1
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Li Q, Yuan D, Liu C, Herington F, Yang K, Ge H. Selective Oxidation of Benzo[ d]isothiazol-3(2 H)-Ones Enabled by Selectfluor. Molecules 2024; 29:3899. [PMID: 39202979 PMCID: PMC11357611 DOI: 10.3390/molecules29163899] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2024] [Revised: 08/10/2024] [Accepted: 08/16/2024] [Indexed: 09/03/2024] Open
Abstract
A metal-free and Selectfluor-mediated selective oxidation reaction of benzo[d]isothiazol-3(2H)-ones in aqueous media is presented. This novel strategy provides a facile, green, and efficient approach to access important benzo[d]isothiazol-3(2H)-one-1-oxides with excellent yields and high tolerance to various functional groups. Furthermore, the purification of benzoisothiazol-3-one-1-oxides does not rely on column chromatography. Moreover, the preparation of saccharine derivatives has been achieved through sequential, double oxidation reactions in a one-pot aqueous media.
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Affiliation(s)
- Qin Li
- Jiangsu Key Laboratory of Advanced Catalytic Materials & Technology, School of Petrochemical Engineering, Changzhou University, Changzhou 213164, China; (Q.L.); (D.Y.)
| | - Dan Yuan
- Jiangsu Key Laboratory of Advanced Catalytic Materials & Technology, School of Petrochemical Engineering, Changzhou University, Changzhou 213164, China; (Q.L.); (D.Y.)
| | - Chong Liu
- Department of Chemistry and Biochemistry, Texas Tech University, Lubbock, TX 79409, USA; (C.L.); (F.H.)
| | - Faith Herington
- Department of Chemistry and Biochemistry, Texas Tech University, Lubbock, TX 79409, USA; (C.L.); (F.H.)
| | - Ke Yang
- Jiangsu Key Laboratory of Advanced Catalytic Materials & Technology, School of Petrochemical Engineering, Changzhou University, Changzhou 213164, China; (Q.L.); (D.Y.)
| | - Haibo Ge
- Department of Chemistry and Biochemistry, Texas Tech University, Lubbock, TX 79409, USA; (C.L.); (F.H.)
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2
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Dağalan Z, Çelikoğlu MH, Çelik S, Koçak R, Nişancı B. Selectfluor and alcohol-mediated synthesis of bicyclic oxyfluorination compounds by Wagner-Meerwein rearrangement. Beilstein J Org Chem 2024; 20:1462-1467. [PMID: 38978745 PMCID: PMC11228819 DOI: 10.3762/bjoc.20.129] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2024] [Accepted: 06/18/2024] [Indexed: 07/10/2024] Open
Abstract
Herein, we report the first environmentally friendly systematic fluoroalkoxylation reactions in bicyclic systems. New oxyfluorination products were obtained with excellent yields (up to 98%) via Wagner-Meerwein rearrangement using benzonorbornadiene and the chiral natural compound (+)-camphene as bicyclic alkenes, selectfluor as an electrophilic fluorine source, and water and various alcohols as nucleophile sources. The structure of bicyclic oxy- and alkoxyfluorine compounds was determined by NMR and QTOF-MS analyses.
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Affiliation(s)
- Ziya Dağalan
- Department of Chemistry, Faculty of Science, Ataturk University, Erzurum, Turkey
| | | | - Saffet Çelik
- Technology Research and Development Application and Research Center, Trakya University, Edirne, Turkey
| | - Ramazan Koçak
- Department of Chemistry, Faculty of Science, Ataturk University, Erzurum, Turkey
- Department of Chemistry, Faculty of Arts and Sciences, Amasya University, Amasya, Turkey
| | - Bilal Nişancı
- Department of Chemistry, Faculty of Science, Ataturk University, Erzurum, Turkey
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3
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Chakrabarti K, Wade Wolfe MM, Guo S, Tucker JW, Lee J, Szymczak NK. A metal-free strategy to construct fluoroalkyl-olefin linkages using fluoroalkanes. Chem Sci 2024; 15:1752-1757. [PMID: 38303957 PMCID: PMC10829021 DOI: 10.1039/d3sc05616c] [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: 10/21/2023] [Accepted: 12/21/2023] [Indexed: 02/03/2024] Open
Abstract
We present a metal-free strategy to access fluoroalkyl-olefin linkages from fluoroalkane precursors and vinyl-pinacol boronic ester (BPin) reagents. This reaction sequence is templated by the boron reagent, which induces C-C bond formation upon oxidation. We developed this strategy into a one-pot synthetic protocol using RCF2H precursors directly with vinyl-BPin reagents in the presence of a Brønsted base, which tolerated oxygen- and nitrogen-containing heterocycles, and aryl halogens. We also found that HCF3 (HCF-23; a byproduct of the Teflon industry) and CH2F2 (HCF-32; a low-cost refrigerant) are amenable to this protocol, representing distinct strategies to generate RCF2H and RCF3 molecules. Finally, we demonstrate that the vinyldifluoromethylene products can be readily derivatized, representing an avenue for late-stage modification after installing the fluoroalkyl unit.
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Affiliation(s)
- Kaushik Chakrabarti
- Department of Chemistry, University of Michigan, 930 N. University Ann Arbor Michigan 48109 USA
| | - Michael M Wade Wolfe
- Department of Chemistry, University of Michigan, 930 N. University Ann Arbor Michigan 48109 USA
| | - Shuo Guo
- College of Chemistry and Chemical Engineering, Inner Mongolia University Hohhot 010021 P.R. China
| | - Joseph W Tucker
- Medicine Design, Pfizer Inc. Eastern Point Rd Groton CT 06340 USA
| | - Jisun Lee
- Medicine Design, Pfizer Inc. Eastern Point Rd Groton CT 06340 USA
| | - Nathaniel K Szymczak
- Department of Chemistry, University of Michigan, 930 N. University Ann Arbor Michigan 48109 USA
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4
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Ajitha M, Haines BE, Musaev DG. Mechanism and Selectivity of Copper-Catalyzed Bromination of Distal C(sp 3)-H Bonds. Organometallics 2023; 42:2467-2476. [PMID: 37772274 PMCID: PMC10526628 DOI: 10.1021/acs.organomet.2c00554] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2022] [Indexed: 02/25/2023]
Abstract
Unactivated C(sp3)-H bonds are the most challenging substrate class for transition metal-catalyzed C-H halogenation. Recently, the Yu group [Liu, T.; Myers, M. C.; Yu, J. Q. Angew. Chem., Int. Ed.2017, 56 (1), 306-309] has demonstrated that a CuII/phenanthroline catalyst and BrN3, generated in situ from NBS and TMSN3 precursors, can achieve selective C-H bromination distal to a directing group. The current understanding of the mechanism of this reaction has left numerous questions unanswered. Here, we investigated the mechanism of Cu-catalyzed C(sp3)-H bromination with distal site selectivity using density functional theory calculations. We found that this reaction starts with the Br-atom transfer from BrN3 to the Cu center that occurs via a small energy barrier at the singlet-triplet state seam of crossing. In the course of this reaction, the presence of the N-H bond in the substrate is critically important and acts as a directing group for enhancing the stability of the catalyst-substrate interaction and for the recruitment of the substrate to the catalyst. The required C-centered radical substrate formation occurs via direct C-H dehydrogenation by the Cu-coordinated N3 radical, rather than via the previously proposed N-H bond dehydrogenation and then the 1,5-H transfer from the γ-(C-H) bond to the N-radical center pathway. The C-H bond activation by the azide radical is a regioselectivity-controlling step. The following bromination of the C-centered radical by the Cu-coordinated bromine completes the product formation. This reaction step is the rate-limiting step, occurs at the singlet-to-triplet state seam of the crossing point, and is exergonic.
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Affiliation(s)
- Manjaly
J. Ajitha
- Cherry L. Emerson Center for Scientific
Computation, Emory University, 1515 Dickey Drive, Atlanta, Georgia 30322, United States
| | | | - Djamaladdin G. Musaev
- Cherry L. Emerson Center for Scientific
Computation, Emory University, 1515 Dickey Drive, Atlanta, Georgia 30322, United States
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5
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Padilla-Pérez MC, Sánchez-Fernández EM, González-Bakker A, Puerta A, Padrón JM, Martín-Loro F, Arroba AI, García Fernández JM, Mellet CO. Fluoro-labelled sp 2-iminoglycolipids with immunomodulatory properties. Eur J Med Chem 2023; 255:115390. [PMID: 37137247 DOI: 10.1016/j.ejmech.2023.115390] [Citation(s) in RCA: 6] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2023] [Revised: 04/14/2023] [Accepted: 04/17/2023] [Indexed: 05/05/2023]
Abstract
The unique electronic properties of the fluorine atom make its strategic incorporation into a bioactive compound a very useful tool in the design of drugs with optimized pharmacological properties. In the field of the carbohydrates, its selective installation at C2 position has proven particularly interesting, some 2-deoxy-2-fluorosugar derivatives being currently in the market. We have now transferred this feature into immunoregulatory glycolipid mimetics that contain a sp2-iminosugar moiety, namely sp2-iminoglycolipids (sp2-IGLs). The synthesis of two epimeric series of 2-deoxy-2-fluoro-sp2-IGLs, structurally related to nojirimycin and mannonojirimycin, has been accomplished by sequential Selectfluor-mediated fluorination and thioglycosidation of sp2-iminoglycals. Exclusively the α-anomer is obtained regardless of the configurational profile of the sp2-IGL (d-gluco or d-manno), highlighting the overwhelming anomeric effect in these prototypes. Notably, the combination of a fluorine atom at C2 and an α-oriented sulfonyl dodecyl lipid moiety in compound 11 led to remarkable anti-proliferative properties, featuring similar GI50 values than the chemotherapy drug Cisplatin against several tumor cell lines and better selectivity. The biochemical data further evidence a strong reduction of the number of tumor cell colonies and apoptosis induction. Mechanistic investigations revealed that this fluoro-sp2-IGL induces the non-canonical activation mode of the mitogen-activated protein kinase signaling pathway, causing p38α autoactivation under an inflammatory context.
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Affiliation(s)
- M Carmen Padilla-Pérez
- Department of Organic Chemistry, Faculty of Chemistry, University of Sevilla, C/ Profesor García González 1, 41012, Sevilla, Spain
| | - Elena M Sánchez-Fernández
- Department of Organic Chemistry, Faculty of Chemistry, University of Sevilla, C/ Profesor García González 1, 41012, Sevilla, Spain.
| | - Aday González-Bakker
- BioLab, Instituto Universitario de Bio-Orgánica "Antonio González", Universidad de la Laguna, C/ Astrofísico Francisco Sánchez 2, 38206, La Laguna, Spain
| | - Adrián Puerta
- BioLab, Instituto Universitario de Bio-Orgánica "Antonio González", Universidad de la Laguna, C/ Astrofísico Francisco Sánchez 2, 38206, La Laguna, Spain
| | - José M Padrón
- BioLab, Instituto Universitario de Bio-Orgánica "Antonio González", Universidad de la Laguna, C/ Astrofísico Francisco Sánchez 2, 38206, La Laguna, Spain.
| | - Francisco Martín-Loro
- Biomedical Research and Innovation Institute of Cádiz (INiBICA) Research Unit, Puerta del Mar University Hospital, Av/ Ana de Viya 21, 11009, Cádiz, Spain
| | - Ana I Arroba
- Biomedical Research and Innovation Institute of Cádiz (INiBICA) Research Unit, Puerta del Mar University Hospital, Av/ Ana de Viya 21, 11009, Cádiz, Spain; Department of Biomedicine, Biotechnology and Public Health Immunology Area, University of Cádiz Pl. Falla, 9, 11003, Cádiz, Spain
| | - José Manuel García Fernández
- Instituto de Investigaciones Químicas (IIQ), CSIC - Universidad de Sevilla, C/ Américo Vespucio 49, Isla de la Cartuja, 41092, Sevilla, Spain
| | - Carmen Ortiz Mellet
- Department of Organic Chemistry, Faculty of Chemistry, University of Sevilla, C/ Profesor García González 1, 41012, Sevilla, Spain
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6
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Yakubov S, Stockerl WJ, Tian X, Shahin A, Mandigma MJP, Gschwind RM, Barham JP. Benzoates as photosensitization catalysts and auxiliaries in efficient, practical, light-powered direct C(sp 3)-H fluorinations. Chem Sci 2022; 13:14041-14051. [PMID: 36540818 PMCID: PMC9728569 DOI: 10.1039/d2sc05735b] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2022] [Accepted: 10/28/2022] [Indexed: 12/14/2023] Open
Abstract
Of the methods for direct fluorination of unactivated C(sp3)-H bonds, photosensitization of SelectFluor is a promising approach. Although many substrates can be activated with photosensitizing catalysts, issues remain that hamper fluorination of complex molecules. Alcohol- or amine-containing functional groups are not tolerated, fluorination regioselectivity follows factors endogenous to the substrate and cannot be influenced by the catalyst, and reactions are highly air-sensitive. We report that benzoyl groups serve as highly efficient photosensitizers which, in combination with SelectFluor, enable visible light-powered direct fluorination of unactivated C(sp3)-H bonds. Compared to previous photosensitizer architectures, the benzoyls have versatility to function both (i) as a photosensitizing catalyst for simple substrate fluorinations and (ii) as photosensitizing auxiliaries for complex molecule fluorinations that are easily installed and removed without compromising yield. Our auxiliary approach (i) substantially decreases the reaction's induction period, (ii) enables C(sp3)-H fluorination of many substrates that fail under catalytic conditions, (iii) increases kinetic reproducibility, and (iv) promotes reactions to higher yields, in shorter times, on multigram scales, and even under air. Observations and mechanistic studies suggest an intimate 'assembly' of auxiliary and SelectFluor prior/after photoexcitation. The auxiliary allows other EnT photochemistry under air. Examples show how auxiliary placement proximally directs regioselectivity, where previous methods are substrate-directed.
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Affiliation(s)
- Shahboz Yakubov
- Fakultät für Chemie und Pharmazie, Universität Regensburg 93040 Regensburg Germany
| | - Willibald J Stockerl
- Fakultät für Chemie und Pharmazie, Universität Regensburg 93040 Regensburg Germany
| | - Xianhai Tian
- Fakultät für Chemie und Pharmazie, Universität Regensburg 93040 Regensburg Germany
| | - Ahmed Shahin
- Fakultät für Chemie und Pharmazie, Universität Regensburg 93040 Regensburg Germany
- Chemistry Department, Faculty of Science, Benha University 13518 Benha Egypt
| | - Mark John P Mandigma
- Fakultät für Chemie und Pharmazie, Universität Regensburg 93040 Regensburg Germany
| | - Ruth M Gschwind
- Fakultät für Chemie und Pharmazie, Universität Regensburg 93040 Regensburg Germany
| | - Joshua P Barham
- Fakultät für Chemie und Pharmazie, Universität Regensburg 93040 Regensburg Germany
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7
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Abstract
Fluorinated carbohydrates have found many applications in the glycosciences. Typically, these contain fluorination at a single position. There are not many applications involving polyfluorinated carbohydrates, here defined as monosaccharides in which more than one carbon has at least one fluorine substituent directly attached to it, with the notable exception of their use as mechanism-based inhibitors. The increasing attention to carbohydrate physical properties, especially around lipophilicity, has resulted in a surge of interest for this class of compounds. This review covers the considerable body of work toward the synthesis of polyfluorinated hexoses, pentoses, ketosugars, and aminosugars including sialic acids and nucleosides. An overview of the current state of the art of their glycosidation is also provided.
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Affiliation(s)
- Kler Huonnic
- School
of Chemistry, University of Southampton, Highfield, Southampton, SO17 1BJ, U.K.
| | - Bruno Linclau
- School
of Chemistry, University of Southampton, Highfield, Southampton, SO17 1BJ, U.K.
- Department
of Organic and Macromolecular Chemistry, Ghent University, Campus Sterre, Krijgslaan 281-S4, Ghent, 9000, Belgium
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8
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Zhang W, Sun M, You K, Pang Y, Ma B. Metal-free aminofluorination of α-diazo 2 H-benzopyran-4-one: convenient access to β-fluoramides. Org Biomol Chem 2022; 20:7027-7030. [PMID: 36017814 DOI: 10.1039/d2ob01089e] [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
We have developed a convenient synthesis of a series of β-fluoramides in 65% yield. The process involved a tandem fluorination/Ritter reaction to synthesize β-fluoramides using α-diazo 2H-benzopyran-4-one compounds. Selectfluor was used as the electrophilic fluoride source in acetonitrile to build the β-fluorinated quaternary carbon center and amide derivatives of 2H-benzopyran-4-one in one step. The products N-(2-(2-fluoro-2,3-dihydro-3-oxobenzofuran-2-yl)propan-2-yl)acetamides were a series of bifunctional compounds with a 2-fluoro-2,3-dihydro-3-oxobenzofuran motif and amide groups.
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Affiliation(s)
- Wentao Zhang
- State Key Laboratory of Applied Organic Chemistry, Lanzhou University, Lanzhou 730000, China. .,Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou 730000, China
| | - Minghao Sun
- State Key Laboratory of Applied Organic Chemistry, Lanzhou University, Lanzhou 730000, China.
| | - Kejia You
- State Key Laboratory of Applied Organic Chemistry, Lanzhou University, Lanzhou 730000, China.
| | - Yunfei Pang
- State Key Laboratory of Applied Organic Chemistry, Lanzhou University, Lanzhou 730000, China.
| | - Baochun Ma
- State Key Laboratory of Applied Organic Chemistry, Lanzhou University, Lanzhou 730000, China.
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9
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Selectfluor Mediated Difunctionalization of Olefins towards the Synthesis of Fluoromethylated Morpholines. European J Org Chem 2022. [DOI: 10.1002/ejoc.202101543] [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]
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10
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Computational Study of Key Mechanistic Details for a Proposed Copper (I)-Mediated Deconstructive Fluorination of N-Protected Cyclic Amines. Top Catal 2022; 65:418-432. [PMID: 35197715 DOI: 10.1007/s11244-021-01443-y] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
Using calculations, we show that a proposed Cu(I)-mediated deconstructive fluorination of N-benzoylated cyclic amines with Selectfluor® is feasible and may proceed through: (a) substrate coordination to a Cu(I) salt, (b) iminium ion formation followed by conversion to a hemiaminal, and (c) fluorination involving C-C cleavage of the hemiaminal. The iminium ion formation is calculated to proceed via a F-atom coupled electron transfer (FCET) mechanism to form, formally, a product arising from oxidative addition coupled with electron transfer (OA + ET). The subsequent β-C-C cleavage/fluorination of the hemiaminal intermediate may proceed via either ring-opening or deformylative fluorination pathways. The latter pathway is initiated by opening of the hemiaminal to give an aldehyde, followed by formyl H-atom abstraction by a TEDA2+ radical dication, decarbonylation, and fluorination of the C3-radical center by another equivalent of Selectfluor®. In general, the mechanism for the proposed Cu(I)- mediated deconstructive C-H fluorination of N-benzoylated cyclic amines (LH) by Selectfluor® was calculated to proceed analogously to our previously reported Ag(I)-mediated reaction. In comparison to the Ag(I)-mediated process, in the Cu(I)-mediated reaction the iminium ion formation and hemiaminal fluorination have lower associated energy barriers, whereas the product release and catalyst re-generation steps have higher barriers.
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11
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Zhang M, Chen HW, Liu QQ, Gao FT, Li YX, Hu XG, Yu CY. De Novo Synthesis of Orthogonally-Protected C2-Fluoro Digitoxoses and Cymaroses: Development and Application for the Synthesis of Fluorinated Digoxin. J Org Chem 2021; 87:1272-1284. [PMID: 34964642 DOI: 10.1021/acs.joc.1c02592] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
Inspired by Roush's pioneering work on rare sugars, we have developed a scalable, stereoselective, de novo synthesis of orthogonally protected C2-fluoro digitoxose and cymarose, utilizing Sharpless kinetic resolution and organocatalytic fluorination as key steps. The utility of this strategy is demonstrated by the synthesis of a fluorinated analogue of digoxin, which indicates the fluorine on the sugar ring may have a significant impact on biological activity.
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Affiliation(s)
- Ming Zhang
- National Engineering Research Center for Carbohydrate Synthesis, Jiangxi Normal University, Nanchang 330022, China.,Beijing National Laboratory for Molecular Science (BNLMS), CAS Key Laboratory of Molecular Recognition and Function, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
| | - Hong-Wei Chen
- National Engineering Research Center for Carbohydrate Synthesis, Jiangxi Normal University, Nanchang 330022, China
| | - Qing-Quan Liu
- National Engineering Research Center for Carbohydrate Synthesis, Jiangxi Normal University, Nanchang 330022, China
| | - Feng-Teng Gao
- National Engineering Research Center for Carbohydrate Synthesis, Jiangxi Normal University, Nanchang 330022, China
| | - Yi-Xian Li
- Beijing National Laboratory for Molecular Science (BNLMS), CAS Key Laboratory of Molecular Recognition and Function, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
| | - Xiang-Guo Hu
- National Engineering Research Center for Carbohydrate Synthesis, Jiangxi Normal University, Nanchang 330022, China
| | - Chu-Yi Yu
- Beijing National Laboratory for Molecular Science (BNLMS), CAS Key Laboratory of Molecular Recognition and Function, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
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12
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Pandey S, Nagpal R, Thakur A, Bari SS, Thapar R. A highly stereoselective oxidation and an easy one pot elimination methodology for 3-allyl-3-phenylthio-β-lactams. J Sulphur Chem 2021. [DOI: 10.1080/17415993.2021.2010734] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Affiliation(s)
- Suvidha Pandey
- Department of Chemistry, Panjab University, Chandigarh, India
| | | | - Aarti Thakur
- Department of Chemistry, Panjab University, Chandigarh, India
- University Institute of Engineering and Technology, Panjab University, Chandigarh, India
| | | | - Renu Thapar
- University Institute of Engineering and Technology, Panjab University, Chandigarh, India
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13
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Wang T, Phillips EM, Dalby SM, Sirota E, Axnanda S, Shultz CS, Patel P, Waldman JH, Alwedi E, Wang X, Zawatzky K, Chow M, Padivitage N, Weisel M, Whittington M, Duan J, Lu T. Manufacturing Process Development for Belzutifan, Part 5: A Streamlined Fluorination–Dynamic Kinetic Resolution Process. Org Process Res Dev 2021. [DOI: 10.1021/acs.oprd.1c00242] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Affiliation(s)
- Tao Wang
- Process Research and Development, Merck & Co., Inc., Rahway, New Jersey 07065, United States
| | - Eric M. Phillips
- Process Research and Development, Merck & Co., Inc., Rahway, New Jersey 07065, United States
| | - Stephen M. Dalby
- Process Research and Development, Merck & Co., Inc., Rahway, New Jersey 07065, United States
| | - Eric Sirota
- Process Research and Development, Merck & Co., Inc., Rahway, New Jersey 07065, United States
| | - Stephanus Axnanda
- Analytical Research and Development, Merck & Co., Inc., Rahway, New Jersey 07065, United States
| | - C. Scott Shultz
- Analytical Research and Development, Merck & Co., Inc., Rahway, New Jersey 07065, United States
| | - Pratiq Patel
- Chemical Commercialization Technology, Merck & Co., Inc., Rahway, New Jersey 07065, United States
| | - Jacob H. Waldman
- Chemical Commercialization Technology, Merck & Co., Inc., Rahway, New Jersey 07065, United States
| | - Embarek Alwedi
- Process Research and Development, Merck & Co., Inc., Rahway, New Jersey 07065, United States
| | - Xiao Wang
- Analytical Research and Development, Merck & Co., Inc., Rahway, New Jersey 07065, United States
| | - Kerstin Zawatzky
- Analytical Research and Development, Merck & Co., Inc., Rahway, New Jersey 07065, United States
| | - Matthew Chow
- Analytical Research and Development, Merck & Co., Inc., Rahway, New Jersey 07065, United States
| | - Nilusha Padivitage
- Analytical Research and Development, Merck & Co., Inc., Rahway, New Jersey 07065, United States
| | - Mark Weisel
- Process Research and Development, Merck & Co., Inc., Rahway, New Jersey 07065, United States
| | - Michael Whittington
- Process Research and Development, Merck & Co., Inc., Rahway, New Jersey 07065, United States
| | - Jianjun Duan
- Shanghai SynTheAll Pharmaceutical Co. Ltd., 9 Yuegong Road, Jinshan District, Shanghai 201507, China
| | - Taotao Lu
- Shanghai SynTheAll Pharmaceutical Co. Ltd., 9 Yuegong Road, Jinshan District, Shanghai 201507, China
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14
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Wang J, Liu M, Zhang Y, Bi G, Zhao Y, Yang K, Huang X. Switchable Synthesis of Sulfoxides and α-Alkoxy-β-ketothioethers Regulated by Temperature in a Selectfluor-Methanol System. J Org Chem 2021; 86:14404-14419. [PMID: 34643084 DOI: 10.1021/acs.joc.1c01146] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
A switchable and benign protocol for chemoselective synthesis of sulfoxides and α-alkoxy-β-ketothioethers has been developed. It was determined that various thiophenols and alkenes/alkynes are compatible to realize the target compounds from a medium to a high yield by regulating the reaction temperature. In particular, methanol not only served as a solvent but also participated in the reaction process as a hydrogen donor. In this study, Selectfluor has been proved to be an efficient multifunctional reagent in the reaction system.
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Affiliation(s)
- Jiateng Wang
- School of Chemistry and Chemical Engineering, Shandong University of Technology, Zibo 255049, Shandong, P. R. China
| | - Mengxia Liu
- School of Chemistry and Chemical Engineering, Shandong University of Technology, Zibo 255049, Shandong, P. R. China
| | - Yue Zhang
- School of Chemistry and Chemical Engineering, Shandong University of Technology, Zibo 255049, Shandong, P. R. China
| | - Gehua Bi
- School of Chemistry and Chemical Engineering, Shandong University of Technology, Zibo 255049, Shandong, P. R. China
| | - Yi Zhao
- School of Chemistry and Chemical Engineering, Shandong University of Technology, Zibo 255049, Shandong, P. R. China
| | - Kai Yang
- School of Chemistry and Chemical Engineering, Shandong University of Technology, Zibo 255049, Shandong, P. R. China
| | - Xin Huang
- School of Chemistry and Chemical Engineering, Shandong University of Technology, Zibo 255049, Shandong, P. R. China
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15
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Jain N, Tamura K, Déjean G, Van Petegem F, Brumer H. Orthogonal Active-Site Labels for Mixed-Linkage endo-β-Glucanases. ACS Chem Biol 2021; 16:1968-1984. [PMID: 33988963 DOI: 10.1021/acschembio.1c00063] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Small molecule irreversible inhibitors are valuable tools for determining catalytically important active-site residues and revealing key details of the specificity, structure, and function of glycoside hydrolases (GHs). β-glucans that contain backbone β(1,3) linkages are widespread in nature, e.g., mixed-linkage β(1,3)/β(1,4)-glucans in the cell walls of higher plants and β(1,3)glucans in yeasts and algae. Commensurate with this ubiquity, a large diversity of mixed-linkage endoglucanases (MLGases, EC 3.2.1.73) and endo-β(1,3)-glucanases (laminarinases, EC 3.2.1.39 and EC 3.2.1.6) have evolved to specifically hydrolyze these polysaccharides, respectively, in environmental niches including the human gut. To facilitate biochemical and structural analysis of these GHs, with a focus on MLGases, we present here the facile chemo-enzymatic synthesis of a library of active-site-directed enzyme inhibitors based on mixed-linkage oligosaccharide scaffolds and N-bromoacetylglycosylamine or 2-fluoro-2-deoxyglycoside warheads. The effectiveness and irreversibility of these inhibitors were tested with exemplar MLGases and an endo-β(1,3)-glucanase. Notably, determination of inhibitor-bound crystal structures of a human-gut microbial MLGase from Glycoside Hydrolase Family 16 revealed the orthogonal labeling of the nucleophile and catalytic acid/base residues with homologous 2-fluoro-2-deoxyglycoside and N-bromoacetylglycosylamine inhibitors, respectively. We anticipate that the selectivity of these inhibitors will continue to enable the structural and mechanistic analyses of β-glucanases from diverse sources and protein families.
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Affiliation(s)
- Namrata Jain
- Michael Smith Laboratories, University of British Columbia, 2185 East Mall, Vancouver, British Columbia V6T 1Z4, Canada
- Department of Chemistry, University of British Columbia, 2036 Main Mall, Vancouver, British Columbia V6T 1Z1, Canada
| | - Kazune Tamura
- Michael Smith Laboratories, University of British Columbia, 2185 East Mall, Vancouver, British Columbia V6T 1Z4, Canada
- Department of Biochemistry and Molecular Biology, University of British Columbia, 2350 Health Sciences Mall, Vancouver, British Columbia V6T 1Z3, Canada
| | - Guillaume Déjean
- Michael Smith Laboratories, University of British Columbia, 2185 East Mall, Vancouver, British Columbia V6T 1Z4, Canada
| | - Filip Van Petegem
- Department of Biochemistry and Molecular Biology, University of British Columbia, 2350 Health Sciences Mall, Vancouver, British Columbia V6T 1Z3, Canada
| | - Harry Brumer
- Michael Smith Laboratories, University of British Columbia, 2185 East Mall, Vancouver, British Columbia V6T 1Z4, Canada
- Department of Chemistry, University of British Columbia, 2036 Main Mall, Vancouver, British Columbia V6T 1Z1, Canada
- Department of Biochemistry and Molecular Biology, University of British Columbia, 2350 Health Sciences Mall, Vancouver, British Columbia V6T 1Z3, Canada
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16
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Lubriks D, Zogota R, Sarpe VA, Matsushita T, Sati GC, Haldimann K, Gysin M, Böttger EC, Vasella A, Suna E, Hobbie SN, Crich D. Synthesis and Antibacterial Activity of Propylamycin Derivatives Functionalized at the 5''- and Other Positions with a View to Overcoming Resistance Due to Aminoglycoside Modifying Enzymes. ACS Infect Dis 2021; 7:2413-2424. [PMID: 34114793 DOI: 10.1021/acsinfecdis.1c00158] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
Propylamycin (4'-deoxy-4'-propylparomomycin) is a next generation aminoglycoside antibiotic that displays increased antibacterial potency over the parent, coupled with reduced susceptibility to resistance determinants and reduced ototoxicity in the guinea pig model. Propylamycin nevertheless is inactivated by APH(3')-Ia, a specific aminoglycoside phosphotransferase isozyme that acts on the primary hydroxy group of the ribofuranosyl moiety (at the 5''-position). To overcome this problem, we have prepared and studied the antibacterial and antiribosomal activity of various propylamycin derivatives carrying amino or substituted amino groups at the 5''-position in place of the vulnerable hydroxy group. We find that the introduction of an additional basic amino group at this position, while overcoming the action of the aminoglycoside phosphoryltransferase isozymes acting at the 5''-position as anticipated, results in a significant drop in selectivity for the bacterial over the eukaryotic ribosomes that is predictive of increased ototoxicity. In contrast, 5''-deoxy-5''-formamidopropylamycin retains the excellent across-the-board levels of antibacterial activity of propylamycin itself, while circumventing the action of the offending aminoglycoside phosphotransferase isozymes and affording even greater selectivity for the bacterial over the eukaryotic ribosomes. Other modifications to address the susceptibility of propylamycin to the APH(3')-Ia isozyme including deoxygenation at the 3'-position and incorporation of a 6',5''-bis(hydroxyethylamino) modification offer no particular advantage.
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Affiliation(s)
| | - Rimants Zogota
- Latvian Institute of Organic Synthesis, Riga, Latvia LV-1006
| | - Vikram A. Sarpe
- Department of Pharmaceutical and Biomedical Sciences, University of Georgia, 250 West Green Street, Athens, Georgia 30602, United States
- Complex Carbohydrate Research Center, University of Georgia, 315 Riverbend Road, Athens, Georgia 30602, United States
| | - Takahiko Matsushita
- Department of Chemistry, Wayne State University, 5101 Cass Avenue, Detroit, Michigan 48202, United States
| | - Girish C. Sati
- Department of Chemistry, Wayne State University, 5101 Cass Avenue, Detroit, Michigan 48202, United States
| | - Klara Haldimann
- Institute of Medical Microbiology, University of Zurich, Gloriastrasse 28, 8006 Zürich, Switzerland
| | - Marina Gysin
- Institute of Medical Microbiology, University of Zurich, Gloriastrasse 28, 8006 Zürich, Switzerland
| | - Erik C. Böttger
- Institute of Medical Microbiology, University of Zurich, Gloriastrasse 28, 8006 Zürich, Switzerland
| | - Andrea Vasella
- Organic Chemistry Laboratory, ETH Zürich, Vladimir-Prelog-Weg 1-5/10, 8093 Zürich, Switzerland
| | - Edgars Suna
- Latvian Institute of Organic Synthesis, Riga, Latvia LV-1006
| | - Sven N. Hobbie
- Institute of Medical Microbiology, University of Zurich, Gloriastrasse 28, 8006 Zürich, Switzerland
| | - David Crich
- Department of Pharmaceutical and Biomedical Sciences, University of Georgia, 250 West Green Street, Athens, Georgia 30602, United States
- Complex Carbohydrate Research Center, University of Georgia, 315 Riverbend Road, Athens, Georgia 30602, United States
- Department of Chemistry, Wayne State University, 5101 Cass Avenue, Detroit, Michigan 48202, United States
- Department of Chemistry, University of Georgia, 140 Cedar Street, Athens, Georgia 30602, United States
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17
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Umemoto T, Yang Y, Hammond GB. Development of N-F fluorinating agents and their fluorinations: Historical perspective. Beilstein J Org Chem 2021; 17:1752-1813. [PMID: 34386101 PMCID: PMC8329385 DOI: 10.3762/bjoc.17.123] [Citation(s) in RCA: 24] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2021] [Accepted: 07/06/2021] [Indexed: 12/12/2022] Open
Abstract
This review deals with the historical development of all N-F fluorinating agents developed so far. The unique properties of fluorine make fluorinated organic compounds attractive in many research areas and therefore fluorinating agents are important. N-F agents have proven useful by virtue of their easy handling. This reagent class includes many types of N-F compounds: perfluoro-N-fluoropiperidine, N-fluoro-2-pyridone, N-fluoro-N-alkylarenesulfonamides, N-fluoropyridinium salts and derivatives, N-fluoroquinuclidium salts, N-fluoro-trifluoromethanesulfonimide, N-fluoro-sultams, N-fluoro-benzothiazole dioxides, N-fluoro-lactams, N-fluoro-o-benzenedisulfonimide, N-fluoro-benzenesulfonimide, 1-alkyl-4-fluoro-1,4-diazoniabicyclo[2.2.2]octane salts, N-fluoropyridinium-2-sulfonate derivatives, 1-fluoro-4-hydroxy-1,4-diazoniabicyclo[2.2.2]octane salts, N-fluorodinitroimidazole, N-fluoro-trichloro-1,3,5-triazinium salt, N-F ethano-Tröger’s base derivatives, N-fluoro-methanesulfonimide, N-fluoro-N-arylarenesulfonamides, bisN-F salts such as N,N’-difluorobipyridinium salts and N,N’-difluoro-1,4-diazoniabicyclo[2.2.2]octane salts, and their many derivatives and analogs, including chiral N-F reagents such as optically active N-fluoro-sultam derivatives, N-fluoro-alkaloid derivatives, DABCO-based N-F derivatives, and N-F binaphthyldisulfonimides. The synthesis and reactions of these reagents are described chronologically and the review also discusses the relative fluorination power of each reagent and their mechanisms chronicling developments from a historical perspective.
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Affiliation(s)
- Teruo Umemoto
- Department Chemistry, University of Louisville, Lousiville, Kentucky 40292, USA
| | - Yuhao Yang
- Department Chemistry, University of Louisville, Lousiville, Kentucky 40292, USA
| | - Gerald B Hammond
- Department Chemistry, University of Louisville, Lousiville, Kentucky 40292, USA
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18
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Li Y, Hu Q, Zhang F, Li Z, Sun X, Yang K. Metal‐Free Selective C−S Bond Cleavage of Thioethers to Access β‐Alkoxy Carbonyl Compounds. ChemistrySelect 2021. [DOI: 10.1002/slct.202101925] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Yi Li
- Jiangsu Key Laboratory of Advanced Catalytic Materials & Technology School of Petrochemical Engineering Changzhou University 1 Gehu Road Changzhou Jiangsu 213164 China
| | - Qingyue Hu
- Jiangsu Key Laboratory of Advanced Catalytic Materials & Technology School of Petrochemical Engineering Changzhou University 1 Gehu Road Changzhou Jiangsu 213164 China
| | - Feiyang Zhang
- Jiangsu Key Laboratory of Advanced Catalytic Materials & Technology School of Petrochemical Engineering Changzhou University 1 Gehu Road Changzhou Jiangsu 213164 China
| | - Zhengyi Li
- Jiangsu Key Laboratory of Advanced Catalytic Materials & Technology School of Petrochemical Engineering Changzhou University 1 Gehu Road Changzhou Jiangsu 213164 China
| | - Xiaoqiang Sun
- Jiangsu Key Laboratory of Advanced Catalytic Materials & Technology School of Petrochemical Engineering Changzhou University 1 Gehu Road Changzhou Jiangsu 213164 China
| | - Ke Yang
- Jiangsu Key Laboratory of Advanced Catalytic Materials & Technology School of Petrochemical Engineering Changzhou University 1 Gehu Road Changzhou Jiangsu 213164 China
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19
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Shang W, Zhu C, Peng F, Pan Z, Ding Y, Xia C. Nitrogen-Centered Radical-Mediated Cascade Amidoglycosylation of Glycals. Org Lett 2021; 23:1222-1227. [PMID: 33560134 DOI: 10.1021/acs.orglett.0c04178] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A nitrogen-centered radical-mediated strategy for preparing 1,2-trans-2-amino-2-deoxyglycosides in one step was established. The cascade amidoglycosylation was initiated by a benzenesulfonimide radical generated from NFSI under the catalytic reduction of TEMPO. The benzenesulfonimide radical was electrophilically added to the glycals, and then the resulting glycosidic radical was converted to oxocarbenium upon oxidation by TEMPO+, which enabled the following anomeric specific glycosylation.
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Affiliation(s)
- Wenbin Shang
- Key Laboratory of Medicinal Chemistry for Natural Resource, Ministry of Education, Yunnan Research & Development Center for Natural Products, School of Chemical Science and Technology, Yunnan University, Kunming 650091, China
| | - Chunyu Zhu
- Key Laboratory of Medicinal Chemistry for Natural Resource, Ministry of Education, Yunnan Research & Development Center for Natural Products, School of Chemical Science and Technology, Yunnan University, Kunming 650091, China
| | - Fengyuan Peng
- Key Laboratory of Medicinal Chemistry for Natural Resource, Ministry of Education, Yunnan Research & Development Center for Natural Products, School of Chemical Science and Technology, Yunnan University, Kunming 650091, China
| | - Zhiqiang Pan
- Key Laboratory of Medicinal Chemistry for Natural Resource, Ministry of Education, Yunnan Research & Development Center for Natural Products, School of Chemical Science and Technology, Yunnan University, Kunming 650091, China
| | - Yuzhen Ding
- Key Laboratory of Medicinal Chemistry for Natural Resource, Ministry of Education, Yunnan Research & Development Center for Natural Products, School of Chemical Science and Technology, Yunnan University, Kunming 650091, China
| | - Chengfeng Xia
- Key Laboratory of Medicinal Chemistry for Natural Resource, Ministry of Education, Yunnan Research & Development Center for Natural Products, School of Chemical Science and Technology, Yunnan University, Kunming 650091, China
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20
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DeMent PM, Liu C, Wakpal J, Schaugaard RN, Schlegel HB, Nguyen HM. Phenanthroline-Catalyzed Stereoselective Formation of α-1,2- cis 2-Deoxy-2-Fluoro Glycosides. ACS Catal 2021; 11:2108-2120. [PMID: 34336371 DOI: 10.1021/acscatal.0c04381] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Phenanthroline is a heterocyclic aromatic organic compound and commonly used in coordination chemistry acting as a bidentate ligand. The C4 and C7 positions of phenanthroline can often be substituted to change the binding capabilities of the ligand. Recently, there has been a push in the field of chemistry to create environmental-friendly chemical methodologies by utilizing catalysts and minimizing solvent. Herein, we have illustrated how, at high concentrations with minimal use of solvent, the C4 and C7 positions of phenanthroline can be tuned to develop an efficient and stereoselective catalyst for the formation of α-1,2-cis-fluorinated glycosides. By activating 2-deoxy-2-fluoro glycosyl halides with phenanthroline-based catalysts, we have been able to achieve glycosylations with high levels of α-selectivities and moderate to high yields. The catalytic system has been applied to several glycosyl halide electrophiles with a range of glycosyl nucleophilic acceptors. The proposed mechanism for this catalytic glycosylation system has been investigated by density functional theory calculations, indicating that the double SN2 displacement pathways with phenanthroline catalysts have lower barriers and ensure stereoselective formation of α-1,2-cis-2-fluoro glycosides.
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Affiliation(s)
- Paul M. DeMent
- Department of Chemistry, Wayne State University, Detroit, Michigan 48202, United States
| | - Chenlu Liu
- Department of Chemistry, Wayne State University, Detroit, Michigan 48202, United States
| | - Joseph Wakpal
- Department of Chemistry, Wayne State University, Detroit, Michigan 48202, United States
| | - Richard N. Schaugaard
- Department of Chemistry, Wayne State University, Detroit, Michigan 48202, United States
| | - H. Bernhard Schlegel
- Department of Chemistry, Wayne State University, Detroit, Michigan 48202, United States
| | - Hien M. Nguyen
- Department of Chemistry, Wayne State University, Detroit, Michigan 48202, United States
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21
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Rozatian N, Hodgson DRW. Reactivities of electrophilic N-F fluorinating reagents. Chem Commun (Camb) 2021; 57:683-712. [PMID: 33367354 DOI: 10.1039/d0cc06339h] [Citation(s) in RCA: 41] [Impact Index Per Article: 13.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
Electrophilic fluorination represents one of the most direct and useful methods available for the selective introduction of fluorine into organic compounds. Electrophilic fluorinating reagents of the N-F class have revolutionised the incorporation of fluorine atoms into both pharmaceutically- and agrochemically-important substrates. Since the earliest N-F reagents were commercialised in the 1990s, their reactivities have been investigated using qualitative and, more recently, quantitative methods. This review discusses the different experimental approaches employed to determine reactivities of N-F reagents, focussing on the kinetics studies reported in recent years. We make critical evaluations of the experimental approaches against each other, theoretical approaches, and their applicability towards practical problems. The opportunities for achieving more efficient synthetic electrophilic fluorination processes through kinetic understanding are highlighted.
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Affiliation(s)
- Neshat Rozatian
- Chemistry Department, Durham University, South Road, Durham, UKDH1 3LE.
| | - David R W Hodgson
- Chemistry Department, Durham University, South Road, Durham, UKDH1 3LE.
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22
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Mora Flores EW, Uhrig ML, Postigo A. Photocatalyzed reductive fluoroalkylation of 2-acetoxyglycals towards the stereoselective synthesis of α-1-fluoroalkyl- C-glycosyl derivatives. Org Biomol Chem 2020; 18:8724-8734. [PMID: 33089846 DOI: 10.1039/d0ob01914c] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
A benign, efficient, regio- and stereoselective protocol for the syntheses of α-1-fluoroalkyl-C-glycosyl compounds bearing CF3, C4F9, and C6F13 substituents on the anomeric carbon has been developed by a new methodology starting from 2-acetoxyglycals for the first time. Remarkably, the reactions proceeded in only one step, through the visible light-photocatalyzed reductive fluoroalkylation of 2-acetoxyglycals by means of an Ir photocatalyst and employed commercially available fluoroalkyl iodides n-CnF2n+1-I (n = 1, 4, 6) as a source of fluoroalkyl radicals.
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Affiliation(s)
- Erwin W Mora Flores
- Universidad de Buenos Aires, Facultad de Farmacia y Bioquímica, Departamento de Química Orgánica, Junín 954, CP1113-Buenos Aires, Argentina.
| | - María Laura Uhrig
- Universidad de Buenos Aires, Facultad de Ciencias Exactas y Naturales, Departamento de Química Orgánica, Pabellón 2, Ciudad Universitaria, C1428EG Buenos Aires, Argentina. and Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET)-UBA, Centro de Investigación en Hidratos de Carbono (CIHIDECAR), Buenos Aires, Argentina
| | - Al Postigo
- Universidad de Buenos Aires, Facultad de Farmacia y Bioquímica, Departamento de Química Orgánica, Junín 954, CP1113-Buenos Aires, Argentina.
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23
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Liang L, Wade Wei T, Wu P, Herrebout W, Tsai M, Vincent SP. Nonhydrolyzable Heptose Bis‐ and Monophosphate Analogues Modulate Pro‐inflammatory TIFA‐NF‐κB Signaling. Chembiochem 2020; 21:2982-2990. [DOI: 10.1002/cbic.202000319] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2020] [Indexed: 12/12/2022]
Affiliation(s)
- Lina Liang
- University of Namur (UNamur), NARILIS Department of Chemistry rue de Bruxelles 61 5000 Namur Belgium
| | - Tong‐You Wade Wei
- Academia Sinica Institute of Biological Chemistry 128, Academia Road Section 2, Nankang 11529 Taipei Taiwan
| | - Pei‐Yu Wu
- Academia Sinica Institute of Biological Chemistry 128, Academia Road Section 2, Nankang 11529 Taipei Taiwan
| | - Wouter Herrebout
- University of Antwerp Department of Chemistry MolSpec Research group Groenenborgerlaan 171 2020 Antwerpen Belgium
| | - Ming‐Daw Tsai
- Academia Sinica Institute of Biological Chemistry 128, Academia Road Section 2, Nankang 11529 Taipei Taiwan
| | - Stéphane P. Vincent
- University of Namur (UNamur), NARILIS Department of Chemistry rue de Bruxelles 61 5000 Namur Belgium
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24
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Merieux G, Buchotte M, Muzard M, Plantier-Royon R. Synthesis of 2-Substituted Thioglycals from Carbohydrate-Derived Ketene Dithioacetals. European J Org Chem 2020. [DOI: 10.1002/ejoc.202000312] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Guillaume Merieux
- Université de Reims Champagne-Ardenne; Institut de Chimie Moléculaire de Reims (ICMR); CNRS UMR 7312; UFR Sciences Exactes et Naturelles; BP 1039 51687 Reims Cedex 2 France
| | - Marie Buchotte
- Université de Reims Champagne-Ardenne; Institut de Chimie Moléculaire de Reims (ICMR); CNRS UMR 7312; UFR Sciences Exactes et Naturelles; BP 1039 51687 Reims Cedex 2 France
| | - Murielle Muzard
- Université de Reims Champagne-Ardenne; Institut de Chimie Moléculaire de Reims (ICMR); CNRS UMR 7312; UFR Sciences Exactes et Naturelles; BP 1039 51687 Reims Cedex 2 France
| | - Richard Plantier-Royon
- Université de Reims Champagne-Ardenne; Institut de Chimie Moléculaire de Reims (ICMR); CNRS UMR 7312; UFR Sciences Exactes et Naturelles; BP 1039 51687 Reims Cedex 2 France
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25
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Pandey S, Thakur A, Reshma, Bari SS, Thapar R. A Facile and Stereoselective Synthesis of 3‐Phenylsulfinyl‐β‐lactams Using Selectfluor. ChemistrySelect 2019. [DOI: 10.1002/slct.201904114] [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)
- Suvidha Pandey
- Department of ChemistryPanjab University, Chandigarh India
| | - Aarti Thakur
- University Institute of Engineering and TechnologyPanjab University, Chandigarh India
| | - Reshma
- DAV College, Sector 10, Chandigarh India
| | | | - Renu Thapar
- University Institute of Engineering and TechnologyPanjab University, Chandigarh India
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26
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Zhou J, Fang Y, Wang F, Li J. Catalyst-free regioselective hydroxyfluorination and aminofluorination of α,β-unsaturated ketones. Org Biomol Chem 2019; 17:4470-4474. [PMID: 31017167 DOI: 10.1039/c9ob00467j] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
The catalyst-free direct regioselective α-fluoro-β-hydroxylation and α-fluoro-β-amidation of α,β-unsaturated ketones has been developed. Various α,β-unsaturated ketones react with Selectfluor in water and acetonitrile to give α-fluorohydrins and α-fluoroamides respectively with moderate to good yields. The mechanistic studies revealed the possibility of a radical based pathway.
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Affiliation(s)
- Jiadi Zhou
- Collaborative Innovation Center of Yangtze River Delta Region Green Pharmaceuticals, Zhejiang University of Technology, Hangzhou 310014, P. R. China.
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27
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Design, properties and applications of fluorinated and fluoroalkylated N-containing monosaccharides and their analogues. J Fluor Chem 2019. [DOI: 10.1016/j.jfluchem.2019.109364] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
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28
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Yang K, Li Y, Ma Z, Tang L, Yin Y, Zhang H, Li Z, Sun X. Metal-Free C-S Bond Cleavage to Access N
-Substituted Acrylamide and β-Aminopropanamide. European J Org Chem 2019. [DOI: 10.1002/ejoc.201900960] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Ke Yang
- Jiangsu Key Laboratory of Advanced Catalytic Materials & Technology; School of Petrochemical Engineering; Changzhou University; 1 Gehu Road 213164 Changzhou Jiangsu China
| | - Yi Li
- Jiangsu Key Laboratory of Advanced Catalytic Materials & Technology; School of Petrochemical Engineering; Changzhou University; 1 Gehu Road 213164 Changzhou Jiangsu China
| | - Zhiyan Ma
- Jiangsu Key Laboratory of Advanced Catalytic Materials & Technology; School of Petrochemical Engineering; Changzhou University; 1 Gehu Road 213164 Changzhou Jiangsu China
| | - Long Tang
- Jiangsu Key Laboratory of Advanced Catalytic Materials & Technology; School of Petrochemical Engineering; Changzhou University; 1 Gehu Road 213164 Changzhou Jiangsu China
| | - Yue Yin
- Jiangsu Key Laboratory of Advanced Catalytic Materials & Technology; School of Petrochemical Engineering; Changzhou University; 1 Gehu Road 213164 Changzhou Jiangsu China
| | - Hao Zhang
- Jiangsu Key Laboratory of Advanced Catalytic Materials & Technology; School of Petrochemical Engineering; Changzhou University; 1 Gehu Road 213164 Changzhou Jiangsu China
| | - Zhengyi Li
- Jiangsu Key Laboratory of Advanced Catalytic Materials & Technology; School of Petrochemical Engineering; Changzhou University; 1 Gehu Road 213164 Changzhou Jiangsu China
| | - Xiaoqiang Sun
- Jiangsu Key Laboratory of Advanced Catalytic Materials & Technology; School of Petrochemical Engineering; Changzhou University; 1 Gehu Road 213164 Changzhou Jiangsu China
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29
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Jójárt R, Traj P, Kovács É, Horváth Á, Schneider G, Szécsi M, Pál A, Paragi G, Mernyák E. Synthesis, Biological Evaluation and Docking Studies of 13-Epimeric 10-fluoro- and 10-Chloroestra-1,4-dien-3-ones as Potential Aromatase Inhibitors. Molecules 2019; 24:E1783. [PMID: 31072017 PMCID: PMC6540200 DOI: 10.3390/molecules24091783] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2019] [Revised: 04/26/2019] [Accepted: 04/29/2019] [Indexed: 02/03/2023] Open
Abstract
Fluorination of 13-epimeric estrones and their 17-deoxy counterparts was performed with Selectfluor as the reagent. In acetonitrile or trifluoroacetic acid (TFA), 10β-fluoroestra-1,4-dien-3-ones were formed exclusively. Mechanistic investigations suggest that fluorinations occurred via SET in acetonitrile, but another mechanism was operative in TFA. Simultaneous application of N-chlorosuccinimide (NCS) and Selectfluor in TFA led to a 1.3:1 mixture of 10β-fluoroestra-1,4-dien-3-one and 10β-chloroestra-1,4-dien-3-one as the main products. The potential inhibitory action of the 10-fluoro- or 10-chloroestra-1,4-dien-3-one products on human aromatase was investigated via in vitro radiosubstrate incubation. The classical estrane conformation with trans ring anellations and a 13β-methyl group seems to be crucial for the inhibition of the enzyme, while test compounds bearing the 13β-methyl group exclusively displayed potent inhibitory action with submicromolar or micromolar IC50 values. Concerning molecular level explanation of biological activity or inactivity, computational simulations were performed. Docking studies reinforced that besides the well-known Met374 H-bond connection, the stereocenter in the 13 position has an important role in the binding affinity. The configuration inversion at C-13 results in weaker binding of 13α-estrone derivatives to the aromatase enzyme.
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Affiliation(s)
- Rebeka Jójárt
- Department of Organic Chemistry, University of Szeged, Dóm tér 8, H-6720 Szeged, Hungary.
| | - Péter Traj
- Department of Organic Chemistry, University of Szeged, Dóm tér 8, H-6720 Szeged, Hungary.
| | - Édua Kovács
- Department of Organic Chemistry, University of Szeged, Dóm tér 8, H-6720 Szeged, Hungary.
| | - Ágnes Horváth
- Department of Organic Chemistry, University of Szeged, Dóm tér 8, H-6720 Szeged, Hungary.
| | - Gyula Schneider
- Department of Organic Chemistry, University of Szeged, Dóm tér 8, H-6720 Szeged, Hungary.
| | - Mihály Szécsi
- 1st Department of Medicine, University of Szeged, Korányi fasor 8⁻10, H-6720 Szeged, Hungary.
| | - Attila Pál
- Department of Medicinal Chemistry, University of Szeged, Dóm tér 8, H-6720 Szeged, Hungary.
| | - Gábor Paragi
- MTA-SZTE Biomimetic Systems Research Group, University of Szeged, Dóm tér 8, H-6720 Szeged, Hungary.
- Institute of Physics, University of Pecs, Ifjúság útja 6, H-7624 Pécs, Hungary.
| | - Erzsébet Mernyák
- Department of Organic Chemistry, University of Szeged, Dóm tér 8, H-6720 Szeged, Hungary.
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30
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Wood SH, Etridge S, Kennedy AR, Percy JM, Nelson DJ. The Electrophilic Fluorination of Enol Esters Using SelectFluor: A Polar Two-Electron Process. Chemistry 2019; 25:5574-5585. [PMID: 30724406 DOI: 10.1002/chem.201900029] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/03/2019] [Indexed: 11/11/2022]
Abstract
The reaction of enol esters with SelectFluor is facile and leads to the corresponding α-fluoroketones under mild conditions and, as a result, this route is commonly employed for the synthesis of medicinally important compounds such as fluorinated steroids. However, despite the use of this methodology in synthesis, the mechanism of this reaction and the influence of structure on reactivity are unclear. A rigorous mechanistic study of the fluorination of these substrates is presented, informed primarily by detailed and robust kinetic experiments. The results of this study implicate a polar two-electron process via an oxygen-stabilised carbenium species, rather than a single-electron process involving radical intermediates. The structure-reactivity relationships revealed here will assist synthetic chemists in deploying this type of methodology in the syntheses of α-fluoroketones.
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Affiliation(s)
- Susanna H Wood
- WestCHEM Department of Pure and Applied Chemistry, University of Strathclyde, 295 Cathedral Street, Glasgow, G1 1XL, UK
| | - Stephen Etridge
- GMS Manufacturing and Supply, GlaxoSmithKline, Cobden Street, Montrose, DD10 8EA, UK
| | - Alan R Kennedy
- WestCHEM Department of Pure and Applied Chemistry, University of Strathclyde, 295 Cathedral Street, Glasgow, G1 1XL, UK
| | - Jonathan M Percy
- WestCHEM Department of Pure and Applied Chemistry, University of Strathclyde, 295 Cathedral Street, Glasgow, G1 1XL, UK
| | - David J Nelson
- WestCHEM Department of Pure and Applied Chemistry, University of Strathclyde, 295 Cathedral Street, Glasgow, G1 1XL, UK
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31
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Zhao M, Cai J, Zhao X. Silver-promoted selective fluorination of 2-aminopyrimidines: synthesis of 5-fluoro-2-aminopyrimidine derivatives. Org Chem Front 2019. [DOI: 10.1039/c8qo01054d] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
Ag-Promoted selective fluorination of 2-aminopyrimidine derivatives with Selectfluor is presented, giving 4-substituted 5-fluoro-2-aminopyrimidines in fair to high yields with excellent regioselectivities.
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Affiliation(s)
- Mingzhu Zhao
- Department of Chemistry
- Tongji University
- Shanghai
- P. R. China
| | - Juewang Cai
- Department of Chemistry
- Tongji University
- Shanghai
- P. R. China
| | - Xiaoming Zhao
- Department of Chemistry
- Tongji University
- Shanghai
- P. R. China
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32
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Uhrig ML, Lantaño B, Postigo A. Synthetic strategies for fluorination of carbohydrates. Org Biomol Chem 2019; 17:5173-5189. [DOI: 10.1039/c9ob00405j] [Citation(s) in RCA: 26] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Different synthetic strategies for accomplishing regio- and stereoselective fluorinations of carbohydrate scaffolds are discussed in light of the biological implications arising from such substitutions.
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Affiliation(s)
- María Laura Uhrig
- Universidad de Buenos Aires
- Facultad de Ciencias Exactas y Naturales
- Departamento de Química Orgánica
- C1428EG Buenos Aires
- Argentina
| | - Beatriz Lantaño
- Departmento de Química Orgánica
- Facultad de Farmacia y Bioquímica
- Universidad de Buenos Aires
- Junin 954 CP1113-Buenos Aires
- Argentina
| | - Al Postigo
- Departmento de Química Orgánica
- Facultad de Farmacia y Bioquímica
- Universidad de Buenos Aires
- Junin 954 CP1113-Buenos Aires
- Argentina
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33
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Sharma P, Sharma RK. Electrophilic [N-F] + catalysed asymmetric allylation of (E)-N,1-diphenylmethanimine. Chirality 2018; 31:91-96. [PMID: 30565759 DOI: 10.1002/chir.23039] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2018] [Revised: 11/01/2018] [Accepted: 11/07/2018] [Indexed: 01/15/2023]
Abstract
New efficient catalysts based on electrophilic N-fluoro quaternary ammonium salts are reported for catalytic allylation of (E)-N,1-diphenylmethanimine. The chiral version of the catalyst based on cinchonidine (F-CD-BF4 ) shows high catalytic activity with approximately 94% ee and TOF (>800 h-1 ). The F-CD-BF4 is prepared from cinchonidine and Selectfluor by one-step transfer fluorination.
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Affiliation(s)
- Poonam Sharma
- Department of Chemistry, Indian Institute of Technology Jodhpur, Jodhpur, India
| | - Rakesh K Sharma
- Department of Chemistry, Indian Institute of Technology Jodhpur, Jodhpur, India
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34
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Yang K, Zhang H, Niu B, Tang T, Ge H. Benzisothiazol-3-ones through a Metal-Free Intramolecular N-S Bond Formation. European J Org Chem 2018. [DOI: 10.1002/ejoc.201801090] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Ke Yang
- School of Petrochemical Engineering; Changzhou University; 1 Gehu Road 213164 Changzhou Jiangsu China
- Department of Chemistry and Chemical Biology; Indiana University Purdue, University Indianapolis; 46202 Indianapolis Indiana USA
| | - Hao Zhang
- School of Petrochemical Engineering; Changzhou University; 1 Gehu Road 213164 Changzhou Jiangsu China
| | - Ben Niu
- Department of Chemistry and Chemical Biology; Indiana University Purdue, University Indianapolis; 46202 Indianapolis Indiana USA
| | - Tiandi Tang
- School of Petrochemical Engineering; Changzhou University; 1 Gehu Road 213164 Changzhou Jiangsu China
| | - Haibo Ge
- Department of Chemistry and Chemical Biology; Indiana University Purdue, University Indianapolis; 46202 Indianapolis Indiana USA
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35
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Setiawan D, Sethio D, Cremer D, Kraka E. From strong to weak NF bonds: on the design of a new class of fluorinating agents. Phys Chem Chem Phys 2018; 20:23913-23927. [PMID: 30206587 DOI: 10.1039/c8cp03843k] [Citation(s) in RCA: 36] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
A set of 50 molecules with NF bonds was investigated to determine the factors that influence the strength of a NF bond, with the aim of designing a new class of fluorinating agents. The intrinsic bond strength of the NF bonds was used as bond strength measure, derived from local stretching NF force constants obtained at the CCSD(T)/aug-cc-pVTZ and ωB97XD/aug-cc-pVTZ levels of theory. The investigation showed that the NF bond is a tunable covalent bond, with bond strength orders ranging from 2.5 (very strong) to 0.1 (very weak). NF bond strengthening is caused by a combination of different factors and can be achieved by e.g. ionization. Whereas, the NF bond weakening can be achieved by hypervalency on the N atom, using a N→Ch (Ch: O, S, Se) donor-acceptor type bond with different electron-withdrawing groups. These new insights into the nature of the NF bond were used to propose and design a new class of fluorinating agents. Hypervalent amine-chalcogenides turned out as most promising candidates for efficient electrophilic fluorinating agents.
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Affiliation(s)
- Dani Setiawan
- Department of Computational Medicine and Bioinformatics, University of Michigan, Ann Arbor, Michigan, USA
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36
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Timofeeva DS, Ofial AR, Mayr H. Kinetics of Electrophilic Fluorinations of Enamines and Carbanions: Comparison of the Fluorinating Power of N–F Reagents. J Am Chem Soc 2018; 140:11474-11486. [DOI: 10.1021/jacs.8b07147] [Citation(s) in RCA: 38] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Affiliation(s)
- Daria S. Timofeeva
- Department Chemie, Ludwig-Maximilians-Universität München, Butenandtstraße 5-13, 81377 München, Germany
| | - Armin R. Ofial
- Department Chemie, Ludwig-Maximilians-Universität München, Butenandtstraße 5-13, 81377 München, Germany
| | - Herbert Mayr
- Department Chemie, Ludwig-Maximilians-Universität München, Butenandtstraße 5-13, 81377 München, Germany
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37
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Mestre J, Collado D, Benito-Alifonso D, Rodríguez MA, Matheu MI, Díaz Y, Castillón S, Boutureira O. Highly reactive 2-deoxy-2-iodo-d- allo and d- gulo pyranosyl sulfoxide donors ensure β-stereoselective glycosylations with steroidal aglycones. RSC Adv 2018; 8:30076-30079. [PMID: 35546863 PMCID: PMC9085402 DOI: 10.1039/c8ra06619a] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2018] [Accepted: 08/11/2018] [Indexed: 12/31/2022] Open
Abstract
The preparation of well-defined d-xylo and d-ribo glycosides represents a synthetic challenge due to the limited configurational availability of starting materials and the laborious synthesis of homogeneous 2-deoxy-β-glycosidic linkages, in particular that of the sugar-steroid motif, which represents the "stereoselective determining step" of the overall synthesis. Herein we describe the use of 2-deoxy-2-iodo-glycopyranosyl sulfoxides accessible from widely available d-xylose and d-ribose monosaccharides as privileged glycosyl donors that permit activation at very low temperature. This ensures a precise kinetic control for a complete 1,2-trans stereoselective glycosylation of particularly challenging steroidal aglycones.
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Affiliation(s)
- Jordi Mestre
- Departament de Química Analítica i Química Orgànica, Universitat Rovira i Virgili C/Marcel·lí Domingo 1 43007 Tarragona Spain
| | - David Collado
- Departament de Química Analítica i Química Orgànica, Universitat Rovira i Virgili C/Marcel·lí Domingo 1 43007 Tarragona Spain
| | - David Benito-Alifonso
- Departament de Química Analítica i Química Orgànica, Universitat Rovira i Virgili C/Marcel·lí Domingo 1 43007 Tarragona Spain
| | - Miguel A Rodríguez
- Departament de Química Analítica i Química Orgànica, Universitat Rovira i Virgili C/Marcel·lí Domingo 1 43007 Tarragona Spain
| | - M Isabel Matheu
- Departament de Química Analítica i Química Orgànica, Universitat Rovira i Virgili C/Marcel·lí Domingo 1 43007 Tarragona Spain
| | - Yolanda Díaz
- Departament de Química Analítica i Química Orgànica, Universitat Rovira i Virgili C/Marcel·lí Domingo 1 43007 Tarragona Spain
| | - Sergio Castillón
- Departament de Química Analítica i Química Orgànica, Universitat Rovira i Virgili C/Marcel·lí Domingo 1 43007 Tarragona Spain
| | - Omar Boutureira
- Departament de Química Analítica i Química Orgànica, Universitat Rovira i Virgili C/Marcel·lí Domingo 1 43007 Tarragona Spain
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38
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Bume DD, Harry SA, Lectka T, Pitts CR. Catalyzed and Promoted Aliphatic Fluorination. J Org Chem 2018; 83:8803-8814. [PMID: 29894188 DOI: 10.1021/acs.joc.8b00982] [Citation(s) in RCA: 35] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
In the last six years, the direct functionalization of aliphatic C-H (and C-C) bonds through user-friendly, radical-based fluorination reactions has emerged as an exciting research area in fluorine chemistry. Considering the historical narratives about the challenges of developing practical radical fluorination in organic frameworks, notable advancements in controlling both reactivity and selectivity have been achieved during this time. As one of the participants in the field, herein, we a provide brief account of research efforts in our laboratory from the initial discovery of radical monofluorination on unactivated C-H bonds in 2012 to more useful strategies to install fluorine on biologically relevant molecules through directed fluorination methods. In addition, accompanying mechanistic studies that have helped guide reaction design are highlighted in context.
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Affiliation(s)
| | | | | | - Cody Ross Pitts
- Department of Chemistry and Applied Biosciences , ETH Zürich , Vladimir-Prelog-Weg 2 , 8093 Zürich , Switzerland
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39
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Pikun NV, Kolesnyk NP, Rusanov EB, Plotniece A, Rucins M, Sobolev A, Shermolovich YG. Synthesis of fluorinated 2,6-heptanediones and 2-oxa-6- azabicyclo[2.2.2]octanes from 1,4-dihydropyridines. Tetrahedron 2018. [DOI: 10.1016/j.tet.2018.04.075] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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40
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Jain N, Attia MA, Offen WA, Davies GJ, Brumer H. Synthesis and application of a highly branched, mechanism-based 2-deoxy-2-fluoro-oligosaccharide inhibitor of endo-xyloglucanases. Org Biomol Chem 2018; 16:8732-8741. [DOI: 10.1039/c8ob02250j] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Abstract
Xyloglucan (XyG) is a complex polysaccharide that is ubiquitous and often abundant in the cell walls of terrestrial plants.
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Affiliation(s)
- Namrata Jain
- Michael Smith Laboratories
- University of British Columbia
- Vancouver
- Canada
- Department of Chemistry
| | - Mohamed A. Attia
- Michael Smith Laboratories
- University of British Columbia
- Vancouver
- Canada
- Department of Chemistry
| | | | | | - Harry Brumer
- Michael Smith Laboratories
- University of British Columbia
- Vancouver
- Canada
- Department of Chemistry
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41
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Schalli M, Thonhofer M, Wolfsgruber A, Weber H, Fischer R, Saf R, Stütz AE. From secondary alcohols to tertiary fluoro substituents: A simple route to hydroxymethyl branched sugars with a fluorine substituent at the branching point. Carbohydr Res 2016; 436:11-19. [DOI: 10.1016/j.carres.2016.10.013] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2016] [Revised: 10/10/2016] [Accepted: 10/10/2016] [Indexed: 11/25/2022]
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42
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Tsukamoto H, Hanada S, Kumasaka K, Kagaya N, Izumikawa M, Shin-ya K, Doi T. Synthesis of Spiromamakone A Benzo Analogues via Double Oxa-Michael Addition of 1,8-Dihydroxynaphthalene. Org Lett 2016; 18:4848-4851. [DOI: 10.1021/acs.orglett.6b02328] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Hirokazu Tsukamoto
- Graduate
School of Pharmaceutical Sciences, Tohoku University, 6-3 Aza-aoba, Aramaki, Aoba-ku, Sendai 980-8578, Japan
| | - Shogo Hanada
- Graduate
School of Pharmaceutical Sciences, Tohoku University, 6-3 Aza-aoba, Aramaki, Aoba-ku, Sendai 980-8578, Japan
| | - Koichi Kumasaka
- Graduate
School of Pharmaceutical Sciences, Tohoku University, 6-3 Aza-aoba, Aramaki, Aoba-ku, Sendai 980-8578, Japan
| | - Noritaka Kagaya
- National Institute of Advanced Industrial Science and Technology (AIST), 2-4-7 Aomi, Koto-ku, Tokyo 135-0064, Japan
| | - Miho Izumikawa
- Japan Biological Informatics Consortium (JBIC), 2-4-7 Aomi, Koto-ku, Tokyo 135-0064, Japan
| | - Kazuo Shin-ya
- National Institute of Advanced Industrial Science and Technology (AIST), 2-4-7 Aomi, Koto-ku, Tokyo 135-0064, Japan
| | - Takayuki Doi
- Graduate
School of Pharmaceutical Sciences, Tohoku University, 6-3 Aza-aoba, Aramaki, Aoba-ku, Sendai 980-8578, Japan
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43
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Chen Q, Zeng J, Yan X, Huang Y, Du Z, Zhang K, Wen C. Mild and efficient oxidation of phosphorus(III) compounds with Selectfluor. Tetrahedron Lett 2016. [DOI: 10.1016/j.tetlet.2016.06.078] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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44
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Wang Q, Wei X, Liao K, Li H, Meng X, Li Z. A convenient preparation of glycosyl sulfoxides and its application to the synthesis of Salidroside epimer. Tetrahedron Lett 2016. [DOI: 10.1016/j.tetlet.2016.04.045] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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45
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Guo Z, Jin C, Zhou J, Su W. Copper(ii)-catalyzed cross dehydrogenative coupling reaction of N-hydroxyphthalimide with alkanes and ethers via unactivated C(sp3)–H activation at room temperature. RSC Adv 2016. [DOI: 10.1039/c6ra14697j] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
This reaction system shows mild condition and broad substrate scope for generation of O-substituted N-hydroxyphthalimide derivatives via unactivated C(sp3)–H activation.
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Affiliation(s)
- Zhicheng Guo
- Collaborative Innovation Center of Yangtze River Delta Region Green Pharmaceuticals
- Zhejiang University of Technology
- Hangzhou 310014
- China
| | - Can Jin
- College of Pharmaceutical Sciences
- Zhejiang University of Technology
- Hangzhou 310014
- China
| | - Jiadi Zhou
- Collaborative Innovation Center of Yangtze River Delta Region Green Pharmaceuticals
- Zhejiang University of Technology
- Hangzhou 310014
- China
| | - Weike Su
- Collaborative Innovation Center of Yangtze River Delta Region Green Pharmaceuticals
- Zhejiang University of Technology
- Hangzhou 310014
- China
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46
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Huynh AM, Menges J, Vester M, Dier T, Huch V, Volmer DA, Jung G. Monofluorination and Trifluoromethylation of BODIPY Dyes for Prolonged Single-Molecule Detection. Chemphyschem 2015; 17:433-42. [DOI: 10.1002/cphc.201500869] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2015] [Revised: 11/25/2015] [Indexed: 12/27/2022]
Affiliation(s)
- Anh Minh Huynh
- Biophysical Chemistry; Saarland University, Campus Building B22; 66123 Saarbrücken Germany
| | - Johannes Menges
- Biophysical Chemistry; Saarland University, Campus Building B22; 66123 Saarbrücken Germany
| | - Michael Vester
- Biophysical Chemistry; Saarland University, Campus Building B22; 66123 Saarbrücken Germany
| | - Tobias Dier
- Institute of Bioanalytical Chemistry; Saarland University; 66123 Saarbrücken Germany
| | - Volker Huch
- Inorganic and General Chemistry; Saarland University; 66123 Saarbrücken Germany
| | - Dietrich A. Volmer
- Institute of Bioanalytical Chemistry; Saarland University; 66123 Saarbrücken Germany
| | - Gregor Jung
- Biophysical Chemistry; Saarland University, Campus Building B22; 66123 Saarbrücken Germany
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47
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5-Fluoro derivatives of 4-epi-isofagomine as D-galactosidase inhibitors and potential pharmacological chaperones for GM1-gangliosidosis as well as Fabry's disease. Carbohydr Res 2015; 420:6-12. [PMID: 26717544 DOI: 10.1016/j.carres.2015.10.009] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2015] [Revised: 10/13/2015] [Accepted: 10/23/2015] [Indexed: 11/20/2022]
Abstract
Electrophilic fluorination of an exocyclic methoxymethylene enol ether derived from N-tert-butyloxycarbonyl-1,5-dideoxy-1,5-imino-3,4-O-isopropylidene-D-erythro-pent-2-ulose (11) provided the 5-fluoro derivative of the powerful β-galactosidase inhibitor 4-epi-isofagomine (8). This structural alteration, in combination with N-alkylation, led to considerably improved α-galactosidase selectivity. New compounds may serve as leads en route to new pharmacological chaperones for Fabry's disease.
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48
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Direct aqueous synthesis of non-protected glycosyl sulfoxides; weak inhibitory activity against glycosidases. Carbohydr Res 2015; 413:123-8. [DOI: 10.1016/j.carres.2015.06.003] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2015] [Accepted: 06/04/2015] [Indexed: 11/18/2022]
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49
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Sandford C, Rasappan R, Aggarwal VK. Synthesis of Enantioenriched Alkylfluorides by the Fluorination of Boronate Complexes. J Am Chem Soc 2015; 137:10100-3. [DOI: 10.1021/jacs.5b05848] [Citation(s) in RCA: 63] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Affiliation(s)
- Christopher Sandford
- School of Chemistry, University of Bristol, Cantock’s Close, Bristol BS8 1TS, United Kingdom
| | - Ramesh Rasappan
- School of Chemistry, University of Bristol, Cantock’s Close, Bristol BS8 1TS, United Kingdom
| | - Varinder K. Aggarwal
- School of Chemistry, University of Bristol, Cantock’s Close, Bristol BS8 1TS, United Kingdom
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50
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Yu W, Xu XH, Qing FL. Silver-Mediated Oxidative Fluorotrifluoromethylation of Unactivated Alkenes. Adv Synth Catal 2015. [DOI: 10.1002/adsc.201500027] [Citation(s) in RCA: 47] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
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