کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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1390882 | 983157 | 2007 | 6 صفحه PDF | دانلود رایگان |
Zeolite-catalyzed glycosylation of long-chain alcohols, using the inexpensive and readily available peracetylated β-d-gluco- and galactopyranoses as glycosyl donors under solvent free conditions, has been explored for the first time. Among the various forms (H-, Na-, Fe- and Zn) of β zeolite examined as catalysts in the reaction of 1,2,3,4,6-penta-O-acetyl-β-d-galactopyranose with cetyl alcohol, Fe-β zeolite gave the maximum yield of 63% of cetyl 2,3,4,6-tetra-O-acetyl-β-d-galactopyranoside and cetyl 3,4,6-tri-O-acetyl-α-d-galactopyranoside. Fe-β Zeolite-catalyzed glycosylation was found to be general affording the title compounds in each case in a moderate yield, but with a good stereoselectivity. The yield of synthetically valuable acetylated long-chain alkyl 1,2-cis C2-hydroxy-glycopyranosides obtained in the present single-step procedure is considerably higher than that of the previously reported multi-step method employing the Stork silicon tether approach.
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Journal: Carbohydrate Research - Volume 342, Issue 5, 9 April 2007, Pages 704–709