.200701428] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Charles Fehr
- Firmenich SA, Corporate R&D Division, PO Box 239, 1211 Geneva 8, Switzerland.
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17
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Boulin B, Taran M, Arreguy‐San Miguel B, Delmond B. New Preparation Methods for α‐Damascone, γ‐Damascone, and β‐Damascenone using Pyronenes. SYNTHETIC COMMUN 2007. [DOI: 10.1080/00397910701462898] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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18
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Li A, Bie P, Peng X, Wu T, Pan X, Chan ASC, Yang TK. ENANTIOSELECTIVE TOTAL SYNTHESES OF 13-ACETYL- 12-HYDROXY-PODOCARPANE- 8,11,13-TRIENE-7-ONE. SYNTHETIC COMMUN 2006. [DOI: 10.1081/scc-120002407] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Affiliation(s)
- Anpai Li
- a Department of Chemistry , National Laboratory of Applied Organic Chemistry , Lanzhou University , Lanzhou Gansu, 730000, P. R. China
| | - Pingyan Bie
- a Department of Chemistry , National Laboratory of Applied Organic Chemistry , Lanzhou University , Lanzhou Gansu, 730000, P. R. China
| | - Xiaoshui Peng
- a Department of Chemistry , National Laboratory of Applied Organic Chemistry , Lanzhou University , Lanzhou Gansu, 730000, P. R. China
| | - Tongxing Wu
- a Department of Chemistry , National Laboratory of Applied Organic Chemistry , Lanzhou University , Lanzhou Gansu, 730000, P. R. China
| | - Xinfu Pan
- b Department of Chemistry , National Laboratory of Applied Organic Chemistry , Lanzhou University , Lanzhou Gansu, 730000, P. R. China
| | - Albert S. C. Chan
- c Union Laboratory of Asymmetry Synthesis and Department of Applied Biology and Chemical Technology , The Hong Kong Polytechnic University , Hong Kong
| | - Teng-Kuei Yang
- d Department of Chemistry , National Chung-Hsing University , Taichung, Taiwan
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19
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Duhamel L, Duhamel P, Plaquevent JC. Enantioselective protonations: fundamental insights and new concepts. ACTA ACUST UNITED AC 2004. [DOI: 10.1016/j.tetasy.2004.09.035] [Citation(s) in RCA: 184] [Impact Index Per Article: 9.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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20
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Kim BM, Kim H, Kim W, Im KY, Park JK. Asymmetric protonation of ketone enolates using chiral beta-hydroxyethers: acidity-tuned enantioselectivity. J Org Chem 2004; 69:5104-7. [PMID: 15255744 DOI: 10.1021/jo0498258] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
New chiral hydroxyethers 1a-f were prepared for asymmetric protonation of achiral enolates prepared from prochiral ketones. The enantioselectivity of protonation was highly dependent upon the acidity of the chiral alcohols, the highest enantioselectivity (90% ee) being achieved with 3,5-dichloro-substituted beta-hydroxyether 1c. A salt-free enolate generated from trimethylsilyl enol ether 4 provided product of the highest ee. Unlike other reagents, chloro-substituted alcohols provided almost consistent enantioselections throughout the reaction temperatures examined (-25 to -98 degrees C). Protonation of other aromatic ketones showed selectivity similar to that of 2-methyl-1-tetralone.
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Affiliation(s)
- B Moon Kim
- School of Chemistry, Seoul National University, Seoul 151-747, South Korea.
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21
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The thiopyran route to polypropionates. Asymmetric synthesis of the building blocks by enantioselective protonation. ACTA ACUST UNITED AC 2004. [DOI: 10.1016/j.tetasy.2004.06.027] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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22
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23
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Clericuzio M, Degani I, Dughera S, Fochi R. Deracemization of thiol esters of α-arylpropionic acids. ACTA ACUST UNITED AC 2003. [DOI: 10.1016/s0957-4166(02)00783-8] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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24
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Flinois K, Yuan Y, Bastide C, Harrison-Marchand A, Maddaluno J. Enantioselective protonation and alkylation of non-covalent mixed aggregates of chiral 3-aminopyrrolidine lithium amides. Tetrahedron 2002. [DOI: 10.1016/s0040-4020(02)00377-0] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Abstract
Two efficient enantioselective syntheses of the more active (S,S)-enantiomer of the powerful musk odorant Vulcanolide are described. In both syntheses, the key step is an enantioselective protonation of a ketone enolate. A third enantioselective protonation, of a thiol ester enolate, was applied for the determination of the absolute configuration of Vulcanolide by comparison with a known compound.
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Affiliation(s)
- Charles Fehr
- Firmenich SA, Corporate R&D Division P.O. Box 239, 1211 Geneva 8, Switzerland.
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Abstract
The last few years have witnessed a spectacular advancement in new catalytic methods based on metal-free organic molecules. In many cases, these small compounds give rise to extremely high enantioselectivities. Preparative advantages are notable: usually the reactions can be performed under an aerobic atmosphere with wet solvents. The catalysts are inexpensive and they are often more stable than enzymes or other bioorganic catalysts. Also, these small organic molecules can be anchored to a solid support and reused more conveniently than organometallic/bioorganic analogues, and show promising adaptability to high-throughput screening and process chemistry. Herein we focus on four different domains in which organocatalysis has made major advances: 1) The activation of the reaction based on the nucleophilic/electrophilic properties of the catalysts. This type of catalysis has much in common with conventional Lewis acid/base activation by metal complexes. 2) Transformations in which the organic catalyst forms a reactive intermediate: the chiral catalyst is consumed in the reaction and requires regeneration in a parallel catalytic cycle. 3) Phase-transfer reactions: The chiral catalyst forms a host-guest complex with the substrate and shuttles between the standard organic solvent and the second phase (i.e. a solid, aqueous, or fluorous phase in which the organic transformation takes place). 4) Molecular-cavity-accelerated asymmetric transformations: the catalyst can select between competing substrates, depending on size and structure criteria. The rate acceleration of a given reaction is similar to the Lewis acid/base activation and is the consequence of the simultaneous action of different polar functions. Herein it is shown that organocatalysis complements rather than competes with current methods. It offers something conceptually novel and opens new horizons in synthesis.
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Affiliation(s)
- Peter I. Dalko
- Laboratoire de Recherches Organiques associé au CNRS, ESCPI 10 rue Vauquelin, 75231 Paris Cedex 05 (France)
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29
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Yonghong G, Xinfu P. Stereoselective Synthesis of (+)-Ferruginyl Methyl Ether and (+)-Sugiyl Methyl Ether. JOURNAL OF CHEMICAL RESEARCH 2000. [DOI: 10.3184/030823400103166670] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
A facile stereoselective synthetic procedure to (+)-ferruginyl methyl ether and (+)-sugiyl methyl ether has been developed with high stereoselectivity and overall yield.
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Affiliation(s)
- Gan Yonghong
- National Laboratory of Applied Organic Chemistry and Department of Chemistry, Lanzhou University, Lanzhou 730000, China
| | - Pan Xinfu
- National Laboratory of Applied Organic Chemistry and Department of Chemistry, Lanzhou University, Lanzhou 730000, China
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30
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Gan Y, Li A, Pan X, Chan AS, Yang TK. Stereoselective synthesis of (−)-6,7-dehydroferruginyl methyl ether. ACTA ACUST UNITED AC 2000. [DOI: 10.1016/s0957-4166(00)00007-0] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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31
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Dussault PH, Liu X. Lewis acid-mediated displacements of alkoxydioxolanes: synthesis of a 1,2-dioxolane natural product. Org Lett 1999; 1:1391-3. [PMID: 10825987 DOI: 10.1021/ol990954y] [Citation(s) in RCA: 39] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
[formula: see text] Addition of electron-rich alkenes to the peroxycarbenium ions derived from Lewis acid-mediated ionization of 3-alkoxy-1,2-dioxolanes provides an efficient route for the synthesis of substituted 1,2-dioxolanes. The methodology is illustrated with a rapid synthesis of a 1,2-dioxolane natural product related to the plakinic acids.
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Affiliation(s)
- P H Dussault
- Department of Chemistry, University of Nebraska-Lincoln 68588-0304, USA.
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32
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Narayanan SJ, Sridevi B, Chandrashekar TK, Vij A, Roy R. Novel Core-Modified Expanded Porphyrins with meso-Aryl Substituents: Synthesis, Spectral and Structural Characterization. J Am Chem Soc 1999. [DOI: 10.1021/ja991472k] [Citation(s) in RCA: 99] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Seenichamy Jeyaprakash Narayanan
- Contribution from the Department of Chemistry, Indian Institute of Technology, Kanpur 208016, India, Single-Crystal Diffraction Laboratory, University of Idaho, Moscow, Idaho 83843, andNMR Division, Central Drug Research Institute, Lucknow, India
| | - Bashyam Sridevi
- Contribution from the Department of Chemistry, Indian Institute of Technology, Kanpur 208016, India, Single-Crystal Diffraction Laboratory, University of Idaho, Moscow, Idaho 83843, andNMR Division, Central Drug Research Institute, Lucknow, India
| | - Tavarekere K. Chandrashekar
- Contribution from the Department of Chemistry, Indian Institute of Technology, Kanpur 208016, India, Single-Crystal Diffraction Laboratory, University of Idaho, Moscow, Idaho 83843, andNMR Division, Central Drug Research Institute, Lucknow, India
| | - Ashwani Vij
- Contribution from the Department of Chemistry, Indian Institute of Technology, Kanpur 208016, India, Single-Crystal Diffraction Laboratory, University of Idaho, Moscow, Idaho 83843, andNMR Division, Central Drug Research Institute, Lucknow, India
| | - Raja Roy
- Contribution from the Department of Chemistry, Indian Institute of Technology, Kanpur 208016, India, Single-Crystal Diffraction Laboratory, University of Idaho, Moscow, Idaho 83843, andNMR Division, Central Drug Research Institute, Lucknow, India
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Nakamura Y, Takeuchi S, Ohgo Y, Yamaoka M, Yoshida A, Mikami K. Enantioselective protonation of samarium enolates derived from α-heterosubstituted ketones and lactone by SmI2-mediated reduction. Tetrahedron 1999. [DOI: 10.1016/s0040-4020(99)00143-x] [Citation(s) in RCA: 37] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Nakamura Y, Takeuchi S, Ohgo Y, Yamaoka M, Yoshida A, Mikami K. SmI2-mediated reductive enolization of α-hetero-substituted ketones and enantioselective protonation. Tetrahedron Lett 1997. [DOI: 10.1016/s0040-4039(97)00435-8] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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35
|
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36
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Nakamura Y, Takeuchi S, Ohira A, Ohgo Y. Catalytic enantioselective protonation of samarium enolates by a C2-symmetric chiral diol. Tetrahedron Lett 1996. [DOI: 10.1016/0040-4039(96)00434-0] [Citation(s) in RCA: 40] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
|
37
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Enantioselectivity-promoting factor in enzyme-mediated asymmetric hydrolysis of enol esters. ACTA ACUST UNITED AC 1995. [DOI: 10.1016/1381-1177(95)00002-x] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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Fehr C, Galindo J. Syntheses of the Enantiomers of ?-Cyclogeranic Acid, ?-Cyclocitral, and ?-Damascone: Enantioselective protonation of enolates. Helv Chim Acta 1995. [DOI: 10.1002/hlca.19950780303] [Citation(s) in RCA: 49] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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39
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Lüning U, Wangnick C, Kümmerlin M. Regioselective Protonation of Allyllithium Compounds. ACTA ACUST UNITED AC 1994. [DOI: 10.1002/cber.19941271214] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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Krause N. Substituenteneffekte und Komplexierungsphänomene bei der diastereoselektiven Protonierung chiraler Enolate. Angew Chem Int Ed Engl 1994. [DOI: 10.1002/ange.19941061724] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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41
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Yanagisawa A, Kuribayashi T, Kikuchi T, Yamamoto H. Enantioselective Protonation of Simple Enolates: Chiral Imide as a Chiral Proton Source. ACTA ACUST UNITED AC 1994. [DOI: 10.1002/anie.199401071] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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Yanagisawa A, Kuribayashi T, Kikuchi T, Yamamoto H. Enantioselektive Protonierung einfacher Enolate: ein chirales Imid als Protonenquelle. Angew Chem Int Ed Engl 1994. [DOI: 10.1002/ange.19941060131] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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43
|
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44
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Fehr C, Stempf I, Galindo J. Enantioselective Addition of Aromatic Thiols to a Ketene. ACTA ACUST UNITED AC 1993. [DOI: 10.1002/anie.199310441] [Citation(s) in RCA: 50] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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