1
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Banerjee S, Vanka K. The Role of Aromatic Alcohol Additives on Asymmetric Organocatalysis Reactions: Insights from Theory. Chem Asian J 2024; 19:e202300997. [PMID: 38270228 DOI: 10.1002/asia.202300997] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2023] [Revised: 01/19/2024] [Accepted: 01/22/2024] [Indexed: 01/26/2024]
Abstract
The presence of an aromatic additive has been seen to enhance, often significantly, the enantioselectivity and yield in asymmetric organocatalysis. Considering their success across a dizzying range of organocatalysts and organic transformations, it would seem unlikely that a common principle exists for their functioning. However, the current investigations with DFT suggest a general principle: the phenolic additive sandwiches itself, through hydrogen bonding and π⋅⋅⋅π stacking, between the organocatalyst coordinated electrophile and nucleophile. This is seen for a wide range of experimentally reported systems. That such complex formation leads to enhanced stereoselectivity is then demonstrated for two cases: the cinchona alkaloid complex (BzCPD), catalysing thiocyanation (2-naphthol additive employed), as well as for L-pipecolicacid catalysing the asymmetric nitroaldol reaction with a range of nitro-substituted phenol additives. These findings, indicating that dual catalysis takes place when phenolic additives are employed, are likely to have a significant impact on the field of asymmetric organocatalysis.
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Affiliation(s)
- Subhrashis Banerjee
- Physical and Materials Chemistry Division, CSIR-National Chemical Laboratory, Dr.Homi Bhabha Road, Pune, 411008, Maharashtra, India
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, 201002, India
| | - Kumar Vanka
- Physical and Materials Chemistry Division, CSIR-National Chemical Laboratory, Dr.Homi Bhabha Road, Pune, 411008, Maharashtra, India
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, 201002, India
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2
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van Beek C, Samoshin VV. Conformationally locked cis-1,2-diaminocyclohexane-based axially chiral ligands for asymmetric catalysis. Tetrahedron Lett 2022. [DOI: 10.1016/j.tetlet.2022.153930] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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3
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Sonsona IG, Alegre-Requena JV, Marqués-López E, Gimeno MC, Herrera RP. Asymmetric Organocatalyzed Aza-Henry Reaction of Hydrazones: Experimental and Computational Studies. Chemistry 2020; 26:5469-5478. [PMID: 32012361 DOI: 10.1002/chem.202000232] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2020] [Indexed: 12/13/2022]
Abstract
The first asymmetric catalyzed aza-Henry reaction of hydrazones is presented. In this process, quinine was used as the catalyst to synthesize different alkyl substituted β-nitrohydrazides with ee up to 77 %. This ee was improved up to 94 % by a further recrystallization and the opposite enantiomer can be obtained by using quinidine as the catalyst, opening exciting possibilities in fields in which the control of chirality is vital, such as the pharmaceutical industry. Additionally, experimental and ab initio studies were performed to understand the reaction mechanism. The experimental results revealed an unexpected secondary kinetic isotope effect (KIE) that is explained by the calculated reaction pathway, which shows that the protonation of the initial hydrazone and the C-C bond forming reaction occur during a concerted process. This concerted mechanism makes the catalysis conceptually different to traditional base-promoted Henry and aza-Henry reactions.
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Affiliation(s)
- Isaac G Sonsona
- Laboratorio de Organocatálisis Asimétrica, Departamento de, Química Orgánica, Instituto de Síntesis Química y, Catálisis Homogénea (ISQCH), CSIC-Universidad de Zaragoza, C/ Pedro Cerbuna, No. 12., 50009, Zaragoza, Spain
| | - Juan V Alegre-Requena
- Laboratorio de Organocatálisis Asimétrica, Departamento de, Química Orgánica, Instituto de Síntesis Química y, Catálisis Homogénea (ISQCH), CSIC-Universidad de Zaragoza, C/ Pedro Cerbuna, No. 12., 50009, Zaragoza, Spain
| | - Eugenia Marqués-López
- Laboratorio de Organocatálisis Asimétrica, Departamento de, Química Orgánica, Instituto de Síntesis Química y, Catálisis Homogénea (ISQCH), CSIC-Universidad de Zaragoza, C/ Pedro Cerbuna, No. 12., 50009, Zaragoza, Spain
| | - M Concepción Gimeno
- Departamento de Química Inorgánica, Instituto de, Síntesis Química y Catálisis Homogénea (ISQCH), CSIC-Universidad de, Zaragoza, C/ Pedro Cerbuna, No. 12., 50009, Zaragoza, Spain
| | - Raquel P Herrera
- Laboratorio de Organocatálisis Asimétrica, Departamento de, Química Orgánica, Instituto de Síntesis Química y, Catálisis Homogénea (ISQCH), CSIC-Universidad de Zaragoza, C/ Pedro Cerbuna, No. 12., 50009, Zaragoza, Spain
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4
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Zhang Y, Wu XY, Han J. Chiral iminophosphorane catalyzed asymmetric Henry reaction of α,β-alkynyl ketoesters. CHINESE CHEM LETT 2019. [DOI: 10.1016/j.cclet.2019.04.042] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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5
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Liu M, Gui D, Deng P, Zhou H. Asymmetric Henry Reaction of 2-Acylpyridine N-Oxides Catalyzed by a Ni-Aminophenol Sulfonamide Complex: An Unexpected Mononuclear Catalyst. Molecules 2019; 24:E1471. [PMID: 31013997 PMCID: PMC6514737 DOI: 10.3390/molecules24081471] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2019] [Revised: 04/11/2019] [Accepted: 04/12/2019] [Indexed: 12/13/2022] Open
Abstract
The asymmetric Henry reaction of 2-acylpyridine N-oxide remains a challenge as N-oxides generally act as competitive catalyst inhibitors or displace activating ligands. A novel variable yield (up to 99%) asymmetric Henry reaction of 2-acypyridine N-oxides catalyzed by a Ni-aminophenol sulfonamide complex with good to excellent enantioselectivity (up to 99%) has been developed. Mechanistic studies suggest that the unique properties of the electron-pairs of N-oxides for complexation with Ni makes the unexpected mononuclear complex, rather than the previously reported dinuclear complex, the active species.
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Affiliation(s)
- Mouxiong Liu
- School of Pharmaceutical Science, Chongqing Medical University, Chongqing 400016, China.
| | - Dongdong Gui
- School of Pharmaceutical Science, Chongqing Medical University, Chongqing 400016, China.
| | - Ping Deng
- School of Pharmaceutical Science, Chongqing Medical University, Chongqing 400016, China.
| | - Hui Zhou
- School of Pharmaceutical Science, Chongqing Medical University, Chongqing 400016, China.
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6
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Nazish M, Kumar G, Tak R, Khan NUH, Kureshy RI. Enantioselective Synthesis of β-Nitrophosphonates Using Immobilized Quinine Organocatalyst on Mesoporous SBA-15 as an Efficient Recyclable Catalyst. ChemistrySelect 2018. [DOI: 10.1002/slct.201801525] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Mohd Nazish
- Inorganic Materials and Catalysis Division; CSIR-Central Salt and Marine Chemicals Research Institute (CSIR-CSMCRI); SCouncil of Scientific & Industrial Research (CSIR), G. B. Marg, Bhavnagar; 364002, Gujarat India
- Academy of Scientific and Innovative Research (AcSIR), (CSIR-CSMCRI), Bhavnagar; 364002, Gujarat India
| | - Gaurav Kumar
- Inorganic Materials and Catalysis Division; CSIR-Central Salt and Marine Chemicals Research Institute (CSIR-CSMCRI); SCouncil of Scientific & Industrial Research (CSIR), G. B. Marg, Bhavnagar; 364002, Gujarat India
- Academy of Scientific and Innovative Research (AcSIR), (CSIR-CSMCRI), Bhavnagar; 364002, Gujarat India
| | - Rajkumar Tak
- Inorganic Materials and Catalysis Division; CSIR-Central Salt and Marine Chemicals Research Institute (CSIR-CSMCRI); SCouncil of Scientific & Industrial Research (CSIR), G. B. Marg, Bhavnagar; 364002, Gujarat India
- Academy of Scientific and Innovative Research (AcSIR), (CSIR-CSMCRI), Bhavnagar; 364002, Gujarat India
| | - Noor-ul H. Khan
- Inorganic Materials and Catalysis Division; CSIR-Central Salt and Marine Chemicals Research Institute (CSIR-CSMCRI); SCouncil of Scientific & Industrial Research (CSIR), G. B. Marg, Bhavnagar; 364002, Gujarat India
- Academy of Scientific and Innovative Research (AcSIR), (CSIR-CSMCRI), Bhavnagar; 364002, Gujarat India
| | - Rukhsana I. Kureshy
- Inorganic Materials and Catalysis Division; CSIR-Central Salt and Marine Chemicals Research Institute (CSIR-CSMCRI); SCouncil of Scientific & Industrial Research (CSIR), G. B. Marg, Bhavnagar; 364002, Gujarat India
- Academy of Scientific and Innovative Research (AcSIR), (CSIR-CSMCRI), Bhavnagar; 364002, Gujarat India
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7
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Levopimaric acid derived 1,2-diamines and their application in the copper-catalyzed asymmetric Henry reaction. Tetrahedron 2018. [DOI: 10.1016/j.tet.2017.11.059] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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8
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He F, Chen G, Yang J, Liang G, Deng P, Xiong Y, Zhou H. Catalytic enantioselective Henry reaction of α-keto esters, 2-acylpyridines and 2-acylpyridine N-oxides. RSC Adv 2018; 8:9414-9422. [PMID: 35541881 PMCID: PMC9078658 DOI: 10.1039/c8ra00552d] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2018] [Accepted: 02/19/2018] [Indexed: 12/25/2022] Open
Abstract
Asymmetric Henry reaction of ketones catalyzed by a pre-prepared Ni complex with low catalyst loading.
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Affiliation(s)
- Feilong He
- School of Pharmaceutical Science
- Chongqing Medical University
- Chongqing 400016
- PR China
| | - Guanghui Chen
- School of Pharmaceutical Science
- Chongqing Medical University
- Chongqing 400016
- PR China
| | - Junxia Yang
- School of Pharmaceutical Science
- Chongqing Medical University
- Chongqing 400016
- PR China
| | - Guojuan Liang
- School of Pharmaceutical Science
- Chongqing Medical University
- Chongqing 400016
- PR China
| | - Ping Deng
- School of Pharmaceutical Science
- Chongqing Medical University
- Chongqing 400016
- PR China
| | - Yan Xiong
- School of Chemistry and Chemical Engineering
- Chongqing University
- Chongqing 401331
- PR China
| | - Hui Zhou
- School of Pharmaceutical Science
- Chongqing Medical University
- Chongqing 400016
- PR China
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9
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Manzano R, Datta S, Paton RS, Dixon DJ. Enantioselective Silver and Amine Co-catalyzed Desymmetrizing Cycloisomerization of Alkyne-Linked Cyclohexanones. Angew Chem Int Ed Engl 2017. [DOI: 10.1002/ange.201612048] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Affiliation(s)
- Rubén Manzano
- Department of Chemistry, Chemistry Research Laboratory; University of Oxford; Mansfield Road Oxford OX1 3TA UK
| | - Swarup Datta
- Department of Chemistry, Chemistry Research Laboratory; University of Oxford; Mansfield Road Oxford OX1 3TA UK
| | - Robert S. Paton
- Department of Chemistry, Chemistry Research Laboratory; University of Oxford; Mansfield Road Oxford OX1 3TA UK
| | - Darren J. Dixon
- Department of Chemistry, Chemistry Research Laboratory; University of Oxford; Mansfield Road Oxford OX1 3TA UK
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10
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Manzano R, Datta S, Paton RS, Dixon DJ. Enantioselective Silver and Amine Co-catalyzed Desymmetrizing Cycloisomerization of Alkyne-Linked Cyclohexanones. Angew Chem Int Ed Engl 2017; 56:5834-5838. [PMID: 28429384 DOI: 10.1002/anie.201612048] [Citation(s) in RCA: 37] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2016] [Revised: 03/02/2017] [Indexed: 01/23/2023]
Abstract
A silver(I) and amine co-catalyzed desymmetrization of 4-propargylamino cyclohexanones for the direct enantioselective synthesis of 2-azabicyclo[3.3.1]nonanes is described. Exploiting reactivity arising from dual activation of the pendant terminal alkyne by silver(I) and the ketone moiety through transient enamine formation, this synthetically relevant transformation is easy to perform, efficient and broad in scope. High enantioselectivity (up to 96 % ee) was achieved by exploiting a significant matching effect between the chirality of a cinchona alkaloid-derived aminophosphine ligand for the silver(I) salt and the 2-bis(aryl)methylpyrrolidine catalyst which was rationalized by DFT calculations. This allowed for the preparation of both enantiomers of the bicyclic product with near-identical stereocontrol.
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Affiliation(s)
- Rubén Manzano
- Department of Chemistry, Chemistry Research Laboratory, University of Oxford, Mansfield Road, Oxford, OX1 3TA, UK
| | - Swarup Datta
- Department of Chemistry, Chemistry Research Laboratory, University of Oxford, Mansfield Road, Oxford, OX1 3TA, UK
| | - Robert S Paton
- Department of Chemistry, Chemistry Research Laboratory, University of Oxford, Mansfield Road, Oxford, OX1 3TA, UK
| | - Darren J Dixon
- Department of Chemistry, Chemistry Research Laboratory, University of Oxford, Mansfield Road, Oxford, OX1 3TA, UK
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11
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Vamisetti GB, Chowdhury R, Ghosh SK. Organocatalytic decarboxylative aldol reaction of β-ketoacids with α-ketophosphonates en route to the enantioselective synthesis of tertiary α-hydroxyphosphonates. Org Biomol Chem 2017; 15:3869-3873. [DOI: 10.1039/c7ob00796e] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
γ-Aroyl tertiary α-hydroxyphosphonates with a chiral quaternary centre were synthesized via a facile organocatalyzed decarboxylative aldol reaction between β-ketoacids and α-ketophosphonates.
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Affiliation(s)
- Ganga B. Vamisetti
- Bio-Organic Division
- Bhabha Atomic Research Centre
- Mumbai 400085
- India
- Homi Bhabha National Institute
| | | | - Sunil K. Ghosh
- Bio-Organic Division
- Bhabha Atomic Research Centre
- Mumbai 400085
- India
- Homi Bhabha National Institute
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12
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Zhang ML, Yue DF, Wang ZH, Luo Y, Xu XY, Zhang XM, Yuan WC. Organocatalytic asymmetric Henry reaction of 1H-pyrrole-2,3-diones with bifunctional amine-thiourea catalysts bearing multiple hydrogen-bond donors. Beilstein J Org Chem 2016; 12:295-300. [PMID: 26977188 PMCID: PMC4778496 DOI: 10.3762/bjoc.12.31] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2015] [Accepted: 02/01/2016] [Indexed: 12/30/2022] Open
Abstract
For the first time, a catalytic asymmetric Henry reaction of 1H-pyrrole-2,3-diones was achieved with a chiral bifunctional amine-thiourea as a catalyst possessing multiple hydrogen-bond donors. With this developed method, a range of 3-hydroxy-3-nitromethyl-1H-pyrrol-2(3H)-ones bearing quaternary stereocenters were obtained in acceptable yield (up to 75%) and enantioselectivity (up to 73% ee).
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Affiliation(s)
- Ming-Liang Zhang
- National Engineering Research Center of Chiral Drugs, Chengdu Institute of Organic Chemistry, Chinese Academy of Sciences, Chengdu 610041, China; University of Chinese Academy of Sciences, Beijing 100049, China
| | - Deng-Feng Yue
- National Engineering Research Center of Chiral Drugs, Chengdu Institute of Organic Chemistry, Chinese Academy of Sciences, Chengdu 610041, China; University of Chinese Academy of Sciences, Beijing 100049, China
| | - Zhen-Hua Wang
- National Engineering Research Center of Chiral Drugs, Chengdu Institute of Organic Chemistry, Chinese Academy of Sciences, Chengdu 610041, China; University of Chinese Academy of Sciences, Beijing 100049, China
| | - Yuan Luo
- National Engineering Research Center of Chiral Drugs, Chengdu Institute of Organic Chemistry, Chinese Academy of Sciences, Chengdu 610041, China; University of Chinese Academy of Sciences, Beijing 100049, China
| | - Xiao-Ying Xu
- National Engineering Research Center of Chiral Drugs, Chengdu Institute of Organic Chemistry, Chinese Academy of Sciences, Chengdu 610041, China
| | - Xiao-Mei Zhang
- National Engineering Research Center of Chiral Drugs, Chengdu Institute of Organic Chemistry, Chinese Academy of Sciences, Chengdu 610041, China
| | - Wei-Cheng Yuan
- National Engineering Research Center of Chiral Drugs, Chengdu Institute of Organic Chemistry, Chinese Academy of Sciences, Chengdu 610041, China
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13
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Zlotin SG, Kochetkov SV. C2-Symmetric diamines and their derivatives as promising organocatalysts for asymmetric synthesis. RUSSIAN CHEMICAL REVIEWS 2015. [DOI: 10.1070/rcr4562] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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14
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Kayal S, Mukherjee S. Catalytic Aldol–Cyclization Cascade of 3-Isothiocyanato Oxindoles with α-Ketophosphonates for the Enantioselective Synthesis of β-Amino-α-hydroxyphosphonates. Org Lett 2015; 17:5508-11. [DOI: 10.1021/acs.orglett.5b02929] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Satavisha Kayal
- Department of Organic Chemistry, Indian Institute of Science, Bangalore - 560012, India
| | - Santanu Mukherjee
- Department of Organic Chemistry, Indian Institute of Science, Bangalore - 560012, India
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15
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Serrano I, Monge D, Álvarez E, Fernández R, Lassaletta JM. Asymmetric organocatalytic synthesis of quaternary α-hydroxy phosphonates: en route to α-aryl phosphaisoserines. Chem Commun (Camb) 2015; 51:4077-80. [PMID: 25661271 DOI: 10.1039/c4cc10390d] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The dual activation of acyl phosphonates and formaldehyde tert-butyl hydrazone by a BINAM-derived bis-urea catalyst is the key to achieve high reactivities and enantioselectivities in the synthesis of densely functionalized quaternary α-hydroxy phosphonates. Subsequent high-yielding transformations in a 'one-pot' fashion provide direct access to valuable azoxy compounds and quaternary α-aryl-phosphaisoserines.
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Affiliation(s)
- Inmaculada Serrano
- Departamento de Química Orgánica, Universidad de Sevilla, C/ Prof. García González, 1, 41012 Sevilla, Spain.
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16
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Maji B, Yamamoto H. Copper-Catalyzed Asymmetric Synthesis of Tertiary α-Hydroxy Phosphonic Acid Derivatives with In Situ Generated Nitrosocarbonyl Compounds as the Oxygen Source. Angew Chem Int Ed Engl 2014. [DOI: 10.1002/ange.201408893] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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17
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Copper-Catalyzed Asymmetric Synthesis of Tertiary α-Hydroxy Phosphonic Acid Derivatives with In Situ Generated Nitrosocarbonyl Compounds as the Oxygen Source. Angew Chem Int Ed Engl 2014; 53:14472-5. [DOI: 10.1002/anie.201408893] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2014] [Indexed: 11/07/2022]
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18
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Asymmetric catalysis as a method for the synthesis of chiral organophosphorus compounds. ACTA ACUST UNITED AC 2014. [DOI: 10.1016/j.tetasy.2014.05.010] [Citation(s) in RCA: 60] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
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19
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Frings M, Thomé I, Schiffers I, Pan F, Bolm C. Catalytic, Asymmetric Synthesis of Phosphonic γ-(Hydroxyalkyl)butenolides with Contiguous Quaternary and Tertiary Stereogenic Centers. Chemistry 2014; 20:1691-700. [DOI: 10.1002/chem.201304331] [Citation(s) in RCA: 45] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2013] [Indexed: 11/10/2022]
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20
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Faísca Phillips AM, Barros MT, Pacheco M, Dias R. Synthesis and biological evaluation of α-hydroxyalkylphosphonates as new antimicrobial agents. Bioorg Med Chem Lett 2014; 24:49-53. [DOI: 10.1016/j.bmcl.2013.12.002] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2013] [Revised: 11/29/2013] [Accepted: 12/01/2013] [Indexed: 10/25/2022]
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21
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Hou G, Yu J, Yu C, Wu G, Miao Z. Enantio- and Diastereoselective Vinylogous Mukaiyama Aldol Reactions of α-Keto Phosphonates with 2-(Trimethylsilyloxy)- furan Catalyzed by Bis(oxazoline)-Copper Complexes. Adv Synth Catal 2013. [DOI: 10.1002/adsc.201200810] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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22
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Bisai V, Bisai A, Singh VK. Enantioselective organocatalytic aldol reaction using small organic molecules. Tetrahedron 2012. [DOI: 10.1016/j.tet.2012.03.099] [Citation(s) in RCA: 119] [Impact Index Per Article: 9.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
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23
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Zhou S, Wu Z, Rong J, Wang S, Yang G, Zhu X, Zhang L. Highly efficient hydrophosphonylation of aldehydes and unactivated ketones catalyzed by methylene-linked pyrrolyl rare earth metal amido complexes. Chemistry 2012; 18:2653-9. [PMID: 22259029 DOI: 10.1002/chem.201102207] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2011] [Indexed: 11/06/2022]
Abstract
A series of rare earth metal amido complexes bearing methylene-linked pyrrolyl-amido ligands were prepared through silylamine elimination reactions and displayed high catalytic activities in hydrophosphonylations of aldehydes and unactivated ketones under solvent-free conditions for liquid substrates. Treatment of [(Me(3)Si)(2)N](3)Ln(μ-Cl)Li(THF)(3) with 2-(2,6-Me(2)C(6)H(3)NHCH(2))C(4)H(3)NH (1, 1 equiv) in toluene afforded the corresponding trivalent rare earth metal amides of formula {(μ-η(5):η(1)):η(1)-2-[(2,6-Me(2)C(6)H(3))NCH(2)](C(4)H(3)N)LnN(SiMe(3))(2)}(2) [Ln=Y (2), Nd (3), Sm (4), Dy (5), Yb (6)] in moderate to good yields. All compounds were fully characterized by spectroscopic methods and elemental analyses. The yttrium complex was also characterized by (1)H NMR spectroscopic analyses. The structures of complexes 2, 3, 4, and 6 were determined by single-crystal X-ray analyses. Study of the catalytic activities of the complexes showed that these rare earth metal amido complexes were excellent catalysts for hydrophosphonylations of aldehydes and unactivated ketones. The catalyzed reactions between diethyl phosphite and aldehydes in the presence of the rare earth metal amido complexes (0.1 mol%) afforded the products in high yields (up to 99%) at room temperature in short times of 5 to 10 min. Furthermore, the catalytic addition of diethyl phosphite to unactivated ketones also afforded the products in high yields of up to 99% with employment of low loadings (0.1 to 0.5 mol%) of the rare earth metal amido complexes at room temperature in short times of 20 min. The system works well for a wide range of unactivated aliphatic, aromatic or heteroaromatic ketones, especially for substituted benzophenones, giving the corresponding α-hydroxy diaryl phosphonates in moderate to high yields.
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Affiliation(s)
- Shuangliu Zhou
- Laboratory of Functionalized Molecular Solids, Ministry of Education, College of Chemistry and Materials Science, Anhui Normal University, Wuhu, Anhui 241000, PR China
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24
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Zhou S, Wang H, Ping J, Wang S, Zhang L, Zhu X, Wei Y, Wang F, Feng Z, Gu X, Yang S, Miao H. Synthesis and Characterization of Organolanthanide Complexes with a Calix[4]-pyrrolyl Ligand and Their Catalytic Activities toward Hydrophosphonylation of Aldehydes and Unactivated Ketones. Organometallics 2012. [DOI: 10.1021/om2008925] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Shuangliu Zhou
- Laboratory of Functionalized
Molecular Solids, Ministry of Education, Anhui Laboratory of Molecule-Based
Materials, Institute of Organic Chemistry, College of Chemistry and
Materials Science, Anhui Normal University, Wuhu, Anhui 241000, People's Republic of China
| | - Hengyu Wang
- Laboratory of Functionalized
Molecular Solids, Ministry of Education, Anhui Laboratory of Molecule-Based
Materials, Institute of Organic Chemistry, College of Chemistry and
Materials Science, Anhui Normal University, Wuhu, Anhui 241000, People's Republic of China
| | - Jian Ping
- Laboratory of Functionalized
Molecular Solids, Ministry of Education, Anhui Laboratory of Molecule-Based
Materials, Institute of Organic Chemistry, College of Chemistry and
Materials Science, Anhui Normal University, Wuhu, Anhui 241000, People's Republic of China
| | - Shaowu Wang
- Laboratory of Functionalized
Molecular Solids, Ministry of Education, Anhui Laboratory of Molecule-Based
Materials, Institute of Organic Chemistry, College of Chemistry and
Materials Science, Anhui Normal University, Wuhu, Anhui 241000, People's Republic of China
- State Key Laboratory of Organometallic
Chemistry, Shanghai Institute of Organic Chemistry, Shanghai 200032, People's Republic of China
| | - Lijun Zhang
- Laboratory of Functionalized
Molecular Solids, Ministry of Education, Anhui Laboratory of Molecule-Based
Materials, Institute of Organic Chemistry, College of Chemistry and
Materials Science, Anhui Normal University, Wuhu, Anhui 241000, People's Republic of China
| | - Xiancui Zhu
- Laboratory of Functionalized
Molecular Solids, Ministry of Education, Anhui Laboratory of Molecule-Based
Materials, Institute of Organic Chemistry, College of Chemistry and
Materials Science, Anhui Normal University, Wuhu, Anhui 241000, People's Republic of China
| | - Yun Wei
- Laboratory of Functionalized
Molecular Solids, Ministry of Education, Anhui Laboratory of Molecule-Based
Materials, Institute of Organic Chemistry, College of Chemistry and
Materials Science, Anhui Normal University, Wuhu, Anhui 241000, People's Republic of China
| | - Fenhua Wang
- Laboratory of Functionalized
Molecular Solids, Ministry of Education, Anhui Laboratory of Molecule-Based
Materials, Institute of Organic Chemistry, College of Chemistry and
Materials Science, Anhui Normal University, Wuhu, Anhui 241000, People's Republic of China
| | - Zhijun Feng
- Laboratory of Functionalized
Molecular Solids, Ministry of Education, Anhui Laboratory of Molecule-Based
Materials, Institute of Organic Chemistry, College of Chemistry and
Materials Science, Anhui Normal University, Wuhu, Anhui 241000, People's Republic of China
| | - Xiaoxia Gu
- Laboratory of Functionalized
Molecular Solids, Ministry of Education, Anhui Laboratory of Molecule-Based
Materials, Institute of Organic Chemistry, College of Chemistry and
Materials Science, Anhui Normal University, Wuhu, Anhui 241000, People's Republic of China
| | - Song Yang
- Laboratory of Functionalized
Molecular Solids, Ministry of Education, Anhui Laboratory of Molecule-Based
Materials, Institute of Organic Chemistry, College of Chemistry and
Materials Science, Anhui Normal University, Wuhu, Anhui 241000, People's Republic of China
| | - Hui Miao
- Laboratory of Functionalized
Molecular Solids, Ministry of Education, Anhui Laboratory of Molecule-Based
Materials, Institute of Organic Chemistry, College of Chemistry and
Materials Science, Anhui Normal University, Wuhu, Anhui 241000, People's Republic of China
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25
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Abbaraju S, Bhanushali M, Zhao CG. Quinidine thiourea-catalyzed enantioselective synthesis of β-nitrophosphonates: Beneficial effects of molecular sieves. Tetrahedron 2011; 67:7479-7484. [PMID: 21921970 DOI: 10.1016/j.tet.2011.07.059] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Abstract
An efficient method for enantioselective synthesis of β-nitrophosphonates via the Michael addition of diphenyl phosphite to nitroalkenes using the readily available quinidine thiourea organocatalyst has been developed. The desired β-nitrophosphonates were obtained in good ee values. Molecular sieves were found to be crucial for achieving high reproducible yields in this reaction.
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Affiliation(s)
- Santhi Abbaraju
- Department of Chemistry, University of Texas at San Antonio, One UTSA Circle, San Antonio, Texas 78249, USA
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26
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Cheong PHY, Legault CY, Um JM, Çelebi-Ölçüm N, Houk KN. Quantum mechanical investigations of organocatalysis: mechanisms, reactivities, and selectivities. Chem Rev 2011; 111:5042-137. [PMID: 21707120 PMCID: PMC3154597 DOI: 10.1021/cr100212h] [Citation(s) in RCA: 429] [Impact Index Per Article: 33.0] [Reference Citation Analysis] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Affiliation(s)
- Paul Ha-Yeon Cheong
- Oregon State University, Department of Chemistry, 153 Gilbert Hall, Corvallis, OR 97331-4003 USA
| | - Claude Y. Legault
- University of Sherbrooke, Department of Chemistry, 2500 boul. de l’Université, local D1-3029, Sherbrooke (Québec) J1K 2R1 CANADA
| | - Joann M. Um
- University of California Los Angeles, Department of Chemistry and Biochemistry, 607 Charles E. Young Drive East, Los Angeles, CA 90095-1569 USA
| | - Nihan Çelebi-Ölçüm
- University of California Los Angeles, Department of Chemistry and Biochemistry, 607 Charles E. Young Drive East, Los Angeles, CA 90095-1569 USA
| | - K. N. Houk
- University of California Los Angeles, Department of Chemistry and Biochemistry, 607 Charles E. Young Drive East, Los Angeles, CA 90095-1569 USA
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27
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Perera S, Naganaboina VK, Wang L, Zhang B, Guo Q, Rout L, Zhao CG. Organocatalytic High Enantioselective Synthesis of β-Formyl-α-hydroxyphosphonates. Adv Synth Catal 2011; 353:1729-1734. [PMID: 21918646 PMCID: PMC3170695 DOI: 10.1002/adsc.201000835] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
The cross aldol reaction between enolizable aldehydes and α-ketophosphonates was achieved for the first time by using 9-amino-9-deoxy-epi-quinine as the catalyst. β-Formyl-α-hydroxyphosphonates were obtained in high to excellent enantioselectivities. The reaction works especially well with acetaldehyde, which is a tough substrate for organocatalyzed cross aldol reactions. The products were demonstrated to have anticancer activities.
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Affiliation(s)
- Sandun Perera
- Department of Chemistry, University of Texas at San Antonio, One UTSA Circle, San Antonio, TX 78249, USA
| | - Vijaya Kumar Naganaboina
- Department of Chemistry, University of Texas at San Antonio, One UTSA Circle, San Antonio, TX 78249, USA
| | - Long Wang
- Department of Medicine, University of Texas Health Science Center at San Antonio, 7703 Floyd Curl Dr., San Antonio, Texas, 78229-3900, USA
| | - Bin Zhang
- Department of Medicine, University of Texas Health Science Center at San Antonio, 7703 Floyd Curl Dr., San Antonio, Texas, 78229-3900, USA
| | - Qunsheng Guo
- Department of Chemistry, University of Texas at San Antonio, One UTSA Circle, San Antonio, TX 78249, USA
| | - Laxmidhar Rout
- Department of Chemistry, University of Texas at San Antonio, One UTSA Circle, San Antonio, TX 78249, USA
| | - Cong-Gui Zhao
- Department of Chemistry, University of Texas at San Antonio, One UTSA Circle, San Antonio, TX 78249, USA
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28
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Liu L, Zhang S, Xue F, Lou G, Zhang H, Ma S, Duan W, Wang W. Catalytic Enantioselective Henry Reactions of Isatins: Application in the Concise Synthesis of (
S
)‐(−)‐Spirobrassinin. Chemistry 2011; 17:7791-5. [DOI: 10.1002/chem.201101025] [Citation(s) in RCA: 93] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2011] [Indexed: 11/06/2022]
Affiliation(s)
- Lu Liu
- School of Pharmacy, East China University of Science and Technology, 130 Mei‐long Road, Shanghai 200237 (P.R. China)
| | - Shilei Zhang
- School of Pharmacy, East China University of Science and Technology, 130 Mei‐long Road, Shanghai 200237 (P.R. China)
| | - Fei Xue
- School of Pharmacy, East China University of Science and Technology, 130 Mei‐long Road, Shanghai 200237 (P.R. China)
| | - Guangshun Lou
- School of Pharmacy, East China University of Science and Technology, 130 Mei‐long Road, Shanghai 200237 (P.R. China)
| | - Haoyi Zhang
- School of Pharmacy, East China University of Science and Technology, 130 Mei‐long Road, Shanghai 200237 (P.R. China)
| | - Shichao Ma
- School of Pharmacy, East China University of Science and Technology, 130 Mei‐long Road, Shanghai 200237 (P.R. China)
| | - Wenhu Duan
- School of Pharmacy, East China University of Science and Technology, 130 Mei‐long Road, Shanghai 200237 (P.R. China)
- Shanghai Institute of Materia Medica, Chinese Academy of Sciences, 555 Zuchongzhi Road, Shanghai 201203 (P.R. China)
| | - Wei Wang
- School of Pharmacy, East China University of Science and Technology, 130 Mei‐long Road, Shanghai 200237 (P.R. China)
- Shanghai Institute of Materia Medica, Chinese Academy of Sciences, 555 Zuchongzhi Road, Shanghai 201203 (P.R. China)
- Department of Chemistry & Chemical Biology, University of New Mexico, MSC03 2060, Albuquerque, NM 87131‐0001 (USA), Fax: (+1) 505‐277‐2609
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29
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30
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Rodig MJ, Seo H, Hirsch-Weil D, Abboud KA, Hong S. Isoquinoline-based diimine ligands for Cu(II)-catalyzed enantioselective nitroaldol (Henry) reactions. ACTA ACUST UNITED AC 2011. [DOI: 10.1016/j.tetasy.2011.05.018] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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31
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Lee HJ, Kim JH, Kim DY. Organocatalytic Enantioselective Synthesis of Tertiary α-Hydroxy Phosphonates. B KOREAN CHEM SOC 2011. [DOI: 10.5012/bkcs.2011.32.3.785] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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32
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Wang M, Lin L, Shi J, Liu X, Kuang Y, Feng X. Asymmetric crossed-conjugate addition of nitroalkenes to enones by a chiral bifunctional diamine organocatalyst. Chemistry 2011; 17:2365-8. [PMID: 21319233 DOI: 10.1002/chem.201002961] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2010] [Indexed: 11/07/2022]
Affiliation(s)
- Min Wang
- Key Laboratory of Green Chemistry & Technology, Ministry of Education, College of Chemistry, Sichuan University, Chengdu 610064, P.R. China
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33
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Computational investigations of the stereoselectivities of proline-related catalysts for aldol reactions. ACTA ACUST UNITED AC 2010; 324:31-38. [PMID: 20634993 DOI: 10.1016/j.molcata.2010.03.020] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Abstract
Computational investigation of the aldol reaction of benzaldehyde with acetone catalyzed by various proline derivatives and 2-azetidine carboxylic acid reveal the origins of stereoselectivities of these reactions. Structural differences between catalysts and transition states were analyzed with density functional theory geometries in order to establish the key factors that will help in the design of new catalysts.
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34
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Zhu Y, Malerich JP, Rawal VH. Squaramide-catalyzed enantioselective Michael addition of diphenyl phosphite to nitroalkenes. Angew Chem Int Ed Engl 2010; 49:153-6. [PMID: 19950156 DOI: 10.1002/anie.200904779] [Citation(s) in RCA: 278] [Impact Index Per Article: 19.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Ye Zhu
- Department of Chemistry, University of Chicago, 5735 S. Ellis Ave. Chicago, IL 60637, USA
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35
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Albrecht Ł, Albrecht A, Krawczyk H, Jørgensen KA. Organocatalytic asymmetric synthesis of organophosphorus compounds. Chemistry 2010; 16:28-48. [PMID: 20014081 DOI: 10.1002/chem.200902634] [Citation(s) in RCA: 151] [Impact Index Per Article: 10.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
240 Years have passed since the discovery of elemental phosphorus. During that time organophosphorus chemistry has emerged as an interesting and exciting field of research. Recently organophosphorus chemistry has been raised to a new level. Organophosphorus compounds have found applications in asymmetric organocatalysis for the synthesis of optically active compounds of synthetic or biological importance. The aim of this review article is to present recent contributions to this developing field of chemistry and to point out synthetic advantages of methodologies developed so far.
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Affiliation(s)
- Łukasz Albrecht
- Department of Chemistry, Center for Catalysis, Aarhus University 8000 Aarhus C, Denmark
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36
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Uraguchi D, Ito T, Nakamura S, Ooi T. Catalytic asymmetric hydrophosphonylation of ynones. Chem Sci 2010. [DOI: 10.1039/c0sc00268b] [Citation(s) in RCA: 57] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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37
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Zhu Y, Malerich J, Rawal V. Squaramide-Catalyzed Enantioselective Michael Addition of Diphenyl Phosphite to Nitroalkenes. Angew Chem Int Ed Engl 2009. [DOI: 10.1002/ange.200904779] [Citation(s) in RCA: 97] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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38
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Jiang J, Chen X, Wang J, Hui Y, Liu X, Lin L, Feng X. Chiral biphenylamide derivative: an efficient organocatalyst for the enantioselective synthesis of alpha-hydroxy phosphonates. Org Biomol Chem 2009; 7:4355-7. [PMID: 19830282 DOI: 10.1039/b917554g] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The aldol reactions of alpha-keto phosphonates and aldehydes were facilitated by an axially chiral biphenylprolinamide under mild conditions, affording the synthetically and pharmaceutically useful products in high yields and excellent enantioselectivities.
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Affiliation(s)
- Jun Jiang
- Key Laboratory of Green Chemistry & Technology, Ministry of Education, College of Chemistry, Sichuan University, Chengdu 610064, China
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39
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Zhou X, Liu Y, Chang L, Zhao J, Shang D, Liu X, Lin L, Feng X. Highly Efficient Synthesis of Quaternary α-Hydroxy PhosphonatesviaLewis Acid-Catalyzed Hydrophosphonylation of Ketones. Adv Synth Catal 2009. [DOI: 10.1002/adsc.200900531] [Citation(s) in RCA: 61] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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40
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Dong Z, Wang L, Chen X, Liu X, Lin L, Feng X. Organocatalytic Enantioselective Michael Addition of 4-Hydroxycoumarin to α,β-Unsaturated Ketones: A Simple Synthesis of Warfarin. European J Org Chem 2009. [DOI: 10.1002/ejoc.200900831] [Citation(s) in RCA: 57] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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41
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Nitabaru T, Nojiri A, Kobayashi M, Kumagai N, Shibasaki M. anti-Selective Catalytic Asymmetric Nitroaldol Reaction via a Heterobimetallic Heterogeneous Catalyst. J Am Chem Soc 2009; 131:13860-9. [DOI: 10.1021/ja905885z] [Citation(s) in RCA: 135] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Tatsuya Nitabaru
- Graduate School of Pharmaceutical Sciences, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan, and Process Chemistry, R&D, Kissei Pharmaceutical Company, Ltd., 197-5 Kamiyoshi, Kubiki-ku, Joetsu, Niigata 942-0145, Japan
| | - Akihiro Nojiri
- Graduate School of Pharmaceutical Sciences, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan, and Process Chemistry, R&D, Kissei Pharmaceutical Company, Ltd., 197-5 Kamiyoshi, Kubiki-ku, Joetsu, Niigata 942-0145, Japan
| | - Makoto Kobayashi
- Graduate School of Pharmaceutical Sciences, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan, and Process Chemistry, R&D, Kissei Pharmaceutical Company, Ltd., 197-5 Kamiyoshi, Kubiki-ku, Joetsu, Niigata 942-0145, Japan
| | - Naoya Kumagai
- Graduate School of Pharmaceutical Sciences, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan, and Process Chemistry, R&D, Kissei Pharmaceutical Company, Ltd., 197-5 Kamiyoshi, Kubiki-ku, Joetsu, Niigata 942-0145, Japan
| | - Masakatsu Shibasaki
- Graduate School of Pharmaceutical Sciences, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan, and Process Chemistry, R&D, Kissei Pharmaceutical Company, Ltd., 197-5 Kamiyoshi, Kubiki-ku, Joetsu, Niigata 942-0145, Japan
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42
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Liu X, Lin L, Feng X. Amide-based bifunctional organocatalysts in asymmetric reactions. Chem Commun (Camb) 2009:6145-58. [PMID: 19826653 DOI: 10.1039/b913411e] [Citation(s) in RCA: 181] [Impact Index Per Article: 12.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A series of amide-based bifunctional organocatalysts have been utilized in asymmetric reactions. Prolinamide analogues have been designed to catalyze asymmetric reactions via enamine intermediates with the assistance of tunable hydrogen bonding. In addition, the combination of various Lewis base functional groups, such as guanidine, N-oxide and phosphane, with an amide moiety have also constituted efficient bifunctional organocatalysts with unique reactivity and selectivity.
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Affiliation(s)
- Xiaohua Liu
- Key Laboratory of Green Chemistry & Technology, Ministry of Education, College of Chemistry, Sichuan University, Chengdu 610064, P. R. China
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43
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Wang F, Liu X, Zhang Y, Lin L, Feng X. Highly enantioselective synthesis of tertiary alcohols: C2-symmetric N,N′-dioxide-Sc(iii) complex promoted direct aldol reaction of α-ketoesters and diazoacetate esters. Chem Commun (Camb) 2009:7297-9. [DOI: 10.1039/b913520k] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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