1
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Kumar N, Yadav M, Kashyap S. Reagent-controlled chemo/stereoselective glycosylation of ʟ-fucal to access rare deoxysugars. Carbohydr Res 2024; 535:108992. [PMID: 38091695 DOI: 10.1016/j.carres.2023.108992] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2023] [Revised: 11/22/2023] [Accepted: 11/22/2023] [Indexed: 01/14/2024]
Abstract
2,6-Dideoxy sugars constitute an important class of anticancer antibiotics natural products and serve as essential medicinal tools for carbohydrate-based drug discovery and vaccine development. In particular, 2-deoxy ʟ-fucose or ʟ-oliose is a rare sugar and vital structural motif of several potent antifungal and immunosuppressive bioactive molecules. Herein, we devised a reagent-controlled stereo and chemoselective activation of ʟ-fucal, enabling the distinctive glycosylation pathways to access the rare ʟ-oliose and 2,3-unsaturated ʟ-fucoside. The milder oxo-philic Bi(OTf)3 catalyst induced the direct 1,2-addition predominantly, whereas B(C6F5)3 promoted the allylic Ferrier-rearrangement of the enol-ether moiety in ʟ-fucal glycal donor, distinguishing the competitive mechanisms. The reagent-tunable modular approach is highly advantageous, employing greener catalysts and atom-economical transformations, expensive ligand/additive-free, and probed for a diverse range of substrates comprising monosaccharides, amino-acids, bioactive natural products, and drug scaffolds embedded with susceptible or labile functionalities.
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Affiliation(s)
- Nitin Kumar
- Carbohydrate Chemistry Research Laboratory (CCRL), Department of Chemistry, Malaviya National Institute of Technology Jaipur (MNITJ), Jaipur, 302017, India
| | - Monika Yadav
- Carbohydrate Chemistry Research Laboratory (CCRL), Department of Chemistry, Malaviya National Institute of Technology Jaipur (MNITJ), Jaipur, 302017, India
| | - Sudhir Kashyap
- Carbohydrate Chemistry Research Laboratory (CCRL), Department of Chemistry, Malaviya National Institute of Technology Jaipur (MNITJ), Jaipur, 302017, India.
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2
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Zaręba P, Drabczyk AK, Wnorowska S, Wnorowski A, Jaśkowska J. New cyclic arylguanidine scaffolds as a platform for development of antimicrobial and antiviral agents. Bioorg Chem 2023; 139:106730. [PMID: 37473481 DOI: 10.1016/j.bioorg.2023.106730] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2023] [Revised: 06/22/2023] [Accepted: 07/09/2023] [Indexed: 07/22/2023]
Abstract
According to WHO, infectious diseases are still a significant threat to public health. The combine effects of antibiotic resistance, immunopressure, and mutations within the bacterial and viral genomes necessitates the search for new molecules exhibiting antimicrobial and antiviral activities. Such molecules often contain cyclic guanidine moiety. As part of this work, we investigated the selected antimicrobial and antiviral activity of compounds from the cyclic arylguanidine group. Molecules were designed using molecular modeling and obtained using microwave radiation (MW) and sonochemical ()))) methods, in accordance with the previously developed pathways. The obtained compounds were screened for the ability to inhibit the growth of Escherichia coli, Acinetobacter baumannii, Pseudomonas aeruginosa, Staphylococcus aureus, Candida albicans, and Cryptococcus neoformans. The capacity to block the entry of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) into the host cell was probed using a bioluminescence immunoassay. The cytotoxicity and hemolytic properties of the most active molecules were also evaluated. The N-[2-(naphthalen-1-yl)ethyl]-5-phenyl-1,4,5,6-tetrahydro-1,3,5-triazin-2-amine 12j showed a high inhibition of Staphylococcus aureus and Cryptococcus neoformans (MIC ≤ 0.25 µg/mL), with no cytotoxic nor hemolytic effect (CC50, HC10 > 32 µm/mL). The CO-ADD platform identified many potentially useful molecules. A particularly rich population was examined in the database of the N.D. Zelinsky Institute of Organic Chemistry, in which 2517 active molecules (MIC ≤ 32 mg/mL) were found, of which about 10% are active at very low concentrations (MIC ≤ 1 mg/mL).
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Affiliation(s)
- Przemysław Zaręba
- Faculty of Chemical Engineering and Technology, Department of Chemical Technology and Environmental Analytics, Cracow University of Technology, 24 Warszawska Street, 31-155 Cracow, Poland.
| | - Anna K Drabczyk
- Faculty of Chemical Engineering and Technology, Department of Organic Chemistry and Technology, Cracow University of Technology, 24 Warszawska Street, 31-155 Cracow, Poland
| | - Sylwia Wnorowska
- Department of Medical Chemistry, Faculty of Medical Sciences, Medical University of Lublin, 4a Chodzki Street, 20-093 Lublin, Poland
| | - Artur Wnorowski
- Department of Biopharmacy, Faculty of Pharmacy, Medical University, 4a Chodzki Street, 20-093 Lublin, Poland
| | - Jolanta Jaśkowska
- Faculty of Chemical Engineering and Technology, Department of Organic Chemistry and Technology, Cracow University of Technology, 24 Warszawska Street, 31-155 Cracow, Poland
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3
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Kumar M, Kumar N, Gurawa A, Kashyap S. Protecting group enabled stereocontrolled approach for rare-sugars talose/gulose via dual-ruthenium catalysis. Carbohydr Res 2023; 523:108705. [PMID: 36370626 DOI: 10.1016/j.carres.2022.108705] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2022] [Revised: 10/08/2022] [Accepted: 10/11/2022] [Indexed: 01/28/2023]
Abstract
We herein report a convenient and highly stereocontrolled approach for rare and vital ᴅ-talo and ᴅ-gulo sugars directly from economical ᴅ-galactal through dual ruthenium-catalysis. The stereo-divergent strategy involves Ru(III)Cl3-catalyzed Ferrier glycosylation of ᴅ-galactal to give 2,3-unsaturated ᴅ-galactopyranoside, further selective functionalization of C-4 and C-6 position with diverse protecting groups and dihydroxylation with Ru(VIII)O4 generated in situ providing access to talo/gulo isomers. The α-anomeric stereoselectivity and syn-diastereoselectivity in glycosylation-dihydroxylation steps have been predominantly achieved by judicious selection of stereoelectronically diverse protecting groups. The synthetic utility of the dual-ruthenium catalysis was demonstrated for efficiently assembling the ᴅ-talose and/or ᴅ-gulose sugars in natural products and bioactive scaffolds.
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Affiliation(s)
- Manoj Kumar
- Carbohydrate Chemistry Research Laboratory (CCRL), Department of Chemistry, Malaviya National Institute of Technology (MNIT), Jaipur, 302017, India
| | - Nitin Kumar
- Carbohydrate Chemistry Research Laboratory (CCRL), Department of Chemistry, Malaviya National Institute of Technology (MNIT), Jaipur, 302017, India
| | - Aakanksha Gurawa
- Carbohydrate Chemistry Research Laboratory (CCRL), Department of Chemistry, Malaviya National Institute of Technology (MNIT), Jaipur, 302017, India
| | - Sudhir Kashyap
- Carbohydrate Chemistry Research Laboratory (CCRL), Department of Chemistry, Malaviya National Institute of Technology (MNIT), Jaipur, 302017, India.
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4
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Zaręba P, Drabczyk AK, Wnorowski A, Pindelska E, Latacz G, Jaśkowska J. Eco-friendly methods of synthesis and preliminary biological evaluation of sulfonamide derivatives of cyclic arylguanidines. ULTRASONICS SONOCHEMISTRY 2022; 90:106165. [PMID: 36183548 PMCID: PMC9529985 DOI: 10.1016/j.ultsonch.2022.106165] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 07/18/2022] [Revised: 09/09/2022] [Accepted: 09/10/2022] [Indexed: 06/16/2023]
Abstract
The chemotype of arylsulfonamide derivatives of cyclic arylguanidines is a source of molecules with valuable biological activities, including antimicrobial and antitumor properties. The methods of the synthesis presented in the literature are characterized with low selectivity and high environmental nuisance. In this publication, we present a developed alternative and earlier undescribed pathway C, for the synthesis of arylsulfonamide derivatives of cyclic arylguanidines (N-(1H-arylimidazol-2-yl)arylsulfonamides and N-(1,4-dihydroquinazolin-2-yl)arylsulfonamides), including reaction between 2-(methylsulfanyl)-benzimidazole or 2-(methylsulfanyl)-3,4-dihydroquinazoline with arylsulfonamides. We also optimized previously reported methods; A (reaction of 2-aminobenzimidazole or 2-amino-3,4-dihydroquinazoline with arylsulfonyl chlorides) and B (reaction of dimethyl-(arylsulfonyl)carbonodithioimidate with aryldiamines). The conducted research allowed achieving two independent ecological and quick methods of obtaining the desired products. We used ecological methods of ultrasound-assisted or microwave synthesis, solvent-free reactions and a"green" reaction environment. In both pathways, it has proven advantageous to use H2O as the solvent and K2CO3 (1 or 3 equivalent) as the basic agent. In the sonochemical variant, the efficiency reached B: 37-89 %, C: 90 % in 60 min (P = 80 W and f = 40 kHz), while in the microwave synthesis it was B: 38-74 %, C: 63-85 % in 0.5-4 min (P = 50 W). Path A led to a complementary substitution product (i.e. 1-(arylsulfonyl)-1H-benzimidazol-2-amine or 1-(arylsulfonyl)-1,4-dihydroquinazolin-2-amine). We obtained a small group of compounds that were tested for cytotoxicity. The 10f (N-(1,4-dihydroquinazolin-2-yl)naphthalene-1-sulfonamide) showed cytotoxic activity towards human astrocytoma cell line 1321 N1. The calculated IC50 value was 8.22 µM at 24 h timepoint (doxorubicin suppressed 1321 N1 cell viability with IC50 of 1.1 µM). The viability of the cells exposed to 10f for 24 h dropped to 48.0 % compared to vehicle control, while the cells treated with doxorubicin experienced decline to 47.5 %. We assessed its potential usefulness in pharmacotherapy in the ADMET study, confirming its ability to cross the blood-brain barrier (Pe = 5.0 ± 1.5 × 10-6 cm/s) and the safety of its potential use in terms of DDI and hepatotoxicity.
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Affiliation(s)
- Przemysław Zaręba
- Faculty of Chemical Engineering and Technology, Department of Chemical Technology and Environmental Analytics, Cracow University of Technology, 24 Warszawska Street, 31-155 Cracow, Poland.
| | - Anna K Drabczyk
- Faculty of Chemical Engineering and Technology, Department of Organic Chemistry and Technology, Cracow University of Technology, 24 Warszawska Street, 31-155 Cracow, Poland
| | - Artur Wnorowski
- Department of Biopharmacy, Faculty of Pharmacy, Medical University, Lublin, Poland
| | - Edyta Pindelska
- Department of Analytical Chemistry and Biomaterials, Faculty of Pharmacy, Medical University of Warsaw, 1 Banacha, 02-093 Warsaw, Poland
| | - Gniewomir Latacz
- Department of Technology and Biotechnology of Drugs, Jagiellonian University Medical College, 9 Medyczna Street, 30-688 Cracow, Poland
| | - Jolanta Jaśkowska
- Faculty of Chemical Engineering and Technology, Department of Organic Chemistry and Technology, Cracow University of Technology, 24 Warszawska Street, 31-155 Cracow, Poland
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5
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Kumar M, Kumar N, Gurawa A, Kashyap S. Stereoselective Synthesis of
α
‐ʟ‐Rhamnopyranosides from ʟ‐Rhamnal Employing Ruthenium‐Catalysis. ChemistrySelect 2022. [DOI: 10.1002/slct.202200963] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Manoj Kumar
- Carbohydrate Chemistry Research Laboratory (CCRL) Department of Chemistry Malaviya National Institute of Technology Jaipur (MNIT Jaipur) J. L. N. Marg Jaipur 302 017 INDIA
| | - Nitin Kumar
- Carbohydrate Chemistry Research Laboratory (CCRL) Department of Chemistry Malaviya National Institute of Technology Jaipur (MNIT Jaipur) J. L. N. Marg Jaipur 302 017 INDIA
| | - Aakanksha Gurawa
- Carbohydrate Chemistry Research Laboratory (CCRL) Department of Chemistry Malaviya National Institute of Technology Jaipur (MNIT Jaipur) J. L. N. Marg Jaipur 302 017 INDIA
| | - Sudhir Kashyap
- Carbohydrate Chemistry Research Laboratory (CCRL) Department of Chemistry Malaviya National Institute of Technology Jaipur (MNIT Jaipur) J. L. N. Marg Jaipur 302 017 INDIA
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6
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Citric acid mediated simple and stereoselective synthesis of o-linked glycosides by Ferrier rearrangement. RESULTS IN CHEMISTRY 2022. [DOI: 10.1016/j.rechem.2022.100347] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
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7
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Gu L, Wang Y, Cheng Z, Sun Y, Gong X, Li Z, Ma W. Brønsted Acid Promoted
N
‐Dealkylation of
N
‐Alkyl(sulfon)amides. ChemistrySelect 2021. [DOI: 10.1002/slct.202101676] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Affiliation(s)
- Linghui Gu
- Antibiotics Research and Re-evaluation Key Laboratory of Sichuan Province Sichuan Industrial Institute of Antibiotics School of Pharmacy Chengdu University No 168. Huaguan Rd Chengdu 610052 People's Republic of China
| | - Yang Wang
- Antibiotics Research and Re-evaluation Key Laboratory of Sichuan Province Sichuan Industrial Institute of Antibiotics School of Pharmacy Chengdu University No 168. Huaguan Rd Chengdu 610052 People's Republic of China
| | - Zemin Cheng
- Antibiotics Research and Re-evaluation Key Laboratory of Sichuan Province Sichuan Industrial Institute of Antibiotics School of Pharmacy Chengdu University No 168. Huaguan Rd Chengdu 610052 People's Republic of China
| | - Yanan Sun
- Antibiotics Research and Re-evaluation Key Laboratory of Sichuan Province Sichuan Industrial Institute of Antibiotics School of Pharmacy Chengdu University No 168. Huaguan Rd Chengdu 610052 People's Republic of China
| | - Xin Gong
- Antibiotics Research and Re-evaluation Key Laboratory of Sichuan Province Sichuan Industrial Institute of Antibiotics School of Pharmacy Chengdu University No 168. Huaguan Rd Chengdu 610052 People's Republic of China
| | - Zheyu Li
- Antibiotics Research and Re-evaluation Key Laboratory of Sichuan Province Sichuan Industrial Institute of Antibiotics School of Pharmacy Chengdu University No 168. Huaguan Rd Chengdu 610052 People's Republic of China
| | - Wenbo Ma
- Antibiotics Research and Re-evaluation Key Laboratory of Sichuan Province Sichuan Industrial Institute of Antibiotics School of Pharmacy Chengdu University No 168. Huaguan Rd Chengdu 610052 People's Republic of China
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8
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Sangwan R, Khanam A, Mandal PK. An Overview on the Chemical
N
‐Functionalization of Sugars and Formation of
N
‐Glycosides. European J Org Chem 2020. [DOI: 10.1002/ejoc.202000813] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Affiliation(s)
- Rekha Sangwan
- Medicinal and Process Chemistry Division CSIR‐Central Drug Research Institute Sector 10, Jankipuram extn., Sitapur Road 226 031 Lucknow India
- Academy of Scientific and Innovative Research (AcSIR) 201002 Ghaziabad India
| | - Ariza Khanam
- Medicinal and Process Chemistry Division CSIR‐Central Drug Research Institute Sector 10, Jankipuram extn., Sitapur Road 226 031 Lucknow India
| | - Pintu Kumar Mandal
- Medicinal and Process Chemistry Division CSIR‐Central Drug Research Institute Sector 10, Jankipuram extn., Sitapur Road 226 031 Lucknow India
- Academy of Scientific and Innovative Research (AcSIR) 201002 Ghaziabad India
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9
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Kumar M, Reddy TR, Gurawa A, Kashyap S. Copper(ii)-catalyzed stereoselective 1,2-addition vs. Ferrier glycosylation of "armed" and "disarmed" glycal donors. Org Biomol Chem 2020; 18:4848-4862. [PMID: 32608448 DOI: 10.1039/d0ob01042a] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
Selective activation of "armed' and ''disarmed" glycal donors enabling the stereo-controlled glycosylations by employing Cu(ii)-catalyst as the promoter has been realized. The distinctive stereochemical outcome in the process is mainly influenced by the presence of diverse protecting groups on the donor and the solvent system employed. The protocol is compatible with a variety of aglycones including carbohydrates, amino acids, and natural products to access deoxy-glycosides and glycoconjugates with high α-anomeric selectivity. Notably, the synthetic practicality of the method is amply verified for the stereoselective assembling of trisaccharides comprising 2-deoxy components. Mechanistic studies involving deuterated experiments validate the syn-diastereoselective 1,2-addition of acceptors on the double bond of armed donors.
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Affiliation(s)
- Manoj Kumar
- Carbohydrate Chemistry Research Laboratory (CCRL), Department of Chemistry, Malaviya National Institute of Technology (MNIT), Jaipur-302017, India.
| | - Thurpu Raghavender Reddy
- Carbohydrate Chemistry Research Laboratory (CCRL), Department of Chemistry, Malaviya National Institute of Technology (MNIT), Jaipur-302017, India.
| | - Aakanksha Gurawa
- Carbohydrate Chemistry Research Laboratory (CCRL), Department of Chemistry, Malaviya National Institute of Technology (MNIT), Jaipur-302017, India.
| | - Sudhir Kashyap
- Carbohydrate Chemistry Research Laboratory (CCRL), Department of Chemistry, Malaviya National Institute of Technology (MNIT), Jaipur-302017, India.
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10
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Abstract
The substitution reaction of glycal (1,2-unsaturated cyclic carbohydrate derivative)
at C1 by allyl rearrangement in the presence of a catalyst is called Ferrier type-I rearrangement.
2,3-Unsaturated glycosides are usually obtained from glycals through Ferrier
type-I rearrangement, and their potential biological activities have gradually attracted
widespread attention of researchers. This review summarizes recent advances (2009-
present) in the application of various types of catalysts to Ferrier type-I rearrangement reactions,
including their synthesis, mechanism, and application of 2, 3-unsaturated glycosides.
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Affiliation(s)
- Nan Jiang
- School of Chemistry and Molecular Engineering, East China Normal University, Shanghai 200241, China
| | - Zhengliang Wu
- School of Chemistry and Molecular Engineering, East China Normal University, Shanghai 200241, China
| | - Youxian Dong
- School of Chemistry and Molecular Engineering, East China Normal University, Shanghai 200241, China
| | - Xiaoxia Xu
- School of Chemistry and Molecular Engineering, East China Normal University, Shanghai 200241, China
| | - Xiaxia Liu
- School of Chemistry and Molecular Engineering, East China Normal University, Shanghai 200241, China
| | - Jianbo Zhang
- School of Chemistry and Molecular Engineering, East China Normal University, Shanghai 200241, China
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11
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Dai Y, Zheng J, Zhang Q. General Strategy for Stereoselective Synthesis of β- N-Glycosyl Sulfonamides via Palladium-Catalyzed Glycosylation. Org Lett 2018; 20:3923-3927. [PMID: 29916717 DOI: 10.1021/acs.orglett.8b01506] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
A highly efficient and mild glycosylation reaction between 3,4- O-carbonate glycal and N-tosyl functionalized aliphatic and aromatic amines via palladium-catalyzed decarboxylative allylation is disclosed. A wide range of highly functionalized 2,3-unsaturated β- N-glycosides are furnished in good to excellent yields and complete regioselectivity and stereoselectivity. In addition, applications of the glycosyl sulfonamides as the precursor to assemble functional derivatives have also been explored, including glycosylation, dihydroxylation, and nucleophilic addition to the N-glycosides.
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Affiliation(s)
- Yuanwei Dai
- Department of Chemistry , University at Albany, State University of New York , 1400 Washington Avenue , Albany , New York 12222 , United States
| | - Jianfeng Zheng
- Department of Chemistry , University at Albany, State University of New York , 1400 Washington Avenue , Albany , New York 12222 , United States
| | - Qiang Zhang
- Department of Chemistry , University at Albany, State University of New York , 1400 Washington Avenue , Albany , New York 12222 , United States
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12
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Rao DS, Reddy TR, Kashyap S. Chemoselective and stereospecific iodination of alkynes using sulfonium iodate(i) salt. Org Biomol Chem 2018; 16:1508-1518. [DOI: 10.1039/c7ob03076b] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The sulfonium iodate(i) electrophilc reagent efficiently promoted the stereodivergent iodination of alkynes. The chemoselective iodination was effectively realized by switching the solvent system to access the 1-iodoalkyne and (E)-vicinal-diiodoalkenes.
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Affiliation(s)
- Dodla S. Rao
- Department of Chemistry
- Malaviya National Institute of Technology (MNIT)
- Jaipur-302 017
- India
| | - Thurpu R. Reddy
- Department of Chemistry
- Malaviya National Institute of Technology (MNIT)
- Jaipur-302 017
- India
| | - Sudhir Kashyap
- Department of Chemistry
- Malaviya National Institute of Technology (MNIT)
- Jaipur-302 017
- India
- INSPIRE Faculty
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13
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Rao DS, Reddy TR, Babachary K, Kashyap S. Regioselective vicinal functionalization of unactivated alkenes with sulfonium iodate(i) reagents under metal-free conditions. Org Biomol Chem 2016; 14:7529-43. [PMID: 27430994 DOI: 10.1039/c6ob01179a] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
Metal-free, molecular iodine-free direct 1,2-difunctionalization of unactivated alkenes has been reported. The sulfonium iodate(i) reagent efficiently promoted the intermolecular vicinal iodo-functionalization of a diverse range of olefins in a stereo and regioselective manner. This method enables the divergent and straightforward preparation of synthetically useful functionalities; β-iodocarboxylates, β-iodohydrins, and β-iodoethers in a one-step process. Further interconversion of iodo-functionalized derivatives allows easy access to valuable synthetic intermediates en route to biologically active molecules.
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Affiliation(s)
- Dodla S Rao
- Department of Chemistry, Malaviya National Institute of Technology, Jaipur-302017, India.
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14
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Battina SK, Kashyap S. Copper mediated iodoacetoxylation and glycosylation: effective and convenient approaches for the stereoselective synthesis of 2-deoxy-2-iodo glycosides. Tetrahedron Lett 2016. [DOI: 10.1016/j.tetlet.2016.01.035] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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15
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Kundoor G, Rao DS, Kashyap S. Regioselective Direct Difunctionalization of Glycals: Convenient Access to 2-Deoxyglycoconjugates Mediated by Tetra-n-butylammonium Iodide/Sodium Periodate. ASIAN J ORG CHEM 2015. [DOI: 10.1002/ajoc.201500470] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Affiliation(s)
- Govindareddy Kundoor
- Discovery Laboratory, Organic and Biomolecular Chemistry Division; Indian Institute of Chemical Technology (CSIR), Tarnaka; Uppal Road Hyderabad- 500007 India
| | - Dodla Sivanageswara Rao
- Discovery Laboratory, Organic and Biomolecular Chemistry Division; Indian Institute of Chemical Technology (CSIR), Tarnaka; Uppal Road Hyderabad- 500007 India
| | - Sudhir Kashyap
- Discovery Laboratory, Organic and Biomolecular Chemistry Division; Indian Institute of Chemical Technology (CSIR), Tarnaka; Uppal Road Hyderabad- 500007 India
- Academy of Scientific and Innovative Research; Indian Institute of Chemical Technology (CSIR); Hyderabad- 500 007 India
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16
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Reddy TR, Rao DS, Babachary K, Kashyap S. Sulfonium Salts of Iodine(I) Species as Efficient Reagents for the Regioselective Bisfunctionalisation of Glycals and Enol Ethers. European J Org Chem 2015. [DOI: 10.1002/ejoc.201501183] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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17
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Chen P, Bi B. Preparation of 2,3-unsaturated pseudoglycosides with Ferrier Rearrangement promoted by Tm(OTf)3 as a highly efficient catalyst. Tetrahedron Lett 2015. [DOI: 10.1016/j.tetlet.2015.06.077] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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18
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Chittela S, Reddy TR, Radha Krishna P, Kashyap S. Ruthenium Catalyzed Stereo/Chemo/Regioselective One-Pot Synthesis of C(2)–C(3) Unsaturated and α-d-Mannopyranosyl Sulfones. J Org Chem 2015; 80:7108-16. [DOI: 10.1021/acs.joc.5b00975] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Sravanthi Chittela
- D-207, Discovery Laboratory,
Organic and Biomolecular Chemistry Division, CSIR-Indian Institute of Chemical Technology, Hyderabad-500 007, India
| | - Thurpu Raghavender Reddy
- D-207, Discovery Laboratory,
Organic and Biomolecular Chemistry Division, CSIR-Indian Institute of Chemical Technology, Hyderabad-500 007, India
| | - Palakodety Radha Krishna
- D-207, Discovery Laboratory,
Organic and Biomolecular Chemistry Division, CSIR-Indian Institute of Chemical Technology, Hyderabad-500 007, India
| | - Sudhir Kashyap
- D-207, Discovery Laboratory,
Organic and Biomolecular Chemistry Division, CSIR-Indian Institute of Chemical Technology, Hyderabad-500 007, India
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19
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Reddy TR, Battina SK, Kashyap S. Zn(II) Triflate-CatalyzedN-Glycosylation: Synthesis of Sulfonamide and Amide Functionalized 2,3-Unsaturated Glycosides. J Carbohydr Chem 2015. [DOI: 10.1080/07328303.2015.1018994] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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20
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Battina SK, Reddy TR, Radha Krishna P, Kashyap S. Ruthenium-catalyzed thioglycosylation: synthesis of 2,3-unsaturated-S-glycosides. Tetrahedron Lett 2015. [DOI: 10.1016/j.tetlet.2015.02.069] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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21
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Srinivas B, Reddy TR, Kashyap S. Ruthenium catalyzed synthesis of 2,3-unsaturated C-glycosides from glycals. Carbohydr Res 2015; 406:86-92. [DOI: 10.1016/j.carres.2015.01.009] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2014] [Revised: 01/12/2015] [Accepted: 01/20/2015] [Indexed: 12/20/2022]
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22
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Reddy TR, Rao DS, Kashyap S. A mild and efficient Zn-catalyzed C-glycosylation: synthesis of C(2)–C(3) unsaturated C-linked glycopyranosides. RSC Adv 2015. [DOI: 10.1039/c5ra03328d] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
A mild and efficient protocol for the C-glycosylation from glycals is described by using Zn-catalysis.
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Affiliation(s)
- Thurpu Raghavender Reddy
- D-207
- Discovery Laboratory
- Organic and Biomolecular Chemistry Division
- CSIR-Indian Institute of Chemical Technology
- Hyderabad-500 007
| | - Dodla Sivanageswara Rao
- D-207
- Discovery Laboratory
- Organic and Biomolecular Chemistry Division
- CSIR-Indian Institute of Chemical Technology
- Hyderabad-500 007
| | - Sudhir Kashyap
- D-207
- Discovery Laboratory
- Organic and Biomolecular Chemistry Division
- CSIR-Indian Institute of Chemical Technology
- Hyderabad-500 007
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