期刊
EUROPEAN JOURNAL OF ORGANIC CHEMISTRY
卷 2004, 期 16, 页码 3435-3446出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/ejoc.200400069
关键词
baccatin III; glycosidation; glycoconjugates; multistep synthesis; polymer-bound reagents; protecting group
Polymer-bound diphenylphosphane hydrobromide 2 shows excellent properties in the activation of enol ethers and glycals, the introduction and cleavage of THP ethers being promoted with excellent yields with this functionalized polymer. Glycosidations of glycals work equally well, with suppression of the formation of undesired Ferrier rearranged products. The reagent is sufficiently mild to leave labile 2-deoxy glycosidic bonds and acid-labile protecting groups intact. It can be employed to transfer disaccharide glycosyl donors onto aglycons and is also selective for the promotion of two glycosidations in one pot. Highly hindered glycosyl donor groups such as the hydroxy group at C-13 of the baccatin III framework can be glycosylated with glycals in the presence of this polymer-bound reagent. (C) Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2004.
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