176299-96-0Relevant academic research and scientific papers
Convergent Synthesis of Digalactosyl Diacylglycerols
Inuki, Shinsuke,Kishi, Junichiro,Kashiwabara, Emi,Aiba, Toshihiko,Fujimoto, Yukari
, p. 6482 - 6485 (2017)
Efficient convergent chemical syntheses of digalactosyl diacylglycerols (DGDGs), which have both a galactose-galactose α(1→6)-linkage and a galactose-glycerol β-linkage along with a diacylglycerol containing various kinds of fatty acids, have been accomplished. In order to achieve a concise synthesis, we chose to use allylic protective groups as permanent protective groups. We have also achieved α- and β-selective glycosylations for the respective linkages with high yields as the key steps.
Revealing Functional Significance of Interleukin-2 Glycoproteoforms Enabled by Expressed Serine Ligation
Zhao, Jie,Liu, Jiazhi,Liu, Xinnan,Cao, Qi,Zhao, Hongbo,Liu, Lizhen,Ye, Farong,Wang, Can,Shao, Hong,Xue, Dongxiang,Tao, Houchao,Li, Bin,Yu, Biao,Wang, Ping
supporting information, p. 787 - 793 (2022/01/31)
Naturally occurring interleukin-2 (IL-2) is a pleiotropic glycoprotein that regulates immune responses by controlling the differentiation and homeostasis of T cells. Non-glycosylated IL-2 has been used in clinical settings for three decades. However, the function of the O-glycan of native IL-2 remains elusive. Herein, to stress this issue, we report a highly efficient semi-synthesis of homogeneous glycosylated IL-2 with various glycoproteoforms on a multi-milligram scale. The glycopeptide fragment was prepared by chemical synthesis and then merged with recombinant fragment via a serine ligation to generate the desired glycoprotein in a single operation. Biological evaluation of the homogenous glycoprotein library reveals that the activity of IL-2 in activating individual T cell subset is glycan dependent, thus highlighting the possibility of further improving current clinical medicine.
Studies towards the total synthesis of repeating unit of O-sulfated polysaccharide from marine bacterium Cobetia pacifica KMM 3878
Pradhan, Kabita,Podilapu, Ananda Rao,Kulkarni, Suvarn S.
, p. 255 - 264 (2020/03/18)
Herein we report assembly of the appropriately protected trisaccharide repeating unit of Cobetia pacifica KMM 3878 O-sulfated polysaccharide. Our synthesis involves 3,4-O-pyruvilated galactose as the key building block which acts as a donor as well as acceptor in the construction of trisaccharide. We obtained the R isomer as a major stereoisomer in the pyruvilation reaction. The glycosylations proceeded with high stereo and regioselectivity.
HUMAN iNKT CELL ACTIVATION USING GLYCOLIPIDS WITH ALTERED GLYCOSYL GROUPS
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Paragraph 0288; 0293; 0294, (2015/03/16)
Glycosphingolipids (GSLs) bearing α-glucose (α-Glc) that preferentially stimulate human invariant NKT (iNKT) cells are provided. GSLs with α-glucose (α-Glc) that exhibit stronger induction in humans (but weaker in mice) of cytokines and chemokines and exp
Tuning the moenomycin pharmacophore to enable discovery of bacterial cell wall synthesis inhibitors
Gampe, Christian M.,Tsukamoto, Hirokazu,Doud, Emma H.,Walker, Suzanne,Kahne, Daniel
, p. 3776 - 3779 (2013/04/23)
New antibiotic drugs need to be identified to address rapidly developing resistance of bacterial pathogens to common antibiotics. The natural antibiotic moenomycin A is the prototype for compounds that bind to bacterial peptidoglycan glycosyltransferases
A divergent approach to the synthesis of simplexides and congeners via a late-stage olefin cross-metathesis reaction
Li, Jiakun,Li, Wei,Yu, Biao
supporting information, p. 4971 - 4974 (2013/08/23)
Simplexides constitute a unique group of immunosuppressive glycolipids that demonstrate antiproliferative activities against activated T-cell lymphocytes via a unique non-cytotoxic inhibition. To investigate the structure-activity relationship of the varied long-chain secondary alcohols on simplexides, we developed an efficient and divergent route to the synthesis of simplexides and congeners, taking advantage of a late-stage olefin cross-metathesis reaction.
Synthesis of a tetrasaccharide related to the triterpenoid saponin isolated from Schima noronhae
Verma, Priya,Raj, Ritu,Roy, Bimalendu,Mukhopadhyay, Balaram
experimental part, p. 2413 - 2418 (2010/12/25)
A concise synthesis of a tetrasaccharide related to the cell-growth inhibitory triterpenoid saponin isolated from Schima noronhae is reported. A late stage 2,2,6,6-tetramethylpiperidinyloxy (TEMPO)-mediated oxidation of a primary hydroxyl group to carboxylic acid has been achieved under phase-transfer conditions. Stereoselective glycosylations were carried out using thioglycoside or glycosyl trichloroacetimidate activation using sulfuric acid immobilized on silica (H2SO4-silica) in conjunction with N-iodosuccinimide and alone, respectively.
Efficient iodine-catalyzed preparation of benzylidene acetals of carbohydrate derivatives
Panchadhayee, Rajib,Kumar Misra, Anup
, p. 148 - 155 (2008/12/21)
An efficient preparation of benzylidene acetals of carbohydrate derivatives catalyzed by iodine has been developed. Yields were excellent in every case. Copyright Taylor & Francis Group, LLC.
Stereocontrolled and convergent entry to CF2-sialosides: Synthesis of CF2-linked ganglioside GM4
Hirai, Go,Watanabe, Toru,Yamaguchi, Kazunori,Miyagi, Taeko,Sodeoka, Mikiko
, p. 15420 - 15421 (2008/09/19)
Sialidase-resistant ganglioside analogues having biological activities similar to those of natural gangliosides are expected to be important probes for clarifying the biological functions of gangliosides. Focusing on difluoromethylene-linked (CF2-linked) α(2,3)sialylgalactose as a core structure of sialidase-resistant ganglioside mimics, we have developed novel, stereocontrolled, and efficient methodologies to synthesize CF2-sialosides based on Ireland-Claisen rearrangement. CF2-linked α(2,3)sialylgalactose and CF2-linked GM4 were synthesized. Copyright
Galabiosyl donors; efficient synthesis from 1,2,3,4,6-penta-O-acetyl-β-D-galactopyranose
Ohlsson, Joergen,Magnusson, Goeran
, p. 49 - 55 (2007/10/03)
1,2,3,4,6-Penta-O-acetyl-β-D-galactopyranose was transformed into phenyl 2,3,4,6-tetra-O-benzyl-1-thio-β-D-galactopyranoside (5) and 4-methoxyphenyl 2,3,6-tri-O-benzoyl-β-D-galactopyranoside (8) in 73% (two steps) and 58% (three steps) yield, respectively. Glycosylation of the acceptor 8 with donor 5 using N-iodosuccinimide-trimethylsilyl trifluoromethanesulfonate as promoter furnished the galabioside 9 (8.8 g) in 95% yield. Further transformations provided in high yields anomerically-activated galabiosides (thioglycoside (1), trichloroacetimidate (2), and bromosugar (3)) suitable for use as glycosyl donors in syntheses of galabiose-containing oligosaccharides. Several of the compounds reported here are crystalline, which greatly simplified purifications. (C) 2000 Elsevier Science Ltd.
