51
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Affiliation(s)
- Manisha Bihani
- Department of Chemistry; University of Texas at San Antonio; One UTSA Circle San Antonio TX 78249-0698 USA
| | - John C.-G. Zhao
- Department of Chemistry; University of Texas at San Antonio; One UTSA Circle San Antonio TX 78249-0698 USA
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52
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Jia ZL, Wang Y, Xu GQ, Xu PF. Kinetic resolution via supramolecular iminium catalysis: multiactivation enables the asymmetric synthesis of β-aryl substituted aldehydes and densely functionalized cyclohexanes. Chem Commun (Camb) 2017; 53:4938-4941. [DOI: 10.1039/c7cc01625e] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A kinetic resolution affording enantioenriched β-aryl substituted aldehydes and densely functionalized cyclohexanes has been accomplished using a supramolecular iminium catalysis strategy.
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Affiliation(s)
- Zhi-Long Jia
- State Key Laboratory of Applied Organic Chemistry
- College of Chemistry and Chemical Engineering
- Lanzhou University
- Lanzhou 730000
- P. R. China
| | - Yao Wang
- School of Chemistry and Chemical Engineering
- Shandong University
- Jinan
- P. R. China
| | - Guo-Qiang Xu
- State Key Laboratory of Applied Organic Chemistry
- College of Chemistry and Chemical Engineering
- Lanzhou University
- Lanzhou 730000
- P. R. China
| | - Peng-Fei Xu
- State Key Laboratory of Applied Organic Chemistry
- College of Chemistry and Chemical Engineering
- Lanzhou University
- Lanzhou 730000
- P. R. China
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53
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Zhan G, Du W, Chen YC. Switchable divergent asymmetric synthesis via organocatalysis. Chem Soc Rev 2017; 46:1675-1692. [PMID: 28221384 DOI: 10.1039/c6cs00247a] [Citation(s) in RCA: 197] [Impact Index Per Article: 28.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
A variety of chiral organocatalysts, in addition to synergistic metal-based activation, were discussed in diverse switchable stereoselective reactions.
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Affiliation(s)
- Gu Zhan
- Department of Medicinal Chemistry
- West China School of Pharmacy
- Sichuan University
- Chengdu 610041
- China
| | - Wei Du
- Department of Medicinal Chemistry
- West China School of Pharmacy
- Sichuan University
- Chengdu 610041
- China
| | - Ying-Chun Chen
- Department of Medicinal Chemistry
- West China School of Pharmacy
- Sichuan University
- Chengdu 610041
- China
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54
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Wang J, Li J, Shen X, Dong C, Lin J, Wei K. Asymmetric total synthesis of (−)-δ-lycorane. Org Chem Front 2017. [DOI: 10.1039/c7qo00021a] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A first asymmetric synthesis of (−)-δ-lycorane by using a chiral bifunctional squaramide-catalysed cascade reaction is reported.
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Affiliation(s)
- Junliang Wang
- School of Chemical Science and Technology
- Yunnan University
- P. R. China
- School of Chemical Science and Technology
- Yunnan University
| | - Jianneng Li
- School of Chemical Science and Technology
- Yunnan University
- P. R. China
| | - Xianwang Shen
- School of Chemical Science and Technology
- Yunnan University
- P. R. China
| | - Cong Dong
- School of Chemical Science and Technology
- Yunnan University
- P. R. China
| | - Jun Lin
- School of Chemical Science and Technology
- Yunnan University
- P. R. China
- School of Chemical Science and Technology
- Yunnan University
| | - Kun Wei
- School of Chemical Science and Technology
- Yunnan University
- P. R. China
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55
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Li X, Huang W, Liu YQ, Kang JW, Xia D, He G, Peng C, Han B. Control of Activation Mode To Achieve Diastereodivergence in Asymmetric Syntheses of Chiral Spiropiperidinone Derivatives. J Org Chem 2016; 82:397-406. [PMID: 27936322 DOI: 10.1021/acs.joc.6b02489] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Affiliation(s)
- Xiang Li
- State Key Laboratory
Breeding Base of Systematic Research, Development and Utilization
of Chinese Medicine Resources, Chengdu University of Traditional Chinese Medicine, Chengdu 611137, People’s Republic of China
| | - Wei Huang
- State Key Laboratory
Breeding Base of Systematic Research, Development and Utilization
of Chinese Medicine Resources, Chengdu University of Traditional Chinese Medicine, Chengdu 611137, People’s Republic of China
| | - Yan-Qing Liu
- State Key Laboratory
Breeding Base of Systematic Research, Development and Utilization
of Chinese Medicine Resources, Chengdu University of Traditional Chinese Medicine, Chengdu 611137, People’s Republic of China
| | - Jing-Wen Kang
- State Key Laboratory
Breeding Base of Systematic Research, Development and Utilization
of Chinese Medicine Resources, Chengdu University of Traditional Chinese Medicine, Chengdu 611137, People’s Republic of China
| | - Dan Xia
- State Key Laboratory
Breeding Base of Systematic Research, Development and Utilization
of Chinese Medicine Resources, Chengdu University of Traditional Chinese Medicine, Chengdu 611137, People’s Republic of China
| | - Gu He
- State Key Laboratory of Biotherapy, West
China Hospital, Sichuan University, Chengdu 610041, People’s Republic of China
| | - Cheng Peng
- State Key Laboratory
Breeding Base of Systematic Research, Development and Utilization
of Chinese Medicine Resources, Chengdu University of Traditional Chinese Medicine, Chengdu 611137, People’s Republic of China
| | - Bo Han
- State Key Laboratory
Breeding Base of Systematic Research, Development and Utilization
of Chinese Medicine Resources, Chengdu University of Traditional Chinese Medicine, Chengdu 611137, People’s Republic of China
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56
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Misale A, Niyomchon S, Maulide N. Cyclobutenes: At a Crossroad between Diastereoselective Syntheses of Dienes and Unique Palladium-Catalyzed Asymmetric Allylic Substitutions. Acc Chem Res 2016; 49:2444-2458. [PMID: 27797480 DOI: 10.1021/acs.accounts.6b00375] [Citation(s) in RCA: 87] [Impact Index Per Article: 10.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
The rich chemistry of cyclobutanes is underpinned by a large body of synthetic literature devoted to their synthesis and decoration. This is motivated by the widespread representation of cyclobutane moieties in biologically active natural products and man-made molecules. Surprisingly, this vast array of knowledge finds no parallel in the chemistry of cyclobutenes, their unsaturated analogues. In particular, a dearth of methods to synthesize enantioenriched cyclobutenes is apparent upon cursory investigation of the literature. As a leading example, the photocycloaddition of maleic anhydride to acetylene or dichloroethylene, probably a benchmark of cyclobutene synthesis, delivers a meso cyclic anhydride which can be further converted to a cyclobutene product by enantioselective desymmetrization by ring opening. Nonetheless, such an approach delivers products with a rather inflexible substitution pattern around the four-membered ring. The lack of general approaches has motivated our group and others to develop novel routes to cyclobutene scaffolds, leading to the development of a strategy that combines photochemistry and catalysis. Indeed, we have coupled the simple and efficient photochemical isomerization of 2-pyrone into a strained bicyclo[2.2.0] lactone with palladium-catalyzed allylic alkylation as a simple and versatile access to functionalized cyclobutenes. Several nucleophiles can be added to the activated, strained intermediate, including malonate anions and azlactones. The products are mono- and bicyclic building blocks richly decorated with functional groups. Importantly, they are formed with high levels of diastereoselectivity as expected by the tenets of palladium-catalyzed allylic alkylation, which posit that the oxidative addition and nucleophilic capture steps proceed with inversion of configuration, resulting in overall retention (inversion + inversion). However, the transposition of the methodology to an asymmetric version subsequently led to the surprising discovery of a family of highly enantioselective, diastereodivergent catalytic processes. Indeed, we observed a ligand-dependent stereochemical outcome for a range of palladium-catalyzed allylic alkylations affording either overall retention or overall inversion of configuration, and that with very high levels of enantio- and diastereoselectivity. The new family of diastereodivergent reactions enables the conversion of the aforementioned racemic bicyclo[2.2.0] lactone into each of 4 stereoisomeric products, at will. Although the mechanistic details at the origin of this unusual stereodivergence are not yet fully elucidated, it became clear through our studies that unique Pd-allyl complexes, residing preferentially as their σ-(monohapto)-bound isomers, are at the heart of the process. The cyclobutenes prepared can also engage in electrocyclic ring-opening reactions (often spontaneous depending on the substitution pattern) that link this chemistry with that of diene and polyene frameworks. Using the strategies laid out above, our group was then able to harness the high stereospecificity of electrocyclic reactions and design modular syntheses of several natural products and natural product fragments. We believe that the methods presented herein shall soon pave the way for the streamlined synthesis of more complex polyenic natural products.
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Affiliation(s)
- Antonio Misale
- University of Vienna, Institute of Organic Chemistry, Währinger Straße 38, 1090 Vienna, Austria
| | - Supaporn Niyomchon
- University of Vienna, Institute of Organic Chemistry, Währinger Straße 38, 1090 Vienna, Austria
| | - Nuno Maulide
- University of Vienna, Institute of Organic Chemistry, Währinger Straße 38, 1090 Vienna, Austria
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57
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Poudel PP, Arimitsu K, Yamamoto K. Self-assembled ion-pair organocatalysis--asymmetric Baeyer-Villiger oxidation mediated by flavinium-cinchona alkaloid dimer. Chem Commun (Camb) 2016; 52:4163-6. [PMID: 26902149 DOI: 10.1039/c6cc00663a] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
An ion-pair catalyst generated by assembly of a chiral flavinium and a cinchona alkaloid dimer for use in asymmetric Baeyer-Villiger oxidation is presented. Ion-pair formation is essential for enhancing the catalytic activity and stereoselectivity. The catalyst is applicable to structurally diverse 3-substituted cyclobutanones, providing good to excellent enantioselectivities (up to 98 : 2 e.r.). This study provides the first example of self-assembly of a flavin derivative and a base to form a chiral reaction site that enables a highly stereoselective reaction to occur.
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Affiliation(s)
- Pramod Prasad Poudel
- Department of Chemistry and Biochemistry, University of Toledo, 2801 W. Bancroft St., Toledo, OH 43606, USA.
| | - Kenji Arimitsu
- Department of Chemistry and Biochemistry, University of Toledo, 2801 W. Bancroft St., Toledo, OH 43606, USA.
| | - Kana Yamamoto
- Department of Chemistry and Biochemistry, University of Toledo, 2801 W. Bancroft St., Toledo, OH 43606, USA.
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58
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Stereoselective reactions of nitro compounds in the synthesis of natural compound analogs and active pharmaceutical ingredients. Tetrahedron 2016. [DOI: 10.1016/j.tet.2016.07.067] [Citation(s) in RCA: 95] [Impact Index Per Article: 11.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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59
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Rong ZQ, Wang M, Chow CHE, Zhao Y. A Catalyst-Enabled Diastereodivergent Aza-Diels-Alder Reaction: Complementarity ofN-Heterocyclic Carbenes and Chiral Amines. Chemistry 2016; 22:9483-7. [DOI: 10.1002/chem.201601626] [Citation(s) in RCA: 86] [Impact Index Per Article: 10.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2016] [Indexed: 11/10/2022]
Affiliation(s)
- Zi-Qiang Rong
- Department of Chemistry; National University of Singapore; 3 Science Drive 3 Singapore 117543
| | - Min Wang
- Department of Chemistry; National University of Singapore; 3 Science Drive 3 Singapore 117543
| | - Chi Hao Eugene Chow
- Department of Chemistry; National University of Singapore; 3 Science Drive 3 Singapore 117543
| | - Yu Zhao
- Department of Chemistry; National University of Singapore; 3 Science Drive 3 Singapore 117543
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60
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Lapuerta I, Vera S, Oiarbide M, Palomo C. Development of a syn-Selective Mannich Reaction of Aldehydes with Propargylic Imines by Dual Catalysis: Asymmetric Synthesis of Functionalized Propargylic Amines. Chemistry 2016; 22:7229-37. [DOI: 10.1002/chem.201600635] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2016] [Indexed: 11/11/2022]
Affiliation(s)
- Irati Lapuerta
- Departamento de Química Orgánica I; Universidad del País Vasco UPV/EHU; Manuel Lardizabal 3 20018 San Sebastián Spain
| | - Silvia Vera
- Departamento de Química Orgánica I; Universidad del País Vasco UPV/EHU; Manuel Lardizabal 3 20018 San Sebastián Spain
| | - Mikel Oiarbide
- Departamento de Química Orgánica I; Universidad del País Vasco UPV/EHU; Manuel Lardizabal 3 20018 San Sebastián Spain
| | - Claudio Palomo
- Departamento de Química Orgánica I; Universidad del País Vasco UPV/EHU; Manuel Lardizabal 3 20018 San Sebastián Spain
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61
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Huang H, Konda S, Zhao JCG. Diastereodivergent Catalysis Using Modularly Designed Organocatalysts: Synthesis of bothcis- andtrans-Fused Pyrano[2,3-b]pyrans. Angew Chem Int Ed Engl 2016; 55:2213-6. [DOI: 10.1002/anie.201510134] [Citation(s) in RCA: 72] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2015] [Revised: 11/21/2015] [Indexed: 01/02/2023]
Affiliation(s)
- Huicai Huang
- Department of Chemistry; University of Texas at San Antonio; One UTSA Circle San Antonio TX 78249-0698 USA
| | - Swapna Konda
- Department of Chemistry; University of Texas at San Antonio; One UTSA Circle San Antonio TX 78249-0698 USA
| | - John C.-G. Zhao
- Department of Chemistry; University of Texas at San Antonio; One UTSA Circle San Antonio TX 78249-0698 USA
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62
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Zhan G, Shi ML, He Q, Lin WJ, Ouyang Q, Du W, Chen YC. Catalyst-Controlled Switch in Chemo- and Diastereoselectivities: Annulations of Morita-Baylis-Hillman Carbonates from Isatins. Angew Chem Int Ed Engl 2016; 55:2147-51. [PMID: 26755164 DOI: 10.1002/anie.201510825] [Citation(s) in RCA: 177] [Impact Index Per Article: 22.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/23/2015] [Revised: 12/08/2015] [Indexed: 02/05/2023]
Affiliation(s)
- Gu Zhan
- Key Laboratory of Drug Targeting and Drug Delivery System of the Ministry of Education; West China School of Pharmacy, and State Key Laboratory of Biotherapy; West China Hospital; Sichuan University; Chengdu 610041 China
| | - Ming-Lin Shi
- Key Laboratory of Drug Targeting and Drug Delivery System of the Ministry of Education; West China School of Pharmacy, and State Key Laboratory of Biotherapy; West China Hospital; Sichuan University; Chengdu 610041 China
| | - Qing He
- Key Laboratory of Drug Targeting and Drug Delivery System of the Ministry of Education; West China School of Pharmacy, and State Key Laboratory of Biotherapy; West China Hospital; Sichuan University; Chengdu 610041 China
| | - Wei-Jia Lin
- Key Laboratory of Drug Targeting and Drug Delivery System of the Ministry of Education; West China School of Pharmacy, and State Key Laboratory of Biotherapy; West China Hospital; Sichuan University; Chengdu 610041 China
| | - Qin Ouyang
- College of Pharmacy; Third Military Medical University; Chongqing 400038 China
| | - Wei Du
- Key Laboratory of Drug Targeting and Drug Delivery System of the Ministry of Education; West China School of Pharmacy, and State Key Laboratory of Biotherapy; West China Hospital; Sichuan University; Chengdu 610041 China
| | - Ying-Chun Chen
- Key Laboratory of Drug Targeting and Drug Delivery System of the Ministry of Education; West China School of Pharmacy, and State Key Laboratory of Biotherapy; West China Hospital; Sichuan University; Chengdu 610041 China
- College of Pharmacy; Third Military Medical University; Chongqing 400038 China
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63
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Zhan G, Shi ML, He Q, Lin WJ, Ouyang Q, Du W, Chen YC. Catalyst-Controlled Switch in Chemo- and Diastereoselectivities: Annulations of Morita-Baylis-Hillman Carbonates from Isatins. Angew Chem Int Ed Engl 2016. [DOI: 10.1002/ange.201510825] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Affiliation(s)
- Gu Zhan
- Key Laboratory of Drug Targeting and Drug Delivery System of the Ministry of Education; West China School of Pharmacy, and State Key Laboratory of Biotherapy; West China Hospital; Sichuan University; Chengdu 610041 China
| | - Ming-Lin Shi
- Key Laboratory of Drug Targeting and Drug Delivery System of the Ministry of Education; West China School of Pharmacy, and State Key Laboratory of Biotherapy; West China Hospital; Sichuan University; Chengdu 610041 China
| | - Qing He
- Key Laboratory of Drug Targeting and Drug Delivery System of the Ministry of Education; West China School of Pharmacy, and State Key Laboratory of Biotherapy; West China Hospital; Sichuan University; Chengdu 610041 China
| | - Wei-Jia Lin
- Key Laboratory of Drug Targeting and Drug Delivery System of the Ministry of Education; West China School of Pharmacy, and State Key Laboratory of Biotherapy; West China Hospital; Sichuan University; Chengdu 610041 China
| | - Qin Ouyang
- College of Pharmacy; Third Military Medical University; Chongqing 400038 China
| | - Wei Du
- Key Laboratory of Drug Targeting and Drug Delivery System of the Ministry of Education; West China School of Pharmacy, and State Key Laboratory of Biotherapy; West China Hospital; Sichuan University; Chengdu 610041 China
| | - Ying-Chun Chen
- Key Laboratory of Drug Targeting and Drug Delivery System of the Ministry of Education; West China School of Pharmacy, and State Key Laboratory of Biotherapy; West China Hospital; Sichuan University; Chengdu 610041 China
- College of Pharmacy; Third Military Medical University; Chongqing 400038 China
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64
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Huang H, Konda S, Zhao JCG. Diastereodivergent Catalysis Using Modularly Designed Organocatalysts: Synthesis of bothcis- andtrans-Fused Pyrano[2,3-b]pyrans. Angew Chem Int Ed Engl 2016. [DOI: 10.1002/ange.201510134] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Affiliation(s)
- Huicai Huang
- Department of Chemistry; University of Texas at San Antonio; One UTSA Circle San Antonio TX 78249-0698 USA
| | - Swapna Konda
- Department of Chemistry; University of Texas at San Antonio; One UTSA Circle San Antonio TX 78249-0698 USA
| | - John C.-G. Zhao
- Department of Chemistry; University of Texas at San Antonio; One UTSA Circle San Antonio TX 78249-0698 USA
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65
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Huang H, Bihani M, Zhao JCG. Stereoselective synthesis of spirooxindole derivatives using an organocatalyzed tandem Michael–Michael reaction. Org Biomol Chem 2016; 14:1755-63. [DOI: 10.1039/c5ob02348c] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A highly efficient and stereoselective method for the synthesis of functionalized spirooxindole derivatives was realized using enamine catalysis.
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Affiliation(s)
- Huicai Huang
- Department of Chemistry
- University of Texas at San Antonio
- San Antonio
- USA
| | - Manisha Bihani
- Department of Chemistry
- University of Texas at San Antonio
- San Antonio
- USA
| | - John C.-G. Zhao
- Department of Chemistry
- University of Texas at San Antonio
- San Antonio
- USA
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66
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Martínez JI, Uria U, Muñiz M, Reyes E, Carrillo L, Vicario JL. Organocatalytic and enantioselective Michael reaction between α-nitroesters and nitroalkenes. Syn/anti-selectivity control using catalysts with the same absolute backbone chirality. Beilstein J Org Chem 2015; 11:2577-83. [PMID: 26734103 PMCID: PMC4685793 DOI: 10.3762/bjoc.11.277] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2015] [Accepted: 12/02/2015] [Indexed: 11/23/2022] Open
Abstract
The asymmetric and catalytic Michael reaction between α-nitroesters and nitroalkenes has been studied in the presence of two bifunctional catalysts both containing the same absolute chirality at the carbon backbone. The reaction performed in similar conditions allows us to control the syn or anti selectivity of the Michael adduct obtaining good yields and high enantiocontrol in all cases.
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Affiliation(s)
- Jose I Martínez
- Department of Organic Chemistry II, University of the Basque Country (UPV/EHU), P.O. Box 644, 48080 Bilbao, Spain
| | - Uxue Uria
- Department of Organic Chemistry II, University of the Basque Country (UPV/EHU), P.O. Box 644, 48080 Bilbao, Spain
| | - Maria Muñiz
- Department of Organic Chemistry II, University of the Basque Country (UPV/EHU), P.O. Box 644, 48080 Bilbao, Spain
| | - Efraím Reyes
- Department of Organic Chemistry II, University of the Basque Country (UPV/EHU), P.O. Box 644, 48080 Bilbao, Spain
| | - Luisa Carrillo
- Department of Organic Chemistry II, University of the Basque Country (UPV/EHU), P.O. Box 644, 48080 Bilbao, Spain
| | - Jose L Vicario
- Department of Organic Chemistry II, University of the Basque Country (UPV/EHU), P.O. Box 644, 48080 Bilbao, Spain
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67
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Bhaskararao B, Sunoj RB. Origin of Stereodivergence in Cooperative Asymmetric Catalysis with Simultaneous Involvement of Two Chiral Catalysts. J Am Chem Soc 2015; 137:15712-22. [DOI: 10.1021/jacs.5b05902] [Citation(s) in RCA: 73] [Impact Index Per Article: 8.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Affiliation(s)
- Bangaru Bhaskararao
- Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai 400076, India
| | - Raghavan B. Sunoj
- Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai 400076, India
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68
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Novel approaches to pharmacology-oriented and energy rich organic nitrogen–oxygen systems. MENDELEEV COMMUNICATIONS 2015. [DOI: 10.1016/j.mencom.2015.11.001] [Citation(s) in RCA: 60] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
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69
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Ramachary DB, Shruthi KS, Madhavachary R. A Modularly Designed Supramolecular Organocatalyst as an Effective Stimulant for the Highly Asymmetric Michael Addition of Ketones to Nitro Olefins. European J Org Chem 2015. [DOI: 10.1002/ejoc.201500994] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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70
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Organocatalytic Enantioselective Synthesis of Polysubstituted Spirooxindoles using a Tandem Michael-Michael Reaction. Adv Synth Catal 2015. [DOI: 10.1002/adsc.201500298] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
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71
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Zhang YY, Gurubrahamam R, Chen K. Rauhut-Currier-Initiated Organocascade Reaction: Synthesis of Substituted Dispirocyclohexanes through a [2+2+2] Strategy Between 2-Arylideneindan-1,3-diones and Activated Alkenes. Adv Synth Catal 2015. [DOI: 10.1002/adsc.201500091] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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72
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Kenny R, Liu F. Trifunctional Organocatalysts: Catalytic Proficiency by Cooperative Activation. European J Org Chem 2015. [DOI: 10.1002/ejoc.201500179] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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73
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Martínez JI, Villar L, Uria U, Carrillo L, Reyes E, Vicario JL. Bifunctional Squaramide Catalysts with the Same Absolute Chirality for the Diastereodivergent Access to Densely Functionalised Cyclohexanes through Enantioselective Domino Reactions. Synthesis and Mechanistic Studies. Adv Synth Catal 2014. [DOI: 10.1002/adsc.201400502] [Citation(s) in RCA: 46] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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