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Stängle D, Silkenath B, Gehle P, Esser A, Mayer G, Wittmann V. Carba-Sugar Analogs of Glucosamine-6-Phosphate: New Activators for the glmS Riboswitch. Chemistry 2023; 29:e202202378. [PMID: 36326082 PMCID: PMC10099210 DOI: 10.1002/chem.202202378] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2022] [Indexed: 11/06/2022]
Abstract
Riboswitches are 5'-untranslated mRNA regions mostly found in bacteria. They are promising drug targets to overcome emerging bacterial resistance against commonly used antibiotics. The glmS riboswitch is unique among the family of riboswitches as it is a ribozyme that undergoes self-cleavage upon binding to glucosamine-6-phosphate (GlcN6P). Previously, we showed that carba glucosamine-6-phosphate (carba-GlcN6P) induces self-cleavage of the riboswitch with a potency similar to that of GlcN6P. Here, we report a synthetic approach to a new class of carba-GlcN6P derivatives with an alkoxy substituent in the carba position. Key features of the synthesis are a ring closing metathesis followed by a hydroboration. The strategy gives access to libraries of carba-GlcN6P derivatives. Ribozyme cleavage assays unraveled new activators for the glmS riboswitch from Listeria monocytogenes and Clostridium difficile.
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Affiliation(s)
- David Stängle
- Department of Chemistry, University of Konstanz, Universitätsstraße 10, 78464, Konstanz, Germany
| | - Bjarne Silkenath
- Department of Chemistry, University of Konstanz, Universitätsstraße 10, 78464, Konstanz, Germany
| | - Paul Gehle
- LIMES Institute, Center for Aptamer Research & Development, University of Bonn, Gerhard-Domagk-Straße 1, 53121, Bonn, Germany
| | - Anna Esser
- LIMES Institute, Center for Aptamer Research & Development, University of Bonn, Gerhard-Domagk-Straße 1, 53121, Bonn, Germany
| | - Günter Mayer
- LIMES Institute, Center for Aptamer Research & Development, University of Bonn, Gerhard-Domagk-Straße 1, 53121, Bonn, Germany
| | - Valentin Wittmann
- Department of Chemistry, University of Konstanz, Universitätsstraße 10, 78464, Konstanz, Germany
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2
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Mondal S, Tseng CJ, Tan JJY, Lin DY, Lin HY, Weng JH, Lin CH, Mong KKT. Tunable Strategy for the Asymmetric Synthesis of Sulfoglycolipids from Mycobacterium tuberculosis To Elucidate the Structure and Immunomodulatory Property Relationships. Angew Chem Int Ed Engl 2023; 62:e202212514. [PMID: 36349422 DOI: 10.1002/anie.202212514] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2022] [Indexed: 11/11/2022]
Abstract
We developed a versatile asymmetric strategy to synthesize different classes of sulfoglycolipids (SGLs) from Mycobacterium tuberculosis. The strategy features the use of asymmetrically protected trehaloses, which were acquired from the glycosylation of TMS α-glucosyl acceptors with benzylidene-protected thioglucosyl donors. The positions of the protecting groups at the donors and acceptors can be fine-tuned to obtain different protecting-group patterns, which is crucial for regioselective acylation and sulfation. In addition, a chemoenzymatic strategy was established to prepare the polymethylated fatty acid building blocks. The strategy employs inexpensive lipase as a desymmetrization agent in the preparation of the starting substrate and readily available chiral oxazolidinone as a chirality-controlling agent in the construction of the polymethylated fatty acids. A subsequent investigation on the immunomodulatory properties of each class of SGLs showed how the structures of SGLs impact the host innate immunity response.
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Affiliation(s)
- Soumik Mondal
- Applied Chemistry Department, National Yang Ming Chiao Tung University (Previously National Chiao Tung University), 1001, University Road, Hsinchu City, Taiwan, R. O. C
| | - Chieh-Jen Tseng
- Applied Chemistry Department, National Yang Ming Chiao Tung University (Previously National Chiao Tung University), 1001, University Road, Hsinchu City, Taiwan, R. O. C
| | - Janet Jia-Yin Tan
- Institute of Biological Chemistry, Academia Sinica, No.128, Academia Road Section2, Nan-Kang, Taipei, 11529, Taiwan
| | - Ding-Yuan Lin
- Applied Chemistry Department, National Yang Ming Chiao Tung University (Previously National Chiao Tung University), 1001, University Road, Hsinchu City, Taiwan, R. O. C
| | - Hsien-Ya Lin
- Institute of Biological Chemistry, Academia Sinica, No.128, Academia Road Section2, Nan-Kang, Taipei, 11529, Taiwan
| | - Jui-Hsia Weng
- Institute of Biological Chemistry, Academia Sinica, No.128, Academia Road Section2, Nan-Kang, Taipei, 11529, Taiwan
| | - Chun-Hung Lin
- Institute of Biological Chemistry, Academia Sinica, No.128, Academia Road Section2, Nan-Kang, Taipei, 11529, Taiwan.,Graduate Institute of Biotechnology and Biotechnology Center, National Chung-Hsing University, Taichung, 40227, Taiwan.,Department of Chemistry and Institute of Biochemical Sciences, National Taiwan University, Taipei, 10617, Taiwan
| | - Kwok-Kong Tony Mong
- Applied Chemistry Department, National Yang Ming Chiao Tung University (Previously National Chiao Tung University), 1001, University Road, Hsinchu City, Taiwan, R. O. C
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3
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Li W, Yu B. Temporary ether protecting groups at the anomeric center in complex carbohydrate synthesis. Adv Carbohydr Chem Biochem 2020; 77:1-69. [PMID: 33004110 DOI: 10.1016/bs.accb.2019.10.001] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
The synthesis of a carbohydrate building block usually starts with introduction of a temporary protecting group at the anomeric center and ends with its selective cleavage for further transformation. Thus, the choice of the anomeric temporary protecting group must be carefully considered because it should retain intact during the whole synthetic manipulation, and it should be chemoselectively removable without affecting other functional groups at a late stage in the synthesis. Etherate groups are the most widely used temporary protecting groups at the anomeric center, generally including allyl ethers, MP (p-methoxyphenyl) ethers, benzyl ethers, PMB (p-methoxybenzyl) eithers, and silyl ethers. This chapter provides a comprehensive review on their formation, cleavage, and applications in the synthesis of complex carbohydrates.
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Affiliation(s)
- Wei Li
- Department of Medicinal Chemistry, School of Pharmacy, China Pharmaceutical University, Nanjing, China.
| | - Biao Yu
- State Key Laboratory of Bio-organic and Natural Products Chemistry, Center for Excellence in Molecular Synthesis, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, Shanghai, China.
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Mifleur A, Ledru H, Lopes A, Suisse I, Mortreux A, Sauthier M. Synthesis of Short-Chain Alkenyl Ethers from Primary and Bio-sourced Alcohols via the Nickel-Catalyzed Hydroalkoxylation Reaction of Butadiene and Derivatives. Adv Synth Catal 2015. [DOI: 10.1002/adsc.201500721] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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5
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Kobayashi S, Sugiura M, Kitagawa H, Lam WWL. Rare-earth metal triflates in organic synthesis. Chem Rev 2002; 102:2227-302. [PMID: 12059268 DOI: 10.1021/cr010289i] [Citation(s) in RCA: 808] [Impact Index Per Article: 36.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Affiliation(s)
- Shū Kobayashi
- Graduate School of Pharmaceutical Sciences, The University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
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6
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Allylic protecting groups and their use in a complex environment part I: Allylic protection of alcohols. Tetrahedron 1997. [DOI: 10.1016/s0040-4020(97)00524-3] [Citation(s) in RCA: 134] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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7
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Endo T, Kajihara Y, Kodama H, Hashimoto H. Novel aspects of interaction between UDP-gal and GlcNAc beta-1,4-galactosyltransferase: transferability and remarkable inhibitory activity of UDP-(mono-O-methylated gal), UDP-Fuc and UDP-man. Bioorg Med Chem 1996; 4:1939-48. [PMID: 9007278 DOI: 10.1016/s0968-0896(96)00176-9] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
Four mono-O-methylated and one mono-O-acetylated UDP-D-Gal analogues and UDP-L-Fuc were synthesized. 2-O-Methyl-D-galactose residue was enzymatically transferred to give 2'-O-methyllactosaminide in high yield. UDP-Fuc and UDP-Man showed potent inhibitory activities against beta-1,4-galactosyltransferase. Structural requirement and steric allowance for the ground and transition states of the enzyme reaction were discussed.
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Affiliation(s)
- T Endo
- Department of Life Science, Faculty of Bioscience and Biotechnology, Tokyo Institute of Technology, Yokohama, Japan
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8
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Shvets VI. The synthesis of 1-O-(2-N-stearoyl-D-erythro-sphinganine-1-phosphoryl)-2-O- (alpha-D-mannopyranosyl-D-myo-inositol: a fragment of the naturally occurring inositol-containing glycophosphosphingolipids. Chem Phys Lipids 1995; 76:225-40. [PMID: 7634363 DOI: 10.1016/0009-3084(95)02446-p] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
Chiral mannosylinositol containing sphingophospholipid was synthesized from D-erythro ceramide and optically active mannosyl-myo-inositol with the use of phosphite triester coupling procedure. The optical resolution of racemic 3,4,5,6-tetra-O-benzyl-myo-inositol to enantiomers was accomplished via diastereomeric menthoxyacetic esters. Iodonium ion-promoted glycosylation has been used for the preparation of chiral mannosyl-myo-inositol. Bis(diisopropylamino)-2-cyanoethylphosphine has been applied to the introduction of the phosphodiester bond between the primary hydroxyl function of D-erythro-3-O-benzoylceramide and the secondary hydroxyl group of optically active and partially benzylated 1-O-(2-O-alpha-D-mannopyranosyl)- D-myo-inositol.
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9
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Desai T, Gigg J, Gigg R, Martín-Zamora E. The preparation of intermediates for the synthesis of 1D-myo-inositol 1,4,5- and 2,4,5-trisphosphates, 1,4-bisphosphate 5-phosphorothioate, and 4,5-bisphosphate 1-phosphorothioate from 1D-3,6-di-O-benzyl-1,2-O-isopropylidene-myo-inositol. Carbohydr Res 1994; 262:59-77. [PMID: 7954520 DOI: 10.1016/0008-6215(94)84005-9] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
The preparation of 1D-1,6-di-O-benzyl-2,5-di-O-p-methoxybenzyl-myo-inositol is described. This compound and 1D-3,6-di-O-benzyl-1,2-O-isopropylidene-myo-inositol were converted into 1D-1,3,6-tri-O-benzyl-myo-inositol which was phosphorylated to give an intermediate for the synthesis of 1D-myo-inositol 2,4,5-trisphosphate. 1D-3,6-Di-O-benzyl-1,2-O-isopropylidene-myo-inositol was converted into 1D-2,3,6-tri-O-benzyl-myo-inositol (an intermediate for the synthesis of 1D-myo-inositol 1,4,5-trisphosphate) and 1D-2,3,6-tri-O-benzyl-1-O-p-methoxybenzyl-myo-inositol (an intermediate for the synthesis of the 1-phosphorothioate analogue of 1D-myo-inositol 1,4,5-trisphosphate). 1D-3,6-Di-O-benzyl-1,2-O-isopropylidene-myo-inositol was also converted into 1D-2,3,6-tri-O-benzyl-5-O-p-methoxybenzyl[and -5-O(cis-prop-1-enyl)]-myo- inositol both of which are intermediates for the synthesis of the 5-phosphorothioate analogue of 1D-myo-inositol 1,4,5-trisphosphate. The synthesis of 1D-2,3,6-tri-O-benzyl-myo-inositol 1,4-bis(dibenzyl phosphate) 5-(dibenzyl phosphorothioate) from 1D-2,3,6-tri-O-benzyl-myo-inositol 1,4-bis(dibenzyl phosphate) is described.
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Affiliation(s)
- T Desai
- Laboratory of Lipid and General Chemistry, National Institute for Medical Research, London, United Kingdom
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10
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11
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Desai T, Gigg J, Gigg R, Payne S, Penades S. The preparation of intermediates for the synthesis of 1D-myo-inositol 1,4,5-trisphosphate, a second messenger for signal transduction in cells. Carbohydr Res 1992; 234:1-21. [PMID: 1468077 DOI: 10.1016/0008-6215(92)85035-x] [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: 12/27/2022]
Abstract
Racemic 1,2,4-tri-O-benzyl-5,6-O-isopropylidene-myo-inositol was prepared by a new route involving crotyl (but-2-enyl) ethers and converted into the (-)-omega-camphanates to give the pure crystalline 1L-diastereoisomer and the chirally impure, syrupy 1D-diastereoisomer. The latter was converted via the 1-O-allyl or 1-O-p-methoxybenzyl ethers into chirally pure 1D-2,3,6-tri-O-benzyl-myo-inositol [required as an intermediate for the synthesis of 1D-myo-inositol 1,4,5-trisphosphate (1,4,5-IP3)], which was also prepared by de-p-methoxybenzylation of 1D-2,3,6-tri-O-benzyl-1,5-di-O-p-methoxybenzyl-myo-inositol. Racemic 2,4-di-O-benzyl-5,6-O-isopropylidene-1-O-p-methoxybenzyl-myo-inositol was prepared in a similar way to the analogous tribenzyl ether (using crotyl ethers) and the omega-camphanate esters behaved similarly, allowing efficient resolution by crystallisation of the (-)- and (+)-omega-camphanates. Racemic 1,2,4-tri-O-allyl-3-O-(but-2-enyl)-myo-inositol was resolved via the (-)-omega-camphanates and was also converted into 1,2,4-tri-O-(cis-prop-1-enyl)-myo-inositol, an alternative intermediate for the synthesis of 1,4,5-IP3.
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Affiliation(s)
- T Desai
- Laboratory of Lipid and General Chemistry, National Institute for Medical Research, Mill Hill, London, United Kingdom
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12
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Slaghek TM, Maas AA, Kamerling JP, Vliegenthart JF. Synthesis of two phosphate-containing "heptasaccharide" fragments of the capsular polysaccharides of Streptococcus pneumoniae types 6A and 6B. Carbohydr Res 1991; 211:25-39. [PMID: 1773430 DOI: 10.1016/0008-6215(91)84143-3] [Citation(s) in RCA: 22] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
The "heptasaccharides" O-alpha-D-galactopyranosyl-(1----3)- O-alpha-D-glucopyranosyl-(1----3)-alpha, beta-L-rhamnopyranose 2''-[O-alpha-D-galactopyranosyl-(1----3)-O-alpha-D-glucopyranosyl- (1----3)-O-alpha-L-rhamnopyranosyl-(1----3)-D-ribit-5-yl sodium phosphate] (25) and O-alpha-D-galactopyranosyl- (1----3)-O-alpha-D-glucopyranosyl-(1----3)-alpha, beta-L-rhamnopyranose 2''-[O-alpha-D-galactopyranosyl-(1----3)-O-alpha-D-glucopyranosyl- (1----3)-O-alpha-L-rhamnopyranosyl-(1----4)-D-ribit-5-yl sodium phosphate] (27), which are structural elements of the capsular polysaccharides of Streptococcus pneumoniae types 6A and 6B ([----2)- -alpha-D-Galp-(1----3)-alpha-D-Glcp-(1----3)-alpha-L-Rhap- (1----X)-D-RibOH-(5-P----]n; 6A X = 3, 6B X = 4), respectively, have been synthesized. 2,4-Di-O-acetyl- 3-O-[2,4,6-tri-O-acetyl-3-O-(2,3,4,6-tetra-O-acetyl-alpha-D- galactopyranosyl)-alpha-D-glucopyranosyl]-alpha-L-rhamnopyranosyl trichloroacetimidate (13) was coupled with 5-O-allyloxycarbonyl-1,2,4-tri-O- benzyl-D-ribitol (10), using trimethylsilyl triflate as a promotor (----14), and deallyloxycarbonylation (----15) and conversion into the corresponding triethylammonium phosphonate then gave 16. Condensation of 16 with 4-methoxybenzyl 2,4-di-O-benzyl-3-O-[2,4,6-tri-O-benzyl-3-O-(3,4,6-tri-O-benzyl-alpha-D- galactopyranosyl)-alpha-D-glucopyranosyl]- alpha-L-rhamnopyranoside (22) followed by oxidation and deprotection afforded 25. 5-O-Allyl-1-O-allyloxycarbonyl-2,3-di-O-benzyl-D-ribitol (12) was coupled with 13, using trimethylsilyl triflate as a promoter, the resulting tetrasaccharide-alditol derivative 17 was deallyloxycarbonylated (----18), acetylated (----19), and deallylated (----20), and the product was converted into the triethylammonium phosphonate derivative 21. Condensation of 21 with 22 followed by oxidation and deprotection afforded 27.
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Affiliation(s)
- T M Slaghek
- Department of Bio-Organic Chemistry, Utrecht University, The Netherlands
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13
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van Boeckel C, van Boom J. Synthesis of phosphatidyl-α-glucosyl glycerol containing a dioleoyl phosphatidyl moiety. Application of the tetraisopropyldisiloxane-1,3-diyl (tips) protecting group in sugar chemistry. part III. Tetrahedron 1985. [DOI: 10.1016/s0040-4020(01)82349-8] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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14
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15
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16
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Durette PL, Meitzner EP. Synthesis of 2-methyl-[2-acetamido-4-O-acetyl-6-O-benzyl-3-O-(2-butenyl)-1,2-dideoxy-alpha-D -glucopyrano]-[2,1-d]-2-oxazoline, a versatile intermediate for the synthesis of complex oligosaccharides of bacterial cell-wall, human milk, and blood-group substances. Carbohydr Res 1981; 89:279-88. [PMID: 7237481 DOI: 10.1016/s0008-6215(00)85253-2] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Abstract
2-Methyl-[2-acetamido-4-O-acetyl-6-O-benzyl-3-O-(2-butenyl)-1,2-dideoxy-alpha-D-glucopyrano]-[2,1-d]-2-oxazoline (2), a glycosylating agent in which the three hydroxyl groups are blocked with protecting groups of differing "persistence", is of utility in the synthesis of oligosaccharides containing highly branched 2-acetamido-2-deoxy-D-glucosyl residues, and it was synthesized in a ten-step sequence from 2-acetamido-2-deoxy-D-glucose via allyl 2-acetamido-4,6-O-benzylidene-2-deoxy-beta-D-glucopyranoside (3). Alkylation of 3 with 2-butenyl (crotyl) bromide, hydrolysis of the benzylidene acetal group, benzylation of the 6-hydroxyl group, and acetylation of the 4-hydroxyl group afforded allyl 2-acetamido-4-O-acetyl-6-O-benzyl-3-O-(2-butenyl)-2-deoxy-beta-D-glucopyranoside(10). Treatment of 10 with chlorotris(tri-phenylphosphine)rhodium(I) gave mainly the corresponding 1-propenyl beta-glycoside, which was converted into oxazoline 2 by the action of mercuric chloride-mercuric oxide in acetonitrile. Glycosylation of benzyl 2-acetamido-3,6-di-O-benzyl-2-deoxy-alpha-D-glucopyranoside with 2, and subsequent O-deacetylation at O-4' gave a glycosyl acceptor, benzyl 2-acetamido-4-O-[2-acetamido-6-O-benzyl-3-O-(2-butenyl) -2-deoxy-beta-D-glucopyranosyl]-3,6-di-O-benzyl-2-deoxy-alpha-D-glucopyranoside .
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17
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18
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Abstract
The chemical syntheses of naturally occurring glycolipids derived from sphingosine bases and glycerol derivatives, and the syntheses of polyisoprenoid lipid intermediates and other miscellaneous glycolipids recorded up to the end of 1977 are reviewed.
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19
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Synthesis of phosphatidyl-α-glucosyl-diacylglycerol containing palmitic and oleic acid esters. Tetrahedron Lett 1980. [DOI: 10.1016/s0040-4039(00)78751-x] [Citation(s) in RCA: 45] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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20
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A. Nashed M. An improved method for selective substitution on O-3 of D-mannose. Application to the synthesis of methyl 3-O-methyl-and 2-O-α-Dmannopyranosides. Carbohydr Res 1978. [DOI: 10.1016/s0008-6215(00)83479-5] [Citation(s) in RCA: 61] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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21
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Nashed MA, Slife CW, Kiso M, Anderson L. A new reaction of the 1-propenyl glycosides of 2-acetamido-2-deoxy-β-d-glucopyranose: direct conversion into oxazolines. Carbohydr Res 1977. [DOI: 10.1016/s0008-6215(00)84384-0] [Citation(s) in RCA: 22] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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22
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Nashed MA, Anderson L. O-Benzylated thio sugars. Derivatives of 2,3,6-tri-O-benzyl-1-thio-d-galactopyranose suitable for use in oligosaccharide synthesis. Carbohydr Res 1977. [DOI: 10.1016/s0008-6215(00)83353-4] [Citation(s) in RCA: 26] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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23
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Nashed MA, Anderson L. Selective substitution at the 3-position in a 3,4-O-dibutylstannylene-d-galactopyranose derivative. An improved synthesis of 2,4,6-tri-O-benzyl-d-galactose. Carbohydr Res 1977. [DOI: 10.1016/s0008-6215(00)83367-4] [Citation(s) in RCA: 26] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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24
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Nashed MA, Anderson L. O-benzylated thio sugars: 2,3,4- and 2,4,6-tri-O-benzyl-1-thio-β-d-galactopyranose. Carbohydr Res 1976. [DOI: 10.1016/s0008-6215(00)84036-7] [Citation(s) in RCA: 18] [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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25
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26
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Organotin derivatives and the selective acylation and alkylation of the equatorial hydroxy group in a vicinal, equatorial-axial pair. Tetrahedron Lett 1976. [DOI: 10.1016/s0040-4039(00)71342-6] [Citation(s) in RCA: 117] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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27
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Abstract
Starting from allyl 3-O-benzyl-4,6-O-benzylidene-alpha-D-glucopyranoside as a key intermediate, the following crystalline compounds were prepared: 2-O-allyl-3,4,6-tri-O-benzyl-D-glucopyranose (11) and its p-nitrobenzoate; 2,3,5-tri-O-benzyl-D-arabinofuranose (12) and the corresponding arabinitol; allyl 3,4,6-tri-O-benzyl-alpha-D-glucopyranoside (7); 3,4,6-tri-o-benzyl-D-glucopyranose (8); 2-0-allyl 3, 4-di-o-benzyl-D-glucopyranose (17) and its bis(p-nitrobenzoate); and 3,4-di-O-benzyl-D-glucopyranose (19). The p-nitrobenzoates of compounds 11 and 17 are potential intermediates for the synthesis of the glycolipids of the cytoplasmic membranes of Streptococci.
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28
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Dmitriev BA, Chernyak AY, Bairamova N�. Synthesis of 3-O-?-L-rhamnopyeanosyl-D-galactopyranose. Russ Chem Bull 1975. [DOI: 10.1007/bf00926308] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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29
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Jeanloz DA, Jeanloz RW. Synthesis of the 6-methyl and 3,6- and 4,6-dimethyl ethers of methyl 2-acetamido-2-deoxy-alpha-D-mannopyranoside. Carbohydr Res 1974; 38:205-16. [PMID: 4447938 DOI: 10.1016/s0008-6215(00)82351-4] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
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30
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Kochetkov NK, Dmitriev BA, Chernyak AY, Bairamova N�. Synthesis of bacterial antigenic polysaccharides and their fragments. Russ Chem Bull 1974. [DOI: 10.1007/bf00921295] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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Kochetkov NK, Dmitriev BA, Chizhov OS, Klimov EM, Malysheva NN, Torgov VI, Chernyak AY, Bairamova NE. Synthesis of bacterial antigenic polysaccharides and their fragments. ACTA ACUST UNITED AC 1974. [DOI: 10.1007/bf00923102] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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