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Curti C, Battistini L, Sartori A, Zanardi F. New Developments of the Principle of Vinylogy as Applied to π-Extended Enolate-Type Donor Systems. Chem Rev 2020; 120:2448-2612. [PMID: 32040305 PMCID: PMC7993750 DOI: 10.1021/acs.chemrev.9b00481] [Citation(s) in RCA: 99] [Impact Index Per Article: 24.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2019] [Indexed: 12/19/2022]
Abstract
The principle of vinylogy states that the electronic effects of a functional group in a molecule are possibly transmitted to a distal position through interposed conjugated multiple bonds. As an emblematic case, the nucleophilic character of a π-extended enolate-type chain system may be relayed from the legitimate α-site to the vinylogous γ, ε, ..., ω remote carbon sites along the chain, provided that suitable HOMO-raising strategies are adopted to transform the unsaturated pronucleophilic precursors into the reactive polyenolate species. On the other hand, when "unnatural" carbonyl ipso-sites are activated as nucleophiles (umpolung), vinylogation extends the nucleophilic character to "unnatural" β, δ, ... remote sites. Merging the principle of vinylogy with activation modalities and concepts such as iminium ion/enamine organocatalysis, NHC-organocatalysis, cooperative organo/metal catalysis, bifunctional organocatalysis, dicyanoalkylidene activation, and organocascade reactions represents an impressive step forward for all vinylogous transformations. This review article celebrates this evolutionary progress, by collecting, comparing, and critically describing the achievements made over the nine year period 2010-2018, in the generation of vinylogous enolate-type donor substrates and their use in chemical synthesis.
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Affiliation(s)
| | | | | | - Franca Zanardi
- Dipartimento di Scienze degli
Alimenti e del Farmaco, Università
di Parma, Parco Area delle Scienze 27A, 43124 Parma, Italy
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2
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Fulton JL, Horwitz MA, Bruske EL, Johnson JS. Asymmetric Organocatalytic Sulfa-Michael Addition to Enone Diesters. J Org Chem 2018; 83:3385-3391. [PMID: 29512387 DOI: 10.1021/acs.joc.8b00007] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
An asymmetric sulfa-Michael addition of alkyl thiols to enone diesters is reported. The reaction is catalyzed by a bifunctional triaryliminophosphorane-thiourea organocatalyst and provides a range of α-sulfaketones in high yields and enantioselectivities. Leveraging the gem-diester functional handle via a subsequent diastereotopic group discrimination generates functionalized lactones with three contiguous stereocenters.
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Affiliation(s)
- Jennifer L Fulton
- Department of Chemistry , University of North Carolina at Chapel Hill , Chapel Hill , North Carolina 27599-3290 , United States
| | - Matthew A Horwitz
- Department of Chemistry , University of North Carolina at Chapel Hill , Chapel Hill , North Carolina 27599-3290 , United States
| | - Ericka L Bruske
- Department of Chemistry , University of North Carolina at Chapel Hill , Chapel Hill , North Carolina 27599-3290 , United States
| | - Jeffrey S Johnson
- Department of Chemistry , University of North Carolina at Chapel Hill , Chapel Hill , North Carolina 27599-3290 , United States
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3
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Wei Q, Hou W, Liao N, Peng Y. Enantioselective Sulfa-Michael Addition of Aromatic Thiols to β-Substituted Nitroalkenes Promoted by a Chiral Multifunctional Catalyst. Adv Synth Catal 2017. [DOI: 10.1002/adsc.201700109] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Qi Wei
- Key Laboratory of Applied Chemistry of Chongqing Municipality; School of Chemistry and Chemical Engineering; Southwest University; Chongqing 400715 People's Republic of China
| | - Wenduan Hou
- Key Laboratory of Applied Chemistry of Chongqing Municipality; School of Chemistry and Chemical Engineering; Southwest University; Chongqing 400715 People's Republic of China
| | - Na Liao
- Key Laboratory of Applied Chemistry of Chongqing Municipality; School of Chemistry and Chemical Engineering; Southwest University; Chongqing 400715 People's Republic of China
| | - Yungui Peng
- Key Laboratory of Applied Chemistry of Chongqing Municipality; School of Chemistry and Chemical Engineering; Southwest University; Chongqing 400715 People's Republic of China
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4
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Zhu B, Qiu S, Li J, Coote ML, Lee R, Jiang Z. Asymmetric [4 + 2] annulation of 5 H-thiazol-4-ones with a chiral dipeptide-based Brønsted base catalyst. Chem Sci 2016; 7:6060-6067. [PMID: 30034746 PMCID: PMC6022207 DOI: 10.1039/c6sc02039a] [Citation(s) in RCA: 42] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2016] [Accepted: 06/08/2016] [Indexed: 12/26/2022] Open
Abstract
Versatile synthetic strategies that access diverse chemical substrates in a highly chemo- and stereo-selective manner are crucial but demanding. Construction of chiral molecules with multiple (hetero)-quaternary carbon stereocenters in a single fashion is a particularly significant challenge, with important applications in the synthesis of a range of bioactive compounds containing the 1,4-sulfur bridged piperidinone structural motif. The asymmetric synthesis of these entities is complicated due to the need to build at least two hetero-quaternary stereocenters concurrently. In order to achieve this, we have developed a new family of dipeptide-based multifunctional Brønsted base organocatalysts that are highly capable of the first asymmetric [4 + 2] annulation reaction of 5H-thiazol-4-ones with electron-deficient alkenes. This protocol could be applied to a series of alkenes such as nitroalkenes, 4-oxo-4-arylbutenones, 4-oxo-4-arylbutenoates and methyleneindolinones, providing an efficient approach to valuable chiral 1,4-sulfur bridged piperidinones and their derivatives with multiple hetereo-quaternary stereogenic centers in high yields and enantioselectivities. Density functional theory studies involving 5H-thiazol-4-one and nitroolefin catalysis propose stereochemical insights into the origin of enantio- and chemo-selectivity.
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Affiliation(s)
- Bo Zhu
- Key Laboratory of Natural Medicine and Immuno-Engineering of Henan Province , Henan University , Kaifeng , Henan , People's Republic of China .
| | - Shuai Qiu
- Key Laboratory of Natural Medicine and Immuno-Engineering of Henan Province , Henan University , Kaifeng , Henan , People's Republic of China .
| | - Jiangtao Li
- Key Laboratory of Natural Medicine and Immuno-Engineering of Henan Province , Henan University , Kaifeng , Henan , People's Republic of China .
| | - Michelle L Coote
- ARC Centre of Excellence for Electromaterials Science , Research School of Chemistry , Australian National University , Canberra ACT 2601 , Australia .
| | - Richmond Lee
- ARC Centre of Excellence for Electromaterials Science , Research School of Chemistry , Australian National University , Canberra ACT 2601 , Australia .
| | - Zhiyong Jiang
- Key Laboratory of Natural Medicine and Immuno-Engineering of Henan Province , Henan University , Kaifeng , Henan , People's Republic of China .
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5
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Ding X, Tian C, Hu Y, Gong L, Meggers E. Tuning the Basicity of a Metal-Templated Brønsted Base to Facilitate the Enantioselective Sulfa-Michael Addition of Aliphatic Thiols to α,β-UnsaturatedN-Acylpyrazoles. European J Org Chem 2016. [DOI: 10.1002/ejoc.201501494] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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6
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Zhou W, Su X, Tao M, Zhu C, Zhao Q, Zhang J. Chiral Sulfinamide Bisphosphine Catalysts: Design, Synthesis, and Application in Highly Enantioselective Intermolecular Cross‐Rauhut–Currier Reactions. Angew Chem Int Ed Engl 2015; 54:14853-7. [DOI: 10.1002/anie.201508108] [Citation(s) in RCA: 93] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2015] [Indexed: 01/01/2023]
Affiliation(s)
- Wei Zhou
- Shanghai Key Laboratory of Green Chemistry and Chemical Processes, School of Chemistry and Molecular Engineering, East China Normal University, Shanghai, 200062 (P. R. China) http://faculty.ecnu.edu.cn/s/1811/main.jspy
| | - Xiao Su
- Shanghai Key Laboratory of Green Chemistry and Chemical Processes, School of Chemistry and Molecular Engineering, East China Normal University, Shanghai, 200062 (P. R. China) http://faculty.ecnu.edu.cn/s/1811/main.jspy
| | - Mengna Tao
- Shanghai Key Laboratory of Green Chemistry and Chemical Processes, School of Chemistry and Molecular Engineering, East China Normal University, Shanghai, 200062 (P. R. China) http://faculty.ecnu.edu.cn/s/1811/main.jspy
| | - Chaoze Zhu
- Shanghai Key Laboratory of Green Chemistry and Chemical Processes, School of Chemistry and Molecular Engineering, East China Normal University, Shanghai, 200062 (P. R. China) http://faculty.ecnu.edu.cn/s/1811/main.jspy
| | - Qingjie Zhao
- Shanghai Key Laboratory of Green Chemistry and Chemical Processes, School of Chemistry and Molecular Engineering, East China Normal University, Shanghai, 200062 (P. R. China) http://faculty.ecnu.edu.cn/s/1811/main.jspy
- Department of Organic Chemistry, School of Pharmacy, Second Military Medical University, Shanghai, 200433 (P. R. China)
| | - Junliang Zhang
- Shanghai Key Laboratory of Green Chemistry and Chemical Processes, School of Chemistry and Molecular Engineering, East China Normal University, Shanghai, 200062 (P. R. China) http://faculty.ecnu.edu.cn/s/1811/main.jspy
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7
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Chiral Sulfinamide Bisphosphine Catalysts: Design, Synthesis, and Application in Highly Enantioselective Intermolecular Cross‐Rauhut–Currier Reactions. Angew Chem Int Ed Engl 2015. [DOI: 10.1002/ange.201508108] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
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8
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Breman AC, Telderman SEM, van Santen RPM, Scott JI, van Maarseveen JH, Ingemann S, Hiemstra H. Cinchona Alkaloid Catalyzed Sulfa-Michael Addition Reactions Leading to Enantiopure β-Functionalized Cysteines. J Org Chem 2015; 80:10561-74. [DOI: 10.1021/acs.joc.5b01660] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Arjen C. Breman
- Van’t Hoff Institute
for Molecular Sciences, Faculty of Science, The University of Amsterdam, Science Park 904, 1098 XH Amsterdam, The Netherlands
| | - Suze E. M. Telderman
- Van’t Hoff Institute
for Molecular Sciences, Faculty of Science, The University of Amsterdam, Science Park 904, 1098 XH Amsterdam, The Netherlands
| | - Roy P. M. van Santen
- Van’t Hoff Institute
for Molecular Sciences, Faculty of Science, The University of Amsterdam, Science Park 904, 1098 XH Amsterdam, The Netherlands
| | - Jamie I. Scott
- Van’t Hoff Institute
for Molecular Sciences, Faculty of Science, The University of Amsterdam, Science Park 904, 1098 XH Amsterdam, The Netherlands
| | - Jan H. van Maarseveen
- Van’t Hoff Institute
for Molecular Sciences, Faculty of Science, The University of Amsterdam, Science Park 904, 1098 XH Amsterdam, The Netherlands
| | - Steen Ingemann
- Van’t Hoff Institute
for Molecular Sciences, Faculty of Science, The University of Amsterdam, Science Park 904, 1098 XH Amsterdam, The Netherlands
| | - Henk Hiemstra
- Van’t Hoff Institute
for Molecular Sciences, Faculty of Science, The University of Amsterdam, Science Park 904, 1098 XH Amsterdam, The Netherlands
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9
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Ding R, Zheng B, Wang Y, Peng Y. A Cation-Directed Enantioselective Sulfur-Mediated Michael/Mannich Three-Component Domino Reaction involving Chalcones as Michael Acceptors. Org Lett 2015; 17:4128-31. [DOI: 10.1021/acs.orglett.5b01833] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Ran Ding
- Key Laboratory of Applied
Chemistry of Chongqing Municipality, School of Chemistry and Chemical
Engineering, Southwest University, Chongqing 400715, China
| | - Bo Zheng
- Key Laboratory of Applied
Chemistry of Chongqing Municipality, School of Chemistry and Chemical
Engineering, Southwest University, Chongqing 400715, China
| | - Yan Wang
- Key Laboratory of Applied
Chemistry of Chongqing Municipality, School of Chemistry and Chemical
Engineering, Southwest University, Chongqing 400715, China
| | - Yungui Peng
- Key Laboratory of Applied
Chemistry of Chongqing Municipality, School of Chemistry and Chemical
Engineering, Southwest University, Chongqing 400715, China
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10
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Servín FA, Madrigal D, Romero JA, Chávez D, Aguirre G, Anaya de Parrodi C, Somanathan R. Synthesis of C2-symmetric 1,2-diamine-functionalized organocatalysts: mimicking enzymes in enantioselective Michael addition reactions. Tetrahedron Lett 2015. [DOI: 10.1016/j.tetlet.2015.03.125] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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11
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Ding X, Lin H, Gong L, Meggers E. Enantioselective Sulfa-Michael Addition to α,β-Unsaturated γ-Oxoesters Catalyzed by a Metal-Templated Chiral Brønsted Base. ASIAN J ORG CHEM 2015. [DOI: 10.1002/ajoc.201500033] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
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12
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13
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Kowalczyk R, Wierzba AJ, Boratyński PJ, Bąkowicz J. Enantioselective conjugate addition of aliphatic thiols to divergently activated electron poor alkenes and dienes. Tetrahedron 2014. [DOI: 10.1016/j.tet.2014.06.035] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
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14
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Chauhan P, Mahajan S, Enders D. Organocatalytic carbon-sulfur bond-forming reactions. Chem Rev 2014; 114:8807-64. [PMID: 25144663 DOI: 10.1021/cr500235v] [Citation(s) in RCA: 451] [Impact Index Per Article: 45.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Affiliation(s)
- Pankaj Chauhan
- Institute of Organic Chemistry, RWTH Aachen University Landoltweg 1 , 52074 Aachen, Germany
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15
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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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16
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Chen W, Jing Z, Chin KF, Qiao B, Zhao Y, Yan L, Tan CH, Jiang Z. Catalytic Asymmetric Conjugate Addition of Mercaptans to β-Substituted-β-Trifluoromethyl Oxazolidinone Enoates: Access to Chiral Trifluoromethylated Tertiary Thioethers and Thiols. Adv Synth Catal 2014. [DOI: 10.1002/adsc.201301027] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
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17
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Qiao B, Liu X, Duan S, Yan L, Jiang Z. Highly Enantioselective Organocatalytic α-Sulfenylation of Azlactones. Org Lett 2014; 16:672-5. [PMID: 24432722 DOI: 10.1021/ol403303k] [Citation(s) in RCA: 58] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Affiliation(s)
- Baokun Qiao
- Institute of Chemical Biology and ‡Key Laboratory of Natural Medicine
and Immuno-Engineering
of Henan Province, Henan University, Kaifeng, Henan, China, 475004
| | - Xinfei Liu
- Institute of Chemical Biology and ‡Key Laboratory of Natural Medicine
and Immuno-Engineering
of Henan Province, Henan University, Kaifeng, Henan, China, 475004
| | - Shaobo Duan
- Institute of Chemical Biology and ‡Key Laboratory of Natural Medicine
and Immuno-Engineering
of Henan Province, Henan University, Kaifeng, Henan, China, 475004
| | - Lin Yan
- Institute of Chemical Biology and ‡Key Laboratory of Natural Medicine
and Immuno-Engineering
of Henan Province, Henan University, Kaifeng, Henan, China, 475004
| | - Zhiyong Jiang
- Institute of Chemical Biology and ‡Key Laboratory of Natural Medicine
and Immuno-Engineering
of Henan Province, Henan University, Kaifeng, Henan, China, 475004
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18
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Han Z, Yang W, Tan CH, Jiang Z. Organocatalytic Asymmetric Mannich Reactions of 5H-Oxazol-4-ones: Highly Enantio- and Diastereoselective Synthesis of Chiral α-Alkylisoserine Derivatives. Adv Synth Catal 2013. [DOI: 10.1002/adsc.201300135] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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19
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Organocatalytic enantioselective transient enolate protonation in conjugate addition of thioacetic acid to α-substituted N-acryloyloxazolidinones. Tetrahedron Lett 2013. [DOI: 10.1016/j.tetlet.2013.01.004] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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20
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Kowalczyk R, Nowak AE, Skarżewski J. Organocatalytic asymmetric addition of aliphatic thiols to nitro olefins and nitrodienes. ACTA ACUST UNITED AC 2013. [DOI: 10.1016/j.tetasy.2013.03.007] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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21
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Zhang W, Tan D, Lee R, Tong G, Chen W, Qi B, Huang KW, Tan CH, Jiang Z. Highly Enantio- and Diastereoselective Reactions of γ-Substituted Butenolides Through Direct Vinylogous Conjugate Additions. Angew Chem Int Ed Engl 2012. [DOI: 10.1002/ange.201205872] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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22
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Zhang W, Tan D, Lee R, Tong G, Chen W, Qi B, Huang KW, Tan CH, Jiang Z. Highly Enantio- and Diastereoselective Reactions of γ-Substituted Butenolides Through Direct Vinylogous Conjugate Additions. Angew Chem Int Ed Engl 2012; 51:10069-73. [DOI: 10.1002/anie.201205872] [Citation(s) in RCA: 120] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2012] [Indexed: 11/11/2022]
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23
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Han Z, Chen W, Dong S, Yang C, Liu H, Pan Y, Yan L, Jiang Z. Highly Enantioselective Organocatalytic Sulfenylation of 3-Aryloxindoles. Org Lett 2012; 14:4670-3. [DOI: 10.1021/ol3021176] [Citation(s) in RCA: 60] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Zhiqiang Han
- Institute of Chemical Biology and Key Laboratory of Natural Medicine and Immuno-Engineering of Henan Province, Henan University, Kaifeng, Henan, People’s Republic of China 475004, and Department of Chemistry, National University of Singapore, 3 Science Drive 3, Singapore 117543
| | - Wenchao Chen
- Institute of Chemical Biology and Key Laboratory of Natural Medicine and Immuno-Engineering of Henan Province, Henan University, Kaifeng, Henan, People’s Republic of China 475004, and Department of Chemistry, National University of Singapore, 3 Science Drive 3, Singapore 117543
| | - Sheng Dong
- Institute of Chemical Biology and Key Laboratory of Natural Medicine and Immuno-Engineering of Henan Province, Henan University, Kaifeng, Henan, People’s Republic of China 475004, and Department of Chemistry, National University of Singapore, 3 Science Drive 3, Singapore 117543
| | - Caiyun Yang
- Institute of Chemical Biology and Key Laboratory of Natural Medicine and Immuno-Engineering of Henan Province, Henan University, Kaifeng, Henan, People’s Republic of China 475004, and Department of Chemistry, National University of Singapore, 3 Science Drive 3, Singapore 117543
| | - Hongjun Liu
- Institute of Chemical Biology and Key Laboratory of Natural Medicine and Immuno-Engineering of Henan Province, Henan University, Kaifeng, Henan, People’s Republic of China 475004, and Department of Chemistry, National University of Singapore, 3 Science Drive 3, Singapore 117543
| | - Yuanhuang Pan
- Institute of Chemical Biology and Key Laboratory of Natural Medicine and Immuno-Engineering of Henan Province, Henan University, Kaifeng, Henan, People’s Republic of China 475004, and Department of Chemistry, National University of Singapore, 3 Science Drive 3, Singapore 117543
| | - Lin Yan
- Institute of Chemical Biology and Key Laboratory of Natural Medicine and Immuno-Engineering of Henan Province, Henan University, Kaifeng, Henan, People’s Republic of China 475004, and Department of Chemistry, National University of Singapore, 3 Science Drive 3, Singapore 117543
| | - Zhiyong Jiang
- Institute of Chemical Biology and Key Laboratory of Natural Medicine and Immuno-Engineering of Henan Province, Henan University, Kaifeng, Henan, People’s Republic of China 475004, and Department of Chemistry, National University of Singapore, 3 Science Drive 3, Singapore 117543
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24
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Enantioselective sulfa-Michael addition of thioacids to α,β-unsaturated ketones with bifunctional organocatalyst. Tetrahedron Lett 2012. [DOI: 10.1016/j.tetlet.2012.02.052] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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25
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Yang W, Du DM. Squaramide-catalysed enantio- and diastereoselective sulfa-Michael addition of thioacetic acid to α,β-disubstituted nitroalkenes. Org Biomol Chem 2012; 10:6876-84. [DOI: 10.1039/c2ob26068a] [Citation(s) in RCA: 58] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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