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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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Wojaczyńska E, Steppeler F, Iwan D, Scherrmann MC, Marra A. Synthesis and Applications of Carbohydrate-Based Organocatalysts. Molecules 2021; 26:7291. [PMID: 34885873 PMCID: PMC8659088 DOI: 10.3390/molecules26237291] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2021] [Revised: 11/22/2021] [Accepted: 11/24/2021] [Indexed: 12/22/2022] Open
Abstract
Organocatalysis is a very useful tool for the asymmetric synthesis of biologically or pharmacologically active compounds because it avoids the use of noxious metals, which are difficult to eliminate from the target products. Moreover, in many cases, the organocatalysed reactions can be performed in benign solvents and do not require anhydrous conditions. It is well-known that most of the above-mentioned reactions are promoted by a simple aminoacid, l-proline, or, to a lesser extent, by the more complex cinchona alkaloids. However, during the past three decades, other enantiopure natural compounds, the carbohydrates, have been employed as organocatalysts. In the present exhaustive review, the detailed preparation of all the sugar-based organocatalysts as well as their catalytic properties are described.
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Affiliation(s)
- Elżbieta Wojaczyńska
- Faculty of Chemistry, Wrocław University of Science and Technology, Wybrzeże Wyspiańskiego 27, 50 370 Wrocław, Poland
| | - Franz Steppeler
- Faculty of Chemistry, Wrocław University of Science and Technology, Wybrzeże Wyspiańskiego 27, 50 370 Wrocław, Poland
| | - Dominika Iwan
- Faculty of Chemistry, Wrocław University of Science and Technology, Wybrzeże Wyspiańskiego 27, 50 370 Wrocław, Poland
| | - Marie-Christine Scherrmann
- Institut de Chimie Moléculaire et des Matériaux d'Orsay (ICMMO), Université Paris-Saclay, Bâtiment 420, 91405 Orsay, France
| | - Alberto Marra
- Institut des Biomolécules Max Mousseron (IBMM-UMR 5247), Université de Montpellier, Pôle Chimie Balard Recherche, 1919 Route de Mende, 34293 Montpellier, France
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3
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Tong G, Ding Z, Liu Z, Ding YS, Xu L, Zhang H, Li P. Total Synthesis of Prostratin, a Bioactive Tigliane Diterpenoid: Access to Multi-Stereocenter Cyclohexanes from a Phenol. J Org Chem 2020; 85:4813-4837. [DOI: 10.1021/acs.joc.0c00022] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Affiliation(s)
- Guanghu Tong
- Frontier Institute of Science and Technology, Xi’an Jiaotong University, Xi’an 710054, China
| | - Zhengwei Ding
- Frontier Institute of Science and Technology, Xi’an Jiaotong University, Xi’an 710054, China
| | - Zhi Liu
- Frontier Institute of Science and Technology, Xi’an Jiaotong University, Xi’an 710054, China
| | - You-Song Ding
- Frontier Institute of Science and Technology, Xi’an Jiaotong University, Xi’an 710054, China
| | - Liang Xu
- School of Chemistry and Chemical Engineering/Key Laboratory for Green Processing of Chemical Engineering of Xinjiang Bingtuan, Shihezi University, Shihezi 832003, China
| | - Hailong Zhang
- Department of Medicinal Chemistry, School of Pharmacy, Xi’an Jiaotong University, Xi’an, 710061, China
| | - Pengfei Li
- Frontier Institute of Science and Technology, Xi’an Jiaotong University, Xi’an 710054, China
- Xi’an Key Laboratory of Sustainable Energy Materials Chemistry, Xi’an Jiaotong University, Xi’an 710049, China
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Jana A, Mondal S, Ghosh S. Studies towards the synthesis of bielschowskysin. Construction of the highly functionalized bicyclo[3.2.0]heptane segment. Org Biomol Chem 2015; 13:1846-59. [DOI: 10.1039/c4ob02182g] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A stereocontrolled approach for the construction of a highly functionalized bicyclo[3.2.0]heptane derivative embodying the bridged lactone present in the diterpene bielschowskysin is reported.
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Affiliation(s)
- Anupam Jana
- Department of Organic Chemistry
- Indian Association for the Cultivation of Science
- Jadavpur
- India
| | - Sujit Mondal
- Department of Organic Chemistry
- Indian Association for the Cultivation of Science
- Jadavpur
- India
| | - Subrata Ghosh
- Department of Organic Chemistry
- Indian Association for the Cultivation of Science
- Jadavpur
- India
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5
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Wan ZL, Zhang GL, Chen HJ, Wu Y, Li Y. A Chiral Pool and Cross Metathesis Based Synthesis of Gingerdiols. European J Org Chem 2014. [DOI: 10.1002/ejoc.201301727] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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6
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Sundell R, Kanerva LT. Lipases in the Regioselective Preparation of Glyceric Acid Esters of Methyl Glycosides. European J Org Chem 2013. [DOI: 10.1002/ejoc.201300450] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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7
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Jana A, Mondal S, Firoj Hossain M, Ghosh S. Stereocontrolled approach to the highly functionalized bicyclo[3.2.0] heptane core of bielschowskysin through intramolecular Cu(I)-catalyzed [2+2] photocycloaddition. Tetrahedron Lett 2012. [DOI: 10.1016/j.tetlet.2012.10.018] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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8
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Fujioka H, Nakahara K, Kotoku N, Ohba Y, Nagatomi Y, Wang TL, Sawama Y, Murai K, Hirano K, Oki T, Wakamatsu S, Kita Y. Asymmetric Total Synthesis of (−)-Stenine and 9a-epi-Stenine. Chemistry 2012; 18:13861-70. [DOI: 10.1002/chem.201200376] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2012] [Revised: 07/14/2012] [Indexed: 11/11/2022]
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Anderson K, Sizovs A, Cortez M, Waldron C, Haddleton DM, Reineke TM. Effects of trehalose polycation end-group functionalization on plasmid DNA uptake and transfection. Biomacromolecules 2012; 13:2229-39. [PMID: 22616977 DOI: 10.1021/bm300471n] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
In this study, we have synthesized six analogs of a trehalose-pentaethylenehexamine glycopolymer (Tr4) that contain (1A) adamantane, (1B) carboxy, (1C) alkynyl-oligoethyleneamine, (1D) azido trehalose, (1E) octyl, or (1F) oligoethyleneamine end groups and evaluated the effects of polymer end group chemistry on the ability of these systems to bind, compact, and deliver pDNA to cultured HeLa cells. The polymers were synthesized in one-pot azide-alkyne cycloaddition reactions with an adaptation of the Carothers equation for step-growth polymerization to produce a series of polymers with similar degrees of polymerization. An excess of end-capping monomer was added at the end of the polymerizations to maximize functionalization efficiency, which was evaluated with GPC, NMR, and MALDI-TOF. The polymers were all found to bind and compact pDNA at similarly low N/P ratios and form polyplexes with plasmid DNA. The effects of the different end group structures were most evident in the polyplex internalization and transfection assays in the presence of serum as determined by flow cytometry and luciferase gene expression, respectively. The Tr4 polymers end-capped with carboxyl groups (1B) (N/P = 7), octyne (1E) (N/P = 7), and oligoethyleneamine (1F) (N/P = 7), were taken into cells as polyplex and exhibited the highest levels of fluorescence, resulting from labeled plasmid. Similarly, the polymers end-functionalized with carboxyl groups (1E at N/P = 7), octyl groups (1E at N/P = 15), and in particular oligoethyleneamine groups (1F at N/P = 15) yielded dramatically higher reporter gene expression in the presence of serum. This study yields insight into how very subtle structural changes in polymer chemistry, such as end groups can yield very significant differences in the biological delivery efficiency and transgene expression of polymers used for pDNA delivery.
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Affiliation(s)
- Kevin Anderson
- Department of Chemistry, University of Minnesota, Minneapolis, Minnesota 55455, United States
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Nakahara K, Hirano K, Maehata R, Kita Y, Fujioka H. Asymmetric Total Synthesis of Clavolonine. Org Lett 2011; 13:2015-7. [DOI: 10.1021/ol200376z] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Affiliation(s)
- Kenji Nakahara
- Graduate School of Pharmaceutical Sciences, Osaka University, 1-6 Yamada-oka, Suita, Osaka, 565-0871 Japan
| | - Kie Hirano
- Graduate School of Pharmaceutical Sciences, Osaka University, 1-6 Yamada-oka, Suita, Osaka, 565-0871 Japan
| | - Ryota Maehata
- Graduate School of Pharmaceutical Sciences, Osaka University, 1-6 Yamada-oka, Suita, Osaka, 565-0871 Japan
| | - Yasuyuki Kita
- Graduate School of Pharmaceutical Sciences, Osaka University, 1-6 Yamada-oka, Suita, Osaka, 565-0871 Japan
| | - Hiromichi Fujioka
- Graduate School of Pharmaceutical Sciences, Osaka University, 1-6 Yamada-oka, Suita, Osaka, 565-0871 Japan
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11
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Wang B, Wu XY, Wong OA, Nettles B, Zhao MX, Chen D, Shi Y. A diacetate ketone-catalyzed asymmetric epoxidation of olefins. J Org Chem 2009; 74:3986-9. [PMID: 19388627 PMCID: PMC2749516 DOI: 10.1021/jo900330n] [Citation(s) in RCA: 59] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
A fructose-derived diacetate ketone has been shown to be an effective catalyst for asymmetric epoxidation. High ee values have been obtained for a variety of trans and trisubstituted olefins including electron-deficient alpha,beta-unsaturated esters as well as certain cis olefins.
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Affiliation(s)
- Bin Wang
- Department of Chemistry, Colorado State University, Fort Collins, CO 80523
| | - Xin-Yan Wu
- Department of Chemistry, Colorado State University, Fort Collins, CO 80523
| | - O. Andrea Wong
- Department of Chemistry, Colorado State University, Fort Collins, CO 80523
| | - Brian Nettles
- Department of Chemistry, Colorado State University, Fort Collins, CO 80523
| | - Mei-Xin Zhao
- Department of Chemistry, Colorado State University, Fort Collins, CO 80523
| | - Dajun Chen
- Department of Chemistry, Colorado State University, Fort Collins, CO 80523
| | - Yian Shi
- Department of Chemistry, Colorado State University, Fort Collins, CO 80523
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12
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Facile formation of tetrahydrofurans with multiple chiral centers using double iodoetherification of σ-symmetric diene acetals: short asymmetric total synthesis of rubrenolide and rubrynolide. Tetrahedron 2008. [DOI: 10.1016/j.tet.2008.02.088] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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13
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Lang M, Ziegler T. Synthesis of Both Enantiomers of Conduritol C Tetraacetate and ofmeso-Conduritol D Tetraacetate by Oxidation of Benzoquinone Bis(ethylene acetal). European J Org Chem 2007. [DOI: 10.1002/ejoc.200600764] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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14
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Attolino E, Catelani G, D’Andrea F. Regiospecific Synthesis of 4-Deoxy-D-threo-hex-3-enopyranosides by Simultaneous Activation–Elimination of the Talopyranoside Axial 4-OH with the NaH/Im2SO2 System: Manifestation of the Stereoelectronic Effect. European J Org Chem 2006. [DOI: 10.1002/ejoc.200600526] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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15
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Sasaki M, Tsubone K, Shoji M, Oikawa M, Shimamoto K, Sakai R. Design, total synthesis, and biological evaluation of neodysiherbaine A derivative as potential probes. Bioorg Med Chem Lett 2006; 16:5784-7. [PMID: 16949819 DOI: 10.1016/j.bmcl.2006.08.082] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2006] [Revised: 08/14/2006] [Accepted: 08/17/2006] [Indexed: 10/24/2022]
Abstract
To enable studies to elucidate the detailed biological function of dysiherbaine and neodysiherbaine A, potent and subunit-selective agonists for ionotropic glutamate receptors, the derivative with a hydroxymethyl substituent at the C10 position has been developed. Preliminary biological evaluation of the analogue showed that a C10 hydroxymethyl substituent produced significant alterations in binding affinities for the ionotropic glutamate receptor subtypes.
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Affiliation(s)
- Makoto Sasaki
- Laboratory of Biostructural Chemistry, Graduate School of Life Sciences, Tohoku University, Sendai 981-8555, Japan.
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16
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Fujioka H, Ohba Y, Hirose H, Murai K, Kita Y. A double iodoetherification of sigma-symmetric diene acetals for installing four stereogenic centers in a single operation: short asymmetric total synthesis of rubrenolide. Angew Chem Int Ed Engl 2006; 44:734-7. [PMID: 15612067 DOI: 10.1002/anie.200461584] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Hiromichi Fujioka
- Graduate School of Pharmaceutical Sciences, Osaka University, 1-6 Yamadaoka, Suita, Osaka 565-0871, Japan.
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Abstract
We reported that dicyanoketene acetals (DCKA), in which gem-dicyano groups of tetracyanoethylene (TCNE) are displaced with alkoxyl groups, function as pi-acid catalysts, and that a polymer (poly-DCKA-1) derived by copolymerization of a monomer, in which the alkoxyl group at the omega-position is modified with a styrene moiety, with ethyleneglycol dimethacrylate also shows high level of activities as a pi-acid. In this research, the effects of dicyanoketene ethylene acetal (DCKEA), polymers previously developed (poly-DCKA-1 and 2), new monomers, in which the alkoxyl group at the omega-position is modified with an ethereal moiety, and the corresponding polymers (poly-DCKA-3 and 4) were investigated on catalytic activities. Among the catalysts, the polymer (poly-DCKA-1) had the most efficient activity in monothioacetalization, cyanation, and Mukaiyama aldol reaction of acetals, two-component and three-component Mannich-type reaction, hydrolysis of acetals and silyl ethers, and two-component and three-component inverse electron demand Aza-Diels-Alder reaction. Remarkably, the polymer catalyst works more efficiently in water than in organic solvents and is recyclable.
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Fujioka H, Ohba Y, Hirose H, Murai K, Kita Y. A Double Iodoetherification of ?-Symmetric Diene Acetals for Installing Four Stereogenic Centers in a Single Operation: Short Asymmetric Total Synthesis of Rubrenolide. Angew Chem Int Ed Engl 2005. [DOI: 10.1002/ange.200461584] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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20
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Chen MY, Patkar LN, Lu KC, Lee ASY, Lin CC. Chemoselective deprotection of acid labile primary hydroxyl protecting groups under CBr4-photoirradiation conditions. Tetrahedron 2004. [DOI: 10.1016/j.tet.2004.09.095] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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21
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Chen MY, Patkar LN, Jan MD, Lee ASY, Lin CC. CBr4-photoirradiation protocol for chemoselective deprotection of acid labile primary hydroxyl protecting groups. Tetrahedron Lett 2004. [DOI: 10.1016/j.tetlet.2003.10.205] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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23
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Dioxane-type (2-naphthyl)methylene acetals of glycosides and their hydrogenolytic transformation into 6-O- and 4-O-(2-naphthyl)methyl (NAP) ethers. Tetrahedron 2002. [DOI: 10.1016/s0040-4020(02)00515-x] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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24
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Preparation of (2-naphthyl)methylene acetals of glycosides and their hydrogenolytic transformation into 2-naphthylmethyl (NAP) ethers. Tetrahedron Lett 2000. [DOI: 10.1016/s0040-4039(00)00735-8] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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25
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Wachtmeister J, Mühlman A, Classon B, Kvarnström I, Hallberg A, Samuelsson B. Impact of the Central Hydroxyl Groups on the Activity of Symmetrical HIV-1 Protease Inhibitors Derived From l-Mannaric Acid. Tetrahedron 2000. [DOI: 10.1016/s0040-4020(00)00220-9] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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26
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Catelani G, D'Andrea F, Puccioni L. Selective deprotection of 2',6'-di-O-benzyl-2,3:5,6:3',4'-tri-O-isopropylidenelactose dimethyl acetal. Carbohydr Res 2000; 324:204-9. [PMID: 10724535 DOI: 10.1016/s0008-6215(99)00295-5] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
The reactivity order of O-deisopropylidenation of the three isopropylidene protecting groups of 2',6'-di-O-benzyl-2,3:5,6:3',4'-tri-O-isopropylidenelactose dimethyl acetal (2) with various reagents was established. The 5,6-acetal group was, although to a limited extent, more reactive as compared with the 3',4' group, while the 2,3-O-isopropylidene group was definitely less reactive. Conditions were determined for the direct preparation of the 5,6,3',4'-tetraol 5 (60% aqueous acetic acid, room temperature, 48 h, 73% yield) and the 5,6-diol 4 (propylene glycol and p-toluenesulphonic acid in dichloromethane, 46% yield). The diacetonated derivative 3, formally arising from a selective 3',4'-O-deisopropylidenation, was obtained in high yield (90%) through a selective acetonation with 2-methoxypropene of the tetraol 5.
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Affiliation(s)
- G Catelani
- Dipartimento di Chimica Bioorganica e Biofarmacia, Università di Pisa, Italy.
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27
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Catelani G, Osti F, Bianchi N, Bergonzi MC, D'Andrea F, Gambari R. Induction of erythroid differentiation of human K562 cells by 3-O-acyl-1,2-O-isopropylidene-D-glucofuranose derivatives. Bioorg Med Chem Lett 1999; 9:3153-8. [PMID: 10560743 DOI: 10.1016/s0960-894x(99)00547-8] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
Abstract
In this paper we report the synthesis of twelve 3-O-acyl-1,2-O-isopropylidene-D-glucofuranose derivatives and the results obtained on their effects in inducing erythroid differentiation of human leukemic K562 cells. The data obtained demonstrate that two of the newly synthetized compounds are able to induce erythroid differentiation of K562 cells. In addition, these same compounds potentiate K562 erythroid differentiation induced by cytosine arabinoside, retinoic acid and mithramycin. Inducers of erythroid differentiation stimulating fetal gamma-globin synthesis could be considered for possible use in the experimental therapy of hematological diseases associated with a failure in the expression of adult beta-globin genes.
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Affiliation(s)
- G Catelani
- Dipartimento di Chimica Bioorganica e Biofarmacia, Università di Pisa, Italy
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28
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Frank M, Miethchen R, Degenring D. d-Tagatose derivatives from d-fructose by a facile epimerisation procedure. Carbohydr Res 1999. [DOI: 10.1016/s0008-6215(99)00090-7] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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29
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Tu Y, Wang ZX, Frohn M, He M, Yu H, Tang Y, Shi Y. Structural Probing of Ketone Catalysts for Asymmetric Epoxidation. J Org Chem 1998. [DOI: 10.1021/jo9817218] [Citation(s) in RCA: 66] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Yong Tu
- Department of Chemistry, Colorado State University, Fort Collins, Colorado 80523
| | - Zhi-Xian Wang
- Department of Chemistry, Colorado State University, Fort Collins, Colorado 80523
| | - Michael Frohn
- Department of Chemistry, Colorado State University, Fort Collins, Colorado 80523
| | - Mingqi He
- Department of Chemistry, Colorado State University, Fort Collins, Colorado 80523
| | - Hongwu Yu
- Department of Chemistry, Colorado State University, Fort Collins, Colorado 80523
| | - Yong Tang
- Department of Chemistry, Colorado State University, Fort Collins, Colorado 80523
| | - Yian Shi
- Department of Chemistry, Colorado State University, Fort Collins, Colorado 80523
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Abstract
Tricolorin A (1), a structurally amazing resin glycoside with promising bioactivities from Ipomoea tricolor cav. (convolvulaceae), was synthesized in a total of 45 steps, with the longest linear sequence of 20 steps and overall yield of 0.65% from D-mannitol. The AB disaccharide 19-membered lactone 2 was constructured by a regioselective macrolactonization using Corey-Nicolaou protocol. The macrolactone tetrasaccharide 33 was realized either by "one-pot two-step" glycosylation procedure or by a stepwise assembly employing the "armed-disarmed" glycosylation strategy.
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Affiliation(s)
- Shou-Fu Lu
- State Key Laboratory of Bio-organic and Natural Products Chemistry, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, 354 Fenglin Road, Shanghai 200032, China
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31
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32
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Gonda J, Bednárikova M. Stereocontrol by intrinsic antiparallel double repulsion on diacetone-D-glucose template. Diastereoselective synthesis of 3(S)-isothiocyanato-3-deoxy-3-C-vinyl glucose via (3,3)-sigmatropic rearrangement of allylic thiocyanates. Tetrahedron Lett 1997. [DOI: 10.1016/s0040-4039(97)01246-x] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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33
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34
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Yadav J, Chandrasekhar S, Sumithra G, Kache R. Selective and unprecedented oxidative deprotection of allyl ethers with DDQ. Tetrahedron Lett 1996. [DOI: 10.1016/0040-4039(96)01478-5] [Citation(s) in RCA: 60] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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