Demixing libraries of saccharides using a multi-linker approach in combination with a soluble polymeric support
摘要:
A new method for demixing libraries of compounds that are attached to a soluble polymeric support by tagging starting materials with selective cleavable linkers is described. (C) 2002 Elsevier Science Ltd. All rights reserved.
Hydrogenphosphonate synthesis of sugar phosphomonoesters
作者:Dmitry V. Yashunsky、Andrei V. Nikolaev
DOI:10.1039/b000727g
日期:——
A highly efficient procedure for the phosphorylation of sugar hydroxy derivatives has been developed. A four-step sequence comprising H-phosphonate formation, pivaloyl chloride-mediated coupling with fluoren-9-ylmethanol, oxidation, and cleavage of the fluoren-9-ylmethyl ester led to the sugar monophosphate derivatives 4a–g in 83–93% yield.
Synthesis of disaccharide methyl glycosides related to the polysaccharide from Klebsiella serotype 40 and a study of their inhibition in the precipitin reaction
作者:Usha B. Maddali、Asim K. Ray、Nirmolendu Roy
DOI:10.1016/0008-6215(90)80085-h
日期:1990.12
Galp (4), beta-L-Rhap-(1----3)-beta-D-Galp (5), beta-D-Galp-(1----2)-alpha-L-Rhap (6), and beta-D-GlcpA-(1----2)-alpha-L-Rhap (7) have been synthesised and their inhibition reactions in the Klebsiellaserotype 40 immune system have been studied. The results obtained accord with only one of two structures proposed for the repeating unit of the K40 antigen.
<i>p</i>-Methoxybenzyl Ether Cleavage by Polymer-Supported Sulfonamides
作者:Ronald J. Hinklin、Laura L. Kiessling
DOI:10.1021/ol025514c
日期:2002.4.1
[GRAPHICS]p-Methoxybenzyl ethers have been found to transfer from alcohols to sulfonamides in the presence of catalytic trifluoromethanesulfonic acid. This process for protecting group removal can be performed in solution with yields >94%. Through the use of sulfonamide-functionalized ("safety-catch") resins, p-methoxybenzyl ethers can be cleaved in excellent yields with minimal purification.
Highly regioselective alkylation of sugar hydroxyl groups has always been an important challenge in carbohydrate chemistry, especially for the selective alkylation of trans diols, there is no direct and efficient catalytic method so far. A chiral copper catalyzed universal highly site-selective alkylation of trans-diols method is realized. This reaction is performed under mild conditions and has broad