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Chang X, Sun XS, Che C, Hu YZ, Tao HY, Wang CJ. Copper(I)-Catalyzed Kinetic Resolution of exo-3-Oxodicyclopentadienes and endo-3-Oxodicyclopentadiene. Org Lett 2019; 21:1191-1196. [PMID: 30707591 DOI: 10.1021/acs.orglett.9b00136] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
The first example of highly efficient kinetic resolution of exo-3-oxodicyclopentadienes and endo-3-oxodicyclopentadiene has been developed by means of Cu(I)-catalyzed asymmetric 1,3-dipolar cycloaddition of azomethine ylide. Compared with the existing methodologies for those synthetically important optically active convex molecules, the current protocol provides an alternative but more practical approach from the readily available racemic starting materials, which is free from the repetitive reduction/oxidation steps in the enzymatic resolution or the indispensable stoichiometric amount of chirality-induction reagents.
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Affiliation(s)
- Xin Chang
- College of Chemistry and Molecular Sciences , Wuhan University , Wuhan 430072 , China
| | - Xi-Shang Sun
- College of Chemistry and Molecular Sciences , Wuhan University , Wuhan 430072 , China
| | - Chao Che
- College of Chemistry and Molecular Sciences , Wuhan University , Wuhan 430072 , China
| | - Yuan-Zheng Hu
- College of Chemistry and Molecular Sciences , Wuhan University , Wuhan 430072 , China
| | - Hai-Yan Tao
- College of Chemistry and Molecular Sciences , Wuhan University , Wuhan 430072 , China
| | - Chun-Jiang Wang
- College of Chemistry and Molecular Sciences , Wuhan University , Wuhan 430072 , China.,State Key Laboratory of Elemento-organic Chemistry , Nankai University , Tianjin 300071 , China
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2
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Salem AB, Di Giuseppe G, Anesi A, Hammami S, Mighri Z, Guella G. Natural Products among Brown Algae: The Case of Cystoseira schiffneri Hamel (Sargassaceae, Phaeophyceae). Chem Biodivers 2017; 14. [PMID: 27981801 DOI: 10.1002/cbdv.201600333] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2016] [Accepted: 12/14/2016] [Indexed: 11/08/2022]
Abstract
A chemotaxonomic study on the marine brown alga Cystoseira schiffneri collected from the Tunisian marine coast allowed us to identify kjellmanianone (1) and a new isololiolide derivative named schiffnerilolide (2). The structure elucidation and the assignment of relative configurations of the isolated natural products were based on advanced mass spectrometric and nuclear magnetic resonance techniques. This outcome suggested a close phylogenetic relationship of C. schiffneri with brown algae belonging to genus Sargassum C. Agardh. Molecular characterization using the nuclear small subunit rRNA (SSU rRNA) gene (18S) sequence as genetic marker was made. Pigment analysis showed a significant seasonal change of carotenoids, in particular of fucoxanthin and fucoxanthinol. Also galactolipids, the main constituents of the thylakoid membranes, showed remarkable seasonal changes.
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Affiliation(s)
- Abdelkader Ben Salem
- Research Unit of Applied Chemistry and Environment (UR13ES63), Faculty of Sciences of Monastir, Avenue of the Environment, 5000 Monastir, University of Monastir, Tunisia
- Laboratory of Bioorganic Chemistry, Department of Physics, University of Trento, 38123, Povo, Trento, Italy
| | - Graziano Di Giuseppe
- Unit of Zoology-Anthropology, Department of Biology, University of Pisa, 56126, Pisa, Italy
| | - Andrea Anesi
- Laboratory of Bioorganic Chemistry, Department of Physics, University of Trento, 38123, Povo, Trento, Italy
| | - Saoussen Hammami
- Research Unit of Applied Chemistry and Environment (UR13ES63), Faculty of Sciences of Monastir, Avenue of the Environment, 5000 Monastir, University of Monastir, Tunisia
| | - Zine Mighri
- Research Unit of Applied Chemistry and Environment (UR13ES63), Faculty of Sciences of Monastir, Avenue of the Environment, 5000 Monastir, University of Monastir, Tunisia
| | - Graziano Guella
- Laboratory of Bioorganic Chemistry, Department of Physics, University of Trento, 38123, Povo, Trento, Italy
- Biophysical Institute, CNR, 38123, Povo, Trento, Italy
- Centre for Agriculture, Food and Environment, University of Trento, via Mach 1, 38010, San Michele all Adige, Trento, Italy
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3
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Simeonov SP, Nunes JPM, Guerra K, Kurteva VB, Afonso CAM. Synthesis of Chiral Cyclopentenones. Chem Rev 2016; 116:5744-893. [DOI: 10.1021/cr500504w] [Citation(s) in RCA: 159] [Impact Index Per Article: 19.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Affiliation(s)
- Svilen P. Simeonov
- Institute
of Organic Chemistry with Centre of Phytochemistry, Bulgarian Academy of Sciences, Acad. G. Bonchev str, bl.9, 1113 Sofia, Bulgaria
| | - João P. M. Nunes
- Department
of Chemistry, University College London, London WC1H 0AJ, United Kingdom
| | - Krassimira Guerra
- Research
Institute for Medicines (iMed.ULisboa), Faculty of Pharmacy, Universidade de Lisboa, Av. Prof. Gama Pinto, 1649-003 Lisboa, Portugal
| | - Vanya B. Kurteva
- Institute
of Organic Chemistry with Centre of Phytochemistry, Bulgarian Academy of Sciences, Acad. G. Bonchev str, bl.9, 1113 Sofia, Bulgaria
| | - Carlos A. M. Afonso
- Research
Institute for Medicines (iMed.ULisboa), Faculty of Pharmacy, Universidade de Lisboa, Av. Prof. Gama Pinto, 1649-003 Lisboa, Portugal
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4
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Das P, Valente EJ, Hamme AT. A Model Study toward the Concise Synthesis of Bromotyrosine Derived Spiroisoxazoline Natural Products and Analogous Core Structures. European J Org Chem 2014; 2014:2659-2663. [PMID: 24891836 PMCID: PMC4039208 DOI: 10.1002/ejoc.201400009] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/02/2014] [Indexed: 11/06/2022]
Abstract
A model study of the first non-aromatic ring based approach toward α-hydroxyspiroisoxazolines resembling the bromotyrosine derived natural product and analogous spiroisoxazoline core structures were implemented. The desired molecular architecture was achieved through the multifunctionalization of a key 1,3-diketo spiroisoxazoline. Our strategy could serve as an efficient alternative of previously developed approaches that utilize an aromatic ring oxidation as the essential step to synthesize this class of natural products.
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Affiliation(s)
- Prasanta Das
- Department of Chemistry & Biochemistry, Jackson State University 1400 J. R. Lynch St, PO Box 17910, Jackson, Ms 39217, USA, Fax: (+)1 601 979 3674, Tel: (+)1 601 979 3713, Homepage: http://www.jsums.edu/chemistry/ashton-t-hamme-ii/
| | - Edward J. Valente
- Department of Chemistry, University of Portland, 5000 N Willamette Blvd., Portland, OR 97203, USA
| | - Ashton T. Hamme
- Department of Chemistry & Biochemistry, Jackson State University 1400 J. R. Lynch St, PO Box 17910, Jackson, Ms 39217, USA, Fax: (+)1 601 979 3674, Tel: (+)1 601 979 3713, Homepage: http://www.jsums.edu/chemistry/ashton-t-hamme-ii/
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5
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Baidya M, Griffin KA, Yamamoto H. Catalytic enantioselective O-nitrosocarbonyl aldol reaction of β-dicarbonyl compounds. J Am Chem Soc 2012; 134:18566-9. [PMID: 23106266 PMCID: PMC3515642 DOI: 10.1021/ja309311z] [Citation(s) in RCA: 92] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
The first example of a Cu-catalyzed asymmetric O-nitrosocarbonyl aldol reaction is described. This novel protocol allows convenient access to highly enantioenriched α-hydroxy-β-ketoesters including the antibacterial natural product kjellmanianone (up to 99% ee). MnO(2) was introduced as a mild efficient oxidant for the in situ generation of nitrosocarbonyl species from hydroxamic acid derivatives.
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Affiliation(s)
- Mahiuddin Baidya
- Department of Chemistry, The University of Chicago, Illinois 60637, United States
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6
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Rafiee E, Eavani S. Polyoxometalate-based acid salts with tunable separation properties as recyclable Brönsted acid catalysts for the synthesis of β-keto enol ethers. CATAL COMMUN 2012. [DOI: 10.1016/j.catcom.2012.04.009] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022] Open
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7
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Eshghi H, Hassankhani A. Phosphorus pentoxide supported on silica gel and alumina (P2O5/SiO2, P2O5/Al2O3) as useful catalysts in organic synthesis. JOURNAL OF THE IRANIAN CHEMICAL SOCIETY 2012. [DOI: 10.1007/s13738-011-0057-0] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/14/2022]
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8
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Cambeiro XC, Martín-Rapún R, Miranda PO, Sayalero S, Alza E, Llanes P, Pericàs MA. Continuous-flow enantioselective α-aminoxylation of aldehydes catalyzed by a polystyrene-immobilized hydroxyproline. Beilstein J Org Chem 2011; 7:1486-93. [PMID: 22238521 PMCID: PMC3252847 DOI: 10.3762/bjoc.7.172] [Citation(s) in RCA: 49] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2011] [Accepted: 10/17/2011] [Indexed: 11/28/2022] Open
Abstract
The application of polystyrene-immobilized proline-based catalysts in packed-bed reactors for the continuous-flow, direct, enantioselective α-aminoxylation of aldehydes is described. The system allows the easy preparation of a series of β-aminoxy alcohols (after a reductive workup) with excellent optical purity and with an effective catalyst loading of ca. 2.5% (four-fold reduction compared to the batch process) working at residence times of ca. 5 min.
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Affiliation(s)
- Xacobe C Cambeiro
- Institute of Chemical Research of Catalonia (ICIQ). Avda. Països Catalans, 16. E-43007, Tarragona, Spain
| | - Rafael Martín-Rapún
- Institute of Chemical Research of Catalonia (ICIQ). Avda. Països Catalans, 16. E-43007, Tarragona, Spain
| | - Pedro O Miranda
- Institute of Chemical Research of Catalonia (ICIQ). Avda. Països Catalans, 16. E-43007, Tarragona, Spain
| | - Sonia Sayalero
- Institute of Chemical Research of Catalonia (ICIQ). Avda. Països Catalans, 16. E-43007, Tarragona, Spain
| | - Esther Alza
- Institute of Chemical Research of Catalonia (ICIQ). Avda. Països Catalans, 16. E-43007, Tarragona, Spain
| | - Patricia Llanes
- Institute of Chemical Research of Catalonia (ICIQ). Avda. Països Catalans, 16. E-43007, Tarragona, Spain
| | - Miquel A Pericàs
- Institute of Chemical Research of Catalonia (ICIQ). Avda. Països Catalans, 16. E-43007, Tarragona, Spain
- Departament de Química Orgànica, Universitat de Barcelona. Avda. Martí I Franqués, 1. E-08028, Barcelona, Spain
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9
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Wilke BI, Goodenough AK, Bausch CC, Cline EN, Leigh Abrams M, Fayer EL, Cermak DM. Synthesis and characterization of novel spirooxazacamphorsultam derivatives. Tetrahedron Lett 2010. [DOI: 10.1016/j.tetlet.2010.10.105] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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10
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Yu J, Cui J, Zhang C. A Simple and Effective Method for α-Hydroxylation of β-Dicarbonyl Compounds Using Oxone as an Oxidant without a Catalyst. European J Org Chem 2010. [DOI: 10.1002/ejoc.201000940] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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11
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Abstract
We have discovered that N-sulfonyl oxaziridines react with a broad range of olefins in the presence of iron salts to afford 1,3-oxazolidines. This process provides access to 1,2-aminoalcohols with the opposite sense of regioselectivity produced from the copper-catalyzed oxyamination previously reported by our laboratories. Thus, either regioisomeric form of 1,2-aminoalcohols can easily be obtained from the reaction of oxaziridines with olefins, and the sense of regioselectivity can be controlled by the appropriate choice of inexpensive, nontoxic, first-row transition-metal catalyst.
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Affiliation(s)
- Kevin S. Williamson
- Department of Chemistry, University of Wisconsin–Madison, 1101 University Avenue, Madison, Wisconsin 53706
| | - Tehshik P. Yoon
- Department of Chemistry, University of Wisconsin–Madison, 1101 University Avenue, Madison, Wisconsin 53706
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12
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Breuning M, Häuser T, Tanzer EM. A Novel One-Pot Procedure for the Stereoselective Synthesis of α-Hydroxy Esters from Ortho Esters. Org Lett 2009; 11:4032-5. [DOI: 10.1021/ol901214n] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Matthias Breuning
- Universität Würzburg, Institut für Organische Chemie, Am Hubland, 97074 Würzburg, Germany
| | - Tobias Häuser
- Universität Würzburg, Institut für Organische Chemie, Am Hubland, 97074 Würzburg, Germany
| | - Eva-Maria Tanzer
- Universität Würzburg, Institut für Organische Chemie, Am Hubland, 97074 Würzburg, Germany
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13
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Das B, Laxminarayana K, Ravikanth B. Application of heterogeneous catalysts for an efficient synthesis of β-keto enol ethers. ACTA ACUST UNITED AC 2007. [DOI: 10.1016/j.molcata.2007.02.041] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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14
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Curini M, Epifano F, Genovese S. Ytterbium triflate catalyzed synthesis of β-keto enol ethers. Tetrahedron Lett 2006. [DOI: 10.1016/j.tetlet.2006.04.121] [Citation(s) in RCA: 49] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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15
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Banerjee B, Mandal SK, Roy SC. Cerium(IV) Ammonium Nitrate-catalyzed Synthesis of β-Keto Enol Ethers from Cyclic β-Diketones and Their Deprotection. CHEM LETT 2006. [DOI: 10.1246/cl.2006.16] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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16
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17
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Toullec PY, Bonaccorsi C, Mezzetti A, Togni A. Expanding the scope of asymmetric electrophilic atom-transfer reactions: titanium- and ruthenium-catalyzed hydroxylation of beta-ketoesters. Proc Natl Acad Sci U S A 2004; 101:5810-4. [PMID: 15071186 PMCID: PMC395990 DOI: 10.1073/pnas.0307716101] [Citation(s) in RCA: 114] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
The enantioselective formation of a quaternary stereogenic center coinciding with a hydroxylation process is a very rare reaction from a homogeneous catalysis point of view. Indeed, to our knowledge, no asymmetric transition-metal-catalyzed direct hydroxylation has been reported before. We describe here our initial study concerning the enantioselective alpha-hydroxylation of various beta-ketoesters catalyzed by Lewis-acidic complexes. Specifically, it was found that the Ti complex [TiCl(2)((R,R)-1-Np-TADDOLato)(MeCN)(2)] affords the hydroxylated products in high yield and enantioselectivities up to 94% enantiomeric excess when using 2-(phenylsulphonyl)-3-(4-nitrophenyl)oxaziridine as the oxidizing agent. Chiral enantiopure compounds of the latter type have been used previously in stoichiometric asymmetric hydroxylation reactions. We also show that, in a complementary approach with H(2)O(2) as the oxidant, the Ru(II) complex [RuCl(OE(2))((S,S)-PNNP)]PF(6) catalyzes the same type of transformation in a case of substrates showing a very substantial extent of enolization under reaction conditions; being, however, unreactive toward only weakly enolized beta-ketoesters.
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Affiliation(s)
- Patrick Y Toullec
- Department of Chemistry and Applied Biosciences, Swiss Federal Institute of Technology, ETH-Hönggerberg, CH-8093 Zurich, Switzerland
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18
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Abstract
A direct route to enantiomerically pure (-)-kjellmanianone is reported. The synthesis involves a cerium-catalyzed alpha-hydroxylation and an enzyme-catalyzed procedure to resolve tertiary alcohols at key stages. The intermediate beta-oxo ester was alpha-hydroxylated to give good yields of racemic kjellmanianone. The resolution of the racemic material was achieved by enzymatic saponification, followed by a chemical decarboxylation sequence to give enantiopure (-)-kjellmanianone with 99 % ee. Bromination then afforded the (-)-bromo derivative, whose X-ray structure provided evidence for the R configuration of (-)-kjellmanianone.
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Affiliation(s)
- Jens Christoffers
- Institut für Organische Chemie der Universität Stuttgart, Pfaffenwaldring 55, 70569 Stuttgart, Germany.
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19
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Momiyama N, Yamamoto H. Catalytic enantioselective synthesis of alpha-aminooxy and alpha-hydroxy ketone using nitrosobenzene. J Am Chem Soc 2003; 125:6038-9. [PMID: 12785817 DOI: 10.1021/ja0298702] [Citation(s) in RCA: 199] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The highly enantioselective and O-selective nitroso aldol reaction of tin enolates 2 and nitrosobenzene (1) has been developed with the use of (R)-BINAP-silver complexes as a catalyst. After the various silver salts were surveyed, the AgOTf and the AgClO4 complex were found to be optimal in the O-selective nitroso aldol reaction in both asymmetric induction (up to 97% ee) and regioselection (O/N = >99/1), affording aminooxy ketone 3. The product 3 can be transformed to alpha-hydroxy ketone 5 without any loss of enantioselectivity. Thus, the method provides an efficient approach to the catalytic enantioselective introduction of oxygen alpha- to the carbonyl group.
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Affiliation(s)
- Norie Momiyama
- Department of Chemistry, University of Chicago, 5735 South Ellis Avenue, Illinois 60637, USA
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20
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Ramesh NG, Bakkeren FJ, Groot DD, Passamonti U, Klunder AJ, Zwanenburg B. Asymmetric desymmetrization of pseudo-meso 5-hydroxy-endo-tricyclo[5.2.1.02,6]deca-4,8-dien-3-ones. Tetrahedron 2001. [DOI: 10.1016/s0040-4020(01)01007-9] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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21
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Löwe W, Brätter SA, Weber M, Luger P, Buddrus J. The chemistry of the highly reactive 2,6-bis(bromomethyl)-4-pyrone. J Heterocycl Chem 2001. [DOI: 10.1002/jhet.5570380208] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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22
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Clerici A, Pastori N, Porta O. Mild acetalisation of mono and dicarbonyl compounds catalysed by titanium tetrachloride. Facile synthesis of β-keto enol ethers. Tetrahedron 2001. [DOI: 10.1016/s0040-4020(00)01001-2] [Citation(s) in RCA: 63] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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23
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Davis FA, Liu H, Chen BC, Zhou P. Oxidation of 1,3-dicarbonyl compounds using (camphorylsulfonyl)oxaziridines. Tetrahedron 1998. [DOI: 10.1016/s0040-4020(98)00500-6] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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24
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Zhu J, Yang JY, Klunder AJ, Liu ZY, Zwanenburg B. A stereo- and enantioselective approach to clavulones from tricyclodecadienone using flash vacuum thermolysis. Tetrahedron 1995. [DOI: 10.1016/0040-4020(95)00237-3] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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25
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Zhu J, Klunder AJ, Zwanenburg B. Synthesis of 6-functionalized tricyclodecadienones using Barton's radical decarboxylation reaction. Generation of tricyclo[5.2.1.02,6]decatrienone, a norbornene annulated cyclopentadienone. Tetrahedron 1995. [DOI: 10.1016/0040-4020(95)98707-o] [Citation(s) in RCA: 24] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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26
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Zhu J, Klunder AJ, Zwanenburg B. Stereospecific total synthesis of (−)-kjellmanianone and a revision of its absolute configuration. Tetrahedron Lett 1994. [DOI: 10.1016/s0040-4039(00)77033-x] [Citation(s) in RCA: 42] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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27
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Total synthesis of (−)-kjellmanianone from tricyclodecadienone. A revision of its absolute configuration. Tetrahedron 1994. [DOI: 10.1016/s0040-4020(01)89599-5] [Citation(s) in RCA: 25] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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28
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P M.A. Dols P, J.H. Klunder A, Zwanenburg B. 4-hydroxycyclopent-2-en-1-one and derivatives as chiral synthetic equivalents of cyclopentadienone in asymmetric diels-alder reactions. Tetrahedron 1994. [DOI: 10.1016/s0040-4020(01)85571-x] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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29
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Dols PP, Verstappen MM, Klunder AJ, Zwanenburg B. Regio- and stereoselectivity of additions of organometallics to - and -tricyclo[5.2.1.02,6]deca-4,8-dien-3-ones. Tetrahedron 1993. [DOI: 10.1016/s0040-4020(01)81817-2] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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30
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Asymmetric oxidation of β-ketoesters with benzoyl peroxide; enantioselective formation of protected tertiary alcohols. Tetrahedron Lett 1991. [DOI: 10.1016/s0040-4039(00)79421-4] [Citation(s) in RCA: 23] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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