101
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Pair E, Berini C, Noël R, Sanselme M, Levacher V, Brière JF. Organocatalysed multicomponent synthesis of pyrazolidinones: Meldrum's acid approach. Chem Commun (Camb) 2014; 50:10218-21. [DOI: 10.1039/c4cc04852k] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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102
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Nieto CT, Díez D, Garrido NM. To be or not to be butterfly: New mechanistic insights in the Aza-Michael asymmetric addition of lithium (R)-N-benzyl-N-(α-methylbenzyl)amide. J Comput Chem 2014; 35:1846-53. [PMID: 25052741 DOI: 10.1002/jcc.23694] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2014] [Revised: 07/07/2014] [Accepted: 07/09/2014] [Indexed: 11/08/2022]
Abstract
The asymmetric Aza-Michael addition of homochiral lithium benzylamides to α,β-unsaturated esters represents an extended protocol to obtain enantioenriched β-amino esters. An exhaustive mechanistic revision of the originally proposed mechanism is reported, developing a quantum mechanics/molecular mechanics protocol for the asymmetric Aza-Michael reaction of homochiral lithium benzylamides. Explicit and implicit solvent schemes were considered, together with a proper account of long-range dispersion forces, evaluated through a density functional theory benchmark of different functionals. Theoretical results showed that the diastereoselectivity is mainly controlled by the N-α-methylbenzyl moiety placing, deriving a Si/Re 99:1 diastereoselective ratio, in good agreement with reported experimental results. The main transition state geometries are two transition state conformers in a "V-stacked" orientation of the amide's phenyl rings, differing in the tetrahydrofuran molecule arrangement coordinated to the metal center. Extensive conformational sampling and quantum-level refinement give reasonable good speed/accuracy results, allowing this protocol to be extended to other similar Aza-Michael reaction systems.
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Affiliation(s)
- Carlos T Nieto
- Departamento de Química Orgánica, Universidad de Salamanca, Pza de la Merced 1-5, 37007, Salamanca, Spain
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103
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Wang Y, Ji S, Wei K, Lin J. Epiandrosterone-derived prolinamide as an efficient asymmetric catalyst for Michael addition reactions of aldehydes to nitroalkenes. RSC Adv 2014. [DOI: 10.1039/c4ra03075c] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022] Open
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104
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Akagawa K, Nishi N, Sen J, Kudo K. Peptide-catalyzed consecutive 1,6- and 1,4-additions of thiols to α,β,γ,δ-unsaturated aldehydes. Org Biomol Chem 2014; 12:3581-5. [PMID: 24769865 DOI: 10.1039/c4ob00565a] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
Regio- and enantioselective addition of thiols to α,β,γ,δ-unsaturated aldehydes was performed with a resin-supported peptide catalyst. It was shown that a 1,4-adduct was generated mainly at the initial stage of the reaction, and this was eventually converted to a thermodynamically stable 1,6- and 1,4-diadduct through retro-addition/addition reactions.
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Affiliation(s)
- Kengo Akagawa
- Institute of Industrial Science, University of Tokyo, 4-6-1 Komaba, Meguro-ku, Tokyo 153-8505, Japan.
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105
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Tao H, Duan J, Li P. Inorganic-Base-Catalysed Synthesis of α,β-Unsaturated Ketones and 3,5-Disubstituted Cyclohex-2-en-1-ones. ASIAN J ORG CHEM 2014. [DOI: 10.1002/ajoc.201400017] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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106
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Cheng S, Zhao L, Yu S. Enantioselective Synthesis of Azaflavanones Using Organocatalytic 6-endoAza-Michael Addition. Adv Synth Catal 2014. [DOI: 10.1002/adsc.201300920] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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107
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Žari S, Kudrjashova M, Pehk T, Lopp M, Kanger T. Remote Activation of the Nucleophilicity of Isatin. Org Lett 2014; 16:1740-3. [DOI: 10.1021/ol500421k] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Affiliation(s)
- Sergei Žari
- Department
of Chemistry, Tallinn University of Technology, Akadeemia tee 15, 12618 Tallinn, Estonia
| | - Marina Kudrjashova
- Department
of Chemistry, Tallinn University of Technology, Akadeemia tee 15, 12618 Tallinn, Estonia
| | - Tõnis Pehk
- National Institute of Chemical Physics and Biophysics, Akadeemia tee 23, 12618 Tallinn, Estonia
| | - Margus Lopp
- Department
of Chemistry, Tallinn University of Technology, Akadeemia tee 15, 12618 Tallinn, Estonia
| | - Tõnis Kanger
- Department
of Chemistry, Tallinn University of Technology, Akadeemia tee 15, 12618 Tallinn, Estonia
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108
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Lin H, Sun XW, Lin GQ. Dual-Organocatalyst-Promoted Asymmetric Cascade Reaction: Highly Efficient Construction of Enantiopure Fully Substituted Tetrahydro-1,2-oxazines. Org Lett 2014; 16:752-5. [DOI: 10.1021/ol403463h] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Affiliation(s)
- Hua Lin
- Department of Chemistry, Fudan University, 220 Handan Road, Shanghai, 200433, P. R. China
| | - Xing-Wen Sun
- Department of Chemistry, Fudan University, 220 Handan Road, Shanghai, 200433, P. R. China
| | - Guo-Qiang Lin
- Department of Chemistry, Fudan University, 220 Handan Road, Shanghai, 200433, P. R. China
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109
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110
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Noël R, Gembus V, Levacher V, Brière JF. Organocatalysed synthesis of isoxazolines initiated by a chemoselective oxa-Michael reaction of N-BocNHOH. Org Biomol Chem 2014; 12:1245-9. [DOI: 10.1039/c3ob42406e] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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111
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Nakajima K, Kitagawa M, Ashida Y, Miyake Y, Nishibayashi Y. Synthesis of nitrogen heterocycles via α-aminoalkyl radicals generated from α-silyl secondary amines under visible light irradiation. Chem Commun (Camb) 2014; 50:8900-3. [DOI: 10.1039/c4cc03000a] [Citation(s) in RCA: 48] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We have succeeded in the visible light-mediated synthetic use of α-aminoalkyl radicals derived from α-silyl secondary amines toward addition to α,β-unsaturated carbonyl compounds. The resulting γ-aminocarbonyl compounds are converted into γ-lactams and pyrroles in a one-pot process.
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Affiliation(s)
- Kazunari Nakajima
- Institute of Engineering Innovation
- School of Engineering
- The University of Tokyo
- Tokyo, Japan
| | - Mai Kitagawa
- Institute of Engineering Innovation
- School of Engineering
- The University of Tokyo
- Tokyo, Japan
| | - Yuya Ashida
- Institute of Engineering Innovation
- School of Engineering
- The University of Tokyo
- Tokyo, Japan
| | - Yoshihiro Miyake
- Institute of Engineering Innovation
- School of Engineering
- The University of Tokyo
- Tokyo, Japan
| | - Yoshiaki Nishibayashi
- Institute of Engineering Innovation
- School of Engineering
- The University of Tokyo
- Tokyo, Japan
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112
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Duan J, Li P. Asymmetric organocatalysis mediated by primary amines derived from cinchona alkaloids: recent advances. Catal Sci Technol 2014. [DOI: 10.1039/c3cy00739a] [Citation(s) in RCA: 86] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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113
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Guo J, Sun X, Yu S. Diastereoselective synthesis of epoxide-fused benzoquinolizidine derivatives using intramolecular domino aza-Michael addition/Darzens reaction. Org Biomol Chem 2014; 12:265-8. [DOI: 10.1039/c3ob42068j] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Affiliation(s)
- Jiajia Guo
- State Key Laboratory of Analytical Chemistry for Life Science, Institute of Chemical Biology and Drug Innovation, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210093, China.
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114
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Sánchez-Roselló M, Aceña JL, Simón-Fuentes A, del Pozo C. A general overview of the organocatalytic intramolecular aza-Michael reaction. Chem Soc Rev 2014; 43:7430-53. [DOI: 10.1039/c4cs00156g] [Citation(s) in RCA: 140] [Impact Index Per Article: 14.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
The organocatalytic intramolecular aza-Michael reaction: a useful strategy to generate enantiomerically enriched nitrogen-containing heterocycles.
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Affiliation(s)
- María Sánchez-Roselló
- Departamento de Química Orgánica
- Universidad de Valencia
- E-46100-Burjassot, Spain
- Laboratorio de Moléculas Orgánicas
- Centro de Investigación Principe Felipe
| | - José Luis Aceña
- Departamento de Química Orgánica I
- Universidad del País Vasco UPV/EHU
- San Sebastián, Spain
| | | | - Carlos del Pozo
- Departamento de Química Orgánica
- Universidad de Valencia
- E-46100-Burjassot, Spain
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115
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Alcaine A, Marqués-López E, Herrera RP. Synthesis of interesting β-nitrohydrazides through a thiourea organocatalysed aza-Michael addition. RSC Adv 2014. [DOI: 10.1039/c3ra47925k] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
The synthesis of interesting β-nitrohydrazides, as the target product of our reaction, is reached for the first time under organocatalytic enantioselective conditions.
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Affiliation(s)
- Ana Alcaine
- Laboratorio de Síntesis Asimétrica
- Departamento de Química Orgánica
- Instituto de Síntesis Química y Catálisis Homogénea (ISQCH)
- CSIC-Universidad de Zaragoza
- E-50009 Zaragoza, Spain
| | - Eugenia Marqués-López
- Laboratorio de Síntesis Asimétrica
- Departamento de Química Orgánica
- Instituto de Síntesis Química y Catálisis Homogénea (ISQCH)
- CSIC-Universidad de Zaragoza
- E-50009 Zaragoza, Spain
| | - Raquel P. Herrera
- Laboratorio de Síntesis Asimétrica
- Departamento de Química Orgánica
- Instituto de Síntesis Química y Catálisis Homogénea (ISQCH)
- CSIC-Universidad de Zaragoza
- E-50009 Zaragoza, Spain
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116
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Durmaz M, Sirit A. Calixarene-based chiral primary amine thiourea promoted highly enantioselective asymmetric Michael reactions of α,α-disubstituted aldehydes with maleimides. ACTA ACUST UNITED AC 2013. [DOI: 10.1016/j.tetasy.2013.09.010] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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117
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Guang J, Zhao JCG. Organocatalyzed asymmetric Michael reaction of β-aryl-α-ketophosphonates and nitroalkenes. Tetrahedron Lett 2013; 54. [PMID: 24187390 DOI: 10.1016/j.tetlet.2013.08.015] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
The first enantioselective Michael reaction of β-aryl-α-ketophosphonates and nitroalkenes has been brealized by using a new bifunctional Takemoto-type thiourea catalyst. The primary Michael adducts obtained were converted in situ to the corresponding amides through the aminolysis. High yields, excellent diastereoselectivities (>95:5 dr), and good enantioselectivities (up to 81% ee) have been achieved for the corresponding α ,β-disubstituted γ-nitroamides. This reaction againdemon strated that α-ketophosphonates are interesting pronucleophiles that can be used as amide surrogates in organocatalyzed reactions.
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Affiliation(s)
- Jie Guang
- Department of Chemistry, University of Texas at San Antonio, One UTSA Circle, San Antonio, Texas 78249-0689, United States
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118
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Lee HJ, Cho CW. Asymmetric Synthesis of Chiral Pyrrolizine-Based Triheterocycles by Organocatalytic Cascade Aza-Michael-Aldol Reactions. European J Org Chem 2013. [DOI: 10.1002/ejoc.201301260] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
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119
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Scheffler U, Mahrwald R. Recent Advances in Organocatalytic Methods for Asymmetric CC Bond Formation. Chemistry 2013; 19:14346-96. [DOI: 10.1002/chem.201301996] [Citation(s) in RCA: 178] [Impact Index Per Article: 16.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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120
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Ghosh SC, Ngiam JS, Seayad AM, Tuan DT, Johannes CW, Chen A. Tandem oxidative amidation of benzyl alcohols with amine hydrochloride salts catalysed by iron nitrate. Tetrahedron Lett 2013. [DOI: 10.1016/j.tetlet.2013.07.005] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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121
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Ghosh AK, Zhou B. Bifunctional cinchona alkaloid-squaramide-catalyzed highly enantioselective aza-Michael addition of indolines to α,β-unsaturated ketones. Tetrahedron Lett 2013; 54:3500-3502. [PMID: 24014895 PMCID: PMC3763959 DOI: 10.1016/j.tetlet.2013.04.080] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Abstract
An enantioselective aza-Michael addition of indolines to α,β-unsaturated ketones was achieved using a bifunctional cinchona alkaloid-derived chiral squaramide derivative. Various β-indolinyl ketone derivatives were obtained in good to excellent yields and with high enantioselectivity. DDQ or MnO2 oxidation of indoline derivatives provided convenient access to various enantioenriched N-substituted indole derivatives.
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Affiliation(s)
- Arun K. Ghosh
- Department of Chemistry and Medicinal Chemistry, Purdue University, 560 Oval Drive, West Lafayette, IN 47907, United States
| | - Bing Zhou
- Department of Chemistry and Medicinal Chemistry, Purdue University, 560 Oval Drive, West Lafayette, IN 47907, United States
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122
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Enders D, Joie C, Deckers K. Organocatalytic Asymmetric Synthesis of Tetracyclic Pyridocarbazole Derivatives by Using a Diels-Alder/aza-Michael/Aldol Condensation Domino Reaction. Chemistry 2013; 19:10818-21. [DOI: 10.1002/chem.201302127] [Citation(s) in RCA: 72] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2013] [Indexed: 11/10/2022]
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123
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Silvi M, Renzi P, Rosato D, Margarita C, Vecchioni A, Bordacchini I, Morra D, Nicolosi A, Cari R, Sciubba F, Scarpino Schietroma DM, Bella M. Enantioselective aza-Michael addition of imides by using an integrated strategy involving the synthesis of a family of multifunctional catalysts, usage of multiple catalysis, and rational design of experiment. Chemistry 2013; 19:9973-8. [PMID: 23765568 DOI: 10.1002/chem.201301493] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2013] [Indexed: 11/07/2022]
Abstract
A challenging asymmetric reaction (aza-Michael addition of imides to enones) has been optimized through an integrated approach involving the synthesis of a family of organocatalysts, multiple catalysis (usage of additives), and finally with rational exploration of the chemical space by the application of the experiment design.
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Affiliation(s)
- Mattia Silvi
- Department of Chemistry, Sapienza University of Roma, P.le Aldo Moro 5, 00185 Roma, Italy
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124
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Calow ADJ, Solé C, Whiting A, Fernández E. Base-Free β-Boration of α,β-Unsaturated Imines Catalysed by Cu2O with Concurrent Enhancement of Asymmetric Induction. ChemCatChem 2013. [DOI: 10.1002/cctc.201300113] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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125
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Yamamoto Y, Nasu H, Tomioka K. NMR studies on the structure of a lithium amide–chiral diether complex for an asymmetric reaction. Tetrahedron 2013. [DOI: 10.1016/j.tet.2013.03.036] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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126
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Iida H, Tang Z, Yashima E. Synthesis and bifunctional asymmetric organocatalysis of helical poly(phenylacetylene)s bearing cinchona alkaloid pendants via a sulfonamide linkage. ACTA ACUST UNITED AC 2013. [DOI: 10.1002/pola.26678] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Affiliation(s)
- Hiroki Iida
- Department of Molecular Design and Engineering; Graduate School of Engineering; Nagoya University; Nagoya 464-8603 Japan
| | - Zhenglin Tang
- Department of Molecular Design and Engineering; Graduate School of Engineering; Nagoya University; Nagoya 464-8603 Japan
| | - Eiji Yashima
- Department of Molecular Design and Engineering; Graduate School of Engineering; Nagoya University; Nagoya 464-8603 Japan
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127
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Pou A, Moyano A. Stereoselective Organocatalytic Approach to α,β-Disubstituted-β-amino Acids: A Short Enantioselective Synthesis of Cispentacin. European J Org Chem 2013. [DOI: 10.1002/ejoc.201300197] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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128
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129
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Lee HJ, Cho CW. Cinchona-Based Primary Amine-Catalyzed Asymmetric Cascade Aza-Michael–Aldol Reactions of Enones with 2-(1H-Pyrrol-2-yl)-2-oxoacetates: Synthesis of Chiral Pyrrolizines with Multistereocenters. J Org Chem 2013; 78:3306-12. [DOI: 10.1021/jo4001614] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Affiliation(s)
- Hyo-Jun Lee
- Department of Chemistry, Kyungpook National University, Daegu 702-701, Republic of Korea
| | - Chang-Woo Cho
- Department of Chemistry, Kyungpook National University, Daegu 702-701, Republic of Korea
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130
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Zeng X, Ni Q, Raabe G, Enders D. Eine verzweigte Dominoreaktion: asymmetrische, organokatalytische Zwei-Komponenten-vier-Stufen-Synthese hochfunktionalisierter Cyclohexenderivate. Angew Chem Int Ed Engl 2013. [DOI: 10.1002/ange.201209581] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
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131
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Zeng X, Ni Q, Raabe G, Enders D. A branched domino reaction: asymmetric organocatalytic two-component four-step synthesis of polyfunctionalized cyclohexene derivatives. Angew Chem Int Ed Engl 2013; 52:2977-80. [PMID: 23355486 DOI: 10.1002/anie.201209581] [Citation(s) in RCA: 96] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2012] [Indexed: 01/04/2023]
Affiliation(s)
- Xiaofei Zeng
- Institute of Organic Chemistry, RWTH Aachen University, Landoltweg 1, 52074 Aachen, Germany
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132
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Wu L, Li G, Fu Q, Yu L, Tang Z. Organocatalytic asymmetric Michael reaction with acylsilane donors. Org Biomol Chem 2013; 11:443-7. [DOI: 10.1039/c2ob26950c] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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133
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Miyatake-Ondozabal H, Bannwart LM, Gademann K. Enantioselective total synthesis of virosaine A and bubbialidine. Chem Commun (Camb) 2013; 49:1921-3. [DOI: 10.1039/c3cc38783f] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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134
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Liu H, Zeng C, Guo J, Zhang M, Yu S. Enantioselective synthesis of 2-substituted pyrrolidinesvia domino cross metathesis/intramolecular aza-Michael addition. RSC Adv 2013. [DOI: 10.1039/c2ra22374k] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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135
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Wu H, Tian Z, Zhang L, Huang Y, Wang Y. Organocatalytic Enantioselective Aza-Michael Addition of Purine Bases to α,β-Unsaturated Ketones. Adv Synth Catal 2012. [DOI: 10.1002/adsc.201200488] [Citation(s) in RCA: 24] [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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136
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Wang J, Li PF, Chan SH, Chan AS, Kwong FY. Catalyst-free aza-Michael addition of azole to β,γ-unsaturated-α-keto ester: an efficient access to C–N bond formation. Tetrahedron Lett 2012. [DOI: 10.1016/j.tetlet.2012.03.132] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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