1
|
Li B, Xie F, Zhang R, Wang Y, Gondi VB, Hale CRH. Synthesis of Diverse N-Trifluoromethyl Pyrazoles by Trapping of Transiently-Generated Trifluoromethylhydrazine. J Org Chem 2024; 89:13959-13969. [PMID: 39298329 DOI: 10.1021/acs.joc.4c01118] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 09/21/2024]
Abstract
A one-pot synthesis of functionalized N-trifluoromethyl pyrazoles from readily available di-Boc trifluoromethylhydrazine and dialdehydes, diketones, carbonylnitriles, and ketoesters/amides/acids is described. 19F NMR studies were used to characterize the stability of trifluoromethylhydrazine HCl salt in solution and in solid form and identified a short solution-state half-life of ∼6 h. Optimization of cyclization conditions identified DCM, combined with a strong acid, as a key to suppress the undesired des-CF3 side products, which formed as a result of the instability of trifluoromethylhydrazine and related intermediates. Despite the short-lived nature of these transient intermediates, their reactivity could be utilized to directly deliver a diverse array of pharmaceutically relevant N-trifluoromethyl pyrazoles in synthetically useful yields.
Collapse
Affiliation(s)
- Bao Li
- WuXi AppTec Research Chemical Service, 168 NanHai Road, 10th Avenue, TEDA, Tianjin 300457, China
| | - Fenglei Xie
- WuXi AppTec Research Chemical Service, 168 NanHai Road, 10th Avenue, TEDA, Tianjin 300457, China
| | - Rui Zhang
- WuXi AppTec Research Chemical Service, 168 NanHai Road, 10th Avenue, TEDA, Tianjin 300457, China
| | - Yaoyi Wang
- WuXi AppTec Research Chemical Service, 168 NanHai Road, 10th Avenue, TEDA, Tianjin 300457, China
| | - Vijaya B Gondi
- Chemical Development, Karuna Therapeutics─A Bristol Myers Squibb Company, 99 High Street, Floor 26, Boston, Massachusetts 02110, United States
| | - Christopher R H Hale
- Chemical Development, Karuna Therapeutics─A Bristol Myers Squibb Company, 99 High Street, Floor 26, Boston, Massachusetts 02110, United States
| |
Collapse
|
2
|
An Y, Tang XB, Sun DW, Meng TT, Zhao B, Han S, Yang ZQ, Zhang W, Tang N, Zeng JJ, Lu J. Stereoselective synthetic approach toward β-trifluoromethyl vinyl ethers and diethers via reaction of ( E)-1,2-dichloro-3,3,3-trifluoroprop-1-ene with phenols. Org Biomol Chem 2024. [PMID: 39318223 DOI: 10.1039/d4ob01254b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 09/26/2024]
Abstract
A convenient method for synthesizing β-trifluoromethyl vinyl ethers and diethers through the base-mediated C-O coupling of (E)-1,2-dichloro-3,3,3-trifluoroprop-1-ene and phenols has been developed. Remarkably, the present process shows perfect regioselective and stereoselective yield of the Z/E isomers for β-trifluoromethyl vinyl ethers with high efficiency. Additionally, β-trifluoromethyl vinyl diethers with identical/diverse phenoxy groups were also obtained and the regulation of the product configuration was achieved. These reactions feature transition-metal-free conditions, wide substrate scope, and atom economy.
Collapse
Affiliation(s)
- Yu An
- State Key Laboratory of Fluorine & Nitrogen Chemicals, Xi'an Modern Chemistry Research Institute, 168 Zhangbadong Road, Xi'an City, Shannxi Province, 710065, China.
| | - Xiao-Bo Tang
- State Key Laboratory of Fluorine & Nitrogen Chemicals, Xi'an Modern Chemistry Research Institute, 168 Zhangbadong Road, Xi'an City, Shannxi Province, 710065, China.
| | - Dong-Wei Sun
- Electric Power Research Institute of Guangdong Power Grid Co., Ltd, Guangzhou 510080, Guangdong, China
| | - Ting-Ting Meng
- State Key Laboratory of Fluorine & Nitrogen Chemicals, Xi'an Modern Chemistry Research Institute, 168 Zhangbadong Road, Xi'an City, Shannxi Province, 710065, China.
| | - Bo Zhao
- State Key Laboratory of Fluorine & Nitrogen Chemicals, Xi'an Modern Chemistry Research Institute, 168 Zhangbadong Road, Xi'an City, Shannxi Province, 710065, China.
| | - Sheng Han
- State Key Laboratory of Fluorine & Nitrogen Chemicals, Xi'an Modern Chemistry Research Institute, 168 Zhangbadong Road, Xi'an City, Shannxi Province, 710065, China.
| | - Zhi-Qiang Yang
- State Key Laboratory of Fluorine & Nitrogen Chemicals, Xi'an Modern Chemistry Research Institute, 168 Zhangbadong Road, Xi'an City, Shannxi Province, 710065, China.
| | - Wei Zhang
- State Key Laboratory of Fluorine & Nitrogen Chemicals, Xi'an Modern Chemistry Research Institute, 168 Zhangbadong Road, Xi'an City, Shannxi Province, 710065, China.
| | - Nian Tang
- Electric Power Research Institute of Guangdong Power Grid Co., Ltd, Guangzhou 510080, Guangdong, China
| | - Ji-Jun Zeng
- State Key Laboratory of Fluorine & Nitrogen Chemicals, Xi'an Modern Chemistry Research Institute, 168 Zhangbadong Road, Xi'an City, Shannxi Province, 710065, China.
| | - Jian Lu
- State Key Laboratory of Fluorine & Nitrogen Chemicals, Xi'an Modern Chemistry Research Institute, 168 Zhangbadong Road, Xi'an City, Shannxi Province, 710065, China.
| |
Collapse
|
3
|
Spennacchio M, Bernús M, Stanić J, Mazzarella D, Colella M, Douglas JJ, Boutureira O, Noël T. A unified flow strategy for the preparation and use of trifluoromethyl-heteroatom anions. Science 2024; 385:991-996. [PMID: 39208115 DOI: 10.1126/science.adq2954] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2024] [Accepted: 07/16/2024] [Indexed: 09/04/2024]
Abstract
The trifluoromethyl group (CF3) is a key functionality in pharmaceutical and agrochemical development, greatly enhancing the efficacy and properties of resulting compounds. However, attaching the CF3 group to heteroatoms such as sulfur, oxygen, and nitrogen poses challenges because of the lack of general synthetic methods and reliance on bespoke reagents. Here, we present a modular flow platform that streamlines the synthesis of heteroatom-CF3 motifs. Our method uses readily available organic precursors in combination with cesium fluoride as the primary fluorine source, facilitating the rapid generation of N-trifluoromethyl(R) [NCF3(R)], SCF3 (trifluoromethylthio), and OCF3 (trifluoromethoxy) anions on demand without reliance on perfluoroalkyl precursor reagents. This strategy offers a more environmentally friendly synthesis of trifluoromethyl(heteroatom)-containing molecules, with the potential for scalability in manufacturing processes facilitated by flow technology.
Collapse
Affiliation(s)
- Mauro Spennacchio
- Flow Chemistry Group, Van't Hoff Institute for Molecular Sciences (HIMS), University of Amsterdam, Amsterdam, Netherlands
- FLAME-Lab, Flow Chemistry and Microreactor Technology Laboratory, Department of Pharmacy-Drug Sciences, University of Bari "A. Moro," 70125 Bari, Italy
| | - Miguel Bernús
- Flow Chemistry Group, Van't Hoff Institute for Molecular Sciences (HIMS), University of Amsterdam, Amsterdam, Netherlands
- Departament de Química Analítica i Química Orgànica, Universitat Rovira i Virgili, 43007 Tarragona, Spain
| | - Jelena Stanić
- Flow Chemistry Group, Van't Hoff Institute for Molecular Sciences (HIMS), University of Amsterdam, Amsterdam, Netherlands
| | - Daniele Mazzarella
- Flow Chemistry Group, Van't Hoff Institute for Molecular Sciences (HIMS), University of Amsterdam, Amsterdam, Netherlands
- Department of Chemical Sciences, University of Padova, 35131 Padova, Italy
| | - Marco Colella
- Flow Chemistry Group, Van't Hoff Institute for Molecular Sciences (HIMS), University of Amsterdam, Amsterdam, Netherlands
- FLAME-Lab, Flow Chemistry and Microreactor Technology Laboratory, Department of Pharmacy-Drug Sciences, University of Bari "A. Moro," 70125 Bari, Italy
| | - James J Douglas
- Early Chemical Development, Pharmaceutical Sciences R&D, AstraZeneca, Macclesfield, UK
| | - Omar Boutureira
- Departament de Química Analítica i Química Orgànica, Universitat Rovira i Virgili, 43007 Tarragona, Spain
| | - Timothy Noël
- Flow Chemistry Group, Van't Hoff Institute for Molecular Sciences (HIMS), University of Amsterdam, Amsterdam, Netherlands
| |
Collapse
|
4
|
Gao YF, Zhang RZ, Xu C, Wang M. Controllable Regioselective [3+2] Cyclizations of N-CF 3 Imidoyl Chlorides and Ph 3PNNC: Divergent Synthesis of N-CF 3 Triazoles. Org Lett 2024; 26:5087-5091. [PMID: 38864522 DOI: 10.1021/acs.orglett.4c01275] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/13/2024]
Abstract
Presented herein are two distinct regiodivergent [3+2] cyclization reactions between N-CF3 imidoyl chlorides and N-isocyaniminotriphenylphosphorane (NIITP) that include flexible modulation of the electronic properties of NIITP. The regioselectivity of reactions was different in the absence and presence of the Mo catalyst. The approach provides alternative efficient and scalable routes for N-CF3 triazole synthesis, demonstrating a broad substrate scope, excellent functional group tolerance, and practical advantages.
Collapse
Affiliation(s)
- Yan Fang Gao
- Jilin Province Key Laboratory of Organic Functional Molecular Design & Synthesis, College of Chemistry, Northeast Normal University, 5268 Renmin Street, Changchun 130024, China
| | - Ru Zhong Zhang
- Jilin Province Key Laboratory of Organic Functional Molecular Design & Synthesis, College of Chemistry, Northeast Normal University, 5268 Renmin Street, Changchun 130024, China
| | - Cong Xu
- Jilin Province Key Laboratory of Organic Functional Molecular Design & Synthesis, College of Chemistry, Northeast Normal University, 5268 Renmin Street, Changchun 130024, China
| | - Mang Wang
- Jilin Province Key Laboratory of Organic Functional Molecular Design & Synthesis, College of Chemistry, Northeast Normal University, 5268 Renmin Street, Changchun 130024, China
| |
Collapse
|
5
|
Sorlin A, López-Álvarez M, Biboy J, Gray J, Rabbitt SJ, Rahim JU, Lee SH, Bobba KN, Blecha J, Parker MF, Flavell RR, Engel J, Ohliger M, Vollmer W, Wilson DM. Peptidoglycan-Targeted [ 18F]3,3,3-Trifluoro-d-alanine Tracer for Imaging Bacterial Infection. JACS AU 2024; 4:1039-1047. [PMID: 38559735 PMCID: PMC10976610 DOI: 10.1021/jacsau.3c00776] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/06/2023] [Revised: 01/19/2024] [Accepted: 02/06/2024] [Indexed: 04/04/2024]
Abstract
Imaging is increasingly used to detect and monitor bacterial infection. Both anatomic (X-rays, computed tomography, ultrasound, and MRI) and nuclear medicine ([111In]-WBC SPECT, [18F]FDG PET) techniques are used in clinical practice but lack specificity for the causative microorganisms themselves. To meet this challenge, many groups have developed imaging methods that target pathogen-specific metabolism, including PET tracers integrated into the bacterial cell wall. We have previously reported the d-amino acid derived PET radiotracers d-methyl-[11C]-methionine, d-[3-11C]-alanine, and d-[3-11C]-alanine-d-alanine, which showed robust bacterial accumulation in vitro and in vivo. Given the clinical importance of radionuclide half-life, in the current study, we developed [18F]3,3,3-trifluoro-d-alanine (d-[18F]-CF3-ala), a fluorine-18 labeled tracer. We tested the hypothesis that d-[18F]-CF3-ala would be incorporated into bacterial peptidoglycan given its structural similarity to d-alanine itself. NMR analysis showed that the fluorine-19 parent amino acid d-[19F]-CF3-ala was stable in human and mouse serum. d-[19F]-CF3-ala was also a poor substrate for d-amino acid oxidase, the enzyme largely responsible for mammalian d-amino acid metabolism and a likely contributor to background signals using d-amino acid derived PET tracers. In addition, d-[19F]-CF3-ala showed robust incorporation into Escherichia coli peptidoglycan, as detected by HPLC/mass spectrometry. Based on these promising results, we developed a radiosynthesis of d-[18F]-CF3-ala via displacement of a bromo-precursor with [18F]fluoride followed by chiral stationary phase HPLC. Unexpectedly, the accumulation of d-[18F]-CF3-ala by bacteria in vitro was highest for Gram-negative pathogens in particular E. coli. In a murine model of acute bacterial infection, d-[18F]-CF3-ala could distinguish live from heat-killed E. coli, with low background signals. These results indicate the viability of [18F]-modified d-amino acids for infection imaging and indicate that improved specificity for bacterial metabolism can improve tracer performance.
Collapse
Affiliation(s)
- Alexandre
M. Sorlin
- Department
of Radiology, Biomedical Imaging University
of California, San Francisco, San Francisco, California 94158, United States
| | - Marina López-Álvarez
- Department
of Radiology, Biomedical Imaging University
of California, San Francisco, San Francisco, California 94158, United States
| | - Jacob Biboy
- The
Centre for Bacterial Cell Biology, Newcastle
University Newcastle, Newcastle
upon Tyne NE2 4AX, United Kingdom
| | - Joe Gray
- The
Centre for Bacterial Cell Biology, Newcastle
University Newcastle, Newcastle
upon Tyne NE2 4AX, United Kingdom
| | - Sarah J. Rabbitt
- Department
of Radiology, Biomedical Imaging University
of California, San Francisco, San Francisco, California 94158, United States
| | - Junaid Ur Rahim
- Department
of Radiology, Biomedical Imaging University
of California, San Francisco, San Francisco, California 94158, United States
| | - Sang Hee Lee
- Department
of Radiology, Biomedical Imaging University
of California, San Francisco, San Francisco, California 94158, United States
| | - Kondapa Naidu Bobba
- Department
of Radiology, Biomedical Imaging University
of California, San Francisco, San Francisco, California 94158, United States
| | - Joseph Blecha
- Department
of Radiology, Biomedical Imaging University
of California, San Francisco, San Francisco, California 94158, United States
| | - Mathew F.L. Parker
- Department
of Radiology, Biomedical Imaging University
of California, San Francisco, San Francisco, California 94158, United States
- Department
of Psychiatry, Renaissance School of Medicine
at Stony Brook University, Stony Brook, New York 11794, United States
| | - Robert R. Flavell
- Department
of Radiology, Biomedical Imaging University
of California, San Francisco, San Francisco, California 94158, United States
- UCSF
Helen Diller Family Comprehensive Cancer Center, University of California, San Francisco, San Francisco, California 94158, United States
- Department
of Pharmaceutical Chemistry, University
of California, San Francisco, San
Francisco, California 94158, United States
| | - Joanne Engel
- Department
of Medicine, University of California, San
Francisco, San Francisco, California 94158, United States
- Department
of Microbiology and Immunology, University
of California, San Francisco, San
Francisco, California 94158, United States
| | - Michael Ohliger
- Department
of Radiology, Biomedical Imaging University
of California, San Francisco, San Francisco, California 94158, United States
- Department
of Radiology, Zuckerberg San Francisco General
Hospital, San Francisco, California 94110, United States
| | - Waldemar Vollmer
- The
Centre for Bacterial Cell Biology, Newcastle
University Newcastle, Newcastle
upon Tyne NE2 4AX, United Kingdom
- Institute
for Molecular Bioscience, The University
of Queensland, Brisbane 4072, Australia
| | - David M. Wilson
- Department
of Radiology, Biomedical Imaging University
of California, San Francisco, San Francisco, California 94158, United States
| |
Collapse
|
6
|
Fleetwood TD, Kerr WJ, Mason J. Copper-Mediated N-Trifluoromethylation of O-Benzoylhydroxylamines. Chemistry 2024; 30:e202303314. [PMID: 38018464 PMCID: PMC10952365 DOI: 10.1002/chem.202303314] [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: 10/09/2023] [Revised: 11/24/2023] [Accepted: 11/28/2023] [Indexed: 11/30/2023]
Abstract
The use of trifluoromethyl containing compounds is well established within medicinal chemistry, with a range of approved drugs containing C-CF3 and O-CF3 moieties. However, the utilisation of the N-CF3 functional group remains relatively unexplored. This may be attributed to the challenging synthesis of this unit, with many current methods employing harsh conditions or less accessible reagents. A robust methodology for the N-trifluoromethylation of secondary amines has been developed, which employs an umpolung strategy in the form of a copper-catalysed electrophilic amination. The method is operationally simple, uses mild, inexpensive reagents, and has been used to synthesise a range of novel, structurally complex N-CF3 containing compounds.
Collapse
Affiliation(s)
- Thomas D. Fleetwood
- Medicinal ChemistryGSK Medicines Research CentreGunnels Wood RoadSG1 2NYStevenageEnglandU.K.
- Department of Pure and Applied ChemistryUniversity of StrathclydeG1 1XLGlasgowScotlandU.K.
| | - William J. Kerr
- Department of Pure and Applied ChemistryUniversity of StrathclydeG1 1XLGlasgowScotlandU.K.
| | - Joseph Mason
- Medicinal ChemistryGSK Medicines Research CentreGunnels Wood RoadSG1 2NYStevenageEnglandU.K.
| |
Collapse
|
7
|
Zivkovic F, Wycich G, Liu L, Schoenebeck F. Access to N-Difluoromethyl Amides, (Thio)Carbamates, Ureas, and Formamides. J Am Chem Soc 2024; 146:1276-1281. [PMID: 38180777 PMCID: PMC10913043 DOI: 10.1021/jacs.3c13711] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2023] [Revised: 12/30/2023] [Accepted: 01/03/2024] [Indexed: 01/06/2024]
Abstract
The first efficient access to N-difluoromethyl amides, carbamates, thiocarbamates, ureas, formamides, and their derivatives is reported herein. The synthetic strategy relies on the initial synthesis and straightforward derivatization of N-CF2H carbamoyl fluorides, which were prepared through a desulfurization-fluorination of thioformamides (─NH─C(H)═S) coupled with carbonylation. The newly made N-CF2H carbonyl compounds proved to be highly robust and compatible with numerous chemical transformations and downstream derivatizations, underscoring the potential of this novel motif as a building block in complex functional molecules.
Collapse
Affiliation(s)
- Filip
G. Zivkovic
- Institute of Organic Chemistry, RWTH Aachen University, Landoltweg 1, 52074 Aachen, Germany
| | - Gina Wycich
- Institute of Organic Chemistry, RWTH Aachen University, Landoltweg 1, 52074 Aachen, Germany
| | - Linhao Liu
- Institute of Organic Chemistry, RWTH Aachen University, Landoltweg 1, 52074 Aachen, Germany
| | - Franziska Schoenebeck
- Institute of Organic Chemistry, RWTH Aachen University, Landoltweg 1, 52074 Aachen, Germany
| |
Collapse
|
8
|
Baris N, Dračínský M, Tarábek J, Filgas J, Slavíček P, Ludvíková L, Boháčová S, Slanina T, Klepetářová B, Beier P. Photocatalytic Generation of Trifluoromethyl Nitrene for Alkene Aziridination. Angew Chem Int Ed Engl 2024; 63:e202315162. [PMID: 38081132 DOI: 10.1002/anie.202315162] [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: 10/09/2023] [Indexed: 01/06/2024]
Abstract
N-Trifluoromethylated organics may be applied in drug design, agrochemical synthesis, and materials science, among other areas. Yet, despite recent advances in the synthesis of aliphatic, cyclic and heterocyclic N-trifluoromethyl compounds, no strategy based on trifluoromethyl nitrene has hitherto been explored. Here we describe the formation of triplet trifluoromethyl nitrene from azidotrifluoromethane, a stable and safe-to-use precursor, by visible light photocatalysis. The addition of CF3 N to alkenes via biradical intermediates afforded previously unknown aziridines substituted with trifluoromethyl group on the nitrogen atom. The obtained aziridines were converted into either N-trifluoromethylimidazolines, via formal [3+2] cycloaddition with nitriles, mediated by a Lewis acid, or into N-trifluoromethylaldimines, via ring opening and aryl group migration mediated by a strong Brønsted acid. Our findings open new opportunities for the development of novel classes of N-CF3 compounds with possible applications in the life sciences.
Collapse
Affiliation(s)
- Norbert Baris
- Institute of Organic Chemistry and Biochemistry of the Czech Academy of Sciences, Flemingovo náměstí 2, 166 00, Prague 6, Czech Republic
- Department of Organic Chemistry, Faculty of Science, Charles University, Hlavova 2030/8, 128 43, Prague, Czech Republic
| | - Martin Dračínský
- Institute of Organic Chemistry and Biochemistry of the Czech Academy of Sciences, Flemingovo náměstí 2, 166 00, Prague 6, Czech Republic
| | - Ján Tarábek
- Institute of Organic Chemistry and Biochemistry of the Czech Academy of Sciences, Flemingovo náměstí 2, 166 00, Prague 6, Czech Republic
| | - Josef Filgas
- Department of Physical Chemistry, University of Chemistry and Technology, Technická 5, 166 28, Prague, Czech Republic
| | - Petr Slavíček
- Department of Physical Chemistry, University of Chemistry and Technology, Technická 5, 166 28, Prague, Czech Republic
| | - Lucie Ludvíková
- Institute of Organic Chemistry and Biochemistry of the Czech Academy of Sciences, Flemingovo náměstí 2, 166 00, Prague 6, Czech Republic
| | - Soňa Boháčová
- Institute of Organic Chemistry and Biochemistry of the Czech Academy of Sciences, Flemingovo náměstí 2, 166 00, Prague 6, Czech Republic
| | - Tomáš Slanina
- Institute of Organic Chemistry and Biochemistry of the Czech Academy of Sciences, Flemingovo náměstí 2, 166 00, Prague 6, Czech Republic
| | - Blanka Klepetářová
- Institute of Organic Chemistry and Biochemistry of the Czech Academy of Sciences, Flemingovo náměstí 2, 166 00, Prague 6, Czech Republic
| | - Petr Beier
- Institute of Organic Chemistry and Biochemistry of the Czech Academy of Sciences, Flemingovo náměstí 2, 166 00, Prague 6, Czech Republic
| |
Collapse
|
9
|
Tao M, Qian J, Chen Z, An LK, Wilson DM, Liu J. General Synthesis of N-CF 3 Heteroaryl Amides via Successive Fluorination and Acylation of Sterically Hindered Isothiocyanates. J Org Chem 2023; 88:15237-15248. [PMID: 37823733 DOI: 10.1021/acs.joc.3c01740] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/13/2023]
Abstract
We report the one-pot synthesis of N-CF3 heteroaryl amides (NTFMHA) from heteroaryl carboxylic acids and sterically hindered isothiocyanates, including various amino acid analogues, in the presence of AgF. The key to this reaction is the utilization of free heteroaryl acyl chlorides, rather than their corresponding hydrochloride salts. This method represents a complementary method of our previous work and enables modification to a variety of previously inaccessible structures, including α-tertiary amines and N-CF3-modified pharmaceuticals.
Collapse
Affiliation(s)
- Min Tao
- School of Pharmaceutical Sciences, Sun Yat-Sen University, Guangzhou 510006, Guangdong, China
| | - Jiasheng Qian
- School of Pharmaceutical Sciences, Sun Yat-Sen University, Guangzhou 510006, Guangdong, China
| | - Zuanguang Chen
- School of Pharmaceutical Sciences, Sun Yat-Sen University, Guangzhou 510006, Guangdong, China
| | - Lin-Kun An
- School of Pharmaceutical Sciences, Sun Yat-Sen University, Guangzhou 510006, Guangdong, China
| | - David M Wilson
- Department of Radiology and Biomedical Imaging, University of California, San Francisco, San Francisco, California 94158, United States
| | - Jianbo Liu
- Department of Nuclear Medicine, The First Affiliated Hospital, Sun Yat-Sen University, Guangzhou 510080, Guangdong, China
| |
Collapse
|
10
|
Wang J, Wang SS, Xiao J, He YJ, Wu XY, Li X, Liu PN. Formal (4+2) cycloaddition of azoalkenes with trifluoromethylimidoyl sulfoxonium ylides: synthesis of trifluoromethyl pyridazine derivatives. Chem Commun (Camb) 2023; 59:12495-12498. [PMID: 37786379 DOI: 10.1039/d3cc03950a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/04/2023]
Abstract
CF3-substituted imidoyl sulfoxonium ylides (TFISYs) are extraordinarily versatile and powerful synthons for use in cyclization chemistry that affords diverse CF3-substituted N-heterocycles. We first reacted TFISYs as a two-atom synthon with readily available azoalkenes and then subjected the products to metal-free formal (4+2) cycloaddition chemistry. This protocol features mild conditions and broad substrate scope, is simple to operate, and provides highly functionalized trifluoromethylpyridazines that are widely found in bioactive molecules.
Collapse
Affiliation(s)
- Jie Wang
- Shanghai Key Laboratory of Functional Materials Chemistry, Key Laboratory for Advanced Materials, School of Chemistry and Molecular Engineering, East China University of Science & Technology, Shanghai 200237, China.
| | - Shan-Shan Wang
- Shanghai Key Laboratory of Functional Materials Chemistry, Key Laboratory for Advanced Materials, School of Chemistry and Molecular Engineering, East China University of Science & Technology, Shanghai 200237, China.
| | - Jun Xiao
- Shanghai Key Laboratory of Functional Materials Chemistry, Key Laboratory for Advanced Materials, School of Chemistry and Molecular Engineering, East China University of Science & Technology, Shanghai 200237, China.
| | - Yu-Jie He
- Shanghai Key Laboratory of Functional Materials Chemistry, Key Laboratory for Advanced Materials, School of Chemistry and Molecular Engineering, East China University of Science & Technology, Shanghai 200237, China.
| | - Xin-Yan Wu
- Shanghai Key Laboratory of Functional Materials Chemistry, Key Laboratory for Advanced Materials, School of Chemistry and Molecular Engineering, East China University of Science & Technology, Shanghai 200237, China.
| | - Xingguang Li
- Shanghai Key Laboratory of Functional Materials Chemistry, Key Laboratory for Advanced Materials, School of Chemistry and Molecular Engineering, East China University of Science & Technology, Shanghai 200237, China.
| | - Pei-Nian Liu
- Shanghai Key Laboratory of Functional Materials Chemistry, Key Laboratory for Advanced Materials, School of Chemistry and Molecular Engineering, East China University of Science & Technology, Shanghai 200237, China.
| |
Collapse
|
11
|
Sroor FM, Mahrous KF, El-Kader HAMA, Othman AM, Ibrahim NS. Impact of trifluoromethyl and sulfonyl groups on the biological activity of novel aryl-urea derivatives: synthesis, in-vitro, in-silico and SAR studies. Sci Rep 2023; 13:17560. [PMID: 37845243 PMCID: PMC10579241 DOI: 10.1038/s41598-023-44753-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2023] [Accepted: 10/11/2023] [Indexed: 10/18/2023] Open
Abstract
We designed and prepared a novel series of urea derivatives with/without sulfonyl group in their structures to investigate the impact of the sulfonyl group on the biological activity of the evaluated compounds. Antibacterial investigations indicated that derivatives 7, 8, 9, and 11 had the most antibacterial property of all the compounds examined, their minimum inhibitory concentrations (MICs) determined against B. mycoides, E. coli, and C. albicans, with compound 8 being the most active at a MIC value of 4.88 µg/mL. Anti-cancer activity has been tested against eight human cancer cell lines; A549, HCT116, PC3, A431, HePG2, HOS, PACA2 and BJ1. Compounds 7, 8 and 9 emerged IC50 values better than Doxorubicin as a reference drug. Compounds 7 and 8 showed IC50 = 44.4 and 22.4 μM respectively against PACA2 compared to Doxorubicin (IC50 = 52.1 μM). Compound 9 showed IC50 = 17.8, 12.4, and 17.6 μM against HCT116, HePG2, and HOS, respectively. qRT-PCR revealed the down-regulation of PALB2 in compounds 7 and 15 treated PACA2 cells. Also, the down-regulation of BRCA1 and BRCA2 was shown in compound 7 treated PC3 cells. As regard A549 cells, compound 8 decreased the expression level of EGFR and KRAS genes. While compounds 7 and 9 down-regulated TP53 and FASN in HCT116 cells. Molecular docking was done against Escherichia coli enoyl reductase and human Son of sevenless homolog 1 (SOS1) and the results showed the promising inhibition of the studied proteins.
Collapse
Affiliation(s)
- Farid M Sroor
- Organometallic and Organometalloid Chemistry Department, National Research Centre, Cairo, 12622, Egypt.
| | - Karima F Mahrous
- Cell Biology Department, National Research Centre, Dokki, 12622, Egypt
| | | | - Abdelmageed M Othman
- Microbial Chemistry Department, Biotechnology Research Institute, National Research Centre, Dokki, 12622, Egypt
| | - Nada S Ibrahim
- Department of Chemistry (Biochemistry Branch), Faculty of Science, Cairo University, Giza, Egypt
| |
Collapse
|
12
|
Bakhanovich O, Klepetářová B, Beier P. Rhodium(II)-catalyzed transannulation approach to N-fluoroalkylated indoles. Org Biomol Chem 2023; 21:7924-7927. [PMID: 37743800 DOI: 10.1039/d3ob01415k] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 09/26/2023]
Abstract
Copper(I)-catalyzed cycloaddition of substituted cyclohexenyl acetylenes with azido(per)fluoroalkanes afforded 4-cyclohexenyl-substituted N-(per)fluoroalkylated 1,2,3-triazoles. Their rhodium(II)-catalyzed transannulation led to fused N-(per)fluoroalkyl pyrroles and subsequent oxidation provided N-(per)fluoroalkyl indoles.
Collapse
Affiliation(s)
- Olga Bakhanovich
- Institute of Organic Chemistry and Biochemistry of the Czech Academy of Sciences, Flemingovo náměstí 2, 166 10 Prague 6, Czech Republic.
- Department of Organic Chemistry, Faculty of Science, Charles University, Hlavova 2030/8, 128 43 Prague, Czech Republic
| | - Blanka Klepetářová
- Institute of Organic Chemistry and Biochemistry of the Czech Academy of Sciences, Flemingovo náměstí 2, 166 10 Prague 6, Czech Republic.
| | - Petr Beier
- Institute of Organic Chemistry and Biochemistry of the Czech Academy of Sciences, Flemingovo náměstí 2, 166 10 Prague 6, Czech Republic.
| |
Collapse
|
13
|
Hernández-Rivera JL, Espinoza-Hicks JC, Chacón-Vargas KF, Carrillo-Campos J, Sánchez-Torres LE, Camacho-Dávila AA. Synthesis, characterization and evaluation of prenylated chalcones ethers as promising antileishmanial compounds. Mol Divers 2023; 27:2073-2092. [PMID: 36306047 DOI: 10.1007/s11030-022-10542-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2022] [Accepted: 09/30/2022] [Indexed: 11/24/2022]
Abstract
Drug therapy for leishmaniasis remains a major challenge as currently available drugs have limited efficacy, induce serious side-effects and are not accessible to everyone. Thus, the discovery of affordable drugs is urgently needed. Chalcones present a great potential as bioactive agents due to simple structure and functionalization capacity. The antileishmanial activity of different natural and synthetic chalcones have been reported. Here we report the synthesis of twenty-five novel prenylated chalcones that displayed antiparasitic activity in Leishmania mexicana. All the chalcones were evaluated at 5 µg/mL and eleven compounds exhibited a metabolic inhibition close to or exceeding 50%. Compounds 49, 30 and 55 were the three most active with IC50 values < 10 μM. These chalcones also showed the highest selectivity index (SI) values. Interestingly 49 and 55 possessing a substituent at a meta position in the B ring suggests that the substitution pattern influences antileishmanial activity. Additionally, a tridimensional model of fumarate reductase of L. mexicana was obtained by homology modeling. Docking studies suggest that prenylated chalcones could modulate fumarate reductase activity by binding with good affinity to two binding sites that are critical for the target. In conclusion, the novel prenylated chalcones could be considered as promising antileishmanial agents.
Collapse
Affiliation(s)
- Jessica Lizbeth Hernández-Rivera
- Facultad de Ciencias Químicas, Universidad Autónoma de Chihuahua, Circuito Universitario S/N, Campus Universitario II, 31125, Chihuahua, Chih., Mexico
| | - José C Espinoza-Hicks
- Facultad de Ciencias Químicas, Universidad Autónoma de Chihuahua, Circuito Universitario S/N, Campus Universitario II, 31125, Chihuahua, Chih., Mexico
| | - Karla F Chacón-Vargas
- Facultad de Ciencias Químicas, Universidad Autónoma de Chihuahua, Circuito Universitario S/N, Campus Universitario II, 31125, Chihuahua, Chih., Mexico
- Departamento de Inmunología, Escuela Nacional de Ciencias Biológicas, Instituto Politécnico Nacional, Prolongación de Carpio y Plan de Ayala, s/n, 11340, Mexico City, Mexico
| | - Javier Carrillo-Campos
- Departamento de Investigación Científica, Universidad Tecnológica de Parras de la Fuente, Calle 20 de Noviembre #100, Colonia José G. Madero, CP 27989, Parras de la Fuente, Coah., Mexico
| | - Luvia Enid Sánchez-Torres
- Departamento de Inmunología, Escuela Nacional de Ciencias Biológicas, Instituto Politécnico Nacional, Prolongación de Carpio y Plan de Ayala, s/n, 11340, Mexico City, Mexico.
| | - Alejandro A Camacho-Dávila
- Facultad de Ciencias Químicas, Universidad Autónoma de Chihuahua, Circuito Universitario S/N, Campus Universitario II, 31125, Chihuahua, Chih., Mexico.
| |
Collapse
|
14
|
Sumii Y, Shibata N. Current State of Microflow Trifluoromethylation Reactions. CHEM REC 2023; 23:e202300117. [PMID: 37309300 DOI: 10.1002/tcr.202300117] [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: 04/03/2023] [Revised: 05/25/2023] [Indexed: 06/14/2023]
Abstract
The trifluoromethyl group is a powerful structural motif in drugs and polymers; thus, developing trifluoromethylation reactions is an important area of research in organic chemistry. Over the past few decades, significant progress has been made in developing new methods for the trifluoromethylation of organic molecules, ranging from nucleophilic and electrophilic approaches to transition-metal catalysis, photocatalysis, and electrolytic reactions. While these reactions were initially developed in batch systems, more recent microflow versions are highly attractive for industrial applications owing to their scalability, safety, and time efficiency. In this review, we discuss the current state of microflow trifluoromethylation. Approaches for microflow trifluoromethylation based on different trifluoromethylation reagents are described, including continuous flow, flow photochemical, microfluidic electrochemical reactions, and large-scale microflow reactions.
Collapse
Affiliation(s)
- Yuji Sumii
- Department of Engineering, Nagoya Institute of Technology, Gokiso, Showa-Ku, Nagoya, 466-8555, Japan
| | - Norio Shibata
- Department of Engineering, Nagoya Institute of Technology, Gokiso, Showa-Ku, Nagoya, 466-8555, Japan
- Department of Nanopharmaceutical Sciences, Department of Engineering, Nagoya Institute of Technology, Gokiso, Showa-Ku, Nagoya, 466-8555, Japan
| |
Collapse
|
15
|
Crousse B. Recent Advances in the Syntheses of N-CF 3 Scaffolds up to Their Valorization. CHEM REC 2023; 23:e202300011. [PMID: 36922747 DOI: 10.1002/tcr.202300011] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2023] [Revised: 02/16/2023] [Indexed: 03/18/2023]
Abstract
This review provides a recent overview of the different synthetic routes of the N-CF3 group. This scaffold can be prepared from the desulfurization of thiocabamoyl fluorides or isothiocyanates with fluoride ions. Electrophilic and radical trifluoromethylations are also a great way to generate this motif. This report also focuses on the valorization of some N-CF3 compounds, which leads to new unknown N-trifluoromethyl derivatives. Finally, the first metabolic stability studies will be given for certain structures.
Collapse
Affiliation(s)
- Benoît Crousse
- BioCIS UMR 8076 CNRS, Building Henri Moissan, Université Paris-Saclay, 17 avenue des sciences, 91400, Orsay, France
| |
Collapse
|
16
|
Liu L, Gu YC, Zhang CP. Recent Advances in the Synthesis and Transformation of Carbamoyl Fluorides, Fluoroformates, and Their Analogues. CHEM REC 2023; 23:e202300071. [PMID: 37098875 DOI: 10.1002/tcr.202300071] [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: 02/23/2023] [Revised: 04/07/2023] [Indexed: 04/27/2023]
Abstract
Carbamoyl fluorides, fluoroformates, and their analogues are a class of important compounds and have been evidenced as versatile building blocks for the preparation of useful molecules in organic chemistry. While major achievements were made in the synthesis of carbamoyl fluorides, fluoroformates, and their analogues in the last half of 20th century, an increasing number of reports have focused on using O/S/Se=CF2 species or their equivalents as the fluorocarbonylation reagents for the direct construction of these compounds from the parent heteroatom-nucleophiles in recent years. This review mainly summarizes the advances in the synthesis and typical application of carbamoyl fluorides, fluoroformates, and their analogues by the halide exchanges and fluorocarbonylation reactions since 1980.
Collapse
Affiliation(s)
- Lei Liu
- School of Materials Science and Engineering & School of Chemistry, Chemical Engineering and Life Science, Wuhan University of Technology, 122 Luoshi Road, Wuhan, 430070, China
| | - Yu-Cheng Gu
- Syngenta, Jealott's Hill International Research Centre, Bracknell, Berkshire, RG426EY, UK
| | - Cheng-Pan Zhang
- School of Materials Science and Engineering & School of Chemistry, Chemical Engineering and Life Science, Wuhan University of Technology, 122 Luoshi Road, Wuhan, 430070, China
| |
Collapse
|
17
|
Wu H, Wang LS, Li P, Yu J, Cheng S, Yu G, Ahmad M, Meng XL, Luo H, Xu BX. Discovery of novel N-aryl-2-trifluoromethyl-quinazoline-4-amine derivatives as the inhibitors of tubulin polymerization in leukemia cells. Eur J Med Chem 2023; 256:115470. [PMID: 37201429 DOI: 10.1016/j.ejmech.2023.115470] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2023] [Revised: 05/05/2023] [Accepted: 05/05/2023] [Indexed: 05/20/2023]
Abstract
A series of new N-aryl-2-trifluoromethylquinazoline-4-amine analogs were designed and synthesized based on structure optimization of quinazoline by introducing a trifluoromethyl group into 2-position. The structures of the twenty-four newly synthesized compounds were confirmed by 1H NMR, 13C NMR and ESI-MS. The in vitro anti-cancer activity against chronic myeloid leukemia cells (K562), erythroleukemia cells (HEL), human prostate cancer cells (LNCaP), and cervical cancer cells (HeLa) of the target compounds was evaluated. Among them, compounds 15d, 15f, 15h, and 15i showed the significantly (P < 0.01) stronger growth inhibitory activity on K562 than those of the positive controls of paclitaxel and colchicine, while compounds 15a, 15d, 15e, and 15h displayed significantly stronger growth inhibitory activity on HEL than those of the positive controls. However, all the target compounds exhibited weaker growth inhibition activity against K562 and HeLa than those of the positive controls. The selectivity ratio of compounds 15h, 15d, and 15i were significantly higher than those of other active compounds, indicating that these three compounds had the lower hepatotoxicity. Several compounds displayed strong inhibition against leukemia cells. They inhibited tubulin polymerization, disrupted cellular microtubule networks by targeting the colchicine site, and promoted cell cycle arrest of leukemia cells at G2/M phase and cell apoptosis, as well as inhibiting angiogenesis. In summary, our research provided that novel synthesized N-aryl-2-trifluoromethyl-quinazoline-4-amine active derivatives as the inhibitors of tubulin polymerization in leukemia cells, which might be a valuable lead compounds for anti-leukemia agents.
Collapse
Affiliation(s)
- Hui Wu
- State Key Laboratory of Functions and Applications of Medicinal Plants, Guizhou Medical University, Guiyang, 550014, China; The Key Laboratory of Chemistry for Natural Products of Guizhou Province and Chinese Academy of Sciences, Guiyang, 550014, China; School of Pharmaceutical Sciences, Guizhou Medical University, Guiyang, 550025, China
| | - Long-Shan Wang
- State Key Laboratory of Functions and Applications of Medicinal Plants, Guizhou Medical University, Guiyang, 550014, China; The Key Laboratory of Chemistry for Natural Products of Guizhou Province and Chinese Academy of Sciences, Guiyang, 550014, China; School of Pharmaceutical Sciences, Guizhou Medical University, Guiyang, 550025, China
| | - Pei Li
- State Key Laboratory of Functions and Applications of Medicinal Plants, Guizhou Medical University, Guiyang, 550014, China; The Key Laboratory of Chemistry for Natural Products of Guizhou Province and Chinese Academy of Sciences, Guiyang, 550014, China
| | - Jia Yu
- State Key Laboratory of Functions and Applications of Medicinal Plants, Guizhou Medical University, Guiyang, 550014, China; The Key Laboratory of Chemistry for Natural Products of Guizhou Province and Chinese Academy of Sciences, Guiyang, 550014, China
| | - Sha Cheng
- State Key Laboratory of Functions and Applications of Medicinal Plants, Guizhou Medical University, Guiyang, 550014, China; The Key Laboratory of Chemistry for Natural Products of Guizhou Province and Chinese Academy of Sciences, Guiyang, 550014, China
| | - Gang Yu
- State Key Laboratory of Functions and Applications of Medicinal Plants, Guizhou Medical University, Guiyang, 550014, China; The Key Laboratory of Chemistry for Natural Products of Guizhou Province and Chinese Academy of Sciences, Guiyang, 550014, China
| | - Mashaal Ahmad
- State Key Laboratory of Functions and Applications of Medicinal Plants, Guizhou Medical University, Guiyang, 550014, China; The Key Laboratory of Chemistry for Natural Products of Guizhou Province and Chinese Academy of Sciences, Guiyang, 550014, China
| | - Xue-Ling Meng
- State Key Laboratory of Functions and Applications of Medicinal Plants, Guizhou Medical University, Guiyang, 550014, China; The Key Laboratory of Chemistry for Natural Products of Guizhou Province and Chinese Academy of Sciences, Guiyang, 550014, China
| | - Heng Luo
- State Key Laboratory of Functions and Applications of Medicinal Plants, Guizhou Medical University, Guiyang, 550014, China; The Key Laboratory of Chemistry for Natural Products of Guizhou Province and Chinese Academy of Sciences, Guiyang, 550014, China.
| | - Bi-Xue Xu
- State Key Laboratory of Functions and Applications of Medicinal Plants, Guizhou Medical University, Guiyang, 550014, China; The Key Laboratory of Chemistry for Natural Products of Guizhou Province and Chinese Academy of Sciences, Guiyang, 550014, China.
| |
Collapse
|
18
|
Dobšíková K, Javorská Ž, Paškan M, Spálovská D, Trembulaková P, Herciková J, Kuchař M, Kozmík V, Kohout M, Setnička V. Enantioseparation and a comprehensive spectroscopic analysis of novel synthetic cathinones laterally substituted with a trifluoromethyl group. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2023; 291:122320. [PMID: 36634495 DOI: 10.1016/j.saa.2023.122320] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/27/2022] [Revised: 12/20/2022] [Accepted: 01/02/2023] [Indexed: 06/17/2023]
Abstract
Recently, the number of structural modifications of synthetic cathinones has been growing making them the second largest group of new psychoactive substances in Europe. Although they are abused because of their various psychoactive effects, some compounds from this group also serve as pharmaceuticals. Since synthetic cathinones are chiral molecules with one chiral center, their biological, toxicological, and pharmacological properties may significantly differ according to their absolute configuration and enantiomeric excess. In this study, we have synthesized two substances bearing a pharmacologically interesting trifluoromethyl group and developed a chiral liquid chromatography method using a polysaccharide chiral stationary phase to separate the corresponding enantiomers of both these drugs. Subsequently, we utilized molecular spectroscopic methods including chiroptical (electronic circular dichroism and vibrational circular dichroism) and non-polarizable (infrared and ultraviolet absorption) spectroscopies. In combination with density functional theory calculations, we have obtained stable conformers of selected enantiomers in solution and their relative abundances, which we used to simulate their spectra. The experimental and calculated data have been used to elucidate the 3D structure of the enantiomerically pure compounds and assign the absolute configuration of all prepared compounds.
Collapse
Affiliation(s)
- K Dobšíková
- Department of Analytical Chemistry, University of Chemistry and Technology, Technická 5, Prague 6 166 28, Czech Republic
| | - Ž Javorská
- Department of Organic Chemistry, University of Chemistry and Technology, Technická 5, Prague 6 166 28, Czech Republic
| | - M Paškan
- Department of Organic Chemistry, University of Chemistry and Technology, Technická 5, Prague 6 166 28, Czech Republic
| | - D Spálovská
- Department of Analytical Chemistry, University of Chemistry and Technology, Technická 5, Prague 6 166 28, Czech Republic
| | - P Trembulaková
- Department of Analytical Chemistry, University of Chemistry and Technology, Technická 5, Prague 6 166 28, Czech Republic
| | - J Herciková
- Department of Organic Chemistry, University of Chemistry and Technology, Technická 5, Prague 6 166 28, Czech Republic
| | - M Kuchař
- Forensic Laboratory of Biologically Active Substances, Department of Chemistry of Natural Compounds, University of Chemistry and Technology, Technická 5, Prague 6 166 28, Czech Republic; Psychedelic Research Centre, National Institute of Mental Health, Topolová 748, 250 67 Klecany, Czech Republic
| | - V Kozmík
- Department of Organic Chemistry, University of Chemistry and Technology, Technická 5, Prague 6 166 28, Czech Republic
| | - M Kohout
- Department of Organic Chemistry, University of Chemistry and Technology, Technická 5, Prague 6 166 28, Czech Republic
| | - V Setnička
- Department of Analytical Chemistry, University of Chemistry and Technology, Technická 5, Prague 6 166 28, Czech Republic.
| |
Collapse
|
19
|
Lei Z, Chang W, Guo H, Feng J, Zhang Z. A Brief Review on the Synthesis of the N-CF3 Motif in Heterocycles. Molecules 2023; 28:molecules28073012. [PMID: 37049775 PMCID: PMC10095997 DOI: 10.3390/molecules28073012] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2023] [Revised: 03/21/2023] [Accepted: 03/24/2023] [Indexed: 03/30/2023] Open
Abstract
The trifluoromethyl group is widely recognized for its significant role in the fields of medicinal chemistry and material science due to its unique electronic and steric properties that can alter various physiochemical properties of the parent molecule, such as lipophilicity, acidity, and hydrogen bonding capabilities. Compared to the well-established C-trifluoromethylation, N-trifluoromethylation has received lesser attention. Considering the extensive contribution of nitrogen to drug molecules, it is predicted that constructing N-trifluoromethyl (N-CF3) motifs will be of great significance in pharmaceutical and agrochemical industries. This review is mainly concerned with the synthesis of heterocycles containing this motif. In three-membered heterocycles containing the N-CF3 motif, the existing literature mostly demonstrated the synthetic strategy, as it does for four- and larger-membered heterocycles. Certain structures, such as oxaziridines, could serve as an oxidant or building blocks in organic synthesis. In five-membered heterocycles, it has been reported that N-CF3 azoles showed a higher lipophilicity and a latent increased metabolic stability and Caco-2-permeability compared with their N-CH3 counterparts, illustrating the potential of the N-CF3 motif. Various N-CF3 analogues of drugs or bioactive molecules, such as sildenafil analogue, have been obtained. In general, the N-CF3 motif is developing and has great potential in bioactive molecules or materials. Give the recent development in this motif, it is foreseeable that its synthesis methods and applications will become more and more extensive. In this paper, we present an overview of the synthesis of N-CF3 heterocycles, categorized on the basis of the number of rings (three-, four-, five-, six- and larger-membered heterocycles), and focus on the five-membered heterocycles containing the N-CF3 group.
Collapse
|
20
|
Said MS, Khonde NS, Kumar P, Gajbhiye JM. Electron-Deficient Fluoroarene-Mediated Synthesis of Trifluoromethyl Ketones from Carboxylic Acids. Org Lett 2023; 25:1094-1098. [PMID: 36757825 DOI: 10.1021/acs.orglett.2c04318] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/10/2023]
Abstract
Fluoroarene-mediated trifluoromethylation of carboxylic acids for the synthesis of trifluoromethyl ketones is disclosed. The fluoroarene activates the acid group and generates the fluoride source in situ for the trifluoromethylation reaction. The present protocol is safe and metal-free, operates under mild reaction conditions, and does not require any external additives to generate trifluoromethyl anion. The current transformation provides good functional group tolerance and also delivers 92% and 88% yields of trifluoromethyl ketones in batch and continuous flow, respectively.
Collapse
Affiliation(s)
- Madhukar S Said
- Division of Organic Chemistry, CSIR-National Chemical Laboratory, Dr. Homi Bhabha Road, Pune 411008, India.,Academy of Scientific and Innovative Research (AcSIR), Ghaziabad 201002, India
| | - Nilesh S Khonde
- Division of Organic Chemistry, CSIR-National Chemical Laboratory, Dr. Homi Bhabha Road, Pune 411008, India.,Academy of Scientific and Innovative Research (AcSIR), Ghaziabad 201002, India
| | - Pradeep Kumar
- Division of Organic Chemistry, CSIR-National Chemical Laboratory, Dr. Homi Bhabha Road, Pune 411008, India.,Academy of Scientific and Innovative Research (AcSIR), Ghaziabad 201002, India
| | - Jayant M Gajbhiye
- Division of Organic Chemistry, CSIR-National Chemical Laboratory, Dr. Homi Bhabha Road, Pune 411008, India.,Academy of Scientific and Innovative Research (AcSIR), Ghaziabad 201002, India
| |
Collapse
|
21
|
Electrochemical synthesis of 5-trifluoroethyl dihydrobenzimidazo[2,1-a] isoquinolines from pendent unactivated alkenes via radical relay. Tetrahedron Lett 2023. [DOI: 10.1016/j.tetlet.2023.154410] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/21/2023]
|
22
|
Zivkovic FG, D-T Nielsen C, Schoenebeck F. Access to N-CF 3 Formamides by Reduction of N-CF 3 Carbamoyl Fluorides. Angew Chem Int Ed Engl 2022; 61:e202213829. [PMID: 36308723 PMCID: PMC10099374 DOI: 10.1002/anie.202213829] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2022] [Indexed: 11/06/2022]
Abstract
The departure into unknown chemical space is essential for the discovery of new properties and function. We herein report the first synthetic access to N-trifluoromethylated formamides. The method involves the reduction of bench-stable NCF3 carbamoyl fluorides and is characterized by operational simplicity and mildness, tolerating a broad range of functional groups as well as stereocenters. The newly made N-CF3 formamide motif proved to be highly robust and compatible with diverse chemical transformations, underscoring its potential as building block in complex functional molecules.
Collapse
Affiliation(s)
- Filip G Zivkovic
- Institute of Organic Chemistry, RWTH Aachen University, Landoltweg 1, 52074, Aachen, Germany
| | - Christian D-T Nielsen
- Institute of Organic Chemistry, RWTH Aachen University, Landoltweg 1, 52074, Aachen, Germany
| | - Franziska Schoenebeck
- Institute of Organic Chemistry, RWTH Aachen University, Landoltweg 1, 52074, Aachen, Germany
| |
Collapse
|
23
|
Diamanti E, Méndez M, Ross T, Kuttruff CA, Lefranc J, Klingler FM, von Nussbaum F, Jung M, Gehringer M. Frontiers in Medicinal Chemistry 2022 Goes Virtual. ChemMedChem 2022; 17:e202200419. [PMID: 36198574 DOI: 10.1002/cmdc.202200419] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2022] [Indexed: 11/09/2022]
Abstract
The Frontiers in Medicinal Chemistry (FiMC) meeting, which represents the largest international medicinal chemistry conference in Germany, took place from March 14th to 16th 2022 in a fully virtual format. Organized by the Division of Medicinal Chemistry of the German Chemical Society (GDCh) together with the Division of Pharmaceutical & Medicinal Chemistry of the German Pharmaceutical Society (DPhG) and a "local" organization committee from the University of Freiburg headed by Manfred Jung, the meeting brought together 271 participants from around 20 countries. The program included 33 lectures by leading scientists from industry and academia as well as early career investigators. 67 posters were presented in two poster sessions and with over 20.000 poster abstract downloads. The general organization and the time-shift function were very much appreciated as demonstrated by almost 600 on-demand contents retrieved. The online format fitted perfectly to bring together medicinal chemists from academia and industry across the globe.
Collapse
Affiliation(s)
- Eleonora Diamanti
- HIPS - Helmholtz-Institut für Pharmazeutische Forschung Saarland, Campus E8 1, 66123, Saarbrücken, Germany
| | - María Méndez
- Sanofi R&D, Integrated Drug Discovery, Industriepark Höchst, Blg. G838, 65926, Frankfurt am Main, Germany
| | - Tatjana Ross
- Merck Healthcare KGaA, Frankfurter Straße 250, 64293, Darmstadt, Germany
| | - Christian A Kuttruff
- Boehringer Ingelheim International GmbH, Birkendorfer Straße 65, 88397, Biberach an der Riss, Germany
| | - Julien Lefranc
- Merck Healthcare KGaA, Frankfurter Straße 250, 64293, Darmstadt, Germany
| | | | - Franz von Nussbaum
- NUVISAN Innovation Campus Berlin, NUVISAN ICB GmbH, Muellerstr. 178, 13353, Berlin, Germany
| | - Manfred Jung
- Institute of Pharmaceutical Sciences, Albert-Ludwigs-Universität Freiburg, Albertstraße 25, 79104, Freiburg im Breisgau, Germany
| | - Matthias Gehringer
- University of Tübingen, Institute of Pharmaceutical Sciences, Pharmaceutical/Medicinal Chemistry Department, Auf der Morgenstelle 8, 72076, Tübingen, Germany
| |
Collapse
|
24
|
Turksoy A, Bouayad‐Gervais S, Schoenebeck F. N
‐CF
3
Imidazolidin‐2‐one Derivatives via Photocatalytic and Silver‐Catalyzed Cyclizations. Chemistry 2022; 28:e202201435. [DOI: 10.1002/chem.202201435] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2022] [Indexed: 11/08/2022]
Affiliation(s)
- Abdurrahman Turksoy
- Institute of Organic Chemistry RWTH Aachen University Landoltweg 1 52074 Aachen Germany
| | - Samir Bouayad‐Gervais
- Institute of Organic Chemistry RWTH Aachen University Landoltweg 1 52074 Aachen Germany
| | - Franziska Schoenebeck
- Institute of Organic Chemistry RWTH Aachen University Landoltweg 1 52074 Aachen Germany
| |
Collapse
|
25
|
Ma C, Meng H, He X, Jiang Y, Yu B. Visible-Light-Promoted Transition-Metal-Free Construction of 3-Perfluoroalkylated Thioflavones. Front Chem 2022; 10:953978. [PMID: 35910726 PMCID: PMC9326344 DOI: 10.3389/fchem.2022.953978] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2022] [Accepted: 06/15/2022] [Indexed: 11/30/2022] Open
Abstract
A visible-light-promoted transition-metal-free perfluoroalkylation/cyclization reaction was developed with 9-mesityl-10-methylacridinium perchlorate (Acr+-Mes·ClO4−) as the photocatalyst, by which various perfluoroalkyl-substituted heterocycles including thioflavones, oxindoles, and quinoline-2,4(1H,3H)-diones were prepared at room temperature. Moreover, the potential of this sustainable method is demonstrated by the excellent in vitro anti-lymphoma and cervical carcinoma activity of the novel 3-perfluoroalkylated thioflavone 3m.
Collapse
Affiliation(s)
- Chunhua Ma
- Collaborative Innovation Centre of Henan Province for Green Manufacturing of Fine Chemicals, Key Laboratory of Green Chemical Media and Reactions, Ministry of Education, Henan Engineering Research Centre of Chiral Hydroxyl Pharmaceutical, Henan Engineering Laboratory of Chemical Pharmaceutical and Biomedical Materials, School of Chemistry and Chemical Engineering, Henan Normal University, Xinxiang, China
| | - Hui Meng
- Collaborative Innovation Centre of Henan Province for Green Manufacturing of Fine Chemicals, Key Laboratory of Green Chemical Media and Reactions, Ministry of Education, Henan Engineering Research Centre of Chiral Hydroxyl Pharmaceutical, Henan Engineering Laboratory of Chemical Pharmaceutical and Biomedical Materials, School of Chemistry and Chemical Engineering, Henan Normal University, Xinxiang, China
| | - Xing He
- Collaborative Innovation Centre of Henan Province for Green Manufacturing of Fine Chemicals, Key Laboratory of Green Chemical Media and Reactions, Ministry of Education, Henan Engineering Research Centre of Chiral Hydroxyl Pharmaceutical, Henan Engineering Laboratory of Chemical Pharmaceutical and Biomedical Materials, School of Chemistry and Chemical Engineering, Henan Normal University, Xinxiang, China
| | - Yuqin Jiang
- Collaborative Innovation Centre of Henan Province for Green Manufacturing of Fine Chemicals, Key Laboratory of Green Chemical Media and Reactions, Ministry of Education, Henan Engineering Research Centre of Chiral Hydroxyl Pharmaceutical, Henan Engineering Laboratory of Chemical Pharmaceutical and Biomedical Materials, School of Chemistry and Chemical Engineering, Henan Normal University, Xinxiang, China
- *Correspondence: Yuqin Jiang, ; Bing Yu,
| | - Bing Yu
- Green Catalysis Center, College of Chemistry, Zhengzhou University, Zhengzhou, China
- *Correspondence: Yuqin Jiang, ; Bing Yu,
| |
Collapse
|
26
|
Taponard A, Jarrosson T, Khrouz L, Médebielle M, Broggi J, Tlili A. Metal-Free SF 6 Activation: A New SF 5 -Based Reagent Enables Deoxyfluorination and Pentafluorosulfanylation Reactions. Angew Chem Int Ed Engl 2022; 61:e202204623. [PMID: 35471641 DOI: 10.1002/anie.202204623] [Citation(s) in RCA: 23] [Impact Index Per Article: 11.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2022] [Indexed: 12/13/2022]
Abstract
The activation of SF6 , a potent greenhouse gas, under metal-free and visible light conditions is reported. Herein, mechanistic investigations including EPR spectroscopy, NMR studies and cyclic voltammetry allowed the rational design of a new fluorinating reagent which was synthesized from the 2-electron activation of SF6 with commercially available TDAE. This new SF5 -based reagent was efficiently employed for the deoxyfluorination of CO2 and the fluorinative desulfurization of CS2 allowing the formation of useful fluorinated amines. Moreover, for the first time we demonstrated that our SF5 -based reagent could afford the mild generation of Cl-SF5 gas. This finding was exploited for the chloro-pentafluorosulfanylation of alkynes and alkenes.
Collapse
Affiliation(s)
- Alexis Taponard
- Institute of Chemistry and Biochemistry (ICBMS-UMR CNRS 5246), Univ Lyon, Université Lyon 1, CNRS, CPE-Lyon, INSA, 43 Bd du 11 Novembre 1918, 69622, Villeurbanne, France
| | - Tristan Jarrosson
- Institute of Chemistry and Biochemistry (ICBMS-UMR CNRS 5246), Univ Lyon, Université Lyon 1, CNRS, CPE-Lyon, INSA, 43 Bd du 11 Novembre 1918, 69622, Villeurbanne, France
| | - Lhoussain Khrouz
- ENSL, CNRS, Laboratoire de Chimie UMR 5182, 46 allée d'Italie, 69364, Lyon, France
| | - Maurice Médebielle
- Institute of Chemistry and Biochemistry (ICBMS-UMR CNRS 5246), Univ Lyon, Université Lyon 1, CNRS, CPE-Lyon, INSA, 43 Bd du 11 Novembre 1918, 69622, Villeurbanne, France
| | - Julie Broggi
- Aix Marseille Univ, CNRS, Institut de Chimie Radicalaire (ICR)ICR UMR 7273, Faculty of Pharmacy, 27 Bd Jean Moulin, 13385, Marseille, France
| | - Anis Tlili
- Institute of Chemistry and Biochemistry (ICBMS-UMR CNRS 5246), Univ Lyon, Université Lyon 1, CNRS, CPE-Lyon, INSA, 43 Bd du 11 Novembre 1918, 69622, Villeurbanne, France
| |
Collapse
|
27
|
Schaub S, Becker J, Schindler S. A Facile and Inexpensive Way to Synthesize N‐trifluoromethyl Compounds. ChemistrySelect 2022. [DOI: 10.1002/slct.202201803] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Stefan Schaub
- Institute of Inorganic and Analytical Chemistry Justus-Liebig-Universität Gießen Heinrich-Buff-Ring 17 35392 Gießen Germany
| | - Jonathan Becker
- Institute of Inorganic and Analytical Chemistry Justus-Liebig-Universität Gießen Heinrich-Buff-Ring 17 35392 Gießen Germany
| | - Siegfried Schindler
- Institute of Inorganic and Analytical Chemistry Justus-Liebig-Universität Gießen Heinrich-Buff-Ring 17 35392 Gießen Germany
| |
Collapse
|
28
|
Taponard A, Jarrosson T, Khrouz L, Médebielle M, Broggi J, Tlili A. Metal‐Free SF
6
Activation: A New SF
5
‐Based Reagent Enables Deoxyfluorination and Pentafluorosulfanylation Reactions. Angew Chem Int Ed Engl 2022. [DOI: 10.1002/ange.202204623] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Affiliation(s)
- Alexis Taponard
- Institute of Chemistry and Biochemistry (ICBMS-UMR CNRS 5246) Univ Lyon, Université Lyon 1, CNRS, CPE-Lyon, INSA 43 Bd du 11 Novembre 1918 69622 Villeurbanne France
| | - Tristan Jarrosson
- Institute of Chemistry and Biochemistry (ICBMS-UMR CNRS 5246) Univ Lyon, Université Lyon 1, CNRS, CPE-Lyon, INSA 43 Bd du 11 Novembre 1918 69622 Villeurbanne France
| | - Lhoussain Khrouz
- ENSL, CNRS, Laboratoire de Chimie UMR 5182 46 allée d'Italie 69364 Lyon France
| | - Maurice Médebielle
- Institute of Chemistry and Biochemistry (ICBMS-UMR CNRS 5246) Univ Lyon, Université Lyon 1, CNRS, CPE-Lyon, INSA 43 Bd du 11 Novembre 1918 69622 Villeurbanne France
| | - Julie Broggi
- Aix Marseille Univ, CNRS Institut de Chimie Radicalaire (ICR)ICR UMR 7273 Faculty of Pharmacy 27 Bd Jean Moulin 13385 Marseille France
| | - Anis Tlili
- Institute of Chemistry and Biochemistry (ICBMS-UMR CNRS 5246) Univ Lyon, Université Lyon 1, CNRS, CPE-Lyon, INSA 43 Bd du 11 Novembre 1918 69622 Villeurbanne France
| |
Collapse
|
29
|
Li X, Zhang HJ, Li ZH, Wu LQ, Deng AJ, Qin HL. Trifluoromethylation of dihydrocoptisines and the effect on structural stability and XBP1-activating activity. JOURNAL OF ASIAN NATURAL PRODUCTS RESEARCH 2022; 24:388-396. [PMID: 34132154 DOI: 10.1080/10286020.2021.1935895] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/29/2021] [Accepted: 05/24/2021] [Indexed: 06/12/2023]
Abstract
In order to obtain new dihydrocoptisine-type compounds with stable structure and activating XBP1 transcriptional activity, (±)-8-trifluoromethyldihydrocoptisine derivatives as target compounds were synthesized from quaternary ammonium chlorides of coptisine alkaloids as starting materials by a one-step reaction. The structures of the synthesized compounds were confirmed by 1H-, 13C-, and 19F-NMR as well as HRESIMS methods. These compounds showed more significant structural stability and activating XBP1 transcription activity in vitro than dihydrocoptisine as positive control. No obvious cytotoxicity on normal cell in vitro was observed with (±)-8-trifluoromethyldihydrocoptisines. Trifluoromethylation can be used as one of the fluorine modification strategies for dihydrocoptisines to guide follow-up studies on structural modification of coptisine-type alkaloids and on anti-Ulcerative colitis drugs with coptisines.
Collapse
Affiliation(s)
- Xiang Li
- State Key Laboratory of Bioactive Substance and Function of Natural Medicines, Institute of Materia Medica, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100050, China
| | - Hai-Jing Zhang
- State Key Laboratory of Bioactive Substance and Function of Natural Medicines, Institute of Materia Medica, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100050, China
| | - Zhi-Hong Li
- State Key Laboratory of Bioactive Substance and Function of Natural Medicines, Institute of Materia Medica, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100050, China
| | - Lian-Qiu Wu
- State Key Laboratory of Bioactive Substance and Function of Natural Medicines, Institute of Materia Medica, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100050, China
| | - An-Jun Deng
- State Key Laboratory of Bioactive Substance and Function of Natural Medicines, Institute of Materia Medica, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100050, China
| | - Hai-Lin Qin
- State Key Laboratory of Bioactive Substance and Function of Natural Medicines, Institute of Materia Medica, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100050, China
| |
Collapse
|
30
|
Bouayad-Gervais S, Nielsen CDT, Turksoy A, Sperger T, Deckers K, Schoenebeck F. Access to Cyclic N-Trifluoromethyl Ureas through Photocatalytic Activation of Carbamoyl Azides. J Am Chem Soc 2022; 144:6100-6106. [PMID: 35333063 DOI: 10.1021/jacs.2c02004] [Citation(s) in RCA: 14] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
We report the mild activation of carbamoyl azides to the corresponding nitrenes using a blue light/[Ir]-catalyzed strategy, which enables stereospecific access to N-trifluoromethyl imidazolidinones and benzimidazolones. These novel structural motifs proved to be highly robust, allowing their downstream diversification. On the basis of our combined computational and experimental studies, we propose that an electron rebound with the excited metal catalyst is undergone, involving a reduction-triggered nitrogen loss, followed by oxidation to the corresponding carbamoyl nitrene and subsequent C-H insertion.
Collapse
Affiliation(s)
- Samir Bouayad-Gervais
- Institute of Organic Chemistry, RWTH Aachen University, Landoltweg 1, 52074 Aachen, Germany
| | - Christian D-T Nielsen
- Institute of Organic Chemistry, RWTH Aachen University, Landoltweg 1, 52074 Aachen, Germany
| | - Abdurrahman Turksoy
- Institute of Organic Chemistry, RWTH Aachen University, Landoltweg 1, 52074 Aachen, Germany
| | - Theresa Sperger
- Institute of Organic Chemistry, RWTH Aachen University, Landoltweg 1, 52074 Aachen, Germany
| | - Kristina Deckers
- Institute of Organic Chemistry, RWTH Aachen University, Landoltweg 1, 52074 Aachen, Germany
| | - Franziska Schoenebeck
- Institute of Organic Chemistry, RWTH Aachen University, Landoltweg 1, 52074 Aachen, Germany
| |
Collapse
|
31
|
Ibara M, Abe T, Sawada D. Chemo- and Site-Selective Replacement of N-Terminal Carbamates in Peptides. Org Lett 2022; 24:2131-2136. [PMID: 35285651 DOI: 10.1021/acs.orglett.2c00370] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
In peptide synthesis, it is important to distinguish the terminal amino group and carry out the selective transformation of only the N-terminal protecting group. We describe herein a reaction for the chemo- and site-selective replacement of carbamates with various other carbamates only at the N-terminus of peptides. We demonstrate the scope of carbamates and peptides and the introduction of fluorine into a peptide. This strategy is applicable to the late stage of peptide synthesis.
Collapse
Affiliation(s)
- Miho Ibara
- Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama University, 1-1-1 Tsushima-naka, Kita-ku, Okayama 7008530, Japan
| | - Takumi Abe
- Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama University, 1-1-1 Tsushima-naka, Kita-ku, Okayama 7008530, Japan
| | - Daisuke Sawada
- Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama University, 1-1-1 Tsushima-naka, Kita-ku, Okayama 7008530, Japan
| |
Collapse
|
32
|
Mykhailiuk PK. Fluorine-Containing Prolines: Synthetic Strategies, Applications, and Opportunities. J Org Chem 2022; 87:6961-7005. [PMID: 35175772 DOI: 10.1021/acs.joc.1c02956] [Citation(s) in RCA: 11] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Fluorinated prolines play an important role in peptide studies, protein engineering, medicinal chemistry, drug discovery, and agrochemistry. Since the first synthesis of 4-fluoroprolines by Gottlieb and Witkop in 1965, their popularity started to grow exponentially. For example, during the past two decades, all isomeric trifluoromethyl-substituted prolines have been synthesized. In this Perspective, chemical properties and applications of fluorinated prolines are discussed. Synthetic approaches to all known fluorine-containing prolines are also discussed and analyzed. This analysis unexpectedly revealed an unsolved problem: in strict contrast to fluoro- and trifluoromethyl-substituted prolines, the corresponding analogues with fluoromethyl and difluoromethyl groups are mostly unknown. At the end of the paper, structures of several interesting, yet unknown, fluorinated prolines are disclosed─a good opportunity for chemists to make them.
Collapse
|
33
|
Madhu D, Jetti VR, Narsaiah B, Punna N. 3-Trifluoroacetyl-quinolin-2(1 H)-ones as Carbonyl and Acid Surrogates in the Passerini-/Ugi-Type Reaction. J Org Chem 2022; 87:2301-2314. [PMID: 35157465 DOI: 10.1021/acs.joc.1c02107] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Herein, we report tailored 3-trifluoroacetyl-quinolin-2(1H)-ones (1) as carbonyl and acid surrogates in Passerini- and Ugi-type reactions for the synthesis of α-trifluoromethyl-α-hydroxy carboxamides (4) and α-trifluoromethyl α-amino acids (6) in high yields, respectively. The reaction proceeds under mild reaction conditions via an exocyclic carboximidate intermediate (3). The amide group in compound 1 acts as an acid component as well as a reversible oxygen nucleophile to facilitate the reaction.
Collapse
Affiliation(s)
- Desagoni Madhu
- Department of Organic Synthesis & Process Chemistry, CSIR-Indian Institute of Chemical Technology (CSIR-IICT), Hyderabad 500007, India.,Academy of Scientific and Innovative Research (AcSIR), Ghaziabad 201002, India
| | - Vatsala Rani Jetti
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad 201002, India
| | - Banda Narsaiah
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad 201002, India
| | - Nagender Punna
- Department of Organic Synthesis & Process Chemistry, CSIR-Indian Institute of Chemical Technology (CSIR-IICT), Hyderabad 500007, India.,Academy of Scientific and Innovative Research (AcSIR), Ghaziabad 201002, India
| |
Collapse
|
34
|
Liu S, Huang Y, Wang J, Qing FL, Xu XH. General Synthesis of N-Trifluoromethyl Compounds with N-Trifluoromethyl Hydroxylamine Reagents. J Am Chem Soc 2022; 144:1962-1970. [DOI: 10.1021/jacs.1c12467] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Affiliation(s)
- Shuai Liu
- College of Chemistry, Chemical Engineering and Biotechnology, Donghua University, 2999 North Renmin Lu, Shanghai 201620, China
| | - Yangen Huang
- College of Chemistry, Chemical Engineering and Biotechnology, Donghua University, 2999 North Renmin Lu, Shanghai 201620, China
| | - Juan Wang
- College of Chemistry, Chemical Engineering and Biotechnology, Donghua University, 2999 North Renmin Lu, Shanghai 201620, China
| | - Feng-Ling Qing
- Key Laboratory of Organofluorine Chemistry, Shanghai Institute of Organic Chemistry, University of Chinese Academy of Science, Chinese Academy of Science, 345 Lingling Lu, Shanghai 200032, China
| | - Xiu-Hua Xu
- Key Laboratory of Organofluorine Chemistry, Shanghai Institute of Organic Chemistry, University of Chinese Academy of Science, Chinese Academy of Science, 345 Lingling Lu, Shanghai 200032, China
| |
Collapse
|
35
|
Zhang RZ, Zhang RX, Wang S, Xu C, Guan W, Wang M. An N-Trifluoromethylation/Cyclization Strategy for Accessing Diverse N-Trifluoromethyl Azoles from Nitriles and 1,3-Dipoles. Angew Chem Int Ed Engl 2022; 61:e202110749. [PMID: 34704326 DOI: 10.1002/anie.202110749] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2021] [Revised: 09/27/2021] [Indexed: 01/14/2023]
Abstract
N-Trifluoromethyl azoles are valuable targets in medicinal chemistry, but their synthesis is challenging. Classical preparation of N-CF3 azoles relies on the functional group interconversions but suffers from tedious N-pre-functionalization and unfriendly agents. Introduction of the CF3 onto the nitrogen of heterocycles provides a direct route to such motifs, but the N-trifluoromethylation remains underdeveloped. Reported here is an alternative and scalable cyclization strategy based on NCF3 -containing synthons for constructing N-CF3 azoles. The approach involves the N-trifluoromethylation of nitriles followed by a [3+2] cyclization between resulting N-CF3 nitrilium derivatives and 1,3-dipoles. PhICF3 Cl was an effective CF3 source for the transformation. As a result, a generic platform is established to divergently synthesize N-trifluoromethylated tetrazoles, imidazoles, and 1,2,3-triazoles by using sodium azide, activated methylene isocyanides, and diazo compounds as dipoles.
Collapse
Affiliation(s)
- Ru Zhong Zhang
- Jilin Province Key Laboratory of Organic Functional Molecular Design & Synthesis, College of Chemistry, Northeast Normal University, 5268 Renmin Street, Changchun, 130024, China
| | - Ru Xue Zhang
- Jilin Province Key Laboratory of Organic Functional Molecular Design & Synthesis, College of Chemistry, Northeast Normal University, 5268 Renmin Street, Changchun, 130024, China
| | - Shuang Wang
- Institute of Functional of Material, College of Chemistry, Northeast Normal University, 5268 Renmin Street, Changchun, 130024, China
| | - Cong Xu
- Jilin Province Key Laboratory of Organic Functional Molecular Design & Synthesis, College of Chemistry, Northeast Normal University, 5268 Renmin Street, Changchun, 130024, China
| | - Wei Guan
- Institute of Functional of Material, College of Chemistry, Northeast Normal University, 5268 Renmin Street, Changchun, 130024, China
| | - Mang Wang
- Jilin Province Key Laboratory of Organic Functional Molecular Design & Synthesis, College of Chemistry, Northeast Normal University, 5268 Renmin Street, Changchun, 130024, China
| |
Collapse
|
36
|
Zhang RZ, Zhang RX, Wang S, Xu C, Guan W, Wang M. An
N
‐Trifluoromethylation/Cyclization Strategy for Accessing Diverse
N
‐Trifluoromethyl Azoles from Nitriles and 1,3‐Dipoles. Angew Chem Int Ed Engl 2022. [DOI: 10.1002/ange.202110749] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Ru Zhong Zhang
- Jilin Province Key Laboratory of Organic Functional Molecular Design & Synthesis College of Chemistry Northeast Normal University 5268 Renmin Street Changchun 130024 China
| | - Ru Xue Zhang
- Jilin Province Key Laboratory of Organic Functional Molecular Design & Synthesis College of Chemistry Northeast Normal University 5268 Renmin Street Changchun 130024 China
| | - Shuang Wang
- Institute of Functional of Material College of Chemistry Northeast Normal University 5268 Renmin Street Changchun 130024 China
| | - Cong Xu
- Jilin Province Key Laboratory of Organic Functional Molecular Design & Synthesis College of Chemistry Northeast Normal University 5268 Renmin Street Changchun 130024 China
| | - Wei Guan
- Institute of Functional of Material College of Chemistry Northeast Normal University 5268 Renmin Street Changchun 130024 China
| | - Mang Wang
- Jilin Province Key Laboratory of Organic Functional Molecular Design & Synthesis College of Chemistry Northeast Normal University 5268 Renmin Street Changchun 130024 China
| |
Collapse
|
37
|
Yan ZH, Li WC, Wu YH, Yan QB, Wei ZL, Liao WW. Electrochemical cyclization of N-cyanamide alkenes with CF 3SO 2Na to access C, N-(bis)trifluoromethylated cyclic amidines and related compounds. Org Chem Front 2022. [DOI: 10.1039/d2qo01323a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
An electrochemical trifluoromethylative cyclization of N-cyanamide alkenes and alkynes is presented, which afforded (bis)-C,N-trifluoromethylated cyclic amidines, azines and amides with selective multiple bond formations in a controllable manner.
Collapse
Affiliation(s)
- Zhi-Hua Yan
- Department of Organic Chemistry, College of Chemistry, Jilin University, Changchun 130012, P. R. China
| | - Wen-Cheng Li
- Department of Organic Chemistry, College of Chemistry, Jilin University, Changchun 130012, P. R. China
| | - Yu-Heng Wu
- Department of Organic Chemistry, College of Chemistry, Jilin University, Changchun 130012, P. R. China
| | - Qi-Bo Yan
- Department of Organic Chemistry, College of Chemistry, Jilin University, Changchun 130012, P. R. China
| | - Zhong-Lin Wei
- Department of Organic Chemistry, College of Chemistry, Jilin University, Changchun 130012, P. R. China
| | - Wei-Wei Liao
- Department of Organic Chemistry, College of Chemistry, Jilin University, Changchun 130012, P. R. China
- State Key Laboratory of Organometallic Chemistry, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, Shanghai 200032, P. R. China
| |
Collapse
|
38
|
Li H, Peng X, Nie L, Zhou L, Yang M, Li F, Hu J, Yao Z, Liu L. Graphene oxide-catalyzed trifluoromethylation of alkynes with quinoxalinones and Langlois' reagent. RSC Adv 2021; 11:38667-38673. [PMID: 35493205 PMCID: PMC9044184 DOI: 10.1039/d1ra07014b] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2021] [Accepted: 11/18/2021] [Indexed: 12/13/2022] Open
Abstract
The direct C–H trifluoromethylation of alkynes and quinoxalinones has been achieved using a graphene oxide/Langlois' reagent system. This multi-component tandem reaction using graphene oxide as the catalyst and Langlois' reagent as the robust CF3 radical source results in the formation of olefinic C–CF3 to access a series of 3-trifluoroalkylated quinoxalin-2(1H)-ones. The direct C–H trifluoromethylation of alkynes and quinoxalinones using a graphene oxide/Langlois' reagent system.![]()
Collapse
Affiliation(s)
- Hong Li
- Key Laboratory of Organo-Pharmaceutical Chemistry of Jiangxi Province, Gannan Normal University Ganzhou Jiangxi 341000 P. R. China
| | - Xiangjun Peng
- Key Laboratory of Prevention and Treatment of Cardiovascular and Cerebrovascular Diseases of Ministry of Education, Gannan Medical University Ganzhou 341000 P. R. China
| | - Liang Nie
- Key Laboratory of Organo-Pharmaceutical Chemistry of Jiangxi Province, Gannan Normal University Ganzhou Jiangxi 341000 P. R. China
| | - Lin Zhou
- Key Laboratory of Organo-Pharmaceutical Chemistry of Jiangxi Province, Gannan Normal University Ganzhou Jiangxi 341000 P. R. China
| | - Ming Yang
- Key Laboratory of Organo-Pharmaceutical Chemistry of Jiangxi Province, Gannan Normal University Ganzhou Jiangxi 341000 P. R. China
| | - Fan Li
- Key Laboratory of Organo-Pharmaceutical Chemistry of Jiangxi Province, Gannan Normal University Ganzhou Jiangxi 341000 P. R. China
| | - Jian Hu
- Key Laboratory of Prevention and Treatment of Cardiovascular and Cerebrovascular Diseases of Ministry of Education, Gannan Medical University Ganzhou 341000 P. R. China
| | - Zhiyang Yao
- Key Laboratory of Prevention and Treatment of Cardiovascular and Cerebrovascular Diseases of Ministry of Education, Gannan Medical University Ganzhou 341000 P. R. China
| | - Liangxian Liu
- Key Laboratory of Organo-Pharmaceutical Chemistry of Jiangxi Province, Gannan Normal University Ganzhou Jiangxi 341000 P. R. China
| |
Collapse
|
39
|
Grygorenko OO, Volochnyuk DM, Vashchenko BV. Emerging Building Blocks for Medicinal Chemistry: Recent Synthetic Advances. European J Org Chem 2021. [DOI: 10.1002/ejoc.202100857] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Affiliation(s)
- Oleksandr O. Grygorenko
- Enamine Ltd. Chervonotkatska 78 Kyiv 02094 Ukraine
- Taras Shevchenko National University of Kyiv Volodymyrska Street 60 Kyiv 01601 Ukraine
| | - Dmitriy M. Volochnyuk
- Enamine Ltd. Chervonotkatska 78 Kyiv 02094 Ukraine
- Taras Shevchenko National University of Kyiv Volodymyrska Street 60 Kyiv 01601 Ukraine
- Institute of Organic Chemistry National Academy of Sciences of Ukraine Murmanska Street 5 Kyiv 02094 Ukraine
| | - Bohdan V. Vashchenko
- Enamine Ltd. Chervonotkatska 78 Kyiv 02094 Ukraine
- Taras Shevchenko National University of Kyiv Volodymyrska Street 60 Kyiv 01601 Ukraine
| |
Collapse
|
40
|
Ono T, Aikawa K, Okazoe T, Morimoto J, Sando S. Methyl to trifluoromethyl substitution as a strategy to increase the membrane permeability of short peptides. Org Biomol Chem 2021; 19:9386-9389. [PMID: 34676842 DOI: 10.1039/d1ob01565f] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Here, we investigated the effect of CH3 to CF3 substitution on the membrane permeability of peptides. We synthesized a series of peptides with CF3 groups and corresponding nonfluorinated peptides and measured the membrane permeability of the peptides. As a result, we demonstrated that CH3 to CF3 substitution is useful for increasing the membrane permeability of di-/tri-peptides.
Collapse
Affiliation(s)
- Takahiro Ono
- Department of Chemistry & Biotechnology, Graduate School of Engineering, The University of Tokyo, Bunkyo-ku, Tokyo 113-8656, Japan.
| | - Kohsuke Aikawa
- Department of Chemistry & Biotechnology, Graduate School of Engineering, The University of Tokyo, Bunkyo-ku, Tokyo 113-8656, Japan.
| | - Takashi Okazoe
- Department of Chemistry & Biotechnology, Graduate School of Engineering, The University of Tokyo, Bunkyo-ku, Tokyo 113-8656, Japan.
- Material Integration Laboratories, Yokohama Technical Center, AGC Inc., Yokohama 230-0045, Japan
| | - Jumpei Morimoto
- Department of Chemistry & Biotechnology, Graduate School of Engineering, The University of Tokyo, Bunkyo-ku, Tokyo 113-8656, Japan.
| | - Shinsuke Sando
- Department of Chemistry & Biotechnology, Graduate School of Engineering, The University of Tokyo, Bunkyo-ku, Tokyo 113-8656, Japan.
- Department of Bioengineering, Graduate School of Engineering, The University of Tokyo, Bunkyo-ku, Tokyo 113-8656, Japan
| |
Collapse
|
41
|
Schiesser S, Hajek P, Pople HE, Käck H, Öster L, Cox RJ. Discovery and optimization of cyclohexane-1,4-diamines as allosteric MALT1 inhibitors. Eur J Med Chem 2021; 227:113925. [PMID: 34742013 DOI: 10.1016/j.ejmech.2021.113925] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2021] [Revised: 10/11/2021] [Accepted: 10/13/2021] [Indexed: 11/19/2022]
Abstract
Inhibition of mucosa-associated lymphoid tissue lymphoma translocation protein-1 (MALT1) is a promising strategy to modulate NF-κB signaling, with the potential to treat B-cell lymphoma and autoimmune diseases. We describe the discovery and optimization of (1s,4s)-N,N'-diaryl cyclohexane-1,4-diamines, a novel series of allosteric MALT1 inhibitors, resulting in compound 8 with single digit micromolar cell potency. X-ray analysis confirms that this compound binds to an induced allosteric site in MALT1. Compound 8 is highly selective and has an excellent in vivo rat PK profile with low clearance and high oral bioavailability, making it a promising lead for further optimization.
Collapse
Affiliation(s)
- Stefan Schiesser
- Department of Medicinal Chemistry, Research and Early Development, Respiratory & Immunology (R&I), BioPharmaceuticals R&D, AstraZeneca, Pepparedsleden 1, 43183, Mölndal, Sweden.
| | - Peter Hajek
- Department of Medicinal Chemistry, Research and Early Development, Respiratory & Immunology (R&I), BioPharmaceuticals R&D, AstraZeneca, Pepparedsleden 1, 43183, Mölndal, Sweden
| | - Huw E Pople
- Department of Medicinal Chemistry, Research and Early Development, Respiratory & Immunology (R&I), BioPharmaceuticals R&D, AstraZeneca, Pepparedsleden 1, 43183, Mölndal, Sweden; School of Chemistry, Cardiff University, Main Building, Park Place, Cardiff, CF10 3AT, United Kingdom
| | - Helena Käck
- Mechanistic and Structural Biology, Discovery Sciences, R&D, AstraZeneca, Pepparedsleden 1, 43183, Mölndal, Sweden
| | - Linda Öster
- Mechanistic and Structural Biology, Discovery Sciences, R&D, AstraZeneca, Pepparedsleden 1, 43183, Mölndal, Sweden
| | - Rhona J Cox
- Department of Medicinal Chemistry, Research and Early Development, Respiratory & Immunology (R&I), BioPharmaceuticals R&D, AstraZeneca, Pepparedsleden 1, 43183, Mölndal, Sweden
| |
Collapse
|
42
|
Cao T, Retailleau P, Milcent T, Crousse B. Synthesis of N-CF 3 hydrazines through radical trifluoromethylation of azodicarboxylates. Chem Commun (Camb) 2021; 57:10351-10354. [PMID: 34533141 DOI: 10.1039/d1cc04538e] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We report here the synthesis of a novel family of N-CF3 hydrazines from a direct way involving the available and cheap Langlois reagent (CF3SO2Na). These derivatives have shown very high stability whatever the conditions used and are excellent precursors for building previously inaccessible N-CF3 functionalized compounds, such as substituted hydrazides, hydrazine-amino-acids, hydrazones, N-aziridines and pyrazoles.
Collapse
Affiliation(s)
- Tingting Cao
- UMR 8076, BioCIS, Univ. Paris-Sud, CNRS, Université Paris-Saclay, 92290 Châtenay-Malabry, France.
| | - Pascal Retailleau
- Université Paris-Saclay, CNRS, Institut de Chimie des Substances Naturelles, 91198 Gif-sur-Yvette, France.
| | - Thierry Milcent
- UMR 8076, BioCIS, Univ. Paris-Sud, CNRS, Université Paris-Saclay, 92290 Châtenay-Malabry, France.
| | - Benoît Crousse
- UMR 8076, BioCIS, Univ. Paris-Sud, CNRS, Université Paris-Saclay, 92290 Châtenay-Malabry, France.
| |
Collapse
|
43
|
|
44
|
Bakhanovich O, Khutorianskyi V, Motornov V, Beier P. Synthesis of N-perfluoroalkyl-3,4-disubstituted pyrroles by rhodium-catalyzed transannulation of N-fluoroalkyl-1,2,3-triazoles with terminal alkynes. Beilstein J Org Chem 2021; 17:504-510. [PMID: 33727973 PMCID: PMC7934709 DOI: 10.3762/bjoc.17.44] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2020] [Accepted: 02/10/2021] [Indexed: 01/10/2023] Open
Abstract
The rhodium-catalyzed transannulation of N-perfluoroalkyl-1,2,3-triazoles with aromatic and aliphatic terminal alkynes under microwave heating conditions afforded N-perfluoroalkyl-3,4-disubstituted pyrroles (major products) and N-fluoroalkyl-2,4-disubstituted pyrroles (minor products). The observed selectivities in the case of the reactions with aliphatic alkynes were high.
Collapse
Affiliation(s)
- Olga Bakhanovich
- Institute of Organic Chemistry and Biochemistry of the Czech Academy of Sciences, Flemingovo náměstí 2, 166 10 Prague 6, Czech Republic.,Department of Organic Chemistry, Faculty of Science, Charles University, Hlavova 2030/8, 128 43 Prague, Czech Republic
| | - Viktor Khutorianskyi
- Institute of Organic Chemistry and Biochemistry of the Czech Academy of Sciences, Flemingovo náměstí 2, 166 10 Prague 6, Czech Republic
| | - Vladimir Motornov
- Institute of Organic Chemistry and Biochemistry of the Czech Academy of Sciences, Flemingovo náměstí 2, 166 10 Prague 6, Czech Republic
| | - Petr Beier
- Institute of Organic Chemistry and Biochemistry of the Czech Academy of Sciences, Flemingovo náměstí 2, 166 10 Prague 6, Czech Republic
| |
Collapse
|