1
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Zhang MZ, Wang P, Liu HY, Wang D, Deng Y, Bai YH, Luo F, Wu WY, Chen T. Metal-Catalyst-Free One-Pot Aqueous Synthesis of trans-1,2-Diols from Electron-Deficient α,β-Unsaturated Amides via Epoxidation Using Oxone as a Dual Role Reagent. CHEMSUSCHEM 2023; 16:e202300583. [PMID: 37311715 DOI: 10.1002/cssc.202300583] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/24/2023] [Revised: 06/05/2023] [Accepted: 06/13/2023] [Indexed: 06/15/2023]
Abstract
In organic synthesis, incorporating two functional groups into the carbon-carbon double bond of α,β-unsaturated amides is challenging due to the electron-deficient nature of the olefin moiety. Although a few examples of dihydroxylation of α,β-unsaturated amides have been demonstrated, producing cis-1,2-diols using either highly toxic OsO4 or other specialized metal reagents in organic solvents, they are limited to several specific amides. We describe herein a general and one-pot direct synthesis of trans-1,2-diols from electron-deficient α,β-unsaturated amides through dihydroxylation using oxone as a dual-role reagent in water. This reaction does not require any metal catalyst and produces non-hazardous and nontoxic K2 SO4 as the sole byproduct. Moreover, epoxidation products could also be selectively formed by adjusting the reaction conditions. By the strategy, the intermediates of Mcl-1 inhibitor and antiallergic bioactive molecule can be synthesized in one pot. The gram-scale synthesis of trans-1,2-diol which is isolated and purified by recrystallization further shows the potential applications of this new reaction in organic synthesis.
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Affiliation(s)
- Ming-Zhong Zhang
- College of Chemistry and Chemical Engineering, Yangtze Normal University, Chongqing, 408100, China
| | - Ping Wang
- College of Chemistry and Chemical Engineering, Yangtze Normal University, Chongqing, 408100, China
| | - Hai-Yan Liu
- College of Chemistry and Chemical Engineering, Yangtze Normal University, Chongqing, 408100, China
| | - Dailian Wang
- College of Chemistry and Chemical Engineering, Ningxia Normal University, Guyuan, 756000, China
| | - Ya Deng
- College of Chemistry and Chemical Engineering, Yangtze Normal University, Chongqing, 408100, China
| | - Yu-Heng Bai
- College of Chemistry and Chemical Engineering, Yangtze Normal University, Chongqing, 408100, China
| | - Fei Luo
- College of Chemistry and Chemical Engineering, Yangtze Normal University, Chongqing, 408100, China
| | - Wen-Yu Wu
- College of Chemistry and Chemical Engineering, Yangtze Normal University, Chongqing, 408100, China
| | - Tieqiao Chen
- College of Chemical Engineering and Technology, Hainan University, Haikou, 410082, China
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2
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Ghosh D, Molla SA, Ghosh NN, Khamarui S, Maiti DK. Cu II-Catalyzed cis-Selective Synthesis of Ketoepoxides from Phenacyl Bromides and Water. J Org Chem 2023. [PMID: 37379249 DOI: 10.1021/acs.joc.2c02835] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/30/2023]
Abstract
A verity of α,β-ketoepoxides was synthesized using a CuII-catalyzed oxidative C-C/O-C coupled cyclization strategy with high yield and cis-selectivity. Water is used as the source of oxygen and phenacyl bromide as the carbon in the valuable epoxides. The self-coupling method was extended to cross-coupling between phenacyl bromides with benzyl bromides. A high cis-diastereoselectivity was observed in all the synthesized ketoepoxides. Control experiments and density functional theory (DFT) study were performed to understand the CuII-CuI transition mechanism.
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Affiliation(s)
- Debasish Ghosh
- Department of Chemistry, University of Calcutta, 92, A. P. C. Road, Kolkata 700009, India
| | - Sabir A Molla
- Department of Chemistry, University of Calcutta, 92, A. P. C. Road, Kolkata 700009, India
| | | | - Saikat Khamarui
- Department of Chemistry, Government General Degree College, Kalna-1, Burdwan 713405, India
| | - Dilip K Maiti
- Department of Chemistry, University of Calcutta, 92, A. P. C. Road, Kolkata 700009, India
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3
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Horwitz MA, Dürr AB, Afratis K, Chen Z, Soika J, Christensen KE, Fushimi M, Paton RS, Gouverneur V. Regiodivergent Nucleophilic Fluorination under Hydrogen Bonding Catalysis: A Computational and Experimental Study. J Am Chem Soc 2023; 145:9708-9717. [PMID: 37079853 PMCID: PMC10161234 DOI: 10.1021/jacs.3c01303] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/22/2023]
Abstract
The controlled programming of regiochemical outcomes in nucleophilic fluorination reactions with alkali metal fluoride is a problem yet to be solved. Herein, two synergistic approaches exploiting hydrogen bonding catalysis are presented. First, we demonstrate that modulating the charge density of fluoride with a hydrogen-bond donor urea catalyst directly influences the kinetic regioselectivity in the fluorination of dissymmetric aziridinium salts with aryl and ester substituents. Moreover, we report a urea-catalyzed formal dyotropic rearrangement, a thermodynamically controlled regiochemical editing process consisting of C-F bond scission followed by fluoride rebound. These findings offer a route to access enantioenriched fluoroamine regioisomers from a single chloroamine precursor, and more generally, new opportunities in regiodivergent asymmetric (bis)urea-based organocatalysis.
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Affiliation(s)
- Matthew A Horwitz
- Chemistry Research Laboratory, University of Oxford, 12 Mansfield Road, Oxford OX1 3TA, U.K
| | - Alexander B Dürr
- Chemistry Research Laboratory, University of Oxford, 12 Mansfield Road, Oxford OX1 3TA, U.K
| | - Konstantinos Afratis
- Chemistry Research Laboratory, University of Oxford, 12 Mansfield Road, Oxford OX1 3TA, U.K
| | - Zijun Chen
- Chemistry Research Laboratory, University of Oxford, 12 Mansfield Road, Oxford OX1 3TA, U.K
| | - Julia Soika
- Chemistry Research Laboratory, University of Oxford, 12 Mansfield Road, Oxford OX1 3TA, U.K
| | - Kirsten E Christensen
- Chemistry Research Laboratory, University of Oxford, 12 Mansfield Road, Oxford OX1 3TA, U.K
| | - Makoto Fushimi
- Takeda Pharmaceutical Company Limited, 26-1, Muraoka-Higashi 2-Chome, Fujisawa, Kanagawa 251-8555, Japan
| | - Robert S Paton
- Department of Chemistry, Colorado State University, Fort Collins, Colorado 80528, United States
| | - Véronique Gouverneur
- Chemistry Research Laboratory, University of Oxford, 12 Mansfield Road, Oxford OX1 3TA, U.K
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4
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Zhang G, Cramer N. Reductive Asymmetric Aza-Mislow-Evans Rearrangement by 1,3,2-Diazaphospholene Catalysis. Angew Chem Int Ed Engl 2023; 62:e202301076. [PMID: 36820495 DOI: 10.1002/anie.202301076] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2023] [Revised: 02/21/2023] [Accepted: 02/23/2023] [Indexed: 02/24/2023]
Abstract
1,3,2-diazaphospholene hydrides (DAP-H) enable smooth conjugate reduction of polarized double bonds. The transiently formed phosphorus-enolate provides a potential platform for reductive α-functionalizations. In this respect, asymmetric C-heteroatom bond forming processes are synthetically appealing but remain elusive. We report a 1,3,2-diazaphospholene-catalyzed three-step cascade reaction of N-sulfinyl acrylamides comprised of conjugate reduction, [2,3]-sigmatropic aza-Mislow-Evans rearrangement and subsequent S-O bond cleavage. The obtained enantio-enriched α-hydroxy amides are formed in good yields and excellent enantiospecificity. The stereo-defined P-bound N,O-ketene aminal ensures an excellent transfer of chirality from the sulfur stereocenter to α-carbon. The transformation operates under mild conditions at ambient temperature. Moreover, DAP-H is a competent reductant for the cleavage of formed sulfenate ester, eliminating the extra step in traditional Mislow-Evans processes.
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Affiliation(s)
- Guoting Zhang
- Institute of Chemical Sciences and Engineering (ISIC), EPFL SB ISIC LCSA, BCH 4305, 1015, Lausanne, Switzerland
| | - Nicolai Cramer
- Institute of Chemical Sciences and Engineering (ISIC), EPFL SB ISIC LCSA, BCH 4305, 1015, Lausanne, Switzerland
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5
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Gao TT, Lu HX, Gao PC, Li BJ. Enantioselective synthesis of tertiary boronic esters through catalytic asymmetric reversed hydroboration. Nat Commun 2021; 12:3776. [PMID: 34145273 PMCID: PMC8213697 DOI: 10.1038/s41467-021-24012-z] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2021] [Accepted: 05/28/2021] [Indexed: 11/09/2022] Open
Abstract
Chiral tertiary boronic esters are important precursors to bioactive compounds and versatile synthetic intermediates to molecules containing quaternary stereocenters. The development of conjugate boryl addition to α,β-unsaturated amide has been hampered by the intrinsic low electrophilicity of the amide group. Here we show the catalytic asymmetric synthesis of enantioenriched tertiary boronic esters through hydroboration of β,β-disubstituted α,β-unsaturated amides. The Rh-catalyzed hydroboration occurs with previously unattainable selectivity to provide tertiary boronic esters in high enantioselectivity. This strategy opens a door for the hydroboration of inert Michael acceptors with high stereocontrol and may provide future applications in the synthesis of biologically active molecules.
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Affiliation(s)
- Tao-Tao Gao
- Center of Basic Molecular Science (CBMS), Department of Chemistry, Tsinghua University, Beijing, China
| | - Hou-Xiang Lu
- Center of Basic Molecular Science (CBMS), Department of Chemistry, Tsinghua University, Beijing, China
| | - Peng-Chao Gao
- Center of Basic Molecular Science (CBMS), Department of Chemistry, Tsinghua University, Beijing, China
| | - Bi-Jie Li
- Center of Basic Molecular Science (CBMS), Department of Chemistry, Tsinghua University, Beijing, China.
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6
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Ottenbacher RV, Kurganskiy VI, Talsi EP, Bryliakov KP. Manganese Catalyzed Enantioselective Epoxidation of
α
,
β
‐Unsaturated Amides with H
2
O
2. Adv Synth Catal 2021. [DOI: 10.1002/adsc.202100198] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Roman V. Ottenbacher
- Boreskov Institute of Catalysis Pr. Lavrentieva 5 Novosibirsk 630090 Russian Federation
| | | | - Evgenii P. Talsi
- Boreskov Institute of Catalysis Pr. Lavrentieva 5 Novosibirsk 630090 Russian Federation
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7
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Li YB, Tian H, Yin L. Copper(I)-Catalyzed Asymmetric 1,4-Conjugate Hydrophosphination of α,β-Unsaturated Amides. J Am Chem Soc 2020; 142:20098-20106. [DOI: 10.1021/jacs.0c09654] [Citation(s) in RCA: 46] [Impact Index Per Article: 11.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Affiliation(s)
- Yan-Bo Li
- CAS Key Laboratory of Synthetic Chemistry of Natural Substances, Centre for Excellence in Molecular Synthesis, Shanghai Institute of Organic Chemistry, University of Chinese Academy of Sciences, Chinese Academy of Sciences, 345 Lingling Road, Shanghai 200032, China
| | - Hu Tian
- CAS Key Laboratory of Synthetic Chemistry of Natural Substances, Centre for Excellence in Molecular Synthesis, Shanghai Institute of Organic Chemistry, University of Chinese Academy of Sciences, Chinese Academy of Sciences, 345 Lingling Road, Shanghai 200032, China
| | - Liang Yin
- CAS Key Laboratory of Synthetic Chemistry of Natural Substances, Centre for Excellence in Molecular Synthesis, Shanghai Institute of Organic Chemistry, University of Chinese Academy of Sciences, Chinese Academy of Sciences, 345 Lingling Road, Shanghai 200032, China
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8
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Hao F, Gu Z, Liu G, Yao W, Jiang H, Wu J. Catalyst- and Additive-Free Chemoselective Transfer Hydrogenation of α-Keto Amides to α-Hydroxy Amides by Sodium Formate. European J Org Chem 2019. [DOI: 10.1002/ejoc.201901073] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Affiliation(s)
- Feiyue Hao
- School of Pharmaceutical and Materials Engineering; Taizhou University; 318000, Zhejiang Province Jiaojiang China
| | - Zhenyu Gu
- School of Pharmaceutical and Materials Engineering; Taizhou University; 318000, Zhejiang Province Jiaojiang China
| | - Guyue Liu
- School of Pharmaceutical and Materials Engineering; Taizhou University; 318000, Zhejiang Province Jiaojiang China
| | - Wubing Yao
- School of Pharmaceutical and Materials Engineering; Taizhou University; 318000, Zhejiang Province Jiaojiang China
| | - Huajiang Jiang
- School of Pharmaceutical and Materials Engineering; Taizhou University; 318000, Zhejiang Province Jiaojiang China
| | - Jiashou Wu
- School of Pharmaceutical and Materials Engineering; Taizhou University; 318000, Zhejiang Province Jiaojiang China
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9
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Clarasó C, Vicens L, Polo A, Costas M. Enantioselective Epoxidation of β,β-Disubstituted Enamides with a Manganese Catalyst and Aqueous Hydrogen Peroxide. Org Lett 2019; 21:2430-2435. [PMID: 30883137 DOI: 10.1021/acs.orglett.9b00729] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
Enantioselective epoxidation of β,β-disubstituted enamides with aqueous hydrogen peroxide and a novel manganese catalyst is described. Epoxidation is stereospecific and proceeds fast under mild conditions. Amides are disclosed as key functional groups to enable high enantioselectivity.
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Affiliation(s)
- Carlota Clarasó
- Department de Química , Universitat de Girona . Campus de Montilivi, E-17003 Girona , Catalonia , Spain.,Institut de Química Computacional i Catàlisi (IQCC) , Universitat de Girona , E-17003 Girona , Catalonia , Spain
| | - Laia Vicens
- Department de Química , Universitat de Girona . Campus de Montilivi, E-17003 Girona , Catalonia , Spain.,Institut de Química Computacional i Catàlisi (IQCC) , Universitat de Girona , E-17003 Girona , Catalonia , Spain
| | - Alfonso Polo
- Department de Química , Universitat de Girona . Campus de Montilivi, E-17003 Girona , Catalonia , Spain
| | - Miquel Costas
- Department de Química , Universitat de Girona . Campus de Montilivi, E-17003 Girona , Catalonia , Spain.,Institut de Química Computacional i Catàlisi (IQCC) , Universitat de Girona , E-17003 Girona , Catalonia , Spain
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10
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11
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Triandafillidi I, Tzaras DI, Kokotos CG. Green Organocatalytic Oxidative Methods using Activated Ketones. ChemCatChem 2018. [DOI: 10.1002/cctc.201800013] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Ierasia Triandafillidi
- Laboratory of Organic Chemistry; Department of Chemistry; National and Kapodistrian University of Athens, Panepistimiopolis; 15771 Athens Greece
| | - Dimitrios Ioannis Tzaras
- Laboratory of Organic Chemistry; Department of Chemistry; National and Kapodistrian University of Athens, Panepistimiopolis; 15771 Athens Greece
| | - Christoforos G. Kokotos
- Laboratory of Organic Chemistry; Department of Chemistry; National and Kapodistrian University of Athens, Panepistimiopolis; 15771 Athens Greece
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12
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Ashokkumar V, Siva A, Ramaswamy Chidambaram R. A highly enantioselective asymmetric Darzens reaction catalysed by proline based efficient organocatalysts for the synthesis of di- and tri-substituted epoxides. Chem Commun (Camb) 2018; 53:10926-10929. [PMID: 28930307 DOI: 10.1039/c7cc06194c] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A new class of easily available and readily tunable proline based chiral organocatalysts was found to efficiently catalyse an unprecedented highly enantioselective asymmetric Darzens reaction of α-chloroketones and substituted α-chloroketones with various aldehydes, which directly produces optically active di- and tri-substituted chiral epoxides with higher product yields (up to 97%) and excellent ee's (up to 99%) under mild reaction conditions.
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Affiliation(s)
- Veeramanoharan Ashokkumar
- Supramolecular and Organometallic Chemistry Lab, Department of Inorganic Chemistry, School of Chemistry, Madurai Kamaraj University, Madurai, Tamil Nadu-625 021, India.
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13
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Szőllősi G. Asymmetric one-pot reactions using heterogeneous chemical catalysis: recent steps towards sustainable processes. Catal Sci Technol 2018. [DOI: 10.1039/c7cy01671a] [Citation(s) in RCA: 59] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
Asymmetric one-pot reactions applying heterogeneous chemical catalysts and unifying the benefits of these catalytic materials with the advantages of one-pot methods, are surveyed.
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Affiliation(s)
- György Szőllősi
- MTA-SZTE Stereochemistry Research Group
- University of Szeged
- H-6720 Szeged, Dóm tér 8
- Hungary
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14
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Osorio-Nieto U, Vázquez-Amaya LY, Höpfl H, Quintero L, Sartillo-Piscil F. The direct and highly diastereoselective synthesis of 3,4-epoxy-2-piperidones. Application to the total synthesis and absolute configurational assignment of 3α,4α-epoxy-5β-pipermethystine. Org Biomol Chem 2018; 16:77-88. [DOI: 10.1039/c7ob02700a] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The substrate-controlled asymmetric total synthesis and absolute configurational assignment of biologically active 3α,4α-epoxy-5β-pipermethystine is reported.
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Affiliation(s)
- Urbano Osorio-Nieto
- Centro de Investigación de la Facultad de Ciencias Químicas
- Benemérita Universidad Autónoma de Puebla (BUAP)
- Puebla
- México
| | - Laura Y. Vázquez-Amaya
- Centro de Investigación de la Facultad de Ciencias Químicas
- Benemérita Universidad Autónoma de Puebla (BUAP)
- Puebla
- México
| | - Herbert Höpfl
- Centro de Investigaciones Químicas
- Instituto de Investigación en Ciencias Básicas y Aplicadas
- Universidad Autónoma del Estado de Morelos
- Cuernavaca
- México
| | - Leticia Quintero
- Centro de Investigación de la Facultad de Ciencias Químicas
- Benemérita Universidad Autónoma de Puebla (BUAP)
- Puebla
- México
| | - Fernando Sartillo-Piscil
- Centro de Investigación de la Facultad de Ciencias Químicas
- Benemérita Universidad Autónoma de Puebla (BUAP)
- Puebla
- México
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15
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Liu H, An Z, He J. Nanosheet-enhanced efficiency in amine-catalyzed asymmetric epoxidation of α, β-unsaturated aldehydes via host-guest synergy. MOLECULAR CATALYSIS 2017. [DOI: 10.1016/j.mcat.2017.09.035] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
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16
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Song H, Ye K, Geng P, Han X, Liao R, Tung CH, Wang W. Activation of Epoxides by a Cooperative Iron–Thiolate Catalyst: Intermediacy of Ferrous Alkoxides in Catalytic Hydroboration. ACS Catal 2017. [DOI: 10.1021/acscatal.7b02527] [Citation(s) in RCA: 41] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Heng Song
- School
of Chemistry and Chemical Engineering, Shandong University, 27 South Shanda Road, Jinan, 250100, China
| | - Ke Ye
- School
of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, 1037 Luoyu Road, Wuhan, 430074, China
| | - Peiyu Geng
- School
of Chemistry and Chemical Engineering, Shandong University, 27 South Shanda Road, Jinan, 250100, China
| | - Xiao Han
- School
of Chemistry and Chemical Engineering, Shandong University, 27 South Shanda Road, Jinan, 250100, China
| | - Rongzhen Liao
- School
of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, 1037 Luoyu Road, Wuhan, 430074, China
| | - Chen-Ho Tung
- School
of Chemistry and Chemical Engineering, Shandong University, 27 South Shanda Road, Jinan, 250100, China
| | - Wenguang Wang
- School
of Chemistry and Chemical Engineering, Shandong University, 27 South Shanda Road, Jinan, 250100, China
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17
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Chen X, Gao B, Su Y, Huang H. Enantioselective Epoxidation of Electron-Deficient Alkenes Catalyzed by Manganese Complexes with Chiral N4
Ligands Derived from Rigid Chiral Diamines. Adv Synth Catal 2017. [DOI: 10.1002/adsc.201700541] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Xiangning Chen
- State Key Laboratory for Oxo Synthesis and Selective Oxidation; Lanzhou Institute of Chemical Physics; Chinese Academy of Sciences; Lanzhou 730000 People's Republic of China
| | - Bao Gao
- Hefei National Laboratory for Physical Sciences at the Microscale; Department of Chemistry; University of Science and Technology of China; Hefei 230026 People's Republic of China
| | - Yijin Su
- State Key Laboratory for Oxo Synthesis and Selective Oxidation; Lanzhou Institute of Chemical Physics; Chinese Academy of Sciences; Lanzhou 730000 People's Republic of China
| | - Hanmin Huang
- State Key Laboratory for Oxo Synthesis and Selective Oxidation; Lanzhou Institute of Chemical Physics; Chinese Academy of Sciences; Lanzhou 730000 People's Republic of China
- Hefei National Laboratory for Physical Sciences at the Microscale; Department of Chemistry; University of Science and Technology of China; Hefei 230026 People's Republic of China
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18
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Lorion MM, Maindan K, Kapdi AR, Ackermann L. Heteromultimetallic catalysis for sustainable organic syntheses. Chem Soc Rev 2017; 46:7399-7420. [DOI: 10.1039/c6cs00787b] [Citation(s) in RCA: 113] [Impact Index Per Article: 16.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Fully complementary bimetallic catalysis has been identified as an increasingly powerful tool for molecular transformations, which was largely inspired by early examples of sequential catalytic transformations.
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Affiliation(s)
- Mélanie M. Lorion
- Institut fur Organische und Biomolekulare Chemie
- Georg-August-Universität
- 37077 Göttingen
- Germany
| | - Karan Maindan
- Department of Chemistry
- Institute of Chemical Technology
- Mumbai-400019
- India
| | - Anant R. Kapdi
- Department of Chemistry
- Institute of Chemical Technology
- Mumbai-400019
- India
| | - Lutz Ackermann
- Institut fur Organische und Biomolekulare Chemie
- Georg-August-Universität
- 37077 Göttingen
- Germany
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19
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Chenniappan VK, Rahaim RJ. Titanium-Promoted Cross-Coupling for the Selective Synthesis of Polysubstituted, Conjugated Amides. Org Lett 2016; 18:5090-5093. [PMID: 27678270 DOI: 10.1021/acs.orglett.6b02537] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
α,β-Unsaturated amides are important building blocks and are key structural elements in a number of biologically active natural products. Despite their importance and prevalence, few methods exist to prepare conjugated amides directly and modularly. To address this gap, a titanium-promoted coupling of alkynes and isocyanates has been developed. The method is highly stereoselective, producing only the E isomer with good chemoselectivity and regioselectivity (>95/5), for unsymmetrical internal alkynes that contain a steric bias. The reactive titanacyclopentene intermediate formed from the coupling of the alkyne and isocyanate was additionally reacted with various electrophiles to access tetrasubstituted enamides.
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Affiliation(s)
- Vinoth Kumar Chenniappan
- Department of Chemistry, Oklahoma State University , 107 Physical Sciences 1, Stillwater, Oklahoma 74078, United States
| | - Ronald J Rahaim
- Department of Chemistry, Oklahoma State University , 107 Physical Sciences 1, Stillwater, Oklahoma 74078, United States
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20
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Raheem Keeri A, Justyniak I, Jurczak J, Lewiński J. Quest for Efficient Catalysts based on Zinctert-Butyl Peroxides for Asymmetric Epoxidation of Enones:C2-vs C1-Symmetric Auxiliaries. Adv Synth Catal 2016. [DOI: 10.1002/adsc.201500764] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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21
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Desimoni G, Faita G, Quadrelli P. Enantioselective Catalytic Reactions with N-Acyliden Penta-atomic Aza-heterocycles. Heterocycles as Masked Bricks To Build Chiral Scaffolds. Chem Rev 2015; 115:9922-80. [DOI: 10.1021/acs.chemrev.5b00097] [Citation(s) in RCA: 53] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Giovanni Desimoni
- Department of Chemistry, University of Pavia, Viale Taramelli 10, 27100 Pavia, Italy
| | - Giuseppe Faita
- Department of Chemistry, University of Pavia, Viale Taramelli 10, 27100 Pavia, Italy
| | - Paolo Quadrelli
- Department of Chemistry, University of Pavia, Viale Taramelli 10, 27100 Pavia, Italy
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22
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Zeng C, Yuan D, Zhao B, Yao Y. Highly Enantioselective Epoxidation of α,β-Unsaturated Ketones Catalyzed by Rare-Earth Amides [(Me3Si)2N]3RE(μ-Cl)Li(THF)3 with Phenoxy-Functionalized Chiral Prolinols. Org Lett 2015; 17:2242-5. [DOI: 10.1021/acs.orglett.5b00833] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Affiliation(s)
- Chao Zeng
- Key
Laboratory of Organic Synthesis of Jiangsu Province, College of Chemistry,
Chemical Engineering and Materials Science, Dushu Lake
Campus, Soochow University, Suzhou 215123, People’s Republic of China
| | - Dan Yuan
- Key
Laboratory of Organic Synthesis of Jiangsu Province, College of Chemistry,
Chemical Engineering and Materials Science, Dushu Lake
Campus, Soochow University, Suzhou 215123, People’s Republic of China
| | - Bei Zhao
- Key
Laboratory of Organic Synthesis of Jiangsu Province, College of Chemistry,
Chemical Engineering and Materials Science, Dushu Lake
Campus, Soochow University, Suzhou 215123, People’s Republic of China
| | - Yingming Yao
- Key
Laboratory of Organic Synthesis of Jiangsu Province, College of Chemistry,
Chemical Engineering and Materials Science, Dushu Lake
Campus, Soochow University, Suzhou 215123, People’s Republic of China
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23
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Drouet F, Zhu J, Masson G. Iron Chloride‐Catalyzed Three‐Component Domino Sequences: Syntheses of Functionalized α‐Oxy‐N‐acylhemiaminals and α‐Oxyimides. Adv Synth Catal 2013. [DOI: 10.1002/adsc.201300847] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Fleur Drouet
- Centre de Recherche de Gif, Institut de Chimie des Substances Naturelles, CNRS, 91198 Gif‐sur‐Yvette Cedex, France, homepage: http://www.icsn.cnrs‐gif.fr/spip.php?article225
| | - Jieping Zhu
- Institute of Chemical Sciences and Engineering, Ecole Polytechnique Fédérale de Lausanne (EPFL), EPFL‐SB‐ISIC LSPN, CH‐1015 Lausanne, Switzerland
| | - Géraldine Masson
- Centre de Recherche de Gif, Institut de Chimie des Substances Naturelles, CNRS, 91198 Gif‐sur‐Yvette Cedex, France, homepage: http://www.icsn.cnrs‐gif.fr/spip.php?article225
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24
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Yan H, Yang H, Lu L, Liu D, Rong G, Mao J. Copper-catalyzed synthesis of α,β-unsaturated acylamides via direct amidation from cinnamic acids and N-substituted formamides. Tetrahedron 2013. [DOI: 10.1016/j.tet.2013.06.078] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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25
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Gordillo PG, Aparicio DM, Flores M, Mendoza A, Orea L, Juárez JR, Huelgas G, Gnecco D, Terán JL. Oxazolidine Sulfur Ylides Derived from Phenylglycinol for the Specific and Highly Diastereoselective Synthesis of Aryl and Alkyltrans-Epoxyamides. European J Org Chem 2013. [DOI: 10.1002/ejoc.201300732] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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26
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Oña N, Romero-Carrasco A, Pino-González MS. Regioselective epoxide opening of epoxyamides derived from d-glucose. Cyclization approaches to azepanes. ACTA ACUST UNITED AC 2013. [DOI: 10.1016/j.tetasy.2012.12.005] [Citation(s) in RCA: 3] [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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27
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Liu G, Zhang D, Li J, Xu G, Sun J. A highly enantioselective Darzens reaction between diazoacetamides and aldehydes catalyzed by a (+)-pinanediol–Ti(OiPr)4 system. Org Biomol Chem 2013; 11:900-4. [DOI: 10.1039/c2ob27179f] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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28
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Meninno S, Lattanzi A. Asymmetric organocatalysis mediated by α,α-l-diaryl prolinols: recent advances. Chem Commun (Camb) 2013; 49:3821-32. [DOI: 10.1039/c3cc36928e] [Citation(s) in RCA: 73] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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29
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Diastereoselective synthesis of aryl and alkyl trans-glycidic amides from pseudoephedrine-derived sulfonium salt. Chemospecific exo-tet ring closure for morpholin-3-ones. Tetrahedron 2012. [DOI: 10.1016/j.tet.2012.09.047] [Citation(s) in RCA: 7] [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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30
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King FD, Caddick S. The acid-mediated ring opening/cyclisation reaction of N-benzyl-α-aryl-azetidinones. Tetrahedron 2012. [DOI: 10.1016/j.tet.2012.09.046] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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31
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Functionalization of BINOL and application in the homo- and heterogeneous enantioselective epoxidation of α,β-unsaturated ketones. Tetrahedron Lett 2012. [DOI: 10.1016/j.tetlet.2012.09.004] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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32
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Fuentes L, Osorio U, Quintero L, Höpfl H, Vázquez-Cabrera N, Sartillo-Piscil F. Direct Chemical Method for Preparing 2,3-Epoxyamides Using Sodium Chlorite. J Org Chem 2012; 77:5515-24. [DOI: 10.1021/jo300542d] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Lilia Fuentes
- Centro de Investigación de la Facultad de Ciencias Químicas, BUAP, 14 Sur Esq. San Claudio, San Manuel, 72570, Puebla,
México
| | - Urbano Osorio
- Centro de Investigación de la Facultad de Ciencias Químicas, BUAP, 14 Sur Esq. San Claudio, San Manuel, 72570, Puebla,
México
| | - Leticia Quintero
- Centro de Investigación de la Facultad de Ciencias Químicas, BUAP, 14 Sur Esq. San Claudio, San Manuel, 72570, Puebla,
México
| | - Herbert Höpfl
- Centro de
Investigaciones Químicas, Universidad Autónoma del Estado de Morelos, Av. Universidad 1001, 62209,
Cuernavaca, México
| | - Nixache Vázquez-Cabrera
- Centro de Investigación de la Facultad de Ciencias Químicas, BUAP, 14 Sur Esq. San Claudio, San Manuel, 72570, Puebla,
México
| | - Fernando Sartillo-Piscil
- Centro de Investigación de la Facultad de Ciencias Químicas, BUAP, 14 Sur Esq. San Claudio, San Manuel, 72570, Puebla,
México
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33
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Russo A, De Fusco C, Lattanzi A. Organocatalytic Asymmetric Oxidations with Hydrogen Peroxide and Molecular Oxygen. ChemCatChem 2012. [DOI: 10.1002/cctc.201200139] [Citation(s) in RCA: 48] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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34
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Russo A, Galdi G, Croce G, Lattanzi A. Highly Enantioselective Epoxidation Catalyzed by Cinchona Thioureas: Synthesis of Functionalized Terminal Epoxides Bearing a Quaternary Stereogenic Center. Chemistry 2012; 18:6152-7. [DOI: 10.1002/chem.201200500] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2012] [Indexed: 11/06/2022]
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35
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Herchl R, Stiftinger M, Waser M. Identification of the best-suited leaving group for the diastereoselective synthesis of glycidic amides from stabilised ammonium ylides and aldehydes. Org Biomol Chem 2011; 9:7023-7. [PMID: 21833407 DOI: 10.1039/c1ob05721a] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
In comparison to the use of sulfur ylides, the use of ammonium ylides for the synthesis of epoxides is significantly less developed. As a part of our systematic investigations concerning the use of amide-stabilised ammonium ylides for the synthesis of glycidic amides we have focused on the identification of the best-suited amino leaving group for this purpose. Whereas tertiary amines like quinuclidine or cinchona alkaloids were found to be not suited for epoxide formation, trimethylamine was found to be the leaving group of choice, yielding trans-glycidic amides in excellent yields of > 90%.
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Affiliation(s)
- Richard Herchl
- Institute of Organic Chemistry, Johannes Kepler University Linz, Altenbergerstraße 69, 4040 Linz, Austria
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36
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Li BS, Zhang E, Zhang QW, Zhang FM, Tu YQ, Cao XP. One-Pot Construction of Multi-Substituted Spiro-Cycloalkanediones by an Organocatalytic Asymmetric Epoxidation/Semipinacol Rearrangement. Chem Asian J 2011; 6:2269-72. [DOI: 10.1002/asia.201100383] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2011] [Indexed: 11/05/2022]
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37
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Sen R, Hazra DK, Mukherjee M, Koner S. Gd26 Cluster Consisting of Distorted Cubane Cores: Synthesis, Structure and Heterogeneous Catalytic Epoxidation of Olefins. Eur J Inorg Chem 2011. [DOI: 10.1002/ejic.201100118] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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38
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Sarabia F, Vivar-García C, García-Castro M, Martín-Ortiz J. Cyclic Sulfur Ylides Derived from Gleason-Type Chiral Auxiliaries for the Asymmetric Synthesis of Epoxy Amides. J Org Chem 2011; 76:3139-50. [DOI: 10.1021/jo1025964] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Francisco Sarabia
- Department of Organic Chemistry and ‡Department of Physical Chemistry, Faculty of Sciences, University of Malaga,. Campus de Teatinos s/n, 29071 Malaga, Spain
| | - Carlos Vivar-García
- Department of Organic Chemistry and ‡Department of Physical Chemistry, Faculty of Sciences, University of Malaga,. Campus de Teatinos s/n, 29071 Malaga, Spain
| | - Miguel García-Castro
- Department of Organic Chemistry and ‡Department of Physical Chemistry, Faculty of Sciences, University of Malaga,. Campus de Teatinos s/n, 29071 Malaga, Spain
| | - Jorge Martín-Ortiz
- Department of Organic Chemistry and ‡Department of Physical Chemistry, Faculty of Sciences, University of Malaga,. Campus de Teatinos s/n, 29071 Malaga, Spain
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39
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Waser M, Herchl R, Müller N. Ammonium ylides for the diastereoselective synthesis of glycidic amides. Chem Commun (Camb) 2011; 47:2170-2. [PMID: 21180720 PMCID: PMC4202193 DOI: 10.1039/c0cc04821f] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A highly trans-selective protocol for the synthesis of glycidic amides was developed. This approach gave access to oxiranes by reacting stabilised ammonium ylides bearing an α-carbonyl group and aromatic aldehydes in moderate to good yields.
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Affiliation(s)
- Mario Waser
- Institute of Organic Chemistry, Johannes Kepler University Linz, Altenbergerstraße 69, 4040 Linz, Austria.
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40
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De Fusco C, Tedesco C, Lattanzi A. Organocatalytic Stereoselective Epoxidation of Trisubstituted Acrylonitriles. J Org Chem 2010; 76:676-9. [DOI: 10.1021/jo102020a] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Claudia De Fusco
- Dipartimento di Chimica, Università di Salerno, Via Ponte don Melillo, 84084, Fisciano, Italy
| | - Consiglia Tedesco
- Dipartimento di Chimica, Università di Salerno, Via Ponte don Melillo, 84084, Fisciano, Italy
| | - Alessandra Lattanzi
- Dipartimento di Chimica, Università di Salerno, Via Ponte don Melillo, 84084, Fisciano, Italy
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41
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Sen R, Koner S, Hazra DK, Helliwell M, Mukherjee M. Heterogeneous Catalytic Epoxidation of Olefins Over Hydrothermally Synthesized Lanthanide Containing Framework Compounds. Eur J Inorg Chem 2010. [DOI: 10.1002/ejic.201000937] [Citation(s) in RCA: 44] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
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42
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Merino O, Santoyo BM, Montiel LE, Jiménez-Vázquez HA, Zepeda LG, Tamariz J. Versatile synthesis of quaternary 1,3-oxazolidine-2,4-diones and their use in the preparation of α-hydroxyamides. Tetrahedron Lett 2010. [DOI: 10.1016/j.tetlet.2010.05.034] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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43
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Ling T, Potts BC, Macherla VR. Concise Formal Synthesis of (−)-Salinosporamide A (Marizomib) Using a Regio- and Stereoselective Epoxidation and Reductive Oxirane Ring-Opening Strategy. J Org Chem 2010; 75:3882-5. [DOI: 10.1021/jo100432g] [Citation(s) in RCA: 49] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Affiliation(s)
- Taotao Ling
- Nereus Pharmaceuticals, Inc., 10480 Wateridge Circle, San Diego, California 92121
| | - Barbara C. Potts
- Nereus Pharmaceuticals, Inc., 10480 Wateridge Circle, San Diego, California 92121
| | - Venkat R. Macherla
- Nereus Pharmaceuticals, Inc., 10480 Wateridge Circle, San Diego, California 92121
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44
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Chercheja S, Nadakudity S, Eilbracht P. Combination of Enantioselective Metal Catalysis and Organocatalysis: Enantioselective Sequential Hydroformylation/ Aldol Reactions. Adv Synth Catal 2010. [DOI: 10.1002/adsc.200900780] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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45
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Liu Y, Shang D, Zhou X, Zhu Y, Lin L, Liu X, Feng X. AgAsF6/Sm(OTf)3 promoted reversal of enantioselectivity for the asymmetric Friedel-Crafts alkylations of indoles with beta,gamma-unsaturated alpha-ketoesters. Org Lett 2010; 12:180-3. [PMID: 19938840 DOI: 10.1021/ol902587t] [Citation(s) in RCA: 84] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The first example of central metal controlled reversal of enantioselectivity in asymmetric Friedel-Crafts alkylation of indoles and beta,gamma-unsaturated alpha-ketoesters has been developed. Using the same chiral starting material derived N,N'-dioxides 1a and 1b as ligands, various indole esters 4 were obtained in good to excellent yields and enantioselectivities. The reaction also featured mild reaction conditions and remarkably low catalyst loading (down to 0.01 mol %).
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Affiliation(s)
- Yanling Liu
- Key Laboratory of Green Chemistry & Technology, Ministry of Education, College of Chemistry, Sichuan University, Chengdu 610064, PR China
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46
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Condensation of aromatic aldehydes with N,N-dimethylacetamide in presence of dialkyl carbonates as dehydrating agents. MONATSHEFTE FUR CHEMIE 2010. [DOI: 10.1007/s00706-009-0248-x] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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47
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Concellón J, Bernad P, Rodríguez-Solla H, Díaz P. Manganese-Promoted Regioselective Ring-Opening of 2,3-Epoxy Acid Derivatives: A New Route to α-Hydroxy Acid Derivatives. Adv Synth Catal 2009. [DOI: 10.1002/adsc.200900257] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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48
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Abraham CJ, Paull DH, Bekele T, Scerba MT, Dudding T, Lectka T. A surprising mechanistic "switch" in Lewis acid activation: a bifunctional, asymmetric approach to alpha-hydroxy acid derivatives. J Am Chem Soc 2008; 130:17085-94. [PMID: 19053448 PMCID: PMC2651146 DOI: 10.1021/ja806818a] [Citation(s) in RCA: 50] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
We report a detailed synthetic and mechanistic study of an unusual bifunctional, sequential hetero-Diels-Alder/ring-opening reaction in which chiral, metal complexed ketene enolates react with o-quinones to afford highly enantioenriched, alpha-hydroxylated carbonyl derivatives in excellent yield. A number of Lewis acids were screened in tandem with cinchona alkaloid derivatives; surprisingly, trans-(Ph(3)P)(2)PdCl(2) was found to afford the most dramatic increase in yield and rate of reaction. A series of Lewis acid binding motifs were explored through molecular modeling, as well as IR, UV, and NMR spectroscopy. Our observations document a fundamental mechanistic "switch", namely the formation of a tandem Lewis base/Lewis acid activated metal enolate in preference to a metal-coordinated quinone species (as observed in other reactions of o-quinone derivatives). This new method was applied to the syntheses of several pharmaceutical targets, each of which was obtained in high yield and enantioselectivity.
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Affiliation(s)
- Ciby J. Abraham
- Department of Chemistry, New Chemistry Building, Johns Hopkins University, 3400 North Charles Street, Baltimore, Maryland 21218, and Department of Chemistry, Brock University, St. Catharines, Ontario L2S 3A1, Canada
| | - Daniel H. Paull
- Department of Chemistry, New Chemistry Building, Johns Hopkins University, 3400 North Charles Street, Baltimore, Maryland 21218, and Department of Chemistry, Brock University, St. Catharines, Ontario L2S 3A1, Canada
| | | | - Michael T. Scerba
- Department of Chemistry, New Chemistry Building, Johns Hopkins University, 3400 North Charles Street, Baltimore, Maryland 21218, and Department of Chemistry, Brock University, St. Catharines, Ontario L2S 3A1, Canada
| | | | - Thomas Lectka
- Department of Chemistry, New Chemistry Building, Johns Hopkins University, 3400 North Charles Street, Baltimore, Maryland 21218, and Department of Chemistry, Brock University, St. Catharines, Ontario L2S 3A1, Canada
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49
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Enantioselective epoxidation of α,β-enones promoted by (1R,3S,4S)-2-azanorbornyl-3-methanol as an organocatalyst. Tetrahedron Lett 2008. [DOI: 10.1016/j.tetlet.2008.07.175] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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50
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Hara K, Park SY, Yamagiwa N, Matsunaga S, Shibasaki M. Catalytic Asymmetric Epoxidation of α,β-Unsaturated Phosphane Oxides with a Y(O-iPr)3/Biphenyldiol Complex. Chem Asian J 2008; 3:1500-4. [DOI: 10.1002/asia.200800035] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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