1
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Zhang LW, Wang L, Ji N, Dai SY, He W. Asymmetric epoxidation of α,β-unsaturated ketones via an amine-thiourea dual activation catalysis. Tetrahedron Lett 2021. [DOI: 10.1016/j.tetlet.2021.152941] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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2
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Abstract
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Many catalysts were tested in asymmetric Michael additions in order to synthesize
enantioenriched products. One of the most common reaction types among the Michael
reactions is the conjugated addition of malonates to enones making it possible to investigate
the structure–activity relationship of the catalysts. The most commonly used Michael
acceptors are chalcone, substituted chalcones, chalcone derivatives, cyclic enones,
while typical donors may be dimethyl, diethyl, dipropyl, diisopropyl, dibutyl, di-tert-butyl
and dibenzyl malonates. This review summarizes the most important enantioselective
catalysts applied in these types of reactions.
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Affiliation(s)
- Péter Bakó
- Department of Organic Chemistry and Technology, Budapest University of Technology and Economics, PO Box 91, 1521 Budapest, Hungary
| | - Tamás Nemcsok
- Department of Organic Chemistry and Technology, Budapest University of Technology and Economics, PO Box 91, 1521 Budapest, Hungary
| | - Zsolt Rapi
- Department of Organic Chemistry and Technology, Budapest University of Technology and Economics, PO Box 91, 1521 Budapest, Hungary
| | - György Keglevich
- Department of Organic Chemistry and Technology, Budapest University of Technology and Economics, PO Box 91, 1521 Budapest, Hungary
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3
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Tian Q, Liu Y, Wang X, Wang X, He W. Pd II
/Novel Chiral Cinchona Alkaloid Oxazoline-Catalyzed Enantioselective Oxidative Cyclization of Aromatic Alkenyl Amides. European J Org Chem 2019. [DOI: 10.1002/ejoc.201900431] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Affiliation(s)
- Qinqin Tian
- Department of Chemistry; School of Pharmacy; The Fourth Military Medical University; 710032 Xi'an People's Republic of China
| | - Yulong Liu
- Department of Chemistry; School of Pharmacy; The Fourth Military Medical University; 710032 Xi'an People's Republic of China
| | - Xiaoyun Wang
- Department of Chemistry; School of Pharmacy; The Fourth Military Medical University; 710032 Xi'an People's Republic of China
| | - Xie Wang
- Department of Chemistry; School of Pharmacy; The Fourth Military Medical University; 710032 Xi'an People's Republic of China
| | - Wei He
- Department of Chemistry; School of Pharmacy; The Fourth Military Medical University; 710032 Xi'an People's Republic of China
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4
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Boratyński PJ, Zielińska-Błajet M, Skarżewski J. Cinchona Alkaloids-Derivatives and Applications. THE ALKALOIDS. CHEMISTRY AND BIOLOGY 2019; 82:29-145. [PMID: 30850032 DOI: 10.1016/bs.alkal.2018.11.001] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Major Cinchona alkaloids quinine, quinidine, cinchonine, and cinchonidine are available chiral natural compounds (chiral pool). Unlike many other natural products, these alkaloids are available in multiple diastereomeric forms which are separated on an industrial scale. The introduction discusses in short conformational equilibria, traditional separation scheme, biosynthesis, and de novo chemical syntheses. The second section concerns useful chemical applications of the alkaloids as chiral recognition agents and effective chiral catalysts. Besides the Sharpless ethers and quaternary ammonium salts (chiral PTC), the most successful bifunctional organocatalysts are based on 9-amino derivatives: thioureas and squaramides. The third section reports the main transformations of Cinchona alkaloids. This covers reactions of the 9-hydroxyl group with the retention or inversion of configuration. Specific Cinchona rearrangements enlarging [2.2.2]bicycle of quinuclidine to [3.2.2] products are connected to the 9-OH substitution. The syntheses of numerous esterification and etherification products are described, including many examples of bi-Cinchona alkaloid ethers. Further derivatives comprise 9-N-substituted compounds. The amino group is introduced via an azido function with the inversion of configuration at the stereogenic center C9. The 9-epi-amino-alkaloids provide imines, amides, imides, thioureas, and squaramides. The syntheses of 9-carbon-, 9-sulfur-, and 9-selenium-substituted derivatives are discussed. Oxidation of the hydroxyl group of any alkaloid gives ketones, which can be selectively reduced, reacted with Grignard reagents, or subjected to the Corey-Chaykovsky reaction. The alkaloids were also partially degraded by splitting C4'-C9 or N1-C8 bonds. In order to immobilize Cinchona alkaloids the transformations of the 3-vinyl group were often exploited. Finally, miscellaneous functionalizations of quinuclidine, quinoline, and examples of various metal complexes of the alkaloids are considered.
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Affiliation(s)
| | | | - Jacek Skarżewski
- Department of Organic Chemistry, Wrocław University of Technology, Wrocław, Poland.
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5
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Odanaka Y, Kanemitsu T, Iwasaki K, Mochizuki Y, Miyazaki M, Nagata K, Kato M, Itoh T. Asymmetric Michael addition of malonic diesters to acrylates by phase-transfer catalysis toward the construction of quaternary stereogenic α-carbons. Tetrahedron 2019. [DOI: 10.1016/j.tet.2018.11.037] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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6
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Wang W, Ye L, Shi Z, Zhao Z, Li X. Enantioselective Michael addition of malonates to α,β-unsaturated ketones catalyzed by 1,2-diphenylethanediamine. RSC Adv 2018; 8:41699-41704. [PMID: 35558786 PMCID: PMC9091971 DOI: 10.1039/c8ra07809b] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2018] [Accepted: 12/03/2018] [Indexed: 11/21/2022] Open
Abstract
A general and highly enantioselective Michael addition of malonates to cinnamones and chalcones has been developed. The commercially available 1,2-diphenylethanediamine could be directly utilized as the organocatalyst to furnish the desired adducts in satisfactory yield (61–99%) and moderate to excellent enantiopurity (65 to >99% ee). β-Ketoester was also a competent donor and was employed to construct densely functionalized cyclohexenones via a tandem Michael-aldol condensation process. 1,2-Diphenylethanediamine could be directly utilized to promote the Michael addition of malonates and β-ketoesters to various α,β-unsaturated ketones.![]()
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Affiliation(s)
- Wei Wang
- College of Chemistry and Environment Protection Engineering, Southwest Minzu University Chengdu 610041 China
| | - Ling Ye
- Faculty of Geosciences and Environmental Engineering, Southwest Jiaotong University Chengdu 610031 China
| | - Zhichuan Shi
- College of Chemistry and Environment Protection Engineering, Southwest Minzu University Chengdu 610041 China
| | - Zhigang Zhao
- College of Chemistry and Environment Protection Engineering, Southwest Minzu University Chengdu 610041 China
| | - Xuefeng Li
- College of Chemistry and Environment Protection Engineering, Southwest Minzu University Chengdu 610041 China
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7
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Liu Y, Wei Z, Liu Y, Wang J, Cao J, Liang D, Duan H, Lin Y. Chiral Phase-transfer Catalysts Bearing Multiple Hydrogen-bonding Donors Derived from Amino Acids: Efficient Catalysts for Diastereo- and Enantioselective Nitro-Mannich Reaction. Chem Res Chin Univ 2018. [DOI: 10.1007/s40242-018-8005-5] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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8
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Separation and determination of cinchona alkaloids by ligand-exchange capillary electrophoresis using a Cu(II)–l-lysine complex as selector. JOURNAL OF THE IRANIAN CHEMICAL SOCIETY 2018. [DOI: 10.1007/s13738-018-1345-8] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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9
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Liu Y, Wang J, Wei Z, Cao J, Liang D, Lin Y, Duan H. Diastereo- and enantioselective nitro-Mannich reaction of isatin-derived N-Boc ketimines catalyzed by chiral phase-transfer catalysts. NEW J CHEM 2018. [DOI: 10.1039/c7nj04527a] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
A series of 3-substituted 3-amino-oxindoles were constructed in excellent yields (96–99%) with high enantioselectivities (up to 95% ee) and diastereoselectivities (up to 95 : 5 dr) catalyzed by Cinchona alkaloid-derived phase-transfer catalysts.
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Affiliation(s)
- Yuxin Liu
- Department of Organic Chemistry, College of Chemistry, Jilin University
- Changchun 130012
- China
| | - Jingdong Wang
- Department of Organic Chemistry, College of Chemistry, Jilin University
- Changchun 130012
- China
| | - Zhonglin Wei
- Department of Organic Chemistry, College of Chemistry, Jilin University
- Changchun 130012
- China
| | - Jungang Cao
- Department of Organic Chemistry, College of Chemistry, Jilin University
- Changchun 130012
- China
| | - Dapeng Liang
- Department of Organic Chemistry, College of Chemistry, Jilin University
- Changchun 130012
- China
| | - Yingjie Lin
- Department of Organic Chemistry, College of Chemistry, Jilin University
- Changchun 130012
- China
| | - Haifeng Duan
- Department of Organic Chemistry, College of Chemistry, Jilin University
- Changchun 130012
- China
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10
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Zuo W, Hu X, Yang Y, Jiang L, Ren L, Huang H. Development of an Improved Method to Determine Saturated Aliphatic Aldehydes in Docosahexaenoic Acid-Rich Oil: A Supplement to p
-Anisidine Value. EUR J LIPID SCI TECH 2017. [DOI: 10.1002/ejlt.201700243] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Affiliation(s)
- Wenlu Zuo
- Jiangsu National Synergetic Innovation Center for Advanced Materials, College of Biotechnology and Pharmaceutical Engineering, School of Pharmaceutical Sciences; Nanjing Tech University; No. 30 South Puzhu Road Nanjing 211816 People's Republic of China
| | - Xuechao Hu
- Jiangsu National Synergetic Innovation Center for Advanced Materials, College of Biotechnology and Pharmaceutical Engineering, School of Pharmaceutical Sciences; Nanjing Tech University; No. 30 South Puzhu Road Nanjing 211816 People's Republic of China
| | - Yaqiong Yang
- Jiangsu National Synergetic Innovation Center for Advanced Materials, College of Biotechnology and Pharmaceutical Engineering, School of Pharmaceutical Sciences; Nanjing Tech University; No. 30 South Puzhu Road Nanjing 211816 People's Republic of China
| | - Ling Jiang
- Jiangsu National Synergetic Innovation Center for Advanced Materials, College of Biotechnology and Pharmaceutical Engineering, School of Pharmaceutical Sciences; Nanjing Tech University; No. 30 South Puzhu Road Nanjing 211816 People's Republic of China
| | - Lujing Ren
- Jiangsu National Synergetic Innovation Center for Advanced Materials, College of Biotechnology and Pharmaceutical Engineering, School of Pharmaceutical Sciences; Nanjing Tech University; No. 30 South Puzhu Road Nanjing 211816 People's Republic of China
| | - He Huang
- Jiangsu National Synergetic Innovation Center for Advanced Materials, College of Biotechnology and Pharmaceutical Engineering, School of Pharmaceutical Sciences; Nanjing Tech University; No. 30 South Puzhu Road Nanjing 211816 People's Republic of China
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11
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Liu Y, Liu Y, Wang J, Wei Z, Cao J, Liang D, Lin Y, Duan H. Asymmetric phase-transfer catalysts bearing multiple hydrogen-bonding donors: Synthesis and application in nitro-Mannich reaction of isatin-derived N-Boc ketimines. Tetrahedron Lett 2017. [DOI: 10.1016/j.tetlet.2017.05.022] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
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12
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Lu N, Li R, Wei Z, Cao J, Liang D, Lin Y, Duan H. Enantio- and Diastereoselective Nitro-Mannich Reaction of α-Aryl Nitromethanes with Amidosulfones Catalyzed by Phase-Transfer Catalysts. J Org Chem 2017; 82:4668-4676. [DOI: 10.1021/acs.joc.7b00306] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Ning Lu
- Department of Organic Chemistry,
College of Chemistry, Jilin University, 2699 Qianjin Street, Changchun 130012, China
| | - Ruxu Li
- Department of Organic Chemistry,
College of Chemistry, Jilin University, 2699 Qianjin Street, Changchun 130012, China
| | - Zhonglin Wei
- Department of Organic Chemistry,
College of Chemistry, Jilin University, 2699 Qianjin Street, Changchun 130012, China
| | - Jungang Cao
- Department of Organic Chemistry,
College of Chemistry, Jilin University, 2699 Qianjin Street, Changchun 130012, China
| | - Dapeng Liang
- Department of Organic Chemistry,
College of Chemistry, Jilin University, 2699 Qianjin Street, Changchun 130012, China
| | - Yingjie Lin
- Department of Organic Chemistry,
College of Chemistry, Jilin University, 2699 Qianjin Street, Changchun 130012, China
| | - Haifeng Duan
- Department of Organic Chemistry,
College of Chemistry, Jilin University, 2699 Qianjin Street, Changchun 130012, China
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13
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Liu Y, Wei Z, Liu Y, Cao J, Liang D, Lin Y, Duan H. Novel α-amino acid-derived phase-transfer catalyst application to a highly enantio- and diastereoselective nitro-Mannich reaction. Org Biomol Chem 2017; 15:9234-9242. [DOI: 10.1039/c7ob02501g] [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
Very broad substrate generality was observed, and the products were achieved in high enantio-/diastereoselectivities (90–>99.9% ee, 9 : 1 to 11 : 1 dr).
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Affiliation(s)
- Yuxin Liu
- Department of Chemistry
- Jilin University
- Changchun
- China
| | - Zhonglin Wei
- Department of Chemistry
- Jilin University
- Changchun
- China
| | - Yu Liu
- Department of Chemistry
- Jilin University
- Changchun
- China
| | - Jungang Cao
- Department of Chemistry
- Jilin University
- Changchun
- China
| | - Dapeng Liang
- Department of Chemistry
- Jilin University
- Changchun
- China
| | - Yingjie Lin
- Department of Chemistry
- Jilin University
- Changchun
- China
| | - Haifeng Duan
- Department of Chemistry
- Jilin University
- Changchun
- China
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14
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Koppolu SR, Balamurugan R. In situ formed acetals facilitated direct Michael addition of unactivated ketones. NEW J CHEM 2017. [DOI: 10.1039/c6nj02954j] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
A facile Michael addition of unactivated ketones under Brønsted acid conditions for the synthesis of 1,5-diketones.
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15
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Cao D, Fang G, Zhang J, Wang H, Zheng C, Zhao G. Enantioselective Michael Addition of Malonates to Chalcone Derivatives Catalyzed by Dipeptide-derived Multifunctional Phosphonium Salts. J Org Chem 2016; 81:9973-9982. [DOI: 10.1021/acs.joc.6b01752] [Citation(s) in RCA: 52] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Dongdong Cao
- Key Laboratory of Synthetic
Chemistry of Natural Substances, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, 345 Lingling Road, Shanghai 200032, China
| | - Guosheng Fang
- Key Laboratory of Synthetic
Chemistry of Natural Substances, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, 345 Lingling Road, Shanghai 200032, China
| | - Jiaxing Zhang
- Key Laboratory of Synthetic
Chemistry of Natural Substances, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, 345 Lingling Road, Shanghai 200032, China
| | - Hongyu Wang
- Key Laboratory of Synthetic
Chemistry of Natural Substances, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, 345 Lingling Road, Shanghai 200032, China
| | - Changwu Zheng
- Key Laboratory of Synthetic
Chemistry of Natural Substances, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, 345 Lingling Road, Shanghai 200032, China
| | - Gang Zhao
- Key Laboratory of Synthetic
Chemistry of Natural Substances, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, 345 Lingling Road, Shanghai 200032, China
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16
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Rapi Z, Grün A, Nemcsok T, Hessz D, Kállay M, Kubinyi M, Keglevich G, Bakó P. Crown ether derived from d-glucose as an efficient phase-transfer catalyst for the enantioselective Michael addition of malonates to enones. ACTA ACUST UNITED AC 2016. [DOI: 10.1016/j.tetasy.2016.08.010] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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17
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Zhang ML, Chen L, You Y, Wang ZH, Yue DF, Zhang XM, Xu XY, Yuan WC. Asymmetric Michael reaction of arylacetyl phosphonates to nitroalkenes with bifunctional amine-thiourea catalyst bearing multiple-hydrogen-bond donor: efficient construction of chiral α-substituted carboxylic ester compounds. Tetrahedron 2016. [DOI: 10.1016/j.tet.2015.08.046] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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18
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Ji N, Yuan J, Xue S, Zhang J, He W. Novel chiral thiourea organocatalysts for the catalytic asymmetric oxaziridination. Tetrahedron 2016. [DOI: 10.1016/j.tet.2015.12.010] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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19
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Vural U, Durmaz M, Sirit A. A novel calix[4]arene-based bifunctional squaramide organocatalyst for enantioselective Michael addition of acetylacetone to nitroolefins. Org Chem Front 2016. [DOI: 10.1039/c6qo00135a] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
A new chiral calix[4]arene-based organocatalyst 3 bearing bis-squaramide moieties was designed and synthesized from p-tert-butylcalix[4]arene. This bifunctional organocatalyst was used in the enantioselective conjugate addition of acetyl acetone to β-nitrostyrenes. The corresponding adducts were obtained in good to excellent yields with high enantioselectivities.
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Affiliation(s)
- Ummu Vural
- Department of Chemistry
- Ahmet Kelesoglu Education Faculty
- Necmettin Erbakan University
- 42090 Konya
- Turkey
| | - Mustafa Durmaz
- Department of Chemistry
- Ahmet Kelesoglu Education Faculty
- Necmettin Erbakan University
- 42090 Konya
- Turkey
| | - Abdulkadir Sirit
- Department of Chemistry
- Ahmet Kelesoglu Education Faculty
- Necmettin Erbakan University
- 42090 Konya
- Turkey
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20
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Ren X, He C, Feng Y, Chai Y, Yao W, Chen W, Zhang S. Novel ferrocene-based bifunctional amine-thioureas for asymmetric Michael addition of acetylacetone to nitroolefins. Org Biomol Chem 2015; 13:5054-60. [PMID: 25832649 DOI: 10.1039/c5ob00298b] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
An efficient method was developed to synthesize ferrocene-based bifunctional amine-thioureas bearing multiple hydrogen-bonding donors. Asymmetric Michael addition of acetylacetone to nitroolefins catalyzed by these novel bifunctional catalysts affords the Michael adducts in high yield and moderate to excellent enantioselectivities. Multiple hydrogen-bonds play an important role in accelerating the reaction.
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Affiliation(s)
- Xiaochen Ren
- Key Laboratory of Applied Surface and Colloid Chemistry, School of Chemistry and Chemical Engineering Shaanxi Normal University, Xi'an, Shaanxi 710062, P.R. China.
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21
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Zhao W, Li Y, Zhang Y, Zhang H, Yu H, Chen A. Determination of Cinchona Alkaloids by Capillary Electrophoresis with Novel Complex Formation. ANAL LETT 2015. [DOI: 10.1080/00032719.2015.1089258] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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22
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Recent advances of organocatalytic enantioselective Michael-addition to chalcone. RESEARCH ON CHEMICAL INTERMEDIATES 2015. [DOI: 10.1007/s11164-015-2193-0] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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23
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Ashokkumar V, Siva A. Cinchona alkaloid-based chiral catalysts act as highly efficient multifunctional organocatalysts for the asymmetric conjugate addition of malonates to nitroolefins. Org Biomol Chem 2015; 13:10216-25. [PMID: 26308733 DOI: 10.1039/c5ob01351h] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
New pentaerythritol tetrabromide-based chiral quaternary ammonium salts acting as organocatalysts (7a and 7b) have been prepared and used as organocatalysts for enantioselective Michael addition reactions between various nitroolefins and Michael donors (malonates) under mild reaction conditions, such as lower concentration of base and catalyst and room temperature, with very good chemical yields (up to 97%) and ee's (up to 99%).
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Affiliation(s)
- Veeramanoharan Ashokkumar
- Department of Inorganic Chemistry, School of Chemistry, Madurai Kamaraj University, Madurai 625 021, Tamil Nadu, India.
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24
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Zhou MJ, Li Y, Dang L. Theoretical Studies on the Mechanism of the Michael Addition Reaction Catalyzed by a Thiourea-Cinchona-Amine: Triple Activation. ASIAN J ORG CHEM 2015. [DOI: 10.1002/ajoc.201500183] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Mei-Juan Zhou
- Department of Chemistry; South University of Science and Technology of China; Shenzhen 518055 P. R. China
| | - Yun Li
- Department of Chemistry; South University of Science and Technology of China; Shenzhen 518055 P. R. China
| | - Li Dang
- Department of Chemistry; South University of Science and Technology of China; Shenzhen 518055 P. R. China
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25
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Cao D, Zhang J, Wang H, Zhao G. Dipeptide-Derived Multifunctional Quaternary Phosphonium Salt Catalyzed Asymmetric Cyclizations via a Tandem Michael Addition/SN2 Sequence. Chemistry 2015; 21:9998-10002. [DOI: 10.1002/chem.201501806] [Citation(s) in RCA: 57] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2015] [Indexed: 12/17/2022]
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26
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Kumagai Y, Naoe T, Nishikawa K, Osaka K, Morita T, Yoshimi Y. Formation of Carbanions from Carboxylate Ions Bearing Electron-Withdrawing Groups via Photoinduced Decarboxylation: Addition of Generated Carbanions to Benzaldehyde. Aust J Chem 2015. [DOI: 10.1071/ch15115] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
The photoinduced decarboxylation of carboxylate ions bearing electron-withdrawing groups using biphenyl and 1,4-dicyanonaphthalene leads to the efficient generation of carbanions under mild conditions. The efficiency of the carbanion generation is strongly dependent on the single-electron transfer from the photogenerated radical anion of the electron-acceptor to the radical. In particular, the cyanomethyl anion formed using this photochemical method can be added to benzaldehydes to give the corresponding adducts.
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