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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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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3
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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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4
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Kumar M, Gurawa A, Kumar N, Kashyap S. Bismuth-Catalyzed Stereoselective 2-Deoxyglycosylation of Disarmed/Armed Glycal Donors. Org Lett 2022; 24:575-580. [PMID: 34995079 DOI: 10.1021/acs.orglett.1c04008] [Citation(s) in RCA: 12] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Bi(OTf)3 promoted direct and highly stereoselective glycosylation of "disarmed" and "armed" glycals to synthesize 2-deoxyglycosides has been reported. The tunable and solvent-controlled chemoselective activation of deactivated glycal donors distinguishing the competitive Ferrier and 1,2-addition pathways was discovered to improve substrate scope. The practical versatility of the method has been amply demonstrated with the oligosaccharide syntheses and 2-deoxyglycosylation of high-value natural products and drugs.
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Affiliation(s)
- Manoj Kumar
- Carbohydrate Chemistry Research Laboratory (CCRL), Department of Chemistry, MNIT, Jaipur 302017, India
| | - Aakanksha Gurawa
- Carbohydrate Chemistry Research Laboratory (CCRL), Department of Chemistry, MNIT, Jaipur 302017, India
| | - Nitin Kumar
- Carbohydrate Chemistry Research Laboratory (CCRL), Department of Chemistry, MNIT, Jaipur 302017, India
| | - Sudhir Kashyap
- Carbohydrate Chemistry Research Laboratory (CCRL), Department of Chemistry, MNIT, Jaipur 302017, India
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5
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Xiong T, Xie R, Huang C, Lan X, Huang N, Yao H. Recent advances in the synthesis of thiosugars using glycal donors. J Carbohydr Chem 2022. [DOI: 10.1080/07328303.2022.2027433] [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)
- Tao Xiong
- Hubei Key Laboratory of Natural Products Research and Development, Key Laboratory of Functional Yeast (China National Light Industry), College of Biological and Pharmaceutical Sciences, China Three Gorges University, Yichang, P. R. China
| | - Rui Xie
- Hubei Key Laboratory of Natural Products Research and Development, Key Laboratory of Functional Yeast (China National Light Industry), College of Biological and Pharmaceutical Sciences, China Three Gorges University, Yichang, P. R. China
| | - Cai Huang
- Hubei Key Laboratory of Natural Products Research and Development, Key Laboratory of Functional Yeast (China National Light Industry), College of Biological and Pharmaceutical Sciences, China Three Gorges University, Yichang, P. R. China
| | - Xin Lan
- Hubei Key Laboratory of Natural Products Research and Development, Key Laboratory of Functional Yeast (China National Light Industry), College of Biological and Pharmaceutical Sciences, China Three Gorges University, Yichang, P. R. China
| | - Nianyu Huang
- Hubei Key Laboratory of Natural Products Research and Development, Key Laboratory of Functional Yeast (China National Light Industry), College of Biological and Pharmaceutical Sciences, China Three Gorges University, Yichang, P. R. China
| | - Hui Yao
- Hubei Key Laboratory of Natural Products Research and Development, Key Laboratory of Functional Yeast (China National Light Industry), College of Biological and Pharmaceutical Sciences, China Three Gorges University, Yichang, P. R. China
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Das P, Rahaman Molla M, Kumar A, Thakur R. o-Cyanobenzoate: A Recyclable and Reusable Stereo-directing Group for β-O-Glycosylation via Pd(0)-catalyzed Ferrier Rearrangement. Chem Asian J 2021; 17:e202101156. [PMID: 34866348 DOI: 10.1002/asia.202101156] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2021] [Revised: 11/13/2021] [Indexed: 11/11/2022]
Abstract
Inner sphere Tsuji-Trost reaction has found recent application for β-selective Ferrier rearrangement of glycal substrates with alcohol nucleophiles. Herein, we report an efficient and stereoselective synthesis of 2,3-dideoxy-β-O-glycosides from C3-(o-cyanobenzoate) ester protected glycal donors via Ferrier rearrangement under Pd(0)-catalyzed Tsuji-Trost conditions. The synthesized donors indeed reacted with a variety of acceptors to afford the corresponding glycosides in good yields and excellent β-stereoselectivity. The stereochemical outcome of the reactions has been found to be independent of the nature of protecting groups or conformational flexibility of the glycal donors. Furthermore, regeneration of ortho-cyanobenzoic acid post rearrangement makes it a recyclable and reusable stereodirecting group. A preliminary mechanistic study demonstrates the importance of cyano-group for the observed rearrangement and stereoselectivity. Incorporation of the directing group on the benzoate ester has altered the reactivity of the ester group as a leaving group for Tsuji-Trost as well as Ferrier Rearrangement pathway.
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Affiliation(s)
- Pradip Das
- Department of Chemistry, National Institute of Technology Patna, Patna, 800005, India
| | - Mosidur Rahaman Molla
- Department of Chemistry, National Institute of Technology Patna, Patna, 800005, India
| | - Amit Kumar
- Department of Chemistry, Indian Institute of Technology Patna, Patna, 801106, India
| | - Rima Thakur
- Department of Chemistry, National Institute of Technology Patna, Patna, 800005, India
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7
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Liu Y, Jiao Y, Luo H, Huang N, Lai M, Zou K, Yao H. Catalyst-Controlled Regiodivergent Synthesis of 1- and 3-Thiosugars with High Stereoselectivity and Chemoselectivity. ACS Catal 2021. [DOI: 10.1021/acscatal.1c00225] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Affiliation(s)
- Yuexin Liu
- Hubei Key Laboratory of Natural Products Research and Development, Key Laboratory of Functional Yeast (China National Light Industry), College of Biological and Pharmaceutical Sciences, China Three Gorges University, Yichang 443002, P. R. China
| | - Yang Jiao
- Hubei Key Laboratory of Natural Products Research and Development, Key Laboratory of Functional Yeast (China National Light Industry), College of Biological and Pharmaceutical Sciences, China Three Gorges University, Yichang 443002, P. R. China
| | - Huajun Luo
- Hubei Key Laboratory of Natural Products Research and Development, Key Laboratory of Functional Yeast (China National Light Industry), College of Biological and Pharmaceutical Sciences, China Three Gorges University, Yichang 443002, P. R. China
| | - Nianyu Huang
- Hubei Key Laboratory of Natural Products Research and Development, Key Laboratory of Functional Yeast (China National Light Industry), College of Biological and Pharmaceutical Sciences, China Three Gorges University, Yichang 443002, P. R. China
| | - Mengnan Lai
- Hubei Key Laboratory of Natural Products Research and Development, Key Laboratory of Functional Yeast (China National Light Industry), College of Biological and Pharmaceutical Sciences, China Three Gorges University, Yichang 443002, P. R. China
| | - Kun Zou
- Hubei Key Laboratory of Natural Products Research and Development, Key Laboratory of Functional Yeast (China National Light Industry), College of Biological and Pharmaceutical Sciences, China Three Gorges University, Yichang 443002, P. R. China
| | - Hui Yao
- Hubei Key Laboratory of Natural Products Research and Development, Key Laboratory of Functional Yeast (China National Light Industry), College of Biological and Pharmaceutical Sciences, China Three Gorges University, Yichang 443002, P. R. China
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8
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Achard T, Bellemin‐Laponnaz S. Recent Advances on Catalytic Osmium‐Free Olefin
syn
‐Dihydroxylation. European J Org Chem 2021. [DOI: 10.1002/ejoc.202001209] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Affiliation(s)
- Thierry Achard
- Département des Matériaux Organiques Institut de Physique et Chimie des Matériaux de Strasbourg (IPCMS) Université de Strasbourg CNRS UMR‐7504 23 rue du Loess, BP 43 67034 Strasbourg Cedex 2 France
| | - Stéphane Bellemin‐Laponnaz
- Département des Matériaux Organiques Institut de Physique et Chimie des Matériaux de Strasbourg (IPCMS) Université de Strasbourg CNRS UMR‐7504 23 rue du Loess, BP 43 67034 Strasbourg Cedex 2 France
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9
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Gurawa A, Kumar M, Kashyap S. Me 3SI-promoted chemoselective deacetylation: a general and mild protocol. RSC Adv 2021; 11:19310-19315. [PMID: 35478635 PMCID: PMC9033574 DOI: 10.1039/d1ra03209g] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2021] [Accepted: 05/16/2021] [Indexed: 11/21/2022] Open
Abstract
A catalytic and practical approach for the selective removal of acetyl groups using various substrates bearing orthogonal moieties has been demonstrated under ambient conditions.
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Affiliation(s)
- Aakanksha Gurawa
- Carbohydrate Chemistry Research Laboratory (CCRL)
- Department of Chemistry
- Malaviya National Institute of Technology Jaipur, (MNIT)
- Jaipur-302017
- India
| | - Manoj Kumar
- Carbohydrate Chemistry Research Laboratory (CCRL)
- Department of Chemistry
- Malaviya National Institute of Technology Jaipur, (MNIT)
- Jaipur-302017
- India
| | - Sudhir Kashyap
- Carbohydrate Chemistry Research Laboratory (CCRL)
- Department of Chemistry
- Malaviya National Institute of Technology Jaipur, (MNIT)
- Jaipur-302017
- India
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10
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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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11
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Pribulová B, Kováčová H, Jakubčinová J, Baráth M, Blahušiaková A, Petrušová M, Petruš L. Nitroalkene ring closure route to carbon-linked scaffolds for mimicking α-d-mannopyranosyl natural linkage. MONATSHEFTE FUR CHEMIE 2020. [DOI: 10.1007/s00706-020-02614-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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12
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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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13
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Tamburrini A, Colombo C, Bernardi A. Design and synthesis of glycomimetics: Recent advances. Med Res Rev 2020; 40:495-531. [DOI: 10.1002/med.21625] [Citation(s) in RCA: 50] [Impact Index Per Article: 12.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2019] [Revised: 06/06/2019] [Accepted: 07/09/2019] [Indexed: 12/16/2022]
Affiliation(s)
- Alice Tamburrini
- Dipartimento di ChimicaUniversita’ degli Studi di Milano Milano Italy
| | - Cinzia Colombo
- Dipartimento di ChimicaUniversita’ degli Studi di Milano Milano Italy
| | - Anna Bernardi
- Dipartimento di ChimicaUniversita’ degli Studi di Milano Milano Italy
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14
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Gurawa A, Kumar M, Rao DS, Kashyap S. KMnO 4-catalyzed chemoselective deprotection of acetate and controllable deacetylation–oxidation in one pot. NEW J CHEM 2020. [DOI: 10.1039/d0nj04321d] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Abstract
A highly chemoselective and facile protocol for deacetylation of a diverse range of substrates tolerating several sensitive functionalities was accomplished under environmentally friendly conditions.
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Affiliation(s)
- Aakanksha Gurawa
- Carbohydrate Chemistry Research Laboratory (CCRL)
- Department of Chemistry
- Malaviya National Institute of Technology
- Jaipur-302017
- India
| | - Manoj Kumar
- Carbohydrate Chemistry Research Laboratory (CCRL)
- Department of Chemistry
- Malaviya National Institute of Technology
- Jaipur-302017
- India
| | - Dodla S. Rao
- Carbohydrate Chemistry Research Laboratory (CCRL)
- Department of Chemistry
- Malaviya National Institute of Technology
- Jaipur-302017
- India
| | - Sudhir Kashyap
- Carbohydrate Chemistry Research Laboratory (CCRL)
- Department of Chemistry
- Malaviya National Institute of Technology
- Jaipur-302017
- India
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15
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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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16
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Synthesis of Sulfo-Sialic Acid Analogues: Potent Neuraminidase Inhibitors in Regards to Anomeric Functionality. Sci Rep 2017; 7:8239. [PMID: 28811524 PMCID: PMC5557986 DOI: 10.1038/s41598-017-07836-y] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2017] [Accepted: 06/30/2017] [Indexed: 11/08/2022] Open
Abstract
The design, synthesis and application of N-acetylneuraminic acid-derived compounds bearing anomeric sulfo functional groups are described. These novel compounds, which we refer to as sulfo-sialic acid analogues, include 2-decarboxy-2-deoxy-2-sulfo-N-acetylneuraminic acid and its 4-deoxy-3,4-dehydrogenated pseudoglycal. While 2-decarboxy-2-deoxy-2-sulfo-N-acetylneuraminic acid contains no further modifications of the 2-deoxy-pyranose ring, it is still a more potent inhibitor of avian-origin H5N1 neuraminidase (NA) and drug-resistant His275Tyr NA as compared to the oxocarbenium ion transition state analogue 2,3-dehydro-2-deoxy-N-acetylneuraminic acid. The sulfo-sialic acid analogues described in this report are also more potent inhibitors of influenza NA (up to 40-fold) and bacterial NA (up to 8.5-fold) relative to the corresponding anomeric phosphonic acids. These results confirm that this novel anomeric sulfo modification offers great potential to improve the potency of next-generation NA inhibitors including covalent inhibitors.
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17
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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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18
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An efficient method for the synthesis of pyranoid glycals. Carbohydr Res 2016; 431:42-6. [DOI: 10.1016/j.carres.2016.05.013] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2016] [Revised: 05/27/2016] [Accepted: 05/29/2016] [Indexed: 01/17/2023]
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19
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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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20
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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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21
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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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