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Aghi A, Sau S, Kumar A. Fe(III)-catalyzed stereoselective synthesis of deoxyglycosides using stable bifunctional deoxy-phenylpropiolate glycoside donors. Carbohydr Res 2024; 536:109051. [PMID: 38325069 DOI: 10.1016/j.carres.2024.109051] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2023] [Revised: 01/30/2024] [Accepted: 01/30/2024] [Indexed: 02/09/2024]
Abstract
Herein, we report a mild and economical route for the stereoselective synthesis of 2-deoxy and 2,6-dideoxyglycosides via FeCl3-catalyzed activation of bench stable deoxy-phenylpropiolate glycosyl donors (D-PPGs). Optimized reaction conditions work well under additive-free conditions to afford the corresponding 2-deoxy and 2,6-dideoxyglycosides in good yields with high α-anomeric selectivity by reacting with sugar and non-sugar-based acceptors. The optimized conditions were also extended for disarmed D-PPG donors. In addition, the developed strategy is amenable to high-scale-up synthesis.
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Affiliation(s)
- Anjali Aghi
- Department of Chemistry, Indian Institute of Technology Patna, Bihta, Bihar, 801106, India
| | - Sankar Sau
- Department of Chemistry, Indian Institute of Technology Patna, Bihta, Bihar, 801106, India
| | - Amit Kumar
- Department of Chemistry, Indian Institute of Technology Patna, Bihta, Bihar, 801106, India.
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2
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Luo T, Xu TT, Guo YF, Dong H. SnCl 4 Promoted Efficient Cleavage of Acetal/Ketal Groups with the Assistance of Water in CH 2Cl 2. MOLECULES (BASEL, SWITZERLAND) 2022; 27:molecules27238258. [PMID: 36500346 PMCID: PMC9736348 DOI: 10.3390/molecules27238258] [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: 10/27/2022] [Revised: 11/23/2022] [Accepted: 11/24/2022] [Indexed: 11/29/2022]
Abstract
Acetalization and deacetalation are a pair of routine manipulations to protect and deprotect the 4- and 6-hydroxyl groups of glycosides in the synthesis of glycosyl building blocks. In this study, we found that treatment of SnCl4 with various carbohydrates containing acetal/ketal groups with the assistance of water in CH2Cl2 led to deacetalization/deketalization products in almost quantitative yields. In addition, for substrates containing both acetal/ketal and p-methoxylbenzyl groups, we also found that the p-methoxylbenzyl group was selectively cleaved by the use of a catalytic amount of SnCl4, while the acetal/ketal groups remained. Furthermore, based on this, 4,6-benzylidene glycosides can be conveniently converted to 4,6-OAc or 4-OH, 6-OAc glycosides.
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Gupta S, Sharma A, Mondal D, Bera S. Advancement of the Cleavage Methods of Carbohydrate-derived Isopropylidene and Cyclohexylidene Ketals. CURR ORG CHEM 2022. [DOI: 10.2174/1385272826666220426104217] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Abstract:
Carbohydrates, amino acids, and nucleosides, the fundamental building blocks of complex biomolecules in nature, are essential starting materials for the fabrication of natural and unnatural structural entities, which necessitate the masking and demasking of various functional groups with the utmost chemoselectivity, mildness, and efficiency to avoid unintended bond breaking and formation, as well as associated reactions. Ketals, benzylidene, methoxymethyl, p-methoxybenzyl, silyl ethers, trityl, tert-butyl carbamate, and other functional groups are widely used in modern organic synthesis. In carbohydrate chemistry, the commonly used protecting functionality of isopropylidene and cyclohexylidene ketals necessitates effective methods for selective cleavage. This review summarises different methods for deblocking isopropylidene and cyclohexylidene ketals using inorganic acids, Lewis acid, silica-supported inorganic acids, Amberlite-120 (H+) resin, phosphotungstic acid, Nafion-H, NaBArF4.2H2O, montmorillonite clay, Dowex 50W-X8, camphorsulphonic acid (CSA), ceric ammonium nitrate, molecular iodine, ionic liquids, zeolites and so on.
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Affiliation(s)
- Shilpi Gupta
- School of Chemical Sciences, Central University of Gujarat, Gandhinagar-382030, India
| | - Anjali Sharma
- School of Chemical Sciences, Central University of Gujarat, Gandhinagar-382030, India
| | - Dhananjoy Mondal
- School of Chemical Sciences, Central University of Gujarat, Gandhinagar-382030, India
| | - Smritilekha Bera
- School of Chemical Sciences, Central University of Gujarat, Gandhinagar-382030, India
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Reddy NR, Kumar R, Baskaran S. A Direct Method for the Efficient Synthesis of Benzylidene Acetal at Room Temperature. European J Org Chem 2019. [DOI: 10.1002/ejoc.201801731] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
| | - Rashmi Kumar
- Department of Chemistry; Indian Institute of Technology Madras; 600036 Chennai India
| | - Sundarababu Baskaran
- Department of Chemistry; Indian Institute of Technology Madras; 600036 Chennai India
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Talukdar R. Dimethyl sulfoxide as a “methylene” source: Ru(ii) photo-catalysed facile synthesis of acetals from alcohols. NEW J CHEM 2019. [DOI: 10.1039/c9nj03422f] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
First photocatalytic synthesis of acetals using DMSO as a “methylene” source.
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Affiliation(s)
- Ranadeep Talukdar
- Molecular Synthesis and Drug Discovery Laboratory
- Centre of Biomedical Research
- Sanjay Gandhi Postgraduate Institute of Medical Sciences
- Lucknow-226014
- India
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Janssens J, Risseeuw MDP, Van der Eycken J, Van Calenbergh S. Regioselective Ring Opening of 1,3-Dioxane-Type Acetals in Carbohydrates. European J Org Chem 2018. [DOI: 10.1002/ejoc.201801245] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Affiliation(s)
- Jonas Janssens
- Laboratory for Medicinal Chemistry; Department of Pharmaceutics (FFW); Ghent University; Ottergemsesteenweg 460 9000 Ghent Belgium
- Laboratory for Organic and Bioorganic Synthesis; Department of Organic and Macromolecular Chemistry; Ghent University; Krijgslaan 281 (S4) 9000 Ghent Belgium
| | - Martijn D. P. Risseeuw
- Laboratory for Medicinal Chemistry; Department of Pharmaceutics (FFW); Ghent University; Ottergemsesteenweg 460 9000 Ghent Belgium
| | - Johan Van der Eycken
- Laboratory for Organic and Bioorganic Synthesis; Department of Organic and Macromolecular Chemistry; Ghent University; Krijgslaan 281 (S4) 9000 Ghent Belgium
| | - Serge Van Calenbergh
- Laboratory for Medicinal Chemistry; Department of Pharmaceutics (FFW); Ghent University; Ottergemsesteenweg 460 9000 Ghent Belgium
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Chapman RS, Francis M, Lawrence R, Tibbetts JD, Bull SD. Formyloxyacetoxyphenylmethane and 1,1-diacylals as versatile O-formylating and O-acylating reagents for alcohols. Tetrahedron 2018. [DOI: 10.1016/j.tet.2018.09.014] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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8
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Tian GZ, Hu J, Zhang HX, Rademacher C, Zou XP, Zheng HN, Xu F, Wang XL, Linker T, Yin J. Synthesis and conformational analysis of linear homo- and heterooligomers from novel 2-C-branched sugar amino acids (SAAs). Sci Rep 2018; 8:6625. [PMID: 29700416 PMCID: PMC5919921 DOI: 10.1038/s41598-018-24927-6] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2018] [Accepted: 04/05/2018] [Indexed: 11/09/2022] Open
Abstract
Sugar amino acids (SAAs), as biologically interesting structures bearing both amino and carboxylic acid functional groups represent an important class of multifunctional building blocks. In this study, we develop an easy access to novel SAAs in only three steps starting from nitro compounds in high yields in analytically pure form, easily available by ceric (IV) mediated radical additions. Such novel SAAs have been applied in the assembly of total nine carbopeptoids with the form of linear homo- and heterooligomers for the structural investigations employing circular dichroism (CD) spectroscopy, which suggest that the carbopeptoids emerge a well-extended, left (or right)-handed conformation similar to polyproline II (PPII) helices. NMR studies also clearly demonstrated the presence of ordered secondary structural elements. 2D-ROESY spectra were acquired to identify i+1 NH ↔ i C 1 H, i C 2 H correlations which support the conformational analysis of tetramers by CD spectroscopy. These findings provide interesting information of SAAs and their oligomers as potential scaffolds for discovering new drugs and materials.
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Affiliation(s)
- Guang-Zong Tian
- Key Laboratory of Carbohydrate Chemistry and Biotechnology, Ministry of Education, School of Biotechnology, Jiangnan University, Lihu Avenue 1800, Wuxi, Jiangsu, 214122, P.R. China
| | - Jing Hu
- Wuxi School of Medicine, Jiangnan University, Lihu Avenue 1800, Wuxi, Jiangsu, 214122, P.R. China.
| | - Heng-Xi Zhang
- Department of Biomolecular Systems, Max Planck Institute of Colloids and Interfaces, Am Mühlenberg 1, Potsdam, 14476, Germany
| | - Christoph Rademacher
- Department of Biomolecular Systems, Max Planck Institute of Colloids and Interfaces, Am Mühlenberg 1, Potsdam, 14476, Germany
| | - Xiao-Peng Zou
- Key Laboratory of Carbohydrate Chemistry and Biotechnology, Ministry of Education, School of Biotechnology, Jiangnan University, Lihu Avenue 1800, Wuxi, Jiangsu, 214122, P.R. China
| | - Hong-Ning Zheng
- Key Laboratory of Carbohydrate Chemistry and Biotechnology, Ministry of Education, School of Biotechnology, Jiangnan University, Lihu Avenue 1800, Wuxi, Jiangsu, 214122, P.R. China
| | - Fei Xu
- Key Laboratory of Carbohydrate Chemistry and Biotechnology, Ministry of Education, School of Biotechnology, Jiangnan University, Lihu Avenue 1800, Wuxi, Jiangsu, 214122, P.R. China
| | - Xiao-Li Wang
- Key Laboratory of Carbohydrate Chemistry and Biotechnology, Ministry of Education, School of Biotechnology, Jiangnan University, Lihu Avenue 1800, Wuxi, Jiangsu, 214122, P.R. China
| | - Torsten Linker
- Department of Chemistry, University of Potsdam, Karl-Liebknecht-Str. 24-25, Potsdam, 14476, Germany
| | - Jian Yin
- Key Laboratory of Carbohydrate Chemistry and Biotechnology, Ministry of Education, School of Biotechnology, Jiangnan University, Lihu Avenue 1800, Wuxi, Jiangsu, 214122, P.R. China.
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Niu Q, Xing L, Li C. From organocatalysed desilylations to high-yielding benzylidenations of electron-deficient benzaldehydes. JOURNAL OF CHEMICAL RESEARCH 2017. [DOI: 10.3184/174751917x14955339414758] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
A new type of organoprecatalyst (MeSCH2Cl/KI) for desilylation and benzylidenation reactions has been designed. Both reactions are user friendly and high yielding (71–>99%) and have fast reaction rates. The desilylation of iodo silyl ethers was achieved with no sequential etherification side reactions like those seen for reactions when using TBAF. In the application of the catalytic system to a 6-TBDMS ether of a glucoside, glucoside benzylidenations using electron-deficient benzaldehydes were achieved in 87% yield compared with the previously reported yields of 69–77%. Altogether, 14 benzylidenation reactions were realised using silyloxy alcohols and electron-deficient benzaldehydes instead of their activated acetal forms. In terms of reaction rates and yields, the order of the benzylidenations is p-fluorobenzaldehyde > benzaldehyde > p-anisaldehyde, and a possible mechanism is discussed. These experiments have preliminarily differentiated this cost-effective catalytic system from the classic Lewis acids.
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Affiliation(s)
- Qun Niu
- Department of Chemistry, School of Science, Tianjin University, 135 Yaguan Road, Jinnan District, Tianjin 300354, P.R. China
| | - Linlin Xing
- Department of Chemistry, School of Science, Tianjin University, 135 Yaguan Road, Jinnan District, Tianjin 300354, P.R. China
| | - Chunbao Li
- Department of Chemistry, School of Science, Tianjin University, 135 Yaguan Road, Jinnan District, Tianjin 300354, P.R. China
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Hou Z, Liu Y, Zhang XX, Chang XW, Cheng MS, Guo C. Synthesis of glucuronic acid derivatives via the efficient and selective removal of a C6 methyl group. Tetrahedron Lett 2017. [DOI: 10.1016/j.tetlet.2016.12.055] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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