1
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Xu B, Zhang Z, Tantillo DJ, Dai M. Concise Total Syntheses of ( -)-Crinipellins A and B Enabled by a Controlled Cargill Rearrangement. J Am Chem Soc 2024. [PMID: 39052841 DOI: 10.1021/jacs.4c07900] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/27/2024]
Abstract
Herein, we report concise total syntheses of diterpene natural products (-)-crinipellins A and B with a tetraquinane skeleton, three adjacent all-carbon quaternary centers, and multiple oxygenated and labile functional groups. Our synthesis features a convergent Kozikowski β-alkylation to unite two readily available building blocks with all the required carbon atoms, an intramolecular photochemical [2 + 2] cycloaddition to install three challenging and adjacent all-carbon quaternary centers and a 5-6-4-5 tetracyclic skeleton, and a controlled Cargill rearrangement to rearrange the 5-6-4-5 tetracyclic skeleton to the desired tetraquinane skeleton. These strategically enabling transformations allowed us to complete total syntheses of (-)-crinipellins A and B in 12 and 13 steps, respectively. The results of quantum chemical computations revealed that the Bronsted acid-catalyzed Cargill rearrangements likely involve stepwise paths to products and the AlR3-catalyzed Cargill rearrangements likely involve a concerted path with asynchronous alkyl shifting events to form the desired product.
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Affiliation(s)
- Bo Xu
- Department of Chemistry, Emory University, Atlanta, Georgia 30322, United States
| | - Ziyao Zhang
- Department of Chemistry, Emory University, Atlanta, Georgia 30322, United States
| | - Dean J Tantillo
- Department of Chemistry, University of California─Davis, Davis, California 95616, United States
| | - Mingji Dai
- Department of Chemistry, Emory University, Atlanta, Georgia 30322, United States
- Department of Pharmacology and Chemical Biology, Emory University, Atlanta, Georgia 30322, United States
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2
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Davies SG, Fletcher AM, Roberts PM, Thomson JE. SuperQuat chiral auxiliaries: design, synthesis, and utility. Org Biomol Chem 2019; 17:1322-1335. [DOI: 10.1039/c8ob02819b] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
The design, synthesis and outline of some of the most common synthetic applications of the SuperQuat (4-substituted 5,5-dimethyloxazolidine-2-one) family of chiral auxiliaries, developed to address the shortcomings of the Evans (4-substituted oxazolidin-2-one) family of chiral auxiliaries, are presented.
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Affiliation(s)
- Stephen G. Davies
- Department of Chemistry
- Chemistry Research Laboratory
- University of Oxford
- Oxford
- UK
| | - Ai M. Fletcher
- Department of Chemistry
- Chemistry Research Laboratory
- University of Oxford
- Oxford
- UK
| | - Paul M. Roberts
- Department of Chemistry
- Chemistry Research Laboratory
- University of Oxford
- Oxford
- UK
| | - James E. Thomson
- Department of Chemistry
- Chemistry Research Laboratory
- University of Oxford
- Oxford
- UK
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3
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Jermaks J, Tallmadge EH, Keresztes I, Collum DB. Lithium Amino Alkoxide-Evans Enolate Mixed Aggregates: Aldol Addition with Matched and Mismatched Stereocontrol. J Am Chem Soc 2018; 140:3077-3090. [PMID: 29457718 PMCID: PMC6059615 DOI: 10.1021/jacs.7b13776] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Abstract
Building on structural and mechanistic studies of lithiated enolates derived from acylated oxazolidinones (Evans enolates) and chiral lithiated amino alkoxides, we found that amino alkoxides amplify the enantioselectivity of aldol additions. The pairing of enantiomeric series affords matched and mismatched stereoselectivities. The structures of mixed tetramers showing 2:2 and 3:1 (alkoxide-rich) stoichiometries are determined spectroscopically. Rate and computational studies provide a viable mechanistic and stereochemical model based on the direct reaction of the 3:1 mixed tetramers, but they raise unanswered questions for the 2:2 mixed aggregates.
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Affiliation(s)
- Janis Jermaks
- Department of Chemistry and Chemical Biology, Baker Laboratory, Cornell University, Ithaca, New York 14853-1301
| | - Evan H. Tallmadge
- Department of Chemistry and Chemical Biology, Baker Laboratory, Cornell University, Ithaca, New York 14853-1301
| | - Ivan Keresztes
- Department of Chemistry and Chemical Biology, Baker Laboratory, Cornell University, Ithaca, New York 14853-1301
| | - David B. Collum
- Department of Chemistry and Chemical Biology, Baker Laboratory, Cornell University, Ithaca, New York 14853-1301
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4
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Sagawa N, Moriya H, Hosokawa S. Syn Selective Vinylogous Mukaiyama Aldol Reaction Using Z,E-Vinylketene N,O-Acetal with Acetals. Org Lett 2016; 19:250-253. [DOI: 10.1021/acs.orglett.6b03549] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Naoya Sagawa
- Department of Applied Chemistry,
Faculty of Science and Engineering, Waseda University, 3-4-1 Ohkubo, Shinjuku-ku, Tokyo 169-8555, Japan
| | - Hiroki Moriya
- Department of Applied Chemistry,
Faculty of Science and Engineering, Waseda University, 3-4-1 Ohkubo, Shinjuku-ku, Tokyo 169-8555, Japan
| | - Seijiro Hosokawa
- Department of Applied Chemistry,
Faculty of Science and Engineering, Waseda University, 3-4-1 Ohkubo, Shinjuku-ku, Tokyo 169-8555, Japan
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5
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Chen ZM, Hilton MJ, Sigman MS. Palladium-Catalyzed Enantioselective Redox-Relay Heck Arylation of 1,1-Disubstituted Homoallylic Alcohols. J Am Chem Soc 2016; 138:11461-4. [PMID: 27571167 PMCID: PMC5039009 DOI: 10.1021/jacs.6b06994] [Citation(s) in RCA: 88] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
An enantioselective redox-relay oxidative Heck arylation of 1,1-disubstituted alkenes to construct β-stereocenters was developed using a new pyridyl-oxazoline ligand. Various 1,2-diaryl carbonyl compounds were readily obtained in moderate yield and good to excellent enantioselectivity. Additionally, analysis of the reaction outcomes using multidimensional correlations revealed that enantioselectivity is tied to specific electronic features of the 1,1-disubstituted alkenol and the extent of polarizability of the ligand.
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Affiliation(s)
- Zhi-Min Chen
- Department of Chemistry, University of Utah, 315 South 1400 East, Salt Lake City, Utah 84112, United States
| | - Margaret J. Hilton
- Department of Chemistry, University of Utah, 315 South 1400 East, Salt Lake City, Utah 84112, United States
| | - Matthew S. Sigman
- Department of Chemistry, University of Utah, 315 South 1400 East, Salt Lake City, Utah 84112, United States
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6
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7
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Davies SG, Fletcher AM, Thomson JE. Direct asymmetric syntheses of chiral aldehydes and ketones via N-acyl chiral auxiliary derivatives including chiral Weinreb amide equivalents. Chem Commun (Camb) 2014; 49:8586-98. [PMID: 23959006 DOI: 10.1039/c3cc45463k] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
This article covers N-acyl chiral auxiliary-based approaches to the asymmetric synthesis of enantiopure aldehydes and ketones. The use of diastereoisomerically pure N-acyl derivatives of chiral auxiliaries (including chiral Weinreb amide equivalents) and their conversion to the corresponding enantiopure aldehydes and ketones in a single synthetic operation by treatment with a hydride reducing agent or an organometallic reagent, respectively, are highlighted.
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Affiliation(s)
- Stephen G Davies
- Department of Chemistry, Chemistry Research Laboratory, University of Oxford, Mansfield Road, Oxford, OX1 3TA, UK.
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8
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Brambilla M, Davies SG, Fletcher AM, Thomson JE. Asymmetric and enantiospecific syntheses of 1-hydroxymethyl pyrrolizidine alkaloids. ACTA ACUST UNITED AC 2014. [DOI: 10.1016/j.tetasy.2014.02.001] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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9
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Chaubey NR, Ghosh SK. An enantiodivergent and formal synthesis of paroxetine enantiomers by asymmetric desymmetrization of 3-(4-fluorophenyl)glutaric anhydride with a chiral SuperQuat oxazolidin-2-one. ACTA ACUST UNITED AC 2012. [DOI: 10.1016/j.tetasy.2012.08.001] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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10
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11
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Bélanger É, Pouliot MF, Courtemanche MA, Paquin JF. Design, Synthesis, and Applications of Potential Substitutes of t-Bu-Phosphinooxazoline in Pd-Catalyzed Asymmetric Transformations and Their Use for the Improvement of the Enantioselectivity in the Pd-Catalyzed Allylation Reaction of Fluorinated Allyl Enol Carbonates. J Org Chem 2011; 77:317-31. [DOI: 10.1021/jo2019653] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Étienne Bélanger
- Canada Research Chair
in Organic and Medicinal Chemistry,
Département de chimie, Université Laval, 1045 avenue de la Médecine, Québec, QC, Canada G1V 0A6
| | - Marie-France Pouliot
- Canada Research Chair
in Organic and Medicinal Chemistry,
Département de chimie, Université Laval, 1045 avenue de la Médecine, Québec, QC, Canada G1V 0A6
| | - Marc-André Courtemanche
- Canada Research Chair
in Organic and Medicinal Chemistry,
Département de chimie, Université Laval, 1045 avenue de la Médecine, Québec, QC, Canada G1V 0A6
| | - Jean-François Paquin
- Canada Research Chair
in Organic and Medicinal Chemistry,
Département de chimie, Université Laval, 1045 avenue de la Médecine, Québec, QC, Canada G1V 0A6
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12
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Peed J, Davies IR, Peacock LR, Taylor JE, Kociok-Köhn G, Bull SD. Dihydroxylation-Based Approach for the Asymmetric Syntheses of Hydroxy-γ-butyrolactones. J Org Chem 2011; 77:543-55. [PMID: 22077239 DOI: 10.1021/jo2021289] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Affiliation(s)
- Jennifer Peed
- Department
of Chemistry, University of Bath, Claverton
Down, Bath, BA2 7AY,
United Kingdom
| | - Iwan R. Davies
- Department
of Chemistry, University of Bath, Claverton
Down, Bath, BA2 7AY,
United Kingdom
| | - Lucy R. Peacock
- Department
of Chemistry, University of Bath, Claverton
Down, Bath, BA2 7AY,
United Kingdom
| | - James E. Taylor
- Department
of Chemistry, University of Bath, Claverton
Down, Bath, BA2 7AY,
United Kingdom
| | - Gabriele Kociok-Köhn
- Department
of Chemical Crystallography, University of Bath, Claverton Down, Bath, BA2 7AY,
United Kingdom
| | - Steven D. Bull
- Department
of Chemistry, University of Bath, Claverton
Down, Bath, BA2 7AY,
United Kingdom
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13
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Chellat MF, Proust N, Lauer MG, Stambuli JP. Synthesis of Key Fragments of Leiodelide A. Org Lett 2011; 13:3246-9. [PMID: 21612207 DOI: 10.1021/ol201183f] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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14
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Lawson KV, Rose TE, Harran PG. Synthesis of a designed sesquiterpenoid that forms useful composites with peptides and related oligomers. Tetrahedron Lett 2011. [DOI: 10.1016/j.tetlet.2010.11.083] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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15
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Davies SG, Fletcher AM, Hermann GJ, Poce G, Roberts PM, Smith AD, Sweet MJ, Thomson JE. Doubly diastereoselective conjugate addition of enantiopure lithium amides to enantiopure N-enoyl oxazolidin-2-ones: a mechanistic probe. ACTA ACUST UNITED AC 2010. [DOI: 10.1016/j.tetasy.2010.03.033] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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16
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Alkylation and aldol reactions of acyl derivatives of N-1-(1′-naphthyl)ethyl-O-tert-butylhydroxylamine: asymmetric synthesis of α-alkoxy-, α-substituted-β-alkoxy- and α,β-dialkoxyaldehydes. Tetrahedron 2010. [DOI: 10.1016/j.tet.2010.03.105] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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17
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Stueckler C, Mueller NJ, Winkler CK, Glueck SM, Gruber K, Steinkellner G, Faber K. Bioreduction of alpha-methylcinnamaldehyde derivatives: chemo-enzymatic asymmetric synthesis of Lilial and Helional. Dalton Trans 2010; 39:8472-6. [PMID: 20461254 DOI: 10.1039/c002971h] [Citation(s) in RCA: 53] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Nonracemic aryl-substituted alpha-methyldihydrocinnamaldehyde derivatives employed as olfactory principles in perfumes (Lilial, Helional) were obtained via enzymatic reduction of the corresponding cinnamaldehyde precursors using cloned and overexpressed ene-reductases. (R)-Enantiomers were obtained using the old-yellow-enzyme (OYE) homolog YqjM from Bacillus subtilis and 12-oxophytodienoic acid reductase isoenzyme OPR1 from tomato (e.e.(max) 53%), and (S)-aldehydes were furnished in up to 97% e.e. using isoenzyme OPR3, nicotinamide 2-cyclohexene-1-one reductase NCR from Zymomonas mobilis and yeast OYE isoenzymes 1-3 under optimised reaction conditions in the presence of t-butyl methyl ether as the co-solvent. The stereochemical outcome of the reduction of alpha-methylcinnamaldehyde using NCR and OYEs 1-3 [previously reported to be (R)] was unambiguously corrected to be (S).
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Affiliation(s)
- Clemens Stueckler
- Department of Chemistry, Organic & Bioorganic Chemistry, Heinrichstrasse 28, A-8010, Graz, Austria
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18
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Lin D, Deng G, Wang J, Ding X, Jiang H, Liu H. Efficient Synthesis of Symmetrical α,α-Disubstituted β-Amino Acids and α,α-Disubstituted Aldehydes via Dialkylation of Nucleophilic β-Alanine Equivalent. J Org Chem 2010; 75:1717-22. [PMID: 20141112 DOI: 10.1021/jo902699t] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Daizong Lin
- The Center for Drug Discovery and Design, State Key Laboratory of Drug Research, Shanghai Institute of Materia Medica, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, Shanghai 201203, People’s Republic of China
| | - Guanghui Deng
- The Center for Drug Discovery and Design, State Key Laboratory of Drug Research, Shanghai Institute of Materia Medica, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, Shanghai 201203, People’s Republic of China
| | - Jiang Wang
- The Center for Drug Discovery and Design, State Key Laboratory of Drug Research, Shanghai Institute of Materia Medica, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, Shanghai 201203, People’s Republic of China
| | - Xiao Ding
- The Center for Drug Discovery and Design, State Key Laboratory of Drug Research, Shanghai Institute of Materia Medica, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, Shanghai 201203, People’s Republic of China
| | - Hualiang Jiang
- The Center for Drug Discovery and Design, State Key Laboratory of Drug Research, Shanghai Institute of Materia Medica, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, Shanghai 201203, People’s Republic of China
| | - Hong Liu
- The Center for Drug Discovery and Design, State Key Laboratory of Drug Research, Shanghai Institute of Materia Medica, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, Shanghai 201203, People’s Republic of China
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19
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Sibi MP, Soeta T, Jasperse CP. Nitrile Ylides: Diastereoselective Cycloadditions using Chiral Oxzolidinones Without Lewis Acid. Org Lett 2009; 11:5366-9. [DOI: 10.1021/ol9018584] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Mukund P. Sibi
- Department of Chemistry and Molecular Biology, North Dakota State University, NDSU Department 2735, PO Box 6050, Fargo, North Dakota 58108-6050
| | - Takahiro Soeta
- Department of Chemistry and Molecular Biology, North Dakota State University, NDSU Department 2735, PO Box 6050, Fargo, North Dakota 58108-6050
| | - Craig P. Jasperse
- Department of Chemistry and Molecular Biology, North Dakota State University, NDSU Department 2735, PO Box 6050, Fargo, North Dakota 58108-6050
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20
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Chernega AN, Davies SG, Goodwin CJ, Hepworth D, Kurosawa W, Roberts PM, Thomson JE. The Chiral Auxiliary N-1-(1′-Naphthyl)ethyl-O-tert-butylhydroxylamine: A Chiral Weinreb Amide Equivalent. Org Lett 2009; 11:3254-7. [DOI: 10.1021/ol901174t] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Alexander N. Chernega
- Department of Chemistry, Chemistry Research Laboratory, University of Oxford, Mansfield Road, Oxford OX1 3TA, U.K., and AstraZeneca R&D Charnwood, Process R&D, Bakewell Road, Loughborough, Leicestershire LE11 5RH, U.K
| | - Stephen G. Davies
- Department of Chemistry, Chemistry Research Laboratory, University of Oxford, Mansfield Road, Oxford OX1 3TA, U.K., and AstraZeneca R&D Charnwood, Process R&D, Bakewell Road, Loughborough, Leicestershire LE11 5RH, U.K
| | - Christopher J. Goodwin
- Department of Chemistry, Chemistry Research Laboratory, University of Oxford, Mansfield Road, Oxford OX1 3TA, U.K., and AstraZeneca R&D Charnwood, Process R&D, Bakewell Road, Loughborough, Leicestershire LE11 5RH, U.K
| | - David Hepworth
- Department of Chemistry, Chemistry Research Laboratory, University of Oxford, Mansfield Road, Oxford OX1 3TA, U.K., and AstraZeneca R&D Charnwood, Process R&D, Bakewell Road, Loughborough, Leicestershire LE11 5RH, U.K
| | - Wataru Kurosawa
- Department of Chemistry, Chemistry Research Laboratory, University of Oxford, Mansfield Road, Oxford OX1 3TA, U.K., and AstraZeneca R&D Charnwood, Process R&D, Bakewell Road, Loughborough, Leicestershire LE11 5RH, U.K
| | - Paul M. Roberts
- Department of Chemistry, Chemistry Research Laboratory, University of Oxford, Mansfield Road, Oxford OX1 3TA, U.K., and AstraZeneca R&D Charnwood, Process R&D, Bakewell Road, Loughborough, Leicestershire LE11 5RH, U.K
| | - James E. Thomson
- Department of Chemistry, Chemistry Research Laboratory, University of Oxford, Mansfield Road, Oxford OX1 3TA, U.K., and AstraZeneca R&D Charnwood, Process R&D, Bakewell Road, Loughborough, Leicestershire LE11 5RH, U.K
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21
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Cheeseman M, Davies IR, Axe P, Johnson AL, Bull SD. A temporary stereocentre approach for the asymmetric synthesis of chiral cyclopropane-carboxaldehydes. Org Biomol Chem 2009; 7:3537-48. [PMID: 19675911 DOI: 10.1039/b908600e] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Affiliation(s)
- Matt Cheeseman
- Department of Chemistry, University of Bath, Bath, UK BA2 7AY
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22
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Chemo-enzymatic synthesis of new ferrocenyl-oxazolidinones and their application as chiral auxiliaries. ACTA ACUST UNITED AC 2008. [DOI: 10.1016/j.tetasy.2008.03.009] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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23
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Abstract
[reaction: see text] A stereocontrolled total synthesis of (-)-kainic acid is described. A fully functionalized trisubstituted pyrrolidine ring was constructed by ring-closing metathesis of an acrylate derivative followed by an intramolecular Michael addition of the resultant alpha,beta-unsaturated lactone with high diastereoselectivity. Two alternative protocols for the construction of the alpha,beta-unsaturated lactone were also developed.
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Affiliation(s)
- Hiroshi Sakaguchi
- Graduate School of Pharmaceutical Sciences, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
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24
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The 3-[3α(2α-Hydroxy)pinane]-4,5-(pinan)-1,3-oxazolidine Synthesis, Structure and Properties. B KOREAN CHEM SOC 2007. [DOI: 10.5012/bkcs.2007.28.1.089] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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25
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Davies SG, Roberts PM, Smith AD. Asymmetric three- and [2 + 1]-component conjugate addition reactions for the stereoselective synthesis of polysubstituted piperidinones. Org Biomol Chem 2007; 5:1405-15. [PMID: 17464410 DOI: 10.1039/b701226h] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The efficiency and stereoselectivity of the conjugate addition of lithium (Z)- or (E)-beta-amino ester enolates, generated by lithium amide conjugate addition to an alpha,beta-unsaturated ester or deprotonation of a beta-amino ester, respectively, to a range of alpha,beta-unsaturated acceptors has been investigated. Deprotonation of a beta-amino ester with LDA, followed by conjugate addition to a chiral alpha,beta-unsaturated oxazolidinone gives high 2,3-anti selectivity ( approximately 90% d.e.), with hydrogenolysis and purification to homogeneity generating stereodefined trisubstituted piperidinones as single stereoisomers. Asymmetric three-component couplings of alpha,beta-unsaturated esters and alkylidene malonates initiated by lithium amide conjugate addition proceeds with high levels of 2,3-anti stereoselectivity, with hydrogenolysis giving tetrasubstituted piperidinones.
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Affiliation(s)
- Stephen G Davies
- Department of Organic Chemistry, Chemistry Research Laboratory, University of Oxford, Mansfield Road, Oxford, OX1 3TA, UK.
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Bull SD, Davies SG, Garner AC, Kruchinin D, Key MS, Roberts PM, Savory ED, Smith AD, Thomson JE. SuperQuat 5,5-dimethyl-4-iso-propyloxazolidin-2-one as a mimic of Evans 4-tert-butyloxazolidin-2-one. Org Biomol Chem 2006; 4:2945-64. [PMID: 16855744 DOI: 10.1039/b605244d] [Citation(s) in RCA: 55] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The incorporation of a gem-dimethyl group at the 5-position of a chiral oxazolidinone biases the conformation of the adjacent C(4)-stereodirecting group such that the gem-dimethyl-4-iso-propyl combination mimics a C(4)-tert-butyl group, providing higher levels of stereocontrol than a simple 4-iso-propyloxazolidinone. The generality of this principle is demonstrated with applications in stereoselective enolate alkylations, kinetic resolutions, Diels-Alder cycloadditions and Pd-catalysed asymmetric acetalisation reactions.
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Affiliation(s)
- Steven D Bull
- The Department of Organic Chemistry, University of Oxford, Chemistry Research Laboratory, UK.
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27
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Davies SG, Garner AC, Roberts PM, Smith AD, Sweet MJ, Thomson JE. Oxazinanones as chiral auxiliaries: synthesis and evaluation in enolate alkylations and aldol reactions. Org Biomol Chem 2006; 4:2753-68. [PMID: 16826300 DOI: 10.1039/b604073j] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Homochiral beta-amino esters (prepared on multigram scale by lithium amide conjugate addition) are readily transformed into oxazinanones. N-acyl derivatives of oxazinanones undergo stereoselective enolate alkylation reactions, with higher stereoselectivities observed for the enolate alkylation of (R)-N-propanoyl-4-iso-propyl-6,6-dimethyl-oxazinan-2-one than the corresponding Evans oxazolidin-2-one. A C(4)-iso-propyl stereodirecting group within the oxazinanone conveys higher stereoselectivity than the analogous C(4)-phenyl substituent. gem-Dimethyl substitution at C(6) within the oxazinanone framework facilitates exclusive exocyclic cleavage upon hydrolysis to furnish alpha-substituted carboxylic acid derivatives and the parent oxazinanone in good yield. Asymmetric aldol reactions of a range of aromatic and aliphatic aldehydes with the chlorotitanium enolate of (R)-N-propanoyl-4-iso-propyl-6,6-dimethyl-oxazinan-2-one proceed with excellent diastereoselectivity. Hydrolysis of the aldol products affords homochiral alpha-methyl-beta-hydroxy-carboxylic acids.
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Affiliation(s)
- Stephen G Davies
- Department of Organic Chemistry, University of Oxford, Chemistry Research Laboratory, Mansfield Road, Oxford, UK OX1 3TA.
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Bueno A, Moreno RM, Moyano A. 1-Amino-1-ferrocenyl-2-methyl-2-propanol: a case study on the conformational control of asymmetric induction. ACTA ACUST UNITED AC 2005. [DOI: 10.1016/j.tetasy.2005.03.031] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Chapter 5.7 Five-Membered ring systems with O & N Atoms. ACTA ACUST UNITED AC 2005. [DOI: 10.1016/s0959-6380(05)80053-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register]
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Davies SG, Hunter IA, Nicholson RL, Roberts P, Savory ED, Smith AD. N-α-Benzyloxyacetyl derivatives of (S)-4-benzyl-5,5-dimethyloxazolidin-2-one for the asymmetric synthesis of differentially protected α,β-dihydroxyaldehydes. Tetrahedron 2004. [DOI: 10.1016/j.tet.2004.05.123] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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Potter CV, Corkill M, Dean JL, Kybett AP, Kidd R, James M, Saxton H. Comment: 2004’s fastest organic and biomolecular chemistry! NEW J CHEM 2004. [DOI: 10.1039/b417567k] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Potter CV, Freshwater J, Dean JL, Kybett AP, Kidd R, James M, Saxton H. Comment: 2004’s fastest organic and biomolecular chemistry! Chem Soc Rev 2004; 33:567-72. [PMID: 15592621 DOI: 10.1039/b417566m] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
In January 2003, the Royal Society of Chemistry launched Organic & Biomolecular Chemistry (OBC)--a journal promising to provide high quality research from all aspects of synthetic, physical and biomolecular organic chemistry. The journal was set to build upon the foundations laid down by its predecessor publications (J. Chem. Soc., Perkin Trans. 1 and J. Chem. Soc., Perkin Trans. 2) as well as complement the subject coverage already published in prestigious general chemistry journals such as Chemical Communications and Chemical Society Reviews. Nearly two years on, just how is the programme developing and what can the community expect to see from the Royal Society of Chemistry (RSC)?
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Affiliation(s)
- Caroline V Potter
- Royal Society of Chemistry, Thomas Graham House, Cambridge, UK CB4 0WF.
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Potter CV, Thomas S, Dean JL, Kybett AP, Kidd R, James M, Saxton H. Comment: 2004’s fastest organic and biomolecular chemistry! Chem Commun (Camb) 2004:2781-6. [PMID: 15599407 DOI: 10.1039/b417565b] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
In January 2004, the Royal Society of Chemistry launched Organic & Biomolecular Chemistry (OBC) - a journal promising to provide high quality research from all aspects of synthetic, physical and biomolecular organic chemistry. The journal was set to build upon the foundations laid down by its predecessor publications (J. Chem. Soc., Perkin Trans. 1 and J. Chem. Soc., Perkin Trans. 2) as well as complement the subject coverage already published in prestigious general chemistry journals such as Chemical Communications and Chemical Society Reviews. Nearly two years on, just how is the programme developing and what can the community expect to see from the Royal Society of Chemistry (RSC)?
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Affiliation(s)
- Caroline V Potter
- Royal Society of Chemistry, Thomas Graham House, Cambridge, UK CB4 0WF.
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Potter CV, McCann G, Dean JL, Kybett AP, Kidd R, James M, Canning M. Comment: 2004’s fastest organic and biomolecular chemistry! ACTA ACUST UNITED AC 2004. [DOI: 10.1039/b417514j] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Potter CV, Dean JL, Kybett AP, Kidd R, James M, Canning M. Comment: 2004’s fastest organic and biomolecular chemistry! Org Biomol Chem 2004; 2:3535-40. [PMID: 15592609 DOI: 10.1039/b417338b] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
In January 2003, the Royal Society of Chemistry launched Organic & Biomolecular Chemistry (OBC)--a journal promising to provide high quality research from all aspects of synthetic, physical and biomolecular organic chemistry. The journal was set to build upon the foundations laid down by its predecessor publications (J. Chem. Soc., Perkin Trans. 1 and J. Chem. Soc., Perkin Trans. 2) as well as complement the subject coverage already published in prestigious general chemistry journals such as Chemical Communications and Chemical Society Reviews. Nearly two years on, just how is the programme developing and what can the community expect to see from the Royal Society of Chemistry (RSC)?
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Affiliation(s)
- Caroline V Potter
- Royal Society of Chemistry, Thomas Graham House, Cambridge, UK CB4 0WF.
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