1
|
Baczewska P, Kulczykowski M, Zambroń B, Jaszczewska-Adamczak J, Pakulski Z, Roszak R, Grzybowski BA, Mlynarski J. Machine Learning Algorithm Guides Catalyst Choices for Magnesium-Catalyzed Asymmetric Reactions. Angew Chem Int Ed Engl 2024:e202318487. [PMID: 38878001 DOI: 10.1002/anie.202318487] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2023] [Indexed: 08/13/2024]
Abstract
Organic-chemical literature encompasses large numbers of catalysts and reactions they can effect. Many of these examples are published merely to document the catalysts' scope but do not necessarily guarantee that a given catalyst is "optimal"-in terms of yield or enantiomeric excess-for a particular reaction. This paper describes a Machine Learning model that aims to improve such catalyst-reaction assignments based on the carefully curated literature data. As we show here for the case of asymmetric magnesium catalysis, this model achieves relatively high accuracy and offers out of-the-box predictions successfully validated by experiment, e.g., in synthetically demanding asymmetric reductions or Michael additions.
Collapse
Affiliation(s)
- Paulina Baczewska
- Institute of Organic Chemistry, Polish Academy of Sciences, Kasprzaka 44/52, 02-224, Warsaw, Poland
| | - Michał Kulczykowski
- Institute of Organic Chemistry, Polish Academy of Sciences, Kasprzaka 44/52, 02-224, Warsaw, Poland
| | - Bartosz Zambroń
- Institute of Organic Chemistry, Polish Academy of Sciences, Kasprzaka 44/52, 02-224, Warsaw, Poland
| | | | - Zbigniew Pakulski
- Institute of Organic Chemistry, Polish Academy of Sciences, Kasprzaka 44/52, 02-224, Warsaw, Poland
| | - Rafał Roszak
- Institute of Organic Chemistry, Polish Academy of Sciences, Kasprzaka 44/52, 02-224, Warsaw, Poland
| | - Bartosz A Grzybowski
- Institute of Organic Chemistry, Polish Academy of Sciences, Kasprzaka 44/52, 02-224, Warsaw, Poland
- Center for Algorithmic and Robotized Synthesis (CARS) of Korea's Institute for Basic Science (IBS) and Department of Chemistry, Ulsan National Institute of Science and Technology 50, UNIST-gil, Eonyang-eup, Ulju-gun, Ulsan, 44919, South Korea
| | - Jacek Mlynarski
- Institute of Organic Chemistry, Polish Academy of Sciences, Kasprzaka 44/52, 02-224, Warsaw, Poland
| |
Collapse
|
2
|
Golla S, Kokatla HP. Rongalite-Mediated Transition Metal- and Hydride-Free Chemoselective Reduction of α-Keto Esters and α-Keto Amides. J Org Chem 2022; 87:9915-9925. [PMID: 35839148 DOI: 10.1021/acs.joc.2c00936] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A transition metal- and hydride-free protocol has been developed for the chemoselective reduction of α-keto esters and α-keto amides using rongalite as a reducing agent. Here, rongalite acts as a hydride-free reducing agent via a radical mechanism. This protocol offers the synthesis of a wide range of α-hydroxy esters and α-hydroxy amides with 85-98% yields. This chemoselective method is compatible with other reducible functionalities such as halides, alkenes, amides, and nitriles. The use of inexpensive rongalite (ca. $0.03/1 g), mild reaction conditions, and gram-scale synthesis are some of the key features of this methodology. Also, cyclandelate, a vasodilator drug, has been synthesized in gram scale with 79% yield.
Collapse
Affiliation(s)
- Sivaparwathi Golla
- Department of Chemistry, National Institute of Technology Warangal, Warangal, Telangana 506004, India
| | - Hari Prasad Kokatla
- Department of Chemistry, National Institute of Technology Warangal, Warangal, Telangana 506004, India
| |
Collapse
|
3
|
Na F, Lopez SS, Beauseigneur A, Hernandez LW, Sun Z, Antilla JC. Catalytic Asymmetric Transfer Hydrogenation of trans-Chalcone Derivatives Using BINOL-derived Boro-phosphates. Org Lett 2020; 22:5953-5957. [PMID: 32692927 DOI: 10.1021/acs.orglett.0c02042] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Chiral phosphoric-acid-catalyzed asymmetric reductions of trans-chalcones have been investigated in this work. A BINOL-derived boro-phosphate-catalyzed asymmetric transfer hydrogenation of the carbon-carbon double bond of trans-chalcone derivatives employing borane as a hydride source was realized. This methodology provides a convenient procedure to access chiral dihydrochalone derivatives in high yields and with high enantioselectivities under mild conditions.
Collapse
Affiliation(s)
- Fei Na
- Institute for Molecular Design and Synthesis, School of Pharmaceutical Science and Technology, Tianjin University, Tianjin 300072, China
| | - Susana S Lopez
- Department of Chemistry, University of South Florida, Tampa, Florida 33620, United States
| | - Alice Beauseigneur
- Department of Chemistry, University of South Florida, Tampa, Florida 33620, United States
| | - Lucas W Hernandez
- Department of Chemistry, University of South Florida, Tampa, Florida 33620, United States
| | - Zhuoxin Sun
- Institute for Molecular Design and Synthesis, School of Pharmaceutical Science and Technology, Tianjin University, Tianjin 300072, China
| | - Jon C Antilla
- Institute for Molecular Design and Synthesis, School of Pharmaceutical Science and Technology, Tianjin University, Tianjin 300072, China
| |
Collapse
|
4
|
Luo X, He R, Liu Q, Gao Y, Li J, Chen X, Zhu Z, Huang Y, Li Y. Metal-Free Oxidative Esterification of Ketones and Potassium Xanthates: Selective Synthesis of α-Ketoesters and Esters. J Org Chem 2020; 85:5220-5230. [DOI: 10.1021/acs.joc.9b03272] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Affiliation(s)
- Xianglin Luo
- School of Biotechnology and Health Sciences, Wuyi University, Jiangmen, Guangdong Province 529090, China
| | - Runfa He
- School of Biotechnology and Health Sciences, Wuyi University, Jiangmen, Guangdong Province 529090, China
| | - Qiang Liu
- School of Biotechnology and Health Sciences, Wuyi University, Jiangmen, Guangdong Province 529090, China
- Center of Basic Molecular Science, Department of Chemistry, Tsinghua University, Beijing 100084, China
| | - Yanping Gao
- School of Biotechnology and Health Sciences, Wuyi University, Jiangmen, Guangdong Province 529090, China
| | - Jingqing Li
- School of Biotechnology and Health Sciences, Wuyi University, Jiangmen, Guangdong Province 529090, China
| | - Xiuwen Chen
- School of Biotechnology and Health Sciences, Wuyi University, Jiangmen, Guangdong Province 529090, China
| | - Zhongzhi Zhu
- School of Biotechnology and Health Sciences, Wuyi University, Jiangmen, Guangdong Province 529090, China
| | - Yubing Huang
- School of Biotechnology and Health Sciences, Wuyi University, Jiangmen, Guangdong Province 529090, China
| | - Yibiao Li
- School of Biotechnology and Health Sciences, Wuyi University, Jiangmen, Guangdong Province 529090, China
| |
Collapse
|
5
|
Adachi T, Harada A, Yamaguchi H. Development of Atroposelective Antibodies by Immunization with a Racemic Mixture of Binaphthyl Derivatives. BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 2019. [DOI: 10.1246/bcsj.20190135] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Takuma Adachi
- Department of Macromolecular Science, Graduate School of Science, Osaka University, Toyonaka, Osaka 560-0043, Japan
| | - Akira Harada
- The Institute of Scientific and Industrial Research, Osaka University, Ibaraki 567-0047, Japan
| | - Hiroyasu Yamaguchi
- Department of Macromolecular Science, Graduate School of Science, Osaka University, Toyonaka, Osaka 560-0043, Japan
| |
Collapse
|
6
|
Gao Y, Zhang X, Laishram RD, Chen J, Li K, Zhang K, Zeng G, Fan B. Cobalt‐Catalyzed Transfer Hydrogenation of α‐Ketoesters and
N
‐Cyclicsulfonylimides Using H
2
O as Hydrogen Source. Adv Synth Catal 2019. [DOI: 10.1002/adsc.201900636] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Affiliation(s)
- Yang Gao
- YMU-HKBU Joint Laboratory of Traditional Natural Medicine/Key Laboratory of Chemistry in Ethnic Medicinal Resources Yunnan Minzu University Kunming 650500 People's Republic of China
| | - Xuexin Zhang
- YMU-HKBU Joint Laboratory of Traditional Natural Medicine/Key Laboratory of Chemistry in Ethnic Medicinal Resources Yunnan Minzu University Kunming 650500 People's Republic of China
| | - Ronibala Devi Laishram
- YMU-HKBU Joint Laboratory of Traditional Natural Medicine/Key Laboratory of Chemistry in Ethnic Medicinal Resources Yunnan Minzu University Kunming 650500 People's Republic of China
| | - Jingchao Chen
- YMU-HKBU Joint Laboratory of Traditional Natural Medicine/Key Laboratory of Chemistry in Ethnic Medicinal Resources Yunnan Minzu University Kunming 650500 People's Republic of China
| | - Kangkui Li
- YMU-HKBU Joint Laboratory of Traditional Natural Medicine/Key Laboratory of Chemistry in Ethnic Medicinal Resources Yunnan Minzu University Kunming 650500 People's Republic of China
| | - Keyang Zhang
- YMU-HKBU Joint Laboratory of Traditional Natural Medicine/Key Laboratory of Chemistry in Ethnic Medicinal Resources Yunnan Minzu University Kunming 650500 People's Republic of China
| | - Guangzhi Zeng
- YMU-HKBU Joint Laboratory of Traditional Natural Medicine/Key Laboratory of Chemistry in Ethnic Medicinal Resources Yunnan Minzu University Kunming 650500 People's Republic of China
| | - Baomin Fan
- YMU-HKBU Joint Laboratory of Traditional Natural Medicine/Key Laboratory of Chemistry in Ethnic Medicinal Resources Yunnan Minzu University Kunming 650500 People's Republic of China
- Key Laboratory of Chemistry in Ethnic Medicinal Resources Yunnan Minzu University Kunming 650500 People's Republic of China
| |
Collapse
|
7
|
Zhang Y, He L, Shi L. Chiral Ion-Pair Organocatalyst-Promoted Efficient Enantio-selective Reduction of α-Hydroxy Ketones. Adv Synth Catal 2018. [DOI: 10.1002/adsc.201800053] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Yiliang Zhang
- Shenzhen Graduate School; Harbin Institute of Technology; Shenzhen 518055 People's Republic of China
- MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage, School of Chemistry and Chemical Engineering; Harbin Institute of Technology; Harbin 150001 People's Republic of China
| | - Li He
- Shenzhen Graduate School; Harbin Institute of Technology; Shenzhen 518055 People's Republic of China
- MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage, School of Chemistry and Chemical Engineering; Harbin Institute of Technology; Harbin 150001 People's Republic of China
| | - Lei Shi
- Shenzhen Graduate School; Harbin Institute of Technology; Shenzhen 518055 People's Republic of China
- MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage, School of Chemistry and Chemical Engineering; Harbin Institute of Technology; Harbin 150001 People's Republic of China
| |
Collapse
|
8
|
Hu Y, Yin X, Chen Z, Dong XQ, Zhang X. Highly enantioselective Ir/f-amphox-catalyzed hydrogenation of ketoamides: efficient access to chiral hydroxy amides. Org Chem Front 2018. [DOI: 10.1039/c8qo00307f] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
Asymmetric synthesis of chiral hydroxy amides has been successfully accomplished by asymmetric hydrogenation of prochiral α-, β-, γ-, δ-keto amides catalyzed by Ir/f-amphox with up to >99% conversion and >99% ee.
Collapse
Affiliation(s)
- Yang Hu
- College of Chemistry and Molecular Sciences
- Wuhan University
- Wuhan
- 430072
- P. R. China
| | - Xuguang Yin
- College of Chemistry and Molecular Sciences
- Wuhan University
- Wuhan
- 430072
- P. R. China
| | - Ziyi Chen
- College of Chemistry and Molecular Sciences
- Wuhan University
- Wuhan
- 430072
- P. R. China
| | - Xiu-Qin Dong
- College of Chemistry and Molecular Sciences
- Wuhan University
- Wuhan
- 430072
- P. R. China
| | - Xumu Zhang
- College of Chemistry and Molecular Sciences
- Wuhan University
- Wuhan
- 430072
- P. R. China
| |
Collapse
|
9
|
Gu G, Yang T, Lu J, Wen J, Dang L, Zhang X. Iridium/f-ampha-catalyzed asymmetric hydrogenation of aromatic α-keto esters. Org Chem Front 2018. [DOI: 10.1039/c8qo00047f] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We herein report an iridium/f-ampha catalytic system for the asymmetric hydrogenation of aromatic α-keto esters.
Collapse
Affiliation(s)
- Guoxian Gu
- Department of Chemistry
- Southern University of Science and Technology
- Shenzhen
- P. R. China
| | - Tilong Yang
- Department of Chemistry
- Southern University of Science and Technology
- Shenzhen
- P. R. China
| | - Jiaxiang Lu
- Department of Chemistry
- Southern University of Science and Technology
- Shenzhen
- P. R. China
| | - Jialin Wen
- Department of Chemistry
- Southern University of Science and Technology
- Shenzhen
- P. R. China
| | - Li Dang
- Department of Chemistry and Key Laboratory for Preparation and Application of Ordered Structural Materials of Guangdong Province
- Shantou University
- Shantou
- P. R. China
| | - Xumu Zhang
- Department of Chemistry
- Southern University of Science and Technology
- Shenzhen
- P. R. China
| |
Collapse
|
10
|
Gu G, Yang T, Yu O, Qian H, Wang J, Wen J, Dang L, Zhang X. Enantioselective Iridium-Catalyzed Hydrogenation of α-Keto Amides to α-Hydroxy Amides. Org Lett 2017; 19:5920-5923. [DOI: 10.1021/acs.orglett.7b02912] [Citation(s) in RCA: 44] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Guoxian Gu
- Department
of Chemistry, Southern University of Science and Technology, 1088
Xueyuan Road, Nanshan District, Shenzhen, Guangdong 518055, P. R. China
| | - Tilong Yang
- Department
of Chemistry, Southern University of Science and Technology, 1088
Xueyuan Road, Nanshan District, Shenzhen, Guangdong 518055, P. R. China
| | - Ouran Yu
- Department
of Chemistry, Southern University of Science and Technology, 1088
Xueyuan Road, Nanshan District, Shenzhen, Guangdong 518055, P. R. China
| | - Hua Qian
- Department
of Chemistry, Southern University of Science and Technology, 1088
Xueyuan Road, Nanshan District, Shenzhen, Guangdong 518055, P. R. China
| | - Jiang Wang
- Department
of Chemistry, Southern University of Science and Technology, 1088
Xueyuan Road, Nanshan District, Shenzhen, Guangdong 518055, P. R. China
| | - Jialin Wen
- Department
of Chemistry, Southern University of Science and Technology, 1088
Xueyuan Road, Nanshan District, Shenzhen, Guangdong 518055, P. R. China
| | - Li Dang
- Department
of Chemistry, Southern University of Science and Technology, 1088
Xueyuan Road, Nanshan District, Shenzhen, Guangdong 518055, P. R. China
- Department
of Chemistry and Key Laboratory for Preparation and Application of
Ordered Structural Materials of Guangdong Province, Shantou University, Shantou, Guangdong 515063, P. R. China
| | - Xumu Zhang
- Department
of Chemistry, Southern University of Science and Technology, 1088
Xueyuan Road, Nanshan District, Shenzhen, Guangdong 518055, P. R. China
| |
Collapse
|
11
|
Parmar D, Sugiono E, Raja S, Rueping M. Addition and Correction to Complete Field Guide to Asymmetric BINOL-Phosphate Derived Brønsted Acid and Metal Catalysis: History and Classification by Mode of Activation; Brønsted Acidity, Hydrogen Bonding, Ion Pairing, and Metal Phosphates. Chem Rev 2017; 117:10608-10620. [DOI: 10.1021/acs.chemrev.7b00197] [Citation(s) in RCA: 107] [Impact Index Per Article: 15.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
|
12
|
Xiao KJ, Chu L, Yu JQ. Enantioselective C-H Olefination of α-Hydroxy and α-Amino Phenylacetic Acids by Kinetic Resolution. Angew Chem Int Ed Engl 2016; 55:2856-60. [PMID: 26800040 DOI: 10.1002/anie.201510808] [Citation(s) in RCA: 91] [Impact Index Per Article: 11.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2015] [Indexed: 11/06/2022]
Abstract
Significant progress has been made in the past decade regarding the development of enantioselective C-H activation reactions by desymmetrization. However, the requirement for the presence of two chemically identical prochiral C-H bonds represents an inherent limitation in scope. Reported is the first example of kinetic resolution by a palladium(II)-catalyzed enantioselective C-H activation and C-C bond formation, thus significantly expanding the scope of enantioselective C-H activation reactions.
Collapse
Affiliation(s)
- Kai-Jiong Xiao
- Department of Chemistry, The Scripps Research Institution, 10550 N. Torrey Pines Road, La Jolla, CA, 92037, USA
| | - Ling Chu
- Department of Chemistry, The Scripps Research Institution, 10550 N. Torrey Pines Road, La Jolla, CA, 92037, USA
| | - Jin-Quan Yu
- Department of Chemistry, The Scripps Research Institution, 10550 N. Torrey Pines Road, La Jolla, CA, 92037, USA.
| |
Collapse
|
13
|
Xiao KJ, Chu L, Yu JQ. Enantioselective C−H Olefination of α-Hydroxy and α-Amino Phenylacetic Acids by Kinetic Resolution. Angew Chem Int Ed Engl 2016. [DOI: 10.1002/ange.201510808] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Kai-Jiong Xiao
- Department of Chemistry; The Scripps Research Institution; 10550 N. Torrey Pines Road La Jolla CA 92037 USA
| | - Ling Chu
- Department of Chemistry; The Scripps Research Institution; 10550 N. Torrey Pines Road La Jolla CA 92037 USA
| | - Jin-Quan Yu
- Department of Chemistry; The Scripps Research Institution; 10550 N. Torrey Pines Road La Jolla CA 92037 USA
| |
Collapse
|
14
|
Lithium-stabilized nucleophilic addition of thiamin to a ketone provides an efficient route to mandelylthiamin, a critical pre-decarboxylation intermediate. Bioorg Chem 2015; 62:124-9. [PMID: 26333207 DOI: 10.1016/j.bioorg.2015.08.004] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2015] [Revised: 08/19/2015] [Accepted: 08/20/2015] [Indexed: 11/21/2022]
Abstract
Mandelylthiamin (MTh) is an accurate model of the covalent intermediate derived from the condensation of thiamin diphosphate and benzoylformate in benzoylformate decarboxylase. The properties and catalytic susceptibilities of mandelylthiamin are the subjects of considerable interest. However, the existing synthesis gives only trace amounts of the precursor to MTh as it is conducted under reversible conditions. An improved approach derives from the unique ability of lithium ions to drive to completion the otherwise unfavorable condensation of the conjugate base of thiamin and methyl benzoylformate. The unique efficiency of the condensation reaction in the presence of lithium ions is established in contrast to the effects of other Lewis acids. Interpretation of the pattern of the results indicates that the condensation of the ketone and thiamin is thermodynamically controlled. It is proposed that the addition of lithium ions displaces the equilibrium toward the product through formation of a stable lithium-alkoxide.
Collapse
|
15
|
Gu X, Wang L, Gao YF, Ma W, Li YM, Gong P. The synthesis of enantioenriched α-hydroxy esters. ACTA ACUST UNITED AC 2014. [DOI: 10.1016/j.tetasy.2014.11.004] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
|
16
|
Capitta F, Melis N, Secci F, Romanazzi G, Frongia A. Organocatalytic synthesis of optically active aryllactic acid derivatives from β-ketosulfoxides. J Sulphur Chem 2014. [DOI: 10.1080/17415993.2014.946506] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
Affiliation(s)
- Francesca Capitta
- Dipartimento di Scienze Chimiche e Geologiche, Università degli Studi di Cagliari, Complesso Universitario di Monserrato, S.S. 554, Bivio per Sestu, I-09042 Monserrato (Cagliari), Italy
| | - Nicola Melis
- Dipartimento di Scienze Chimiche e Geologiche, Università degli Studi di Cagliari, Complesso Universitario di Monserrato, S.S. 554, Bivio per Sestu, I-09042 Monserrato (Cagliari), Italy
| | - Francesco Secci
- Dipartimento di Scienze Chimiche e Geologiche, Università degli Studi di Cagliari, Complesso Universitario di Monserrato, S.S. 554, Bivio per Sestu, I-09042 Monserrato (Cagliari), Italy
| | | | - Angelo Frongia
- Dipartimento di Scienze Chimiche e Geologiche, Università degli Studi di Cagliari, Complesso Universitario di Monserrato, S.S. 554, Bivio per Sestu, I-09042 Monserrato (Cagliari), Italy
| |
Collapse
|
17
|
Hahn R, Raabe G, Enders D. Asymmetric synthesis of highly functionalized tetrahydropyrans via a one-pot organocatalytic Michael/Henry/ketalization sequence. Org Lett 2014; 16:3636-9. [PMID: 24971998 PMCID: PMC4700516 DOI: 10.1021/ol501236a] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
A diastereo- and enantioselective Michael/Henry/ketalization sequence to functionalized tetrahydropyrans is described. The multicomponent cascade reaction uses acetylacetone or β-keto esters, β-nitrostyrenes, and alkynyl aldehydes as substrates affording tetrahydropyrans with five contiguous stereocenters. Employing a bifunctional quinine-based squaramide organocatalyst, the title compounds are obtained in moderate to good yields (27-80%), excellent enantiomeric excesses (93-99% ee), and high diastereomeric ratios (dr > 20:1) after one crystallization.
Collapse
Affiliation(s)
- Robert Hahn
- Institute of Organic Chemistry, RWTH Aachen University, Landoltweg 1, 52074 Aachen, Germany
| | - Gerhard Raabe
- Institute of Organic Chemistry, RWTH Aachen University, Landoltweg 1, 52074 Aachen, Germany
| | - Dieter Enders
- Institute of Organic Chemistry, RWTH Aachen University, Landoltweg 1, 52074 Aachen, Germany
| |
Collapse
|
18
|
Yan PC, Xie JH, Zhang XD, Chen K, Li YQ, Zhou QL, Che DQ. Direct asymmetric hydrogenation of α-keto acids by using the highly efficient chiral spiro iridium catalysts. Chem Commun (Camb) 2014; 50:15987-90. [DOI: 10.1039/c4cc07643e] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
The Ir/SpiroPAP catalyzed direct asymmetric hydrogenation of α-keto acids under mild reaction conditions has been developed.
Collapse
Affiliation(s)
- Pu-Cha Yan
- Zhejiang Jiuzhou Pharmaceutical Co., Ltd
- Taizhou City, P. R. China
| | - Jian-Hua Xie
- State Key Laboratory and Institute of Elemento-organic Chemistry
- Nankai University
- Tianjin 300071, P. R. China
- Collaborative Innovation Center of Chemical Science and Engineering (Tianjin)
- Tianjin 300071, P. R. China
| | - Xiang-Dong Zhang
- Zhejiang Jiuzhou Pharmaceutical Co., Ltd
- Taizhou City, P. R. China
| | - Kang Chen
- Zhejiang Jiuzhou Pharmaceutical Co., Ltd
- Taizhou City, P. R. China
| | - Yuan-Qiang Li
- Zhejiang Jiuzhou Pharmaceutical Co., Ltd
- Taizhou City, P. R. China
| | - Qi-Lin Zhou
- State Key Laboratory and Institute of Elemento-organic Chemistry
- Nankai University
- Tianjin 300071, P. R. China
- Collaborative Innovation Center of Chemical Science and Engineering (Tianjin)
- Tianjin 300071, P. R. China
| | - Da-Qing Che
- Zhejiang Jiuzhou Pharmaceutical Co., Ltd
- Taizhou City, P. R. China
- Collaborative Innovation Center of Chemical Science and Engineering (Tianjin)
- Tianjin 300071, P. R. China
| |
Collapse
|