1
|
Jia L, Wang T, Chen J, Zhao H, Yao P, Fan B. B(C 6F 5) 3/Chiral Phosphoric Acid Promoted Asymmetric C-3 gem-Difluoroalkylation of Quinoxalin-2-ones with Difluoroenoxysilanes. Org Lett 2024; 26:6551-6555. [PMID: 39078262 DOI: 10.1021/acs.orglett.4c01958] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/31/2024]
Abstract
The asymmetric Mannich-type reaction of quinoxalin-2-ones with difluoroenoxysilanes has been developed for the synthesis of chiral gem-difluoroalkylated quinoxalin-2-ones. The reaction worked in the presence of chiral phosphoric acid CPA 1 and B(C6F5)3 in THF at room temperature. The reaction exhibited a good substrate scope furnishing the products in good yields (up to 97%) with up to 96% ee.
Collapse
Affiliation(s)
- Li Jia
- Yunnan Key Laboratory of Chiral Functional Substance Research and Application, Yunnan Minzu University, Yuehua Street, Kunming 650504, China
| | - Ting Wang
- Yunnan Key Laboratory of Chiral Functional Substance Research and Application, Yunnan Minzu University, Yuehua Street, Kunming 650504, China
| | - Jingchao Chen
- Yunnan Key Laboratory of Chiral Functional Substance Research and Application, Yunnan Minzu University, Yuehua Street, Kunming 650504, China
- Key Laboratory of Chemistry in Ethnic Medicinal Resources, Yunnan Minzu University, Yuehua Street, Kunming 650500, China
| | - Hongyan Zhao
- Yunnan Key Laboratory of Chiral Functional Substance Research and Application, Yunnan Minzu University, Yuehua Street, Kunming 650504, China
| | - Pengjie Yao
- Yunnan Key Laboratory of Chiral Functional Substance Research and Application, Yunnan Minzu University, Yuehua Street, Kunming 650504, China
| | - Baomin Fan
- Yunnan Key Laboratory of Chiral Functional Substance Research and Application, Yunnan Minzu University, Yuehua Street, Kunming 650504, China
- Key Laboratory of Chemistry in Ethnic Medicinal Resources, Yunnan Minzu University, Yuehua Street, Kunming 650500, China
| |
Collapse
|
2
|
Joseph E, Smith I, Tunge JA. Cobalt-catalyzed decarboxylative difluoroalkylation of nitrophenylacetic acid salts. Chem Sci 2023; 14:13902-13907. [PMID: 38075641 PMCID: PMC10699560 DOI: 10.1039/d3sc05583c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2023] [Accepted: 11/13/2023] [Indexed: 02/12/2024] Open
Abstract
The selective installation of fluorine-containing groups into biologically relevant molecules has been used as a common strategy for the development of pharmaceutically active molecules. However, the selective incorporation of gem-difluoromethylene groups next to sterically demanding secondary and tertiary alkyl groups remains a challenge. Herein, we report the first cobalt-catalyzed regioselective difluoroalkylation of carboxylic acid salts. The reaction allows for the facile construction of various difluoroalkylated products in good yields tolerating a wide range of functionalities on either reaction partner. The potential of the method is illustrated by the late-stage functionalization of molecules of biological relevance. Mechanistic studies support the in situ formation of a cobalt(i) species and the intermediacy of difluoroalkyl radicals, thus suggesting a Co(i)/Co(ii)/Co(iii) catalytic cycle.
Collapse
Affiliation(s)
- Ebbin Joseph
- Department of Chemistry, The University of Kansas 1567 Irving Rd, Lawrence KS 66045 USA
| | - Ian Smith
- Department of Chemistry, The University of Kansas 1567 Irving Rd, Lawrence KS 66045 USA
| | - Jon A Tunge
- Department of Chemistry, The University of Kansas 1567 Irving Rd, Lawrence KS 66045 USA
| |
Collapse
|
3
|
Zou HN, Huang ML, Huang MY, Su YX, Zhang JW, Zhang XY, Zhu SF. Chiral gem-difluoroalkyl reagents: gem-difluoroalkyl propargylic borons and gem-difluoroalkyl α-allenols. Chem Sci 2023; 14:9186-9190. [PMID: 37655040 PMCID: PMC10466307 DOI: 10.1039/d3sc03266c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2023] [Accepted: 08/04/2023] [Indexed: 09/02/2023] Open
Abstract
Chiral fluorinated reagents provide new opportunities for the discovery of drugs and functional materials because the introduction of a fluorinated group significantly alters a molecule's physicochemical properties. Chiral gem-difluoroalkyl fragments (R-CF2-C*) are key motifs in many drugs. However, the scarcity of synthetic methods and types of chiral gem-difluoroalkyl reagents limits the applications of these compounds. Herein, we report two types of chiral gem-difluoroalkyl reagents chiral gem-difluoroalkyl propargylic borons and gem-difluoroalkyl α-allenols and their synthesis by means of methods involving rhodium-catalyzed enantioselective B-H bond insertion reactions of carbenes and Lewis acid-promoted allenylation reactions. The mild, operationally simple method features a broad substrate scope and good functional group tolerance. These two types of reagents contain easily transformable boron and alkynyl or allenyl moieties and thus might facilitate rapid modular construction of chiral molecules containing chiral gem-difluoroalkyl fragments and might provide new opportunities for the discovery of chiral gem-difluoroalkyl drugs and other functional molecules.
Collapse
Affiliation(s)
- Hui-Na Zou
- Frontiers Science Center for New Organic Matter, State Key Laboratory and Institute of Elemento-Organic Chemistry, College of Chemistry, Nankai University Tianjin 300071 China
| | - Meng-Lin Huang
- Frontiers Science Center for New Organic Matter, State Key Laboratory and Institute of Elemento-Organic Chemistry, College of Chemistry, Nankai University Tianjin 300071 China
| | - Ming-Yao Huang
- Frontiers Science Center for New Organic Matter, State Key Laboratory and Institute of Elemento-Organic Chemistry, College of Chemistry, Nankai University Tianjin 300071 China
| | - Yu-Xuan Su
- Frontiers Science Center for New Organic Matter, State Key Laboratory and Institute of Elemento-Organic Chemistry, College of Chemistry, Nankai University Tianjin 300071 China
| | - Jing-Wei Zhang
- Frontiers Science Center for New Organic Matter, State Key Laboratory and Institute of Elemento-Organic Chemistry, College of Chemistry, Nankai University Tianjin 300071 China
| | - Xin-Yu Zhang
- Frontiers Science Center for New Organic Matter, State Key Laboratory and Institute of Elemento-Organic Chemistry, College of Chemistry, Nankai University Tianjin 300071 China
| | - Shou-Fei Zhu
- Frontiers Science Center for New Organic Matter, State Key Laboratory and Institute of Elemento-Organic Chemistry, College of Chemistry, Nankai University Tianjin 300071 China
| |
Collapse
|
4
|
Zhang TY, Wu Y, Liu S, Tao JQ, Yang X, Wang XQ, Duan XH, Guo LN. Iron-Catalyzed Alkoxyl Radical-Induced C-C Bond Cleavage/ gem-Difluoroalkylation Cascade. Org Lett 2023. [PMID: 37262417 DOI: 10.1021/acs.orglett.3c01427] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
An inexpensive iron-catalyzed alkoxyl radical-induced C-C bond cleavage/gem-difluoroalkylation cascade is presented. Regulated by the structure of alkoxyl radical precursors, fluorinated distal diketones were synthesized through a ring-opening strategy and difluoroalkylated medium-sized lactones and macrolactones were constructed via a ring-expansion strategy. Both protocols proceeded under mild and redox neutral conditions with a broad substrate scope and good functional group compatibility.
Collapse
Affiliation(s)
- Tian-Yu Zhang
- Department of Chemistry, School of Chemistry, Xi'an Key Laboratory of Sustainable Energy Material Chemistry and Engineering Research Center of Energy Storage Materials and Devices, Ministry of Education, Xi'an Jiaotong University, Xi'an 710049, P. R. China
| | - Yong Wu
- Department of Chemistry, School of Chemistry, Xi'an Key Laboratory of Sustainable Energy Material Chemistry and Engineering Research Center of Energy Storage Materials and Devices, Ministry of Education, Xi'an Jiaotong University, Xi'an 710049, P. R. China
| | - Shuai Liu
- Department of Chemistry, School of Chemistry, Xi'an Key Laboratory of Sustainable Energy Material Chemistry and Engineering Research Center of Energy Storage Materials and Devices, Ministry of Education, Xi'an Jiaotong University, Xi'an 710049, P. R. China
| | - Jing-Qi Tao
- Department of Chemistry, School of Chemistry, Xi'an Key Laboratory of Sustainable Energy Material Chemistry and Engineering Research Center of Energy Storage Materials and Devices, Ministry of Education, Xi'an Jiaotong University, Xi'an 710049, P. R. China
| | - Xu Yang
- School of Electrical Engineering, Xi'an Jiaotong University, Xi'an 710049, P. R. China
| | - Xue-Qi Wang
- Department of Chemistry, School of Chemistry, Xi'an Key Laboratory of Sustainable Energy Material Chemistry and Engineering Research Center of Energy Storage Materials and Devices, Ministry of Education, Xi'an Jiaotong University, Xi'an 710049, P. R. China
| | - Xin-Hua Duan
- Department of Chemistry, School of Chemistry, Xi'an Key Laboratory of Sustainable Energy Material Chemistry and Engineering Research Center of Energy Storage Materials and Devices, Ministry of Education, Xi'an Jiaotong University, Xi'an 710049, P. R. China
- School of Electrical Engineering, Xi'an Jiaotong University, Xi'an 710049, P. R. China
| | - Li-Na Guo
- Department of Chemistry, School of Chemistry, Xi'an Key Laboratory of Sustainable Energy Material Chemistry and Engineering Research Center of Energy Storage Materials and Devices, Ministry of Education, Xi'an Jiaotong University, Xi'an 710049, P. R. China
| |
Collapse
|
5
|
Sharma S, Monga Y, Gupta A, Singh S. 2-Oxindole and related heterocycles: synthetic methodologies for their natural products and related derivatives. RSC Adv 2023; 13:14249-14267. [PMID: 37179999 PMCID: PMC10173257 DOI: 10.1039/d3ra02217j] [Citation(s) in RCA: 9] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2023] [Accepted: 04/25/2023] [Indexed: 05/15/2023] Open
Abstract
Natural goods, medications, and pharmaceutically active substances all contain substituted oxindoles. Generally, the C-3 stereocenter of the substituents of oxindoles and their absolute arrangement have a substantial impact on the bioactivity of these substances. In this case, the desire for contemporary probe and drug-discovery programs for the synthesis of chiral compounds using desirable scaffolds with high structural diversity further drives research in this field. Also, the new synthetic techniques are generally simple to apply for the synthesis of other similar scaffolds. Herein, we review the distinct approaches for the synthesis of diverse useful oxindole scaffolds. Specifically, the research findings on the naturally existing 2-oxindole core and a variety of synthetic compounds having a 2-oxindole core are discussed. We present an overview of the construction of oxindole-based synthetic and natural products. In addition, the chemical reactivity of 2-oxindole and its related derivatives in the presence of chiral and achiral catalysts are thoroughly discussed. The data compiled herein provides broad information related to the bioactive product design, development, and applications of 2-oxindoles and the reported techniques will be helpful for the investigation of novel reactions in the future.
Collapse
Affiliation(s)
- Shivangi Sharma
- Department of Applied Chemistry, Amity School of Engineering and Technology, Amity University Madhya Pradesh Gwalior Madhya Pradesh-474 005 India
| | - Yukti Monga
- Shyamlal College, Department of Chemistry, University of Delhi Delhi-110032 India
| | - Ashu Gupta
- Shyamlal College, Department of Chemistry, University of Delhi Delhi-110032 India
| | - Shivendra Singh
- Department of Applied Chemistry, Amity School of Engineering and Technology, Amity University Madhya Pradesh Gwalior Madhya Pradesh-474 005 India
| |
Collapse
|
6
|
Sanz-Marco A, Esperilla D, Montesinos-Magraner M, Vila C, Muñoz MC, Pedro JR, Blay G. A Cu-BOX catalysed enantioselective Mukaiyama-aldol reaction with difluorinated silyl enol ethers and acylpyridine N-oxides. Org Biomol Chem 2023; 21:345-350. [PMID: 36484719 DOI: 10.1039/d2ob01763f] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
A Cu(II)/BOX complex catalyses the enantioselective addition of difluorinated silyl enol ethers to acylpyridine N-oxides. The reaction provides difluorinated chiral tertiary alcohols of great interest in medicinal chemistry. These compounds are obtained in moderate to excellent yields and with high enantioselectivities. The stereochemical outcome of the reaction has been explained by DFT calculations.
Collapse
Affiliation(s)
- Amparo Sanz-Marco
- Departament de Química Orgànica-Facultat de Química, Universitat de València, C/Dr. Moliner 50, 46100-Burjassot, València, Spain.
| | - Daniel Esperilla
- Departament de Química Orgànica-Facultat de Química, Universitat de València, C/Dr. Moliner 50, 46100-Burjassot, València, Spain.
| | - Marc Montesinos-Magraner
- Departament de Química Orgànica-Facultat de Química, Universitat de València, C/Dr. Moliner 50, 46100-Burjassot, València, Spain.
| | - Carlos Vila
- Departament de Química Orgànica-Facultat de Química, Universitat de València, C/Dr. Moliner 50, 46100-Burjassot, València, Spain.
| | - M Carmen Muñoz
- Departament de Física Aplicada, Universitat Politècnica de València, C/Cami de Vera s/n, 46022-València, Spain
| | - José R Pedro
- Departament de Química Orgànica-Facultat de Química, Universitat de València, C/Dr. Moliner 50, 46100-Burjassot, València, Spain.
| | - Gonzalo Blay
- Departament de Química Orgànica-Facultat de Química, Universitat de València, C/Dr. Moliner 50, 46100-Burjassot, València, Spain.
| |
Collapse
|
7
|
Uno H, Kawai K, Araki T, Shiro M, Shibata N. Enantio-, Diastereo- and Regioselective Synthesis of Chiral Cyclic and Acyclic gem-Difluoromethylenes by Palladium-Catalyzed [4+2] Cycloaddition. Angew Chem Int Ed Engl 2022; 61:e202117635. [PMID: 35344247 DOI: 10.1002/anie.202117635] [Citation(s) in RCA: 14] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/27/2021] [Indexed: 12/25/2022]
Abstract
gem-Difluoromethylene moieties are attractive in medicinal chemistry due to their ability to mimic other more ubiquitous functional groups. Thus, effective asymmetric methods for their construction are highly desirable, especially for the industrial production of chiral drugs. Using a Pd-catalyzed asymmetric [4+2] cycloaddition between substituted-2-alkylidenetrimethylene carbonates and gem-difluoroalkyl ketones, we were able to easily access chiral 1,3-dioxanes that contain a tetrasubstituted difluoroalkyl stereogenic center in cyclic and acyclic skeletons. A novel phosphoramidite ligand, which contains a bulky 1,1-dinaphthylmethanamino moiety, was developed to provide the products in high yield with excellent enantio-, diastereo-, and regioselectivity. Strikingly, the gem-difluoro substitution pattern promotes the reaction, and pentafluoroethylketone, an α,α-difluorinated β-ketoester, and a β-ketosulfone are suitable substrates for this method.
Collapse
Affiliation(s)
- Hiroto Uno
- Department of Nanopharmaceutical Sciences & Department of Life Science and Applied Chemistry, Nagoya Institute of Technology, Gokiso, Showa-ku, Nagoya, 466-8555, Japan
| | - Koki Kawai
- Department of Nanopharmaceutical Sciences & Department of Life Science and Applied Chemistry, Nagoya Institute of Technology, Gokiso, Showa-ku, Nagoya, 466-8555, Japan
| | - Taichi Araki
- Department of Nanopharmaceutical Sciences & Department of Life Science and Applied Chemistry, Nagoya Institute of Technology, Gokiso, Showa-ku, Nagoya, 466-8555, Japan
| | - Motoo Shiro
- Rigaku Corporation, 3-9-12, Matsubara-cho, Akishima-shi, Tokyo, 196-8666, Japan
| | - Norio Shibata
- Department of Nanopharmaceutical Sciences & Department of Life Science and Applied Chemistry, Nagoya Institute of Technology, Gokiso, Showa-ku, Nagoya, 466-8555, Japan
| |
Collapse
|
8
|
Ma S, Zhou P, Fan X, Li D, Yang J. Base-promoted cascade radical difluoroalkylation/cyclization of acrylamides for the synthesis of CF2-containing oxindoles and isoquinoline-1,3-diones. Tetrahedron Lett 2022. [DOI: 10.1016/j.tetlet.2022.153933] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
|
9
|
Patra K, Reddy MK, Mallik S, Baidya M. Divergent Reaction of Activated Pyridines with α,α-Difluorinated gem-Diols: Regioselective Synthesis of gem-Difluorinated Dihydropyridines and Dihydropyridones. Org Lett 2022; 24:4014-4018. [PMID: 35613433 DOI: 10.1021/acs.orglett.2c01445] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The nucleophilic reactivity of α,α-difluorinated gem-diols toward activated pyridinium salts has been capitalized in a highly regioselective fashion, offering biologically relevant 1,4-dihydropyridines and 3,4-dihydro-2-pyridones adorned with the valuable gem-difluoromethylene motif. The protocol is scalable as well as high yielding and accommodates a broad range of substrates and functional groups. Additionally, the synthesis of difluorinated oxa-azabicyclo[3.3.1]nonane frameworks has been showcased through product diversification.
Collapse
Affiliation(s)
- Koushik Patra
- Department of Chemistry, Indian Institute of Technology Madras, Chennai 600 036, Tamil Nadu, India
| | - Mallu Kesava Reddy
- Department of Chemistry, Indian Institute of Technology Madras, Chennai 600 036, Tamil Nadu, India
| | - Sumitava Mallik
- Department of Chemistry, Indian Institute of Technology Madras, Chennai 600 036, Tamil Nadu, India
| | - Mahiuddin Baidya
- Department of Chemistry, Indian Institute of Technology Madras, Chennai 600 036, Tamil Nadu, India
| |
Collapse
|
10
|
Uno H, Kawai K, Araki T, Shiro M, Shibata N. Enantio‐, Diastereo‐ and Regioselective Synthesis of Chiral Cyclic and Acyclic gem‐Difluoromethylenes by Palladium‐Catalyzed [4+2] Cycloaddition. Angew Chem Int Ed Engl 2022. [DOI: 10.1002/ange.202117635] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Hiroto Uno
- Nagoya Kogyo Daigaku Nano Medicine Kagaku Senko Department of Nanophamaceutical Sciences JAPAN
| | - Koki Kawai
- Nagoya Kogyo Daigaku Department of Chemistry JAPAN
| | - Taichi Araki
- Nagoya Kogyo Daigaku Department of Chemistry JAPAN
| | - Motoo Shiro
- Rigaku Kenkyujo Kakushin chino togo kenkyu senta Non JAPAN
| | - Norio Shibata
- Nagoya Kogyo Daigaku Nano Medicine Kagaku Senko Department of Nanopharmaceutical Science and Department of Frontier Materials Gokiso, Showa-kuNagare College 466-8555 Nagoya JAPAN
| |
Collapse
|
11
|
García-Ramos M, Lavandera I. Transaminases as suitable catalysts for the synthesis of enantiopure β,β-difluoroamines. Org Biomol Chem 2022; 20:984-988. [PMID: 35040845 DOI: 10.1039/d1ob02346b] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
Transaminases have shown the ability to catalyze the amination of a series of aliphatic and (hetero)aromatic α,α-difluorinated ketones with high stereoselectivity, thus providing the corresponding β,β-difluoroamines in high isolated yields (55-82%) and excellent enantiomeric excess (>99%). It was also observed that these activated substrates could be quantitatively transformed by employing a small molar excess of the amine donor since this amination process was thermodynamically favored. Selected transformations could be scaled up to 500 mg, showing the robustness of this methodology.
Collapse
Affiliation(s)
- Marina García-Ramos
- Organic and Inorganic Chemistry Department, University of Oviedo, Avenida Julián Clavería 8, 33006 Oviedo, Spain.
| | - Iván Lavandera
- Organic and Inorganic Chemistry Department, University of Oviedo, Avenida Julián Clavería 8, 33006 Oviedo, Spain.
| |
Collapse
|
12
|
Wang Y, Liu R, Zhou P, Wu J, Li W, Wang C, Li H, Li D, Yang J. Visible Light‐Driven Base‐Promoted Radical Cascade Difluoroalkylization‐cyclization‐iodination of 1,6‐Enynes with Ethyl Difluoroiodoacetate. European J Org Chem 2022. [DOI: 10.1002/ejoc.202101395] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Yan Wang
- Ningxia University School of chemistry and chemical Engineering 539 West Helan Mountains road, Xixia District, Yinchuan 750000 Yinchuan CHINA
| | - Ruyan Liu
- Ningxia University School of Chemistry and Chemical Engineering CHINA
| | - Pengsheng Zhou
- Ningxia University School of Chemistry and Chemical Engineering CHINA
| | - Jianglong Wu
- Ningxia University School of Chemistry and Chemical Engineering CHINA
| | - Wenshuang Li
- Ningxia University School of Chemistry and Chemical Engineering CHINA
| | - Chenyu Wang
- Ningxia University School of Chemistry and Chemical Engineering CHINA
| | - Hao Li
- Ningxia University School of Chemistry and Chemical Engineering CHINA
| | - Dianjun Li
- Ningxia University State Key Laboratory of High-Efficiency Utilization of Coal and Green Chemical Engineering, School of Chemistry and Chemical Engineering CHINA
| | - Jinhui Yang
- Ningxia University State Key Laboratory of High-efficiency Utilization of Coal and Green Chemical Engineering China, Ning Xia, Yinchuan, Xixia District Ningxia University B 750021 Yinchuan CHINA
| |
Collapse
|
13
|
Xiong W, Qin WB, Zhao YS, Fu KZ, Liu GK. Direct C(sp3)−H Difluoromethylation via Radical-Radical Cross-Coupling by Visible-Light Photoredox Catalysis. Org Chem Front 2022. [DOI: 10.1039/d2qo00192f] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Herein, the radical-radical cross-coupling strategy for direct difluoromethylation of C(sp3)−H bond is reported. This transformation was readily accomplished under transition metal-free photoredox catalysis in the presence of 3 mol% of...
Collapse
|
14
|
Huang S, Tong FF, Bai DC, Zhang GP, Jiang YJ, Zhang B, Leng X, Guo YL, Wan XL, Zhang X, Ding CH, Hou XL. Regio- and enantioselective umpolung gem-difluoroallylation of hydrazones via palladium catalysis enabled by N-heterocyclic carbene ligand. Nat Commun 2021; 12:6551. [PMID: 34772944 PMCID: PMC8589859 DOI: 10.1038/s41467-021-26667-0] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2021] [Accepted: 10/11/2021] [Indexed: 11/09/2022] Open
Abstract
The enantioselective construction of C-CF2R (R: alkyl or fluoroalkyl) bonds has attracted the attention of synthetic chemists because of the importance of chiral fluorinated compounds in life and materials sciences. Catalytic asymmetric fluoroalkylation has mainly been realized under organocatalysis and Lewis acid catalysis, with substrates limited to carbonyl compounds. Few examples using transition-metal catalysis exist, owing to side reactions including decomposition and isomerization of fluoroalkylating reagents. Herein we report umpolung asymmetric difluoroallylation of hydrazones with 3-bromo-3,3-difluoropropene (BDFP) under palladium catalysis. Difluoroallylation products having quaternary chiral carbon centers are afforded in good yields with high α/γ- and enantioselectivities. The usefulness of the reaction products is demonstrated and an inner-sphere mechanism of the reaction is proposed. The use of chiral N-heterocyclic carbene as ligand is the key for the selectivities as well as the productivity of the reaction.
Collapse
Affiliation(s)
- Shuai Huang
- grid.422150.00000 0001 1015 4378State Key Laboratory of Organometallic Chemistry, Center for Excellence in Molecular Synthesis, Shanghai Institute of Organic Chemistry (SIOC), Chinese Academy of Sciences (CAS), Shanghai, China
| | - Fei-Fei Tong
- grid.422150.00000 0001 1015 4378Key Laboratory of Organofluorine Chemistry, Center for Excellence in Molecular Synthesis, SIOC, CAS, Shanghai, China
| | - Da-Chang Bai
- grid.422150.00000 0001 1015 4378State Key Laboratory of Organometallic Chemistry, Center for Excellence in Molecular Synthesis, Shanghai Institute of Organic Chemistry (SIOC), Chinese Academy of Sciences (CAS), Shanghai, China
| | - Gao-Peng Zhang
- grid.422150.00000 0001 1015 4378State Key Laboratory of Organometallic Chemistry, Center for Excellence in Molecular Synthesis, Shanghai Institute of Organic Chemistry (SIOC), Chinese Academy of Sciences (CAS), Shanghai, China
| | - Yang-Jie Jiang
- grid.422150.00000 0001 1015 4378State Key Laboratory of Organometallic Chemistry, Center for Excellence in Molecular Synthesis, Shanghai Institute of Organic Chemistry (SIOC), Chinese Academy of Sciences (CAS), Shanghai, China
| | - Bo Zhang
- grid.422150.00000 0001 1015 4378State Key Laboratory of Organometallic Chemistry, Center for Excellence in Molecular Synthesis, Shanghai Institute of Organic Chemistry (SIOC), Chinese Academy of Sciences (CAS), Shanghai, China
| | - Xuebing Leng
- grid.422150.00000 0001 1015 4378State Key Laboratory of Organometallic Chemistry, Center for Excellence in Molecular Synthesis, Shanghai Institute of Organic Chemistry (SIOC), Chinese Academy of Sciences (CAS), Shanghai, China
| | - Ying-Long Guo
- grid.422150.00000 0001 1015 4378State Key Laboratory of Organometallic Chemistry, Center for Excellence in Molecular Synthesis, Shanghai Institute of Organic Chemistry (SIOC), Chinese Academy of Sciences (CAS), Shanghai, China
| | - Xiao-Long Wan
- grid.422150.00000 0001 1015 4378Department of Analytic Chemistry, Center for Excellence in Molecular Synthesis, SIOC, CAS, Shanghai, China
| | - Xingang Zhang
- Key Laboratory of Organofluorine Chemistry, Center for Excellence in Molecular Synthesis, SIOC, CAS, Shanghai, China.
| | - Chang-Hua Ding
- Department of Chemistry, Innovative Drug Research Center, Shanghai University, Shanghai, China.
| | - Xue-Long Hou
- State Key Laboratory of Organometallic Chemistry, Center for Excellence in Molecular Synthesis, Shanghai Institute of Organic Chemistry (SIOC), Chinese Academy of Sciences (CAS), Shanghai, China. .,Shanghai-Hong Kong Joint Laboratory in Chemical Synthesis, SIOC, CAS, Shanghai, China.
| |
Collapse
|
15
|
Li X, He S, Song Q. Rapid incorporation of a difluoroacetate radical into para-quinone methides via radical 1,6-conjugate addition. Chem Commun (Camb) 2021; 57:6035-6038. [PMID: 34037000 DOI: 10.1039/d1cc02149d] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Presented herein is a newly designed strategy that rapidly introduces ethyl difluoroacetate radicals through a dialkylzincs induced radical 1,6-conjugate addition pathway. Besides achieving high yields and excellent functional group compatibility, this protocol allowed the incorporation of a gem-difluoromethylene motif to be accomplished within minutes.
Collapse
Affiliation(s)
- Xin Li
- Institute of Next Generation Matter Transformation, College of Materials Science & Engineering, Huaqiao University, 668 Jimei Blvd, Xiamen 361021, Fujian, China.
| | - Songtao He
- Institute of Next Generation Matter Transformation, College of Materials Science & Engineering, Huaqiao University, 668 Jimei Blvd, Xiamen 361021, Fujian, China.
| | - Qiuling Song
- Institute of Next Generation Matter Transformation, College of Materials Science & Engineering, Huaqiao University, 668 Jimei Blvd, Xiamen 361021, Fujian, China. and State Key Laboratory of Organometallic Chemistry and Key Laboratory of Organofluorine Chemistry, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, Shanghai 200032, China
| |
Collapse
|
16
|
He JX, Zhang ZH, Mu BS, Cui XY, Zhou J, Yu JS. Catalyst-Free and Solvent-Controlled Divergent Synthesis of Difluoromethylene-Containing S-Heterocycles. J Org Chem 2021; 86:9206-9217. [DOI: 10.1021/acs.joc.1c00754] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Affiliation(s)
- Jun-Xiong He
- Shanghai Engineering Research Center of Molecular Therapeutics and New Drug Development and Shanghai Key Laboratory of Green Chemistry and Chemical Processes, East China Normal University, Shanghai 200062, P. R. China
| | - Zhi-Hao Zhang
- Shanghai Engineering Research Center of Molecular Therapeutics and New Drug Development and Shanghai Key Laboratory of Green Chemistry and Chemical Processes, East China Normal University, Shanghai 200062, P. R. China
| | - Bo-Shuai Mu
- Shanghai Engineering Research Center of Molecular Therapeutics and New Drug Development and Shanghai Key Laboratory of Green Chemistry and Chemical Processes, East China Normal University, Shanghai 200062, P. R. China
| | - Xiao-Yuan Cui
- Shanghai Engineering Research Center of Molecular Therapeutics and New Drug Development and Shanghai Key Laboratory of Green Chemistry and Chemical Processes, East China Normal University, Shanghai 200062, P. R. China
| | - Jian Zhou
- Shanghai Engineering Research Center of Molecular Therapeutics and New Drug Development and Shanghai Key Laboratory of Green Chemistry and Chemical Processes, East China Normal University, Shanghai 200062, P. R. China
- State Key Laboratory of Organometallic Chemistry, Shanghai Institute of Organic Chemistry, Shanghai 200032, P. R. China
| | - Jin-Sheng Yu
- Shanghai Engineering Research Center of Molecular Therapeutics and New Drug Development and Shanghai Key Laboratory of Green Chemistry and Chemical Processes, East China Normal University, Shanghai 200062, P. R. China
- Key Laboratory of Tropical Medicinal Resource Chemistry of Ministry of Education, Hainan Normal University, Haikou 571158, P. R. China
| |
Collapse
|
17
|
Affiliation(s)
- Manfred Braun
- Institute of Organic and Macromolecular Chemistry Heinrich-Heine-University Düsseldorf Universitätsstr. 1 40225 Düsseldorf Germany
| |
Collapse
|
18
|
Gao F, Li B, Wang Y, Chen Q, Li Y, Wang K, Yan W. Stereoselective synthetic strategies of stereogenic carbon centers featuring a difluoromethyl group. Org Chem Front 2021. [DOI: 10.1039/d1qo00032b] [Citation(s) in RCA: 18] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
The scope of this review is to summarize routine asymmetric synthetic methods which enable the effective and selective introduction of difluoromethyl groups into the desired compounds, providing a general introduction to this important research area.
Collapse
Affiliation(s)
- Fengyun Gao
- The Institute of Pharmacology
- Key Laboratory of Preclinical Study for New Drugs of Gansu Province
- School of Basic Medical Sciences
- Lanzhou University
- Lanzhou 730000
| | - Boyu Li
- Department of Chemistry
- University of Liverpool
- Liverpool L69 7ZD
- UK
| | - Yalan Wang
- The Institute of Pharmacology
- Key Laboratory of Preclinical Study for New Drugs of Gansu Province
- School of Basic Medical Sciences
- Lanzhou University
- Lanzhou 730000
| | - Qushuo Chen
- The Institute of Pharmacology
- Key Laboratory of Preclinical Study for New Drugs of Gansu Province
- School of Basic Medical Sciences
- Lanzhou University
- Lanzhou 730000
| | - Yongzhen Li
- The Institute of Pharmacology
- Key Laboratory of Preclinical Study for New Drugs of Gansu Province
- School of Basic Medical Sciences
- Lanzhou University
- Lanzhou 730000
| | - Kairong Wang
- The Institute of Pharmacology
- Key Laboratory of Preclinical Study for New Drugs of Gansu Province
- School of Basic Medical Sciences
- Lanzhou University
- Lanzhou 730000
| | - Wenjin Yan
- The Institute of Pharmacology
- Key Laboratory of Preclinical Study for New Drugs of Gansu Province
- School of Basic Medical Sciences
- Lanzhou University
- Lanzhou 730000
| |
Collapse
|
19
|
Zhang XJ, Cheng YM, Zhao XW, Cao ZY, Xiao X, Xu Y. Catalytic asymmetric synthesis of monofluoroalkenes and gem-difluoroalkenes: advances and perspectives. Org Chem Front 2021. [DOI: 10.1039/d0qo01630f] [Citation(s) in RCA: 30] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
The latest achievements in the catalytic asymmetric synthesis of both monofluoro- and gem-difluoroalkenes are discussed.
Collapse
Affiliation(s)
- Xiao-Juan Zhang
- College of Chemistry and Chemical Engineering
- Henan University
- Kaifeng 475004
- China
| | - Ya-Min Cheng
- College of Chemistry and Chemical Engineering
- Henan University
- Kaifeng 475004
- China
| | - Xiao-Wei Zhao
- College of Chemistry and Chemical Engineering
- Henan University
- Kaifeng 475004
- China
| | - Zhong-Yan Cao
- College of Chemistry and Chemical Engineering
- Henan University
- Kaifeng 475004
- China
| | - Xiao Xiao
- Collaborative Innovation Center of Yangtze River Delta Region Green Pharmaceuticals
- Zhejiang University of Technology
- Hangzhou 310014
- China
| | - Ying Xu
- College of Chemistry and Chemical Engineering
- Henan University
- Kaifeng 475004
- China
- Engineering Research Center for Water Environment and Health of Henan
| |
Collapse
|
20
|
Sumii Y, Nagasaka T, Wang J, Uno H, Shibata N. Synthesis of Chiral gem-Difluoromethylene Compounds by Enantioselective Ethoxycarbonyldifluoromethylation of MBH Fluorides via Silicon-Assisted C-F Bond Activation. J Org Chem 2020; 85:15699-15707. [PMID: 33146018 DOI: 10.1021/acs.joc.0c02201] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
The enantioselective ethoxycarbonyldifluoromethylation of Morita-Baylis-Hillman (MBH) fluorides with Me3SiCF2CO2Et under organocatalysis is described. Moderately functionalized chiral gem-difluoromethylene compounds with a stereogenic "C-CF2-C*" unit were synthesized in high yields with high enantioselectivities. The initial C-F bond activation is assisted by the silicon atom via a dual SN2'-SN2' stepwise pathway. Dynamic kinetic resolution of the MBH-fluorides explained the high yields and high ee's of the products. The method was extended to the enantioselective introduction of "Het-CF2" units.
Collapse
Affiliation(s)
- Yuji Sumii
- Department of Life Science and Applied Chemistry, Department of Nanopharmaceutical Sciences, Nagoya Institute of Technology, Gokiso, Showa-ku, Nagoya 466-5888, Japan
| | - Takato Nagasaka
- Department of Life Science and Applied Chemistry, Department of Nanopharmaceutical Sciences, Nagoya Institute of Technology, Gokiso, Showa-ku, Nagoya 466-5888, Japan
| | - Jiandong Wang
- Department of Life Science and Applied Chemistry, Department of Nanopharmaceutical Sciences, Nagoya Institute of Technology, Gokiso, Showa-ku, Nagoya 466-5888, Japan
| | - Hiroto Uno
- Department of Life Science and Applied Chemistry, Department of Nanopharmaceutical Sciences, Nagoya Institute of Technology, Gokiso, Showa-ku, Nagoya 466-5888, Japan
| | - Norio Shibata
- Department of Life Science and Applied Chemistry, Department of Nanopharmaceutical Sciences, Nagoya Institute of Technology, Gokiso, Showa-ku, Nagoya 466-5888, Japan.,Institute of Advanced Fluorine-Containing Materials, Zhejiang Normal University, 688 Yingbin Avenue, 321004 Jinhua, China
| |
Collapse
|
21
|
Pan B, Shi Y, Tian Y, Zhou Y, Zhou J, Yu J. Synthesis of Multifunctional
α
,
α
‐Difluoroketones through Allylic Alkylation of Difluoroenoxysilanes with MBH Carbonates. Chem Asian J 2020; 15:4028-4032. [DOI: 10.1002/asia.202001145] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2020] [Revised: 10/19/2020] [Indexed: 12/14/2022]
Affiliation(s)
- Bo‐Wen Pan
- College of Pharmacy Guizhou University of Traditional Chinese Medicine Guiyang 550025 P. R. China
| | - Yang Shi
- College of Pharmacy Guizhou University of Traditional Chinese Medicine Guiyang 550025 P. R. China
| | - You‐Ping Tian
- College of Pharmacy Guizhou University of Traditional Chinese Medicine Guiyang 550025 P. R. China
| | - Ying Zhou
- College of Pharmacy Guizhou University of Traditional Chinese Medicine Guiyang 550025 P. R. China
| | - Jian Zhou
- College of Pharmacy Guizhou University of Traditional Chinese Medicine Guiyang 550025 P. R. China
- Shanghai Engineering Research Center of Molecular Therapeutics and New Drug Development Shanghai Key Laboratory of Green Chemistry and Chemical Processes East China Normal University Shanghai 200062 P. R. China
- State Key Laboratory of Organometallic Chemistry Shanghai Institute of Organic Chemistry, CAS Shanghai 200032 P.R. China
| | - Jin‐Sheng Yu
- Shanghai Engineering Research Center of Molecular Therapeutics and New Drug Development Shanghai Key Laboratory of Green Chemistry and Chemical Processes East China Normal University Shanghai 200062 P. R. China
| |
Collapse
|
22
|
Hao YJ, Gong Y, Zhou Y, Zhou J, Yu JS. Construction of β-Quaternary α,α-Difluoroketones via Catalytic Nucleophilic Substitution of Tertiary Alcohols with Difluoroenoxysilanes. Org Lett 2020; 22:8516-8521. [DOI: 10.1021/acs.orglett.0c03123] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Affiliation(s)
- Yong-Jia Hao
- College of Pharmacy, Guizhou University of Traditional Chinese Medicine, Guiyang 550025, China
| | - Yi Gong
- Shanghai Engineering Research Center of Molecular Therapeutics and New Drug Development, Shanghai Key Laboratory of Green Chemistry and Chemical Processes, School of Chemistry and Molecular Engineering, East China Normal University, Shanghai 200062, China
| | - Ying Zhou
- College of Pharmacy, Guizhou University of Traditional Chinese Medicine, Guiyang 550025, China
| | - Jian Zhou
- Shanghai Engineering Research Center of Molecular Therapeutics and New Drug Development, Shanghai Key Laboratory of Green Chemistry and Chemical Processes, School of Chemistry and Molecular Engineering, East China Normal University, Shanghai 200062, China
- State Key Laboratory of Organometallic Chemistry, Shanghai Institute of Organic Chemistry, CAS, Shanghai 200032, China
| | - Jin-Sheng Yu
- Shanghai Engineering Research Center of Molecular Therapeutics and New Drug Development, Shanghai Key Laboratory of Green Chemistry and Chemical Processes, School of Chemistry and Molecular Engineering, East China Normal University, Shanghai 200062, China
| |
Collapse
|
23
|
Feng S, Tang Y, Yang C, Shen C, Dong K. Synthesis of Enantioenriched α,α-Difluoro-β-arylbutanoic Esters by Pd-Catalyzed Asymmetric Hydrogenation. Org Lett 2020; 22:7508-7512. [PMID: 32945684 DOI: 10.1021/acs.orglett.0c02700] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
Synthesis of optically active gem-difluorinated organic molecules attracts a great deal of interest due to their unique properties in pharmaceutical and agrochemical areas. Herein, a series of enantioenriched α,α-difluoro-β-arylbutanoic esters were prepared in high yields (83-99%) with moderate to excellent enantioselectivities (≤97:3 er) by palladium-catalyzed asymmetric hydrogenation.
Collapse
Affiliation(s)
- Sitian Feng
- Chang-Kung Chuang Institute and Shanghai Key Laboratory of Green Chemistry and Chemical Processes, School of Chemistry and Molecular Engineering, East China Normal University, Shanghai 200062, P. R. China
| | - Yitian Tang
- Chang-Kung Chuang Institute and Shanghai Key Laboratory of Green Chemistry and Chemical Processes, School of Chemistry and Molecular Engineering, East China Normal University, Shanghai 200062, P. R. China
| | - Chenjue Yang
- Chang-Kung Chuang Institute and Shanghai Key Laboratory of Green Chemistry and Chemical Processes, School of Chemistry and Molecular Engineering, East China Normal University, Shanghai 200062, P. R. China
| | - Chaoren Shen
- Chang-Kung Chuang Institute and Shanghai Key Laboratory of Green Chemistry and Chemical Processes, School of Chemistry and Molecular Engineering, East China Normal University, Shanghai 200062, P. R. China
| | - Kaiwu Dong
- Chang-Kung Chuang Institute and Shanghai Key Laboratory of Green Chemistry and Chemical Processes, School of Chemistry and Molecular Engineering, East China Normal University, Shanghai 200062, P. R. China
| |
Collapse
|
24
|
Miller E, Kim S, Gibson K, Derrick JS, Toste FD. Regio- and Enantioselective Bromocyclization of Difluoroalkenes as a Strategy to Access Tetrasubstituted Difluoromethylene-Containing Stereocenters. J Am Chem Soc 2020; 142:8946-8952. [PMID: 32352775 PMCID: PMC7508160 DOI: 10.1021/jacs.0c02331] [Citation(s) in RCA: 43] [Impact Index Per Article: 10.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Difluoromethylene-containing compounds have attracted substantial research interest over the past decades for their ability to mimic biological functions of traditional functional groups while providing a wide variety of pharmacological benefits bestowed by the C-F bond. We report a novel strategy to access RCF2Br-containing heterocycles by regio- and enantioselective bromocyclization of difluoroalkenes enabled by chiral anion phase-transfer catalysis. The utility of this methodology was highlighted through a synthesis of an analogue of efavirenz, a drug used for treating HIV. Additionally, the synthetic versatility of the CF2Br intermediates was showcased through functionalization to a variety of enantioenriched α,α-difluoromethylene-containing products.
Collapse
Affiliation(s)
- Edward Miller
- Department of Chemistry, University of California, Berkeley, California 94720, United States
| | - Suhong Kim
- Department of Chemistry, University of California, Berkeley, California 94720, United States
| | - Katarina Gibson
- Department of Chemistry, University of California, Berkeley, California 94720, United States
| | - Jeffrey S Derrick
- Department of Chemistry, University of California, Berkeley, California 94720, United States
| | - F Dean Toste
- Department of Chemistry, University of California, Berkeley, California 94720, United States
| |
Collapse
|
25
|
Ding PG, Zhou F, Wang X, Zhao QH, Yu JS, Zhou J. H-bond donor-directed switching of diastereoselectivity in the Michael addition of α-azido ketones to nitroolefins. Chem Sci 2020; 11:3852-3861. [PMID: 34122853 PMCID: PMC8152593 DOI: 10.1039/d0sc00475h] [Citation(s) in RCA: 21] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
Abstract
The development of catalyst-controlled stereodivergent asymmetric catalysis is important for providing facile access to all stereoisomers of chiral products with multiple stereocenters from the same starting materials. Despite progress, new design strategies for diastereodivergent asymmetric catalysis are still highly desirable. Here we report the potency of H-bond donors as the governing factor to tune diastereoselectivity in a highly diastereoselective switchable enantioselective Michael addition of α-azido ketones to nitroolefins. While a newly developed bifunctional tertiary amine, phosphoramide, preferentially afforded syn-adducts, an analogous squaramide catalyst selectively gave anti-adducts. The resulting multifunctional tertiary azides can be converted to spiro-pyrrolidines with four continuous stereocenters in a one-pot operation. Mechanistic studies cast light on the control of diastereoselectivity by H-bond donors. While the squaramide-catalyzed reaction proceeded with a transition state with both squaramide N–H bonds binding to an enolate intermediate, an unprecedented model was proposed for the phosphoramide-mediated reaction wherein an amide N–H bond and an alkylammonium ion formed in situ interact with nitroolefins, with the enolate stabilized by nonclassical C–H⋯O hydrogen-bonding interactions. We report the successful reversal of the diastereoselectivity in an unprecedented Michael addition of α-azido ketones to nitroolefins catalyzed by bifunctional tertiary amines, simply by varying the H-bond donor from phosphoramide to squaramide.![]()
Collapse
Affiliation(s)
- Pei-Gang Ding
- Shanghai Engineering Research Center of Molecular Therapeutics and New Drug Development, Shanghai Key Laboratory of Green Chemistry and Chemical Processes, School of Chemistry and Molecular Engineering, East China Normal University 3663N Zhongshan Road Shanghai 200062 China
| | - Feng Zhou
- Shanghai Engineering Research Center of Molecular Therapeutics and New Drug Development, Shanghai Key Laboratory of Green Chemistry and Chemical Processes, School of Chemistry and Molecular Engineering, East China Normal University 3663N Zhongshan Road Shanghai 200062 China
| | - Xin Wang
- College of Chemistry, Sichuan University Chengdu Sichuan 610064 China
| | - Qiu-Hua Zhao
- Shanghai Engineering Research Center of Molecular Therapeutics and New Drug Development, Shanghai Key Laboratory of Green Chemistry and Chemical Processes, School of Chemistry and Molecular Engineering, East China Normal University 3663N Zhongshan Road Shanghai 200062 China
| | - Jin-Sheng Yu
- Shanghai Engineering Research Center of Molecular Therapeutics and New Drug Development, Shanghai Key Laboratory of Green Chemistry and Chemical Processes, School of Chemistry and Molecular Engineering, East China Normal University 3663N Zhongshan Road Shanghai 200062 China.,Key Laboratory of Tropical Medicinal Resource Chemistry of Ministry of Education, Hainan Normal University Haikou 571158 China
| | - Jian Zhou
- Shanghai Engineering Research Center of Molecular Therapeutics and New Drug Development, Shanghai Key Laboratory of Green Chemistry and Chemical Processes, School of Chemistry and Molecular Engineering, East China Normal University 3663N Zhongshan Road Shanghai 200062 China.,State Key Laboratory of Organometallic Chemistry, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences Shanghai 200032 China
| |
Collapse
|
26
|
Li J, Chen Y, Zhong R, Zhang Y, Yang J, Ding H, Wang Z. [3,3]-Sigmatropic Rearrangement/Haller–Bauer Reaction of Aryl Sulfoxides and Selenoxides with Difluoroenoxysilanes: Access to CF2H-Containing Chalcogenides. Org Lett 2020; 22:1164-1168. [DOI: 10.1021/acs.orglett.0c00018] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Jinshan Li
- Advanced Research Institute and Department of Chemistry, Taizhou University, 1139 Shifu Avenue, Taizhou 318000, P. R. China
| | - Yixin Chen
- Advanced Research Institute and Department of Chemistry, Taizhou University, 1139 Shifu Avenue, Taizhou 318000, P. R. China
| | - Rong Zhong
- Advanced Research Institute and Department of Chemistry, Taizhou University, 1139 Shifu Avenue, Taizhou 318000, P. R. China
| | - Yonggang Zhang
- Advanced Research Institute and Department of Chemistry, Taizhou University, 1139 Shifu Avenue, Taizhou 318000, P. R. China
| | - Jianguo Yang
- Advanced Research Institute and Department of Chemistry, Taizhou University, 1139 Shifu Avenue, Taizhou 318000, P. R. China
| | - Hanfeng Ding
- Department of Chemistry, Zhejiang University, Hangzhou 310058, P. R. China
| | - Zhiming Wang
- Advanced Research Institute and Department of Chemistry, Taizhou University, 1139 Shifu Avenue, Taizhou 318000, P. R. China
| |
Collapse
|
27
|
Li C, Zhao Y, Zhou J, Wang X, Hou J, Song Y, Liu W, Han G. Synthesis of difluoroalkylated 2-azaspiro[4.5]decane derivatives via copper-catalyzed difluoroalkylation/dearomatization of N-benzylacrylamides. Org Biomol Chem 2020; 18:8376-8380. [DOI: 10.1039/d0ob01833c] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
A copper-catalyzed synthesis of difluoroalkylated spiro-azacycles from N-benzylacrylamides is presented. The reaction involves the β-difluoroalkylation of acrylamide, 5-exo cyclization, and dearomatization.
Collapse
Affiliation(s)
- Chengwen Li
- Tianjin Key Laboratory on Technologies Enabling Development of Clinical Therapeutics and Diagnostics
- School of Pharmacy
- Tianjin Medical University
- Tianjin 300070
- P. R. China
| | - Yilin Zhao
- Tianjin Key Laboratory on Technologies Enabling Development of Clinical Therapeutics and Diagnostics
- School of Pharmacy
- Tianjin Medical University
- Tianjin 300070
- P. R. China
| | - Jiaxin Zhou
- Tianjin Key Laboratory on Technologies Enabling Development of Clinical Therapeutics and Diagnostics
- School of Pharmacy
- Tianjin Medical University
- Tianjin 300070
- P. R. China
| | - Xue Wang
- Tianjin Key Laboratory on Technologies Enabling Development of Clinical Therapeutics and Diagnostics
- School of Pharmacy
- Tianjin Medical University
- Tianjin 300070
- P. R. China
| | - Jingli Hou
- Tianjin Key Laboratory on Technologies Enabling Development of Clinical Therapeutics and Diagnostics
- School of Pharmacy
- Tianjin Medical University
- Tianjin 300070
- P. R. China
| | - Yuguang Song
- Tianjin Key Laboratory on Technologies Enabling Development of Clinical Therapeutics and Diagnostics
- School of Pharmacy
- Tianjin Medical University
- Tianjin 300070
- P. R. China
| | - Wenjuan Liu
- Jiangsu Duxingzhiyuan New Material Technology Co. Ltd
- Nantong
- 226300
- P. R. China
| | - Guifang Han
- Tianjin Key Laboratory on Technologies Enabling Development of Clinical Therapeutics and Diagnostics
- School of Pharmacy
- Tianjin Medical University
- Tianjin 300070
- P. R. China
| |
Collapse
|
28
|
Gao X, Cheng R, Xiao YL, Wan XL, Zhang X. Copper-Catalyzed Highly Enantioselective Difluoroalkylation of Secondary Propargyl Sulfonates with Difluoroenoxysilanes. Chem 2019. [DOI: 10.1016/j.chempr.2019.09.012] [Citation(s) in RCA: 38] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
|
29
|
Masuhara Y, Tanaka T, Takenaka H, Hayase S, Nokami T, Itoh T. Synthesis of gem-Difluoromethylene Containing Cycloalkenes via the Ring-Opening Reaction of gem-Difluorocyclopropanes and Subsequent RCM Reaction. J Org Chem 2019; 84:5440-5449. [PMID: 30929443 DOI: 10.1021/acs.joc.9b00415] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
The radical-type ring-opening reaction of gem-difluorocyclopropanes and subsequent regioselective monoepoxidation of the products were demonstrated. Introduction of a vinyl or allyl group to the epoxide produced the diene derivatives that were subjected to the ring closing metathesis reaction to furnish the gem-difluoromethylene containing cyclopentene, cycloheptene, and cyclooctene derivatives in good to excellent yields.
Collapse
|
30
|
Internally reuse by-product as promoter: A catalyst-free imine formation/Mukaiyama-Mannich sequence of α-amido sulfones with fluorinated silyl enol ethers. J Fluor Chem 2019. [DOI: 10.1016/j.jfluchem.2019.01.003] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
|
31
|
Huang Y, Lin Z, Chen Y, Fang S, Jiang H, Wu W. Transition-metal-free N-difluoromethylation of hydrazones with TMSCF2Br as the difluoromethylation reagent. Org Chem Front 2019. [DOI: 10.1039/c9qo00506d] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
A transition-metal-free N-difluoromethylation protocol is developed to synthesize a series of N-difluoromethyl hydrazones with TMSCF2Br as the difluoromethylation reagent.
Collapse
Affiliation(s)
- Yubing Huang
- Key Laboratory of Functional Molecular Engineering of Guangdong Province
- School of Chemistry and Chemical Engineering
- South China University of Technology
- Guangzhou
- People's Republic of China
| | - Zhiming Lin
- Key Laboratory of Functional Molecular Engineering of Guangdong Province
- School of Chemistry and Chemical Engineering
- South China University of Technology
- Guangzhou
- People's Republic of China
| | - Yang Chen
- Key Laboratory of Functional Molecular Engineering of Guangdong Province
- School of Chemistry and Chemical Engineering
- South China University of Technology
- Guangzhou
- People's Republic of China
| | - Songjia Fang
- Key Laboratory of Functional Molecular Engineering of Guangdong Province
- School of Chemistry and Chemical Engineering
- South China University of Technology
- Guangzhou
- People's Republic of China
| | - Huanfeng Jiang
- Key Laboratory of Functional Molecular Engineering of Guangdong Province
- School of Chemistry and Chemical Engineering
- South China University of Technology
- Guangzhou
- People's Republic of China
| | - Wanqing Wu
- Key Laboratory of Functional Molecular Engineering of Guangdong Province
- School of Chemistry and Chemical Engineering
- South China University of Technology
- Guangzhou
- People's Republic of China
| |
Collapse
|
32
|
Hu XS, Ding PG, Yu JS, Zhou J. A Sc(OTf)3 catalyzed Mukaiyama–Mannich reaction of difluoroenoxysilanes with unactivated ketimines. Org Chem Front 2019. [DOI: 10.1039/c9qo00577c] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
The first example of a Mukaiyama–Mannich reaction of difluoroenoxysilanes with unactivated ketimines catalyzed by Sc(OTf)3 is described.
Collapse
Affiliation(s)
- Xiao-Si Hu
- Shanghai Engineering Research Center of Molecular Therapeutics and New Drug Development
- Shanghai Key Laboratory of Green Chemistry and Chemical Processes
- East China Normal University
- Shanghai 200062
- China
| | - Pei-Gang Ding
- Shanghai Engineering Research Center of Molecular Therapeutics and New Drug Development
- Shanghai Key Laboratory of Green Chemistry and Chemical Processes
- East China Normal University
- Shanghai 200062
- China
| | - Jin-Sheng Yu
- Shanghai Engineering Research Center of Molecular Therapeutics and New Drug Development
- Shanghai Key Laboratory of Green Chemistry and Chemical Processes
- East China Normal University
- Shanghai 200062
- China
| | - Jian Zhou
- Shanghai Engineering Research Center of Molecular Therapeutics and New Drug Development
- Shanghai Key Laboratory of Green Chemistry and Chemical Processes
- East China Normal University
- Shanghai 200062
- China
| |
Collapse
|
33
|
Rabasa-Alcañiz F, Hammerl D, Sánchez-Merino A, Tejero T, Merino P, Fustero S, del Pozo C. Asymmetric synthesis of polycyclic 3-fluoroalkylproline derivatives by intramolecular azomethine ylide cycloaddition. Org Chem Front 2019. [DOI: 10.1039/c9qo00525k] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The asymmetric intramolecular dipolar cycloaddition of azomethine ylides was developed for fluorinated dipolarophiles, being the RF group crucial for selectivity.
Collapse
Affiliation(s)
| | - Daniel Hammerl
- Departamento de Química Orgánica
- Universidad de Valencia
- E-46100 Burjassot
- Spain
| | | | - Tomás Tejero
- Instituto de Síntesis Química y Catálisis Homogénea (ISQCH)
- Universidad de Zaragoza
- 50009 Zaragoza
- Spain
| | - Pedro Merino
- Instituto de Biocomputación y Fisica de Sistemas Complejos (BIFI)
- Universidad de Zaragoza
- 50009 Zaragoza
- Spain
| | - Santos Fustero
- Departamento de Química Orgánica
- Universidad de Valencia
- E-46100 Burjassot
- Spain
- Laboratorio de Moléculas Orgánicas
| | - Carlos del Pozo
- Departamento de Química Orgánica
- Universidad de Valencia
- E-46100 Burjassot
- Spain
| |
Collapse
|
34
|
Hu XS, Yu JS, Zhou J. Catalytic selective mono- and difluoroalkylation using fluorinated silyl enol ethers. Chem Commun (Camb) 2019; 55:13638-13648. [DOI: 10.1039/c9cc07677h] [Citation(s) in RCA: 53] [Impact Index Per Article: 10.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
This feature article highlights our recent achievements in catalytic selective mono- and difluoroalkylation using fluorinated silyl enol ethers (FSEEs).
Collapse
Affiliation(s)
- Xiao-Si Hu
- Shanghai Engineering Research Center of Molecular Therapeutics and New Drug Development
- East China Normal University
- Shanghai 200062
- P. R. China
| | - Jin-Sheng Yu
- Shanghai Engineering Research Center of Molecular Therapeutics and New Drug Development
- East China Normal University
- Shanghai 200062
- P. R. China
| | - Jian Zhou
- Shanghai Engineering Research Center of Molecular Therapeutics and New Drug Development
- East China Normal University
- Shanghai 200062
- P. R. China
- Shanghai Key Laboratory of Green Chemistry and Chemical Processes
| |
Collapse
|
35
|
Liang H, Xu GQ, Feng ZT, Wang ZY, Xu PF. Dual Catalytic Switchable Divergent Synthesis: An Asymmetric Visible-Light Photocatalytic Approach to Fluorine-Containing γ-Keto Acid Frameworks. J Org Chem 2018; 84:60-72. [PMID: 30507130 DOI: 10.1021/acs.joc.8b02316] [Citation(s) in RCA: 30] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Herein, we describe a novel and efficient method for constructing a series of fluorine-containing γ-keto acid derivatives through combining visible-light photoredox catalysis and chiral Lewis acid catalysis. With this dual catalytic strategy, a variety of chiral γ-keto amides containing a gem-difluoroalkyl group and a series of fluorine-containing α,β-unsaturated-γ-keto esters were successfully constructed with high stereoselectivities, respectively. A series of experiments showed that the chemoselectivity of this process was highly dependent on the fluorine reagents besides the Lewis acid catalysts. This approach facilitates rapid access to γ-keto acid derivatives, an important class of precursors for pharmaceuticals, plasticizers, and various other additives.
Collapse
Affiliation(s)
- Hui Liang
- State Key Laboratory of Applied Organic Chemistry, College of Chemistry and Chemical Engineering , Lanzhou University , Lanzhou 730000 , P. R. China
| | - Guo-Qiang Xu
- State Key Laboratory of Applied Organic Chemistry, College of Chemistry and Chemical Engineering , Lanzhou University , Lanzhou 730000 , P. R. China
| | - Zhi-Tao Feng
- State Key Laboratory of Applied Organic Chemistry, College of Chemistry and Chemical Engineering , Lanzhou University , Lanzhou 730000 , P. R. China
| | - Zhu-Yin Wang
- State Key Laboratory of Applied Organic Chemistry, College of Chemistry and Chemical Engineering , Lanzhou University , Lanzhou 730000 , P. R. China
| | - Peng-Fei Xu
- State Key Laboratory of Applied Organic Chemistry, College of Chemistry and Chemical Engineering , Lanzhou University , Lanzhou 730000 , P. R. China
| |
Collapse
|
36
|
Hao YJ, Hu XS, Yu JS, Zhou F, Zhou Y, Zhou J. An efficient Fe(III)-catalyzed 1,6-conjugate addition of para-quinone methides with fluorinated silyl enol ethers toward β,β-diaryl α-fluorinated ketones. Tetrahedron 2018. [DOI: 10.1016/j.tet.2018.11.017] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
|
37
|
Wu M, Zhao X, Liu Y, Cao S. Synthesis of difluoromethylated enynes by the reaction of α-(trifluoromethyl)styrenes with terminal alkynes. Org Biomol Chem 2018; 16:6909-6917. [PMID: 30225511 DOI: 10.1039/c8ob02117a] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
A novel and efficient method for the synthesis of difluoromethylated enynes by the reaction of α-(trifluoromethyl)styrenes with terminal alkynes with the assistance of NaOtBu was described. The mechanism of the reaction might involve the SN2' reaction of α-(trifluoromethyl)styrenes and a subsequent 1,3-H shift. Isomerization (E → Z) of 1-difluoromethyl-1,3-enynes in the presence of ZrCl4 was also developed.
Collapse
Affiliation(s)
- Mingsheng Wu
- Shanghai Key Laboratory of Chemical Biology, School of Pharmacy, East China University of Science and Technology (ECUST), Shanghai 200237, China.
| | | | | | | |
Collapse
|
38
|
Reddy MK, Ramakrishna I, Baidya M. Divergent Reactivity of gem-Difluoro-enolates toward Nitrogen Electrophiles: Unorthodox Nitroso Aldol Reaction for Rapid Synthesis of α-Ketoamides. Org Lett 2018; 20:4610-4613. [PMID: 30033729 DOI: 10.1021/acs.orglett.8b01900] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
An amination reaction of in situ generated gem-difluoro-enolates has been explored with electrophilic nitrogen sources. While their exposure to azodicarboxylates smoothly produced fluorinated α-amino ketones, reaction with nitrosoarenes (nitroso aldol reaction) furnished α-ketoamides in very high yields (up to 94%). The reaction is very fast (typically completed within 5 min) and scalable and tolerates various sensitive functional groups. Synthetic utility of this process was highlighted through the production of diverse nitrogen heterocycles and an orexin receptor antagonist.
Collapse
Affiliation(s)
- Mallu Kesava Reddy
- Department of Chemistry , Indian Institute of Technology Madras , Chennai 600 036 , Tamil Nadu , India
| | - Isai Ramakrishna
- Department of Chemistry , Indian Institute of Technology Madras , Chennai 600 036 , Tamil Nadu , India
| | - Mahiuddin Baidya
- Department of Chemistry , Indian Institute of Technology Madras , Chennai 600 036 , Tamil Nadu , India
| |
Collapse
|
39
|
Cao ZY, Zhou F, Zhou J. Development of Synthetic Methodologies via Catalytic Enantioselective Synthesis of 3,3-Disubstituted Oxindoles. Acc Chem Res 2018; 51:1443-1454. [PMID: 29808678 DOI: 10.1021/acs.accounts.8b00097] [Citation(s) in RCA: 285] [Impact Index Per Article: 47.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
3,3-Disubstituted oxindoles are widely distributed in natural products, drugs, and pharmaceutically active compounds. The absolute configuration and the substituents on the fully substituted C3 stereocenter of the oxindole often significantly influence the biological activity. Therefore, tremendous efforts have made to develop catalytic enantioselective syntheses of this prominent structural motif. Research in this area is further fueled by the ever-increasing demand for modern probe- and drug-discovery programs for synthetic libraries of chiral compounds that are derived from privileged scaffolds with high structural diversity. Notably, the efficient construction of fully substituted C3 stereocenters of oxindole, tetrasubstituted or all-carbon quaternary, spirocyclic or not, also becomes a test ground for new synthetic methodologies. We have been engaged in developing efficient methods for diversity-oriented synthesis of chiral 3,3-disubstituted oxindoles from readily available starting materials. We have systematically developed catalytic enantioselective methods to prepare 3-substituted 3-hydroxyoxindoles, 3-aminooxindoles, and 3-thiooxindoles, quaternary oxindoles, and spirocyclic oxindoles. These protocols can be classified into six approaches: (1) enantioselective addition of nucleophiles to isatins or isatin ketimines; (2) unprotected 3-substituted oxindoles as nucleophiles; (3) functionalization of oxindole-derived tetrasubstituted alkenes; (4) desymmetrization of oxindole-based diynes; (5) spirocyclopropyl oxindoles as donor-acceptor (D-A) cyclopropanes; and (6) elaboration of diazooxindoles. By the use of these methods, chiral oxindoles with rich structural diversity are readily accessed with high to excellent enantioselectivity. Some methods have been used for the enantioselective formal or total synthesis of natural products, bioactive compounds, or their analogues. On the basis of these studies, we developed synthetic methodologies that have potential application. We designed phosphoramide-based bifunctional catalysts for the efficient construction of quaternary oxindoles: a cinchona-alkaloid-derived phosphoramide for the Michael addition of unprotected 3-substituted oxindoles to nitroolefins with broad substrate scope and a chiral 1,2-cyclohexanediamine-derived bifunctional phosphoramide for the activation of fluorinated enol silyl ethers for the addition to isatylidene malononitrile. The phosphoramide-based catalysts achieved better enantiofacial control than the analogous H-bond-donor-derived catalysts in these reactions, suggesting the potential of the former in new chiral catalyst development. We identified chiral Au(I) and Hg(II) catalysts for olefin cyclopropanation of diazooxindoles. We further disclosed the effective activation of spirocyclopropyl oxindoles by using electron-withdrawing N-protecting groups for enantioselective [3 + 3] cycloaddition, offering the promise of constructing a diverse range of spirocyclic oxindoles by the use of such monoactivated D-A cyclopropanes. We developed tandem sequences that allow the facile synthesis of 3,3-disubstituted oxindoles from simple starting materials in a one-pot operation, including a tandem Morita-Baylis-Hillman/bromination/[3 + 2] annulation sequence, a hydrogenation/ketimine formation/asymmetric 6π electrocyclization sequence, a C-H functionalization/Michael addition or amination sequence, and an aza-Wittig/Strecker sequence. We designed oxindole-based diynes to realize a highly enantioselective Cu-catalyzed alkyne-azide cycloaddition (CuAAC), outlining the desymmetrization of prochiral diynes as an effective strategy to exploit asymmetric CuAAC. This Account focuses on the synthetic methodologies developed in our group for the catalytic enantioselective synthesis of 3,3-disubstituted oxindoles and provides an overview of our research on the design, development, and applications of these methods that will provide useful insights for the exploration of new reactions.
Collapse
Affiliation(s)
| | | | - Jian Zhou
- State Key Laboratory of Organometallic Chemistry, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, Shanghai 200032, P. R. China
| |
Collapse
|
40
|
Yan SY, Zhang ZZ, Liu YH, Liao G, Li PX, Shi BF. Copper-Catalyzed C−H Ethoxycarbonyldifluoromethylation of Indoles and Pyrroles. ASIAN J ORG CHEM 2018. [DOI: 10.1002/ajoc.201800166] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Affiliation(s)
- Sheng-Yi Yan
- Department of Chemistry; Zhejiang University; Hangzhou 310027 People's Republic of China
| | - Zhuo-Zhuo Zhang
- Department of Chemistry; Zhejiang University; Hangzhou 310027 People's Republic of China
| | - Yan-Hua Liu
- Department of Chemistry; Zhejiang University; Hangzhou 310027 People's Republic of China
| | - Gang Liao
- Department of Chemistry; Zhejiang University; Hangzhou 310027 People's Republic of China
| | - Peng-Xiang Li
- School of Chemical & Environmental Engineering; Wuyi University; Jiangmen 529020 People's Republic of China
| | - Bing-Feng Shi
- Department of Chemistry; Zhejiang University; Hangzhou 310027 People's Republic of China
| |
Collapse
|
41
|
Liu YL, Yin XP, Zhou J. Internally Reuse Waste: Catalytic Asymmetric One-Pot Strecker Reaction of Fluoroalkyl Ketones, Anilines and TMSCN by Sequential Catalysis. CHINESE J CHEM 2018. [DOI: 10.1002/cjoc.201800001] [Citation(s) in RCA: 33] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Affiliation(s)
- Yun-Lin Liu
- Shanghai Key Laboratory of Green Chemistry and Chemical Processes, School of Chemistry and Molecular Engineering; East China Normal University; Shanghai 200062 China
| | - Xiao-Ping Yin
- Shanghai Key Laboratory of Green Chemistry and Chemical Processes, School of Chemistry and Molecular Engineering; East China Normal University; Shanghai 200062 China
| | - Jian Zhou
- Shanghai Key Laboratory of Green Chemistry and Chemical Processes, School of Chemistry and Molecular Engineering; East China Normal University; Shanghai 200062 China
- Shanghai Engineering Research Center of Molecular Therapeutics and New Drug Development; East China Normal University; Shanghai 200062 China
| |
Collapse
|
42
|
Cao ZY, Wang W, Liao K, Wang X, Zhou J, Ma J. Catalytic enantioselective synthesis of cyclopropanes featuring vicinal all-carbon quaternary stereocenters with a CH2F group; study of the influence of C–F⋯H–N interactions on reactivity. Org Chem Front 2018. [DOI: 10.1039/c8qo00842f] [Citation(s) in RCA: 26] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
A highly diastereo- and enantioselective synthesis of cyclopropanes with adjacent all-carbon quaternary stereocenters featuring a CH2F group is reported.
Collapse
Affiliation(s)
- Zhong-Yan Cao
- Shanghai Key Laboratory of Green Chemistry and Chemical Process
- East China Normal University
- Shanghai 200062
- P. R. China
| | - Wenmin Wang
- Institute of Theoretical and Computational Chemistry
- School of Chemistry and Chemical Engineering
- Nanjing University
- Nanjing 210023
- P R China
| | - Kui Liao
- Shanghai Key Laboratory of Green Chemistry and Chemical Process
- East China Normal University
- Shanghai 200062
- P. R. China
| | - Xiaoming Wang
- State Key Laboratory of Organometallic Chemistry
- Shanghai Institute of Organic Chemistry
- Chinese Academy of Sciences
- Shanghai 200032
- P R China
| | - Jian Zhou
- Shanghai Key Laboratory of Green Chemistry and Chemical Process
- East China Normal University
- Shanghai 200062
- P. R. China
- State Key Laboratory of Organometallic Chemistry
| | - Jing Ma
- Institute of Theoretical and Computational Chemistry
- School of Chemistry and Chemical Engineering
- Nanjing University
- Nanjing 210023
- P R China
| |
Collapse
|
43
|
Yang X, Zhang F, Zhou Y, Huang YY. Neighboring phenolic group-activated gem-difluoroallylboration of imines for the catalyst-free synthesis of gem-difluorohomoallylamines. Org Biomol Chem 2018; 16:3367-3371. [DOI: 10.1039/c8ob00541a] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
An unprecedented imine allylation with pinacol gem-difluoroallylborates for the synthesis of a wide range of racemic gem-difluorohomoallylamine derivatives under catalyst-free conditions was enabled by a neighboring phenolic group in an N-protecting group.
Collapse
Affiliation(s)
- Xing Yang
- Department of Chemistry
- School of Chemistry
- Chemical Engineering and Life Science
- Wuhan University of Technology
- Wuhan 430070
| | - Feng Zhang
- College of Science
- Hunan Agricultural University
- Changsha 410128
- P. R. China
| | - Yang Zhou
- Department of Chemistry
- School of Chemistry
- Chemical Engineering and Life Science
- Wuhan University of Technology
- Wuhan 430070
| | - Yi-Yong Huang
- Department of Chemistry
- School of Chemistry
- Chemical Engineering and Life Science
- Wuhan University of Technology
- Wuhan 430070
| |
Collapse
|
44
|
Yu X, Bai H, Wang D, Qin Z, Li JQ, Fu B. A convenient approach to difluoromethylated all-carbon quaternary centers via Ni(ii)-catalyzed enantioselective Michael addition. RSC Adv 2018; 8:19402-19408. [PMID: 35541018 PMCID: PMC9080679 DOI: 10.1039/c8ra02853b] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2018] [Accepted: 05/09/2018] [Indexed: 11/21/2022] Open
Abstract
A Ni(ii)-catalyzed enantioselective Michael addition of 2-acetyl azarenes with β-difluoromethyl substituted nitroalkenes was successfully realized, which afforded chiral CF2H-containing compounds in good enantioselectivities (up to 93% ee). This protocol provides a new convenient approach to all-carbon quaternary stereogenic centers featuring a CF2H group. Ni(ii)-catalyzed enantioselective Michael addition afforded compounds with all-carbon quaternary stereogenic centers featuring a CF2H group in good enantioselectivities.![]()
Collapse
Affiliation(s)
- Xuan Yu
- Department of Applied Chemistry
- China Agricultural University
- Beijing 100193
- People's Republic of China
| | - Hui Bai
- Department of Applied Chemistry
- China Agricultural University
- Beijing 100193
- People's Republic of China
| | - Dong Wang
- Department of Applied Chemistry
- China Agricultural University
- Beijing 100193
- People's Republic of China
| | - Zhaohai Qin
- Department of Applied Chemistry
- China Agricultural University
- Beijing 100193
- People's Republic of China
| | - Jia-Qi Li
- Department of Applied Chemistry
- China Agricultural University
- Beijing 100193
- People's Republic of China
| | - Bin Fu
- Department of Applied Chemistry
- China Agricultural University
- Beijing 100193
- People's Republic of China
| |
Collapse
|
45
|
A general and efficient Lewis acid catalysed Mukaiyama-aldol reaction of difluoroenoxysilanes and ketones. Sci Bull (Beijing) 2017; 62:1504-1509. [PMID: 36659427 DOI: 10.1016/j.scib.2017.10.016] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2017] [Revised: 09/30/2017] [Accepted: 10/09/2017] [Indexed: 01/21/2023]
Abstract
We report a general and highly efficient Mukaiyama-aldol reaction of ketones and difluoroenoxysilanes. While the reaction of aryl ketones worked efficiently in the presence of Bi(OTf)3, that of aliphatic ketones required the use of Sc(OTf)3. In addition, Sc(OTf)3 was capable of achieving excellent 1,2-selectivity in the corresponding reaction of α,β-unsaturated ketones. This method provides a facile access to differently substituted β-hydroxy α,α-difluoro ketones, versatile synthons for difluomethylated tertiary alcohols.
Collapse
|
46
|
Kong J, Jiang J, Huang Y, Lou YG, Li XF, He CY. Ru(bpy)3
Cl2
as a Photocatalyst for Visible-Light-Induced Fluoroalkylation of Anilines with BrCF2
CF2
Br: A Facile Route to 2-Bromo-1,1,2,2-tetrafluoroethyl Arenes. ASIAN J ORG CHEM 2017. [DOI: 10.1002/ajoc.201700422] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Jingjing Kong
- Department: Generic Drug Research Center of Guizhou Province, School of Pharmacy; Zunyi Medical University; No. 6 West Xuefu Road Zunyi Guizhou 563003 China
| | - Jianfang Jiang
- Department: Generic Drug Research Center of Guizhou Province, School of Pharmacy; Zunyi Medical University; No. 6 West Xuefu Road Zunyi Guizhou 563003 China
| | - Yang Huang
- Department: Generic Drug Research Center of Guizhou Province, School of Pharmacy; Zunyi Medical University; No. 6 West Xuefu Road Zunyi Guizhou 563003 China
| | - Yue-Guang Lou
- Department: Generic Drug Research Center of Guizhou Province, School of Pharmacy; Zunyi Medical University; No. 6 West Xuefu Road Zunyi Guizhou 563003 China
| | - Xiao-Fei Li
- Department: Generic Drug Research Center of Guizhou Province, School of Pharmacy; Zunyi Medical University; No. 6 West Xuefu Road Zunyi Guizhou 563003 China
| | - Chun-Yang He
- Department: Generic Drug Research Center of Guizhou Province, School of Pharmacy; Zunyi Medical University; No. 6 West Xuefu Road Zunyi Guizhou 563003 China
| |
Collapse
|
47
|
Ji X, Zhao X, Shi H, Cao S. HMPA-Promoted Siladifluoromethylation of Di-, and Triarylmethanes with the Ruppert-Prakash Reagent. Chem Asian J 2017; 12:2794-2798. [PMID: 28940982 DOI: 10.1002/asia.201701224] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2017] [Revised: 09/17/2017] [Indexed: 11/11/2022]
Affiliation(s)
- Xinfei Ji
- Shanghai Key Laboratory of Chemical Biology, School of Pharmacy; East China University of Science and Technology (ECUST); Shanghai 200237 P.R. China
| | - Xianghu Zhao
- Shanghai Key Laboratory of Chemical Biology, School of Pharmacy; East China University of Science and Technology (ECUST); Shanghai 200237 P.R. China
| | - Hongyan Shi
- Shanghai Key Laboratory of Chemical Biology, School of Pharmacy; East China University of Science and Technology (ECUST); Shanghai 200237 P.R. China
| | - Song Cao
- Shanghai Key Laboratory of Chemical Biology, School of Pharmacy; East China University of Science and Technology (ECUST); Shanghai 200237 P.R. China
- Key Laboratory of Organofluorine Chemistry, Shanghai Institute of Organic Chemistry; Chinese Academy of Sciences; Shanghai 200032 P.R. China
| |
Collapse
|
48
|
Wang Y, Xing F, Gu CZ, Li WJ, He L, Dai B, Du GF. N-heterocyclic carbene-catalyzed fluorinated silyl-Reformatsky reaction of aldehydes with difluoro (trimethylsilyl) acetate. Tetrahedron 2017. [DOI: 10.1016/j.tet.2017.06.027] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
|
49
|
Wu YB, Wan L, Lu GP, Cai C. “All-Water” Synthesis of β-Amino α,α-Difluoro Ketones from Fluorinated Enol Silyl Ethers and Imines. European J Org Chem 2017. [DOI: 10.1002/ejoc.201700591] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Ye-bin Wu
- Chemical Engineering College; Nanjing University of Science and Technology; 200 Xiao Ling Wei Street Nanjing Jiangsu People's Republic of China
| | - Li Wan
- Biotechnology and Pharmaceutical Engineering College; Nanjing Tech University; 211816 Nanjing People's Republic of China
| | - Guo-ping Lu
- Chemical Engineering College; Nanjing University of Science and Technology; 200 Xiao Ling Wei Street Nanjing Jiangsu People's Republic of China
| | - Chun Cai
- Chemical Engineering College; Nanjing University of Science and Technology; 200 Xiao Ling Wei Street Nanjing Jiangsu People's Republic of China
- Key Laboratory of Organofluorine Chemistry; Shanghai Institute of Organic Chemistry; Chinese Academy of Sciences; 345 Lingling Lu 20032 Shanghai People's Republic of China
| |
Collapse
|
50
|
Zhu SQ, Xu XH, Qing FL. Silver-mediated oxidative C–H difluoromethylation of phenanthridines and 1,10-phenanthrolines. Chem Commun (Camb) 2017; 53:11484-11487. [DOI: 10.1039/c7cc05411d] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
An efficient silver-mediated oxidative C–H difluoromethylation of phenanthridines and 1,10-phenanthrolines with TMSCF2H was developed.
Collapse
Affiliation(s)
- Sheng-Qing Zhu
- Key Laboratory of Organofluorine Chemistry
- Shanghai Institute of Organic Chemistry
- Chinese Academy of Science
- Shanghai 200032
- China
| | - Xiu-Hua Xu
- Key Laboratory of Organofluorine Chemistry
- Shanghai Institute of Organic Chemistry
- Chinese Academy of Science
- Shanghai 200032
- China
| | - Feng-Ling Qing
- Key Laboratory of Organofluorine Chemistry
- Shanghai Institute of Organic Chemistry
- Chinese Academy of Science
- Shanghai 200032
- China
| |
Collapse
|