1
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Affiliation(s)
- Takahiro Sawano
- Department of Chemistry and Biological Science; Aoyama Gakuin University; 5-10-1 Fuchinobe, Chuo-ku 252-5258 Sagamihara Kanagawa Japan
| | - Hisashi Yamamoto
- Molecular Catalyst Research Center; Chubu University; 1200, Matsumoto-cho Kasugai Aichi 487-8501 Japan
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2
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Chin KF, Ye X, Li Y, Lee R, Kabylda AM, Leow D, Zhang X, Xia Ang EC, Tan CH. Bisguanidinium-Catalyzed Epoxidation of Allylic and Homoallylic Amines under Phase Transfer Conditions. ACS Catal 2020. [DOI: 10.1021/acscatal.9b04862] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Affiliation(s)
- Kek Foo Chin
- Division of Chemistry and Biological Chemistry, Nanyang Technological University, 21 Nanyang Link, 637371, Singapore
| | - Xinyi Ye
- College of Pharmaceutical Science & Collaborative Innovation Center of Yangtze River Delta Region Green Pharmaceuticals, Zhejiang University of Technology, 18 Chaowang Road, Hangzhou 310014, P. R. China
| | - Yongxin Li
- Division of Chemistry and Biological Chemistry, Nanyang Technological University, 21 Nanyang Link, 637371, Singapore
| | - Richmond Lee
- Division of Science and Math, Singapore University of Technology and Design, 8 Somapah Road, 487372, Singapore
| | - Adil M. Kabylda
- Division of Chemistry and Biological Chemistry, Nanyang Technological University, 21 Nanyang Link, 637371, Singapore
| | - Dasheng Leow
- Division of Chemistry and Biological Chemistry, Nanyang Technological University, 21 Nanyang Link, 637371, Singapore
| | - Xin Zhang
- Division of Chemistry and Biological Chemistry, Nanyang Technological University, 21 Nanyang Link, 637371, Singapore
| | - Esther Cai Xia Ang
- Division of Chemistry and Biological Chemistry, Nanyang Technological University, 21 Nanyang Link, 637371, Singapore
| | - Choon-Hong Tan
- Division of Chemistry and Biological Chemistry, Nanyang Technological University, 21 Nanyang Link, 637371, Singapore
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3
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Ozsvár D, Nagy V, Zupkó I, Szakonyi Z. Stereoselective Synthesis and Antiproliferative Activity of Steviol-Based Diterpen Aminodiols. Int J Mol Sci 2019; 21:ijms21010184. [PMID: 31888049 PMCID: PMC6981646 DOI: 10.3390/ijms21010184] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2019] [Revised: 12/20/2019] [Accepted: 12/22/2019] [Indexed: 11/16/2022] Open
Abstract
A library of steviol-based trifunctional chiral ligands was developed from commercially available natural stevisoide and applied as chiral catalysts in the addition of diethylzinc to benzaldehyde. The key intermediate steviol methyl ester was prepared according to literature procedure. Depending on the epoxidation process, both cis- and trans-epoxyalcohols were obtained. Subsequent oxirane ring opening with primary and secondary amines afforded 3-amino-1,2-diols. The ring opening with sodium azide followed by a “click” reaction with alkynes resulted in dihydroxytriazoles. The regioselective ring closure of N-substituted aminodiols with formaldehyde was also investigated. The resulting steviol-type aminodiols were tested against a panel of human adherent cancer cell lines (A2780, SiHa, HeLa, and MDA-MB-231). It was consistently found that the N-benzyl substituent is an essential part within the molecule and the ring closure towards N-benzyl substituted oxazolidine ring system increased the antiproliferative activity to a level comparable with that of cisplatine. In addition, structure–activity relationships were examined by assessing substituent effects on the aminodiol systems.
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Affiliation(s)
- Dániel Ozsvár
- Institute of Pharmaceutical Chemistry, University of Szeged, Interdisciplinary Excellent Center, H-6720 Szeged, Hungary;
| | - Viktória Nagy
- Department of Pharmacodynamics and Biopharmacy, University of Szeged, H-6720 Szeged, Hungary; (V.N.); (I.Z.)
| | - István Zupkó
- Department of Pharmacodynamics and Biopharmacy, University of Szeged, H-6720 Szeged, Hungary; (V.N.); (I.Z.)
- Interdisciplinary Centre of Natural Products, University of Szeged, H-6720 Szeged, Hungary
| | - Zsolt Szakonyi
- Institute of Pharmaceutical Chemistry, University of Szeged, Interdisciplinary Excellent Center, H-6720 Szeged, Hungary;
- Interdisciplinary Centre of Natural Products, University of Szeged, H-6720 Szeged, Hungary
- Correspondence: ; Tel.: +36-62-546809; Fax: +36-62-545705
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4
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Nobuta T, Kawabata T. Catalyst-controlled site-selective asymmetric epoxidation of nerylamine and geranylamine derivatives. Chem Commun (Camb) 2017; 53:9320-9323. [PMID: 28771263 DOI: 10.1039/c7cc04809b] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
Novel catalysts for site- and enantioselective epoxidation of nerylamine and geranylamine derivatives have been developed. Although mCPBA oxidation took place selectively at the more electron-rich double bond to give the 6,7-epoxides, these catalysts provide the 2,3-epoxides in moderate to high enantioselectivity via the oxidation of the relatively electron-deficient double bond.
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Affiliation(s)
- Tomoya Nobuta
- Research Foundation Itsuu Laboratory, C1232, Kanagawa Science Park R&D Building, 3-2-1 Sakado, Takatsu-ku, Kawasaki, Kanagawa, 213-0012, Japan
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5
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Ji N, Yuan J, Liu M, Lan T, He W. Novel chiral Schiff base/Ti(iv) catalysts for the catalytic asymmetric epoxidation of N-alkenyl sulfonamides. Chem Commun (Camb) 2016; 52:7731-4. [DOI: 10.1039/c6cc02852g] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A novel highly enantioselective Schiff base/Ti(iv) catalyst for the catalytic asymmetric epoxidation of a series of N-alkenyl sulfonamides under mild conditions was described.
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Affiliation(s)
- Nan Ji
- Department of Chemistry
- School of Pharmacy
- Fourth Military Medical University
- Xi'an 710032
- P. R. China
| | - Jiani Yuan
- Department of Chemistry
- School of Pharmacy
- Fourth Military Medical University
- Xi'an 710032
- P. R. China
| | - Miaoxi Liu
- Department of Chemistry
- School of Pharmacy
- Fourth Military Medical University
- Xi'an 710032
- P. R. China
| | - Ting Lan
- Department of Chemistry
- School of Pharmacy
- Fourth Military Medical University
- Xi'an 710032
- P. R. China
| | - Wei He
- Department of Chemistry
- School of Pharmacy
- Fourth Military Medical University
- Xi'an 710032
- P. R. China
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6
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Ponra S, Majumdar KC. Brønsted acid-promoted synthesis of common heterocycles and related bio-active and functional molecules. RSC Adv 2016. [DOI: 10.1039/c5ra27069c] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022] Open
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7
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Davies SG, Fletcher AM, Thomson JE. Hydrogen bond directed epoxidation: diastereoselective olefinic oxidation of allylic alcohols and amines. Org Biomol Chem 2015; 12:4544-9. [PMID: 24854106 DOI: 10.1039/c4ob00616j] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
This article compares the diastereoselective epoxidation of acyclic and cyclic allylic alcohols, with the chemo- and diastereoselective olefinic oxidation of a range of acyclic and cyclic allylic amines. The diastereoselectivity in these systems is compared and a discussion about the origin of this high diastereocontrol is also presented. The ammonium directed epoxidation methodology has been extended to more complex substrates and representative applications of this protocol in natural product synthesis are also summarised.
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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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Chen S, Mercado BQ, Bergman RG, Ellman JA. Regio- and Diastereoselective Synthesis of Highly Substituted, Oxygenated Piperidines from Tetrahydropyridines. J Org Chem 2015; 80:6660-8. [PMID: 26098485 PMCID: PMC4496584 DOI: 10.1021/acs.joc.5b00816] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Diastereoselective epoxidation and regioselective ring-opening methods were developed for the synthesis of densely substituted, oxygenated piperidines from two classes of tetrahydropyridines with distinct stereochemical displays of functionalities. A new and practical in situ prepared epoxidation reagent was developed for the diastereoselective epoxidation of one class of sterically hindered tetrahydropyridines. The novel bifunctional epoxidation reagent, 2-carboperoxy-3,4,5,6-tetrafluorobenzoic acid, was designed to incorporate highly reactive percarboxy acid and pendant carboxylic acid groups, which through hydrogen bonding to the amino group successfully overrode steric effects and directed epoxidation to occur at the more hindered face of the tetrahydropyridine. Nucleophilic ring-opening of the epoxides with water, alcohols, and HF proceeded with high regioselectivity, affording piperidinol products with adjacent tetrasubstituted carbons.
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Affiliation(s)
- Shuming Chen
- Department of Chemistry, Yale University, 225 Prospect St., New Haven, CT 06520 (USA)
| | - Brandon Q. Mercado
- Department of Chemistry, Yale University, 225 Prospect St., New Haven, CT 06520 (USA)
| | - Robert G. Bergman
- Department of Chemistry, University of California, Berkeley Berkeley, CA 94720-1416 (USA) and Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, CA 94720 (USA)
| | - Jonathan A. Ellman
- Department of Chemistry, Yale University, 225 Prospect St., New Haven, CT 06520 (USA)
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9
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Brennan MB, Csatayová K, Davies SG, Fletcher AM, Green WD, Lee JA, Roberts PM, Russell AJ, Thomson JE. Syntheses of Dihydroconduramines (±)-B-1, (±)-E-1, and (±)-F-1 via Diastereoselective Epoxidation of N-Protected 4-Aminocyclohex-2-en-1-ols. J Org Chem 2015; 80:6609-18. [DOI: 10.1021/acs.joc.5b00716] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Méabh B. Brennan
- Department of Chemistry,
Chemistry Research Laboratory, University of Oxford, Mansfield
Road, Oxford OX1 3TA, United Kingdom
| | - Kristína Csatayová
- Department of Chemistry,
Chemistry Research Laboratory, University of Oxford, Mansfield
Road, Oxford OX1 3TA, United Kingdom
| | - Stephen G. Davies
- Department of Chemistry,
Chemistry Research Laboratory, University of Oxford, Mansfield
Road, Oxford OX1 3TA, United Kingdom
| | - Ai M. Fletcher
- Department of Chemistry,
Chemistry Research Laboratory, University of Oxford, Mansfield
Road, Oxford OX1 3TA, United Kingdom
| | - William D. Green
- Department of Chemistry,
Chemistry Research Laboratory, University of Oxford, Mansfield
Road, Oxford OX1 3TA, United Kingdom
| | - James A. Lee
- Department of Chemistry,
Chemistry Research Laboratory, University of Oxford, Mansfield
Road, Oxford OX1 3TA, United Kingdom
| | - Paul M. Roberts
- Department of Chemistry,
Chemistry Research Laboratory, University of Oxford, Mansfield
Road, Oxford OX1 3TA, United Kingdom
| | - Angela J. Russell
- Department of Chemistry,
Chemistry Research Laboratory, University of Oxford, Mansfield
Road, Oxford OX1 3TA, United Kingdom
| | - James E. Thomson
- Department of Chemistry,
Chemistry Research Laboratory, University of Oxford, Mansfield
Road, Oxford OX1 3TA, United Kingdom
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10
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Brennan MB, Davies SG, Fletcher AM, Lee JA, Roberts PM, Russell AJ, Thomson JE. Epoxidation of trans-4-Aminocyclohex-2-en-1-ol Derivatives: Competition of Hydroxy-Directed and Ammonium-Directed Pathways. Aust J Chem 2015. [DOI: 10.1071/ch14531] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
N-Substituted trans-4-aminocyclohex-2-en-1-ols undergo epoxidation upon treatment with Cl3CCO2H followed by meta-chloroperbenzoic acid (m-CPBA) via competitive pathways resulting from hydrogen-bonding delivery by both the hydroxy group and the in situ formed ammonium ion. The absence of epoxide ring-opening in these reactions renders these substrates a unique platform for analysing the effect of the two competing directing groups on the rate of the epoxidation reaction: the diastereoisomeric ratio of the epoxide products is also the ratio of the rate constants describing the competing epoxidation processes (the group with the higher directing ability dominating the stereochemical course of the reaction). Analysis of the diastereoisomeric epoxide mixtures obtained from these reactions allowed the following order of directing group ability to be defined: NHBn >> NMeBn > OH > NBn2. The large difference in rate between the secondary and tertiary amino groups is consistent with superior directing ability of the former due to the presence of two hydrogen-bond donor sites on the secondary ammonium ion and/or an increased conformational flexibility to adopt an optimum geometry. The rate of an ammonium-directed epoxidation proceeds ~10 times slower in the presence of an allylic hydroxy group than in its absence, consistent with the presence of the additional, inductively electron-withdrawing heteroatom abating the nucleophilicity of the olefin. The relative rate of the hydroxy-directed epoxidation process in the presence of a more sterically demanding ammonium substituent is greater than that in the presence of a less sterically demanding one: this effect is attributed to an increased bias for the half-chair conformer in which the bulky ammonium substituent and, hence, the hydroxy group occupy pseudo-equatorial sites, thus allowing the latter to direct the reaction more efficiently.
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11
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Kolb A, Zuo W, Siewert J, Harms K, von Zezschwitz P. Improved Synthesis of Cyclic Tertiary Allylic Alcohols by Asymmetric 1,2-Addition of AlMe3to Enones. Chemistry 2013; 19:16366-73. [DOI: 10.1002/chem.201303061] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2013] [Indexed: 11/09/2022]
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12
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Moriyama K, Izumisawa Y, Togo H. Brønsted Acid-assisted Intramolecular Aminohydroxylation of N-Alkenylsulfonamides under Heavy Metal-free Conditions. J Org Chem 2012; 77:9846-51. [DOI: 10.1021/jo301523a] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Affiliation(s)
- Katsuhiko Moriyama
- Department
of Chemistry, Graduate School of Science, Chiba University, Yayoi-cho 1-33, Inage-ku, Chiba 263-8522,
Japan
| | - Yuta Izumisawa
- Department
of Chemistry, Graduate School of Science, Chiba University, Yayoi-cho 1-33, Inage-ku, Chiba 263-8522,
Japan
| | - Hideo Togo
- Department
of Chemistry, Graduate School of Science, Chiba University, Yayoi-cho 1-33, Inage-ku, Chiba 263-8522,
Japan
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13
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Cresswell AJ, Davies SG, Lee JA, Morris MJ, Roberts PM, Thomson JE. Diastereodivergent Hydroxyfluorination of Cyclic and Acyclic Allylic Amines: Synthesis of 4-Deoxy-4-fluorophytosphingosines. J Org Chem 2012; 77:7262-81. [DOI: 10.1021/jo301056r] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Affiliation(s)
- Alexander J. Cresswell
- Department of Chemistry, Chemistry Research Laboratory, University of Oxford, Mansfield Road, Oxford OX1 3TA,
U.K
| | - Stephen G. Davies
- Department of Chemistry, Chemistry Research Laboratory, University of Oxford, Mansfield Road, Oxford OX1 3TA,
U.K
| | - James A. Lee
- Department of Chemistry, Chemistry Research Laboratory, University of Oxford, Mansfield Road, Oxford OX1 3TA,
U.K
| | - Melloney J. Morris
- Syngenta, Jealott’s Hill International Research Centre, Bracknell,
Berkshire RG42 6EY, U.K
| | - Paul M. Roberts
- Department of Chemistry, Chemistry Research Laboratory, University of Oxford, Mansfield Road, Oxford OX1 3TA,
U.K
| | - James E. Thomson
- Department of Chemistry, Chemistry Research Laboratory, University of Oxford, Mansfield Road, Oxford OX1 3TA,
U.K
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14
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Brennan MB, Claridge TDW, Compton RG, Davies SG, Fletcher AM, Henstridge MC, Hewings DS, Kurosawa W, Lee JA, Roberts PM, Schoonen AK, Thomson JE. Ammonium-directed olefinic epoxidation: kinetic and mechanistic insights. J Org Chem 2012; 77:7241-61. [PMID: 22827448 DOI: 10.1021/jo3010556] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The ammonium-directed olefinic epoxidations of a range of differentially N-substituted cyclic allylic and homoallylic amines (derived from cyclopentene, cyclohexene, and cycloheptene) have been investigated, and the reaction kinetics have been analyzed. The results of these studies suggest that both the ring size and the identity of the substituents on nitrogen are important in determining both the overall rate and the stereochemical outcome of the epoxidation reaction. In general, secondary amines or tertiary amines with nonsterically demanding substituents on nitrogen are superior to tertiary amines with sterically demanding substituents on nitrogen in their ability to promote the oxidation reaction. Furthermore, in all cases examined, the ability of the (in situ formed) ammonium substituent to direct the stereochemical course of the epoxidation reaction is either comparable or superior to that of the analogous hydroxyl substituent. Much slower rates of ring-opening of the intermediate epoxides are observed in cyclopentene-derived and cycloheptene-derived allylic amines as compared with their cyclohexene-derived allylic and homoallylic amine counterparts, allowing for isolation of these intermediates in both of the former cases.
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Affiliation(s)
- Méabh B Brennan
- Department of Chemistry, Chemistry Research Laboratory, University of Oxford, Mansfield Road, Oxford OX1 3TA, UK
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15
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Olivares-Romero JL, Li Z, Yamamoto H. Hf(IV)-catalyzed enantioselective epoxidation of N-alkenyl sulfonamides and N-tosyl imines. J Am Chem Soc 2012; 134:5440-3. [PMID: 22420598 DOI: 10.1021/ja211880s] [Citation(s) in RCA: 65] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Asymmetric epoxidation of allylic and homoallylic amine derivatives catalyzed by Hf(IV)-bishydroxamic acid complexes is described. Under similar conditions, aldimine and ketimine produced oxaziridines. The sulfonyl group is demonstrated to be an effective directing group for these transformations.
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Pace V, Castoldi L, Hoyos P, Sinisterra JV, Pregnolato M, Sánchez-Montero JM. Highly regioselective control of 1,2-addition of organolithiums to α,β-unsaturated compounds promoted by lithium bromide in 2-methyltetrahydrofuran: a facile and eco-friendly access to allylic alcohols and amines. Tetrahedron 2011. [DOI: 10.1016/j.tet.2011.01.067] [Citation(s) in RCA: 50] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
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17
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Eor S, Hwang J, Choi MG, Chang SK. Fluorescent Signaling of Oxone by Desulfurization of Thioamide. Org Lett 2010; 13:370-3. [DOI: 10.1021/ol102550c] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Suyoung Eor
- Department of Chemistry, Chung-Ang University, Seoul 156-756, Korea
| | - Jiyoung Hwang
- Department of Chemistry, Chung-Ang University, Seoul 156-756, Korea
| | - Myung Gil Choi
- Department of Chemistry, Chung-Ang University, Seoul 156-756, Korea
| | - Suk-Kyu Chang
- Department of Chemistry, Chung-Ang University, Seoul 156-756, Korea
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18
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Aciro C, Claridge TDW, Davies SG, Roberts PM, Russell AJ, Thomson JE. Ammonium-directed dihydroxylation of 3-aminocyclohex-1-enes: development of a metal-free dihydroxylation protocol. Org Biomol Chem 2008; 6:3751-61. [PMID: 18843405 DOI: 10.1039/b808811j] [Citation(s) in RCA: 51] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Treatment of 3-aminocyclohex-1-enes with mCPBA in the presence of trichloroacetic acid gives the corresponding 1,2-anti-2,3-syn-1-trichloroacetoxy-2-hydroxy-3-aminocyclohexane with high levels of diastereoselectivity (90% de). This is consistent with a mechanism of oxidation involving hydrogen-bonded delivery of the oxidant by the allylic ammonium ion formed in situ, followed by highly regioselective ring-opening of the intermediate epoxide by trichloroacetic acid. The effect of conformational constraints upon the oxidation reaction is also examined.
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Affiliation(s)
- Caroline Aciro
- Department of Chemistry, Chemistry Research Laboratory, University of Oxford, Mansfield Road, Oxford, OX1 3TA, UK
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19
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Cagnoli R, Lanzi M, Libertini E, Mucci A, Paganin L, Parenti F, Preti L, Schenetti L. Organic- and Water-Soluble Aminoalkylsulfanyl Polythiophenes. Macromolecules 2008. [DOI: 10.1021/ma800221v] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Rita Cagnoli
- Dipartimento di Chimica, Università di Modena e Reggio Emilia, via G. Campi 183, 41100 Modena, Italy, and Dipartimento di Chimica Industriale e dei Materiali, Università di Bologna, viale Risorgimento 4, 40136 Bologna, Italy
| | - Massimiliano Lanzi
- Dipartimento di Chimica, Università di Modena e Reggio Emilia, via G. Campi 183, 41100 Modena, Italy, and Dipartimento di Chimica Industriale e dei Materiali, Università di Bologna, viale Risorgimento 4, 40136 Bologna, Italy
| | - Emanuela Libertini
- Dipartimento di Chimica, Università di Modena e Reggio Emilia, via G. Campi 183, 41100 Modena, Italy, and Dipartimento di Chimica Industriale e dei Materiali, Università di Bologna, viale Risorgimento 4, 40136 Bologna, Italy
| | - Adele Mucci
- Dipartimento di Chimica, Università di Modena e Reggio Emilia, via G. Campi 183, 41100 Modena, Italy, and Dipartimento di Chimica Industriale e dei Materiali, Università di Bologna, viale Risorgimento 4, 40136 Bologna, Italy
| | - Luisa Paganin
- Dipartimento di Chimica, Università di Modena e Reggio Emilia, via G. Campi 183, 41100 Modena, Italy, and Dipartimento di Chimica Industriale e dei Materiali, Università di Bologna, viale Risorgimento 4, 40136 Bologna, Italy
| | - Francesca Parenti
- Dipartimento di Chimica, Università di Modena e Reggio Emilia, via G. Campi 183, 41100 Modena, Italy, and Dipartimento di Chimica Industriale e dei Materiali, Università di Bologna, viale Risorgimento 4, 40136 Bologna, Italy
| | - Lisa Preti
- Dipartimento di Chimica, Università di Modena e Reggio Emilia, via G. Campi 183, 41100 Modena, Italy, and Dipartimento di Chimica Industriale e dei Materiali, Università di Bologna, viale Risorgimento 4, 40136 Bologna, Italy
| | - Luisa Schenetti
- Dipartimento di Chimica, Università di Modena e Reggio Emilia, via G. Campi 183, 41100 Modena, Italy, and Dipartimento di Chimica Industriale e dei Materiali, Università di Bologna, viale Risorgimento 4, 40136 Bologna, Italy
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20
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Aciro C, Davies SG, Roberts PM, Russell AJ, Smith AD, Thomson JE. Ammonium-directed dihydroxylation: metal-free synthesis of the diastereoisomers of 3-aminocyclohexane-1,2-diol. Org Biomol Chem 2008; 6:3762-70. [DOI: 10.1039/b808812h] [Citation(s) in RCA: 46] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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21
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Kotsuki H, Ikishima H, Okuyama A. Organocatalytic Asymmetric Synthesis Using Proline and Related Molecules. Part 2. HETEROCYCLES 2008. [DOI: 10.3987/rev-07-621] [Citation(s) in RCA: 87] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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22
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Enantioselective olefin epoxidation using novel biphenyl and binaphthyl azepines and azepinium salts. ACTA ACUST UNITED AC 2006. [DOI: 10.1016/j.tetasy.2006.08.018] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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23
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Gonçalves MH, Martinez A, Grass S, Page PCB, Lacour J. Enantioselective olefin epoxidation using homologous amine and iminium catalysts—a direct comparison. Tetrahedron Lett 2006. [DOI: 10.1016/j.tetlet.2006.05.132] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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24
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Lattanzi A. Bis(3,5-dimethylphenyl)-(S)-pyrrolidin-2-ylmethanol: an Improved Organocatalyst for the Asymmetric Epoxidation of α,β-Enones. Adv Synth Catal 2006. [DOI: 10.1002/adsc.200505370] [Citation(s) in RCA: 70] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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