全部文献期刊学位论文会议报纸专利标准年鉴图书|学者科研项目
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作者:Andras Liptak , Janos Kerekgyarto ...
来源:[J].Journal of Carbohydrate Chemistry(IF 0.847), 1988, Vol.7 (2), pp.337-357Taylor & Francis
摘要:Starting from L-rhamnose, benzyl 2,4-di-O-benzyl-6-deoxy-α-L-talopyranoside (7) was prepared by hydrogenolysis of a dioxolane-type benzylidene acetal and used as the aglycon to prepare 2-acetamido-2-deoxy-6-D-glucopyranosyl-(1-3)-6-deoxy-L-talose (13) and the title trisaccha...
作者:Andras Liptak , Lajos Szabo
来源:[J].Journal of Carbohydrate Chemistry(IF 0.847), 1989, Vol.8 (4), pp.629-644Taylor & Francis
摘要:Trimethylsilyl ethers of 2,3-di-O-substituted glycopyranosides or their thioglycopyranoside analogues were reacted with methyl pyruvate in the presence of trimethylsilyl triflate to give pyruvylated hexo-pyranosides in yields of 60-75%, and the ratio of the diastereoisomers was f...
作者:Andras Liptak , Lajot Szabo , Janos Harangi
来源:[J].Journal of Carbohydrate Chemistry(IF 0.847), 1988, Vol.7 (3), pp.687-699Taylor & Francis
摘要:Both anomers of methyl 1-thio-L-rhamnopyranosides were prepared through methylation of the corresponding isothiouronium salt. 2,3-0-Isopropylidene-, benzylidene-and the until now unknown diphenyl-methylene acetals were synthesized. Phase-transfer catalysed benzylation and Li...
作者:... Janos Hajko , Maria Kajtar-Peredy , Andras Liptak
来源:[J].Journal of Carbohydrate Chemistry(IF 0.847), 1993, Vol.12 (2), pp.191-200Taylor & Francis
摘要:A series of dioxolane-type diphenylmethylene acetals of pyranosides was converted into axial diphenylmethyl ethers in high yield using AlClH2 as the reducing agent. AlH3 did not cleave the acetals, AlCl2H regenerated both hydroxyl groups, and the intermediate diphenylmethyl ether...
作者:... Gabriella Szabovik , Maria Kajtar-Peredy , Andras Liptak
来源:[J].Journal of Carbohydrate Chemistry(IF 0.847), 1997, Vol.16 (7), pp.1123-1144Taylor & Francis
摘要:Series of dioxolane-type diphenylmethylene and fluoren-9-ylidene acetals of hexoses containing adjacent O-alkyl, deoxy or hydroxy functions were prepared and hydrogenolysed with the LiAlH4AlCl3 reagent. The observed direction of ring-cleavage was discussed in terms of different i...
作者:Gyongyi Gyemant , Andras Liptak
来源:[J].Journal of Carbohydrate Chemistry(IF 0.847), 1998, Vol.17 (3), pp.359-368Taylor & Francis
摘要:The product distribution of the iodine-catalyzed methyl glycosidation of four pentoses (D-ribose, D-arabinose, D-xylose, and D-lyxose) and two 6-deoxyhexoses (L-rhamnose, and D-fucose) was studied by HPLC using an APS column (dihydrogen sulphate form) with different acetonitrile-...
作者:... Erzsebet Farkas , Vince Pozsgay , Andras Liptak
来源:[J].Journal of Carbohydrate Chemistry(IF 0.847), 2000, Vol.19 (3), pp.285-310Taylor & Francis
摘要:Synthetic routes are described to zwitter-ionic disaccharides that are diastereoisomerically related to frame-shifted repeating units of the title polysaccharide that contains 2-acetamido-4-amino-2,4,6-trideoxy-D-galactose and 2-acetamido-2-deoxy-L-altruronic acid. The intermedia...

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