Synthesis Of Isomaltose Analogues
作者:
Klaus Bock,
Troels Skrydstrup,
Susanne Refn,
期刊:
Journal of Carbohydrate Chemistry
(Taylor Available online 1991)
卷期:
Volume 10,
issue 6
页码: 969-980
ISSN:0732-8303
年代: 1991
DOI:10.1080/07328309108543966
出版商: Taylor & Francis Group
数据来源: Taylor
摘要:
Preparation of the α-glucosides11, 12, 13and14were accomplished through glycosylation of racemictrans-1-hydroxy-2-(hydroxymethyl)cyclohexane using 2-thiopyridyl tetra-O-benzyl-glucoside as the glycosyl donor in acceptable overall yield for α-selectivity, but with poor regioselectivity. Glycosylation under thermodynamic control using tetrabenzyl glucopyranose acetate and trimethylsilyl triflate as the promotor gave similar results. The unprotected glucosides12and13were separated and characterized by NMR spectroscopy. Similarly methyl 4-deoxy-α-isomaltoside (5a) was prepared through halide catalyzed glycosylation of methyl 2,3-di-O-benzoyl-4-deoxy-α-D-glucopyranoside (15) in acceptable yield and the unprotected compound characterized by NMR spectroscopy. Compounds5a, 12a, 13aand the mixture11aand14awere all tested as substrates for the enzyme glucoamylase fromAspergillus nigerand proved to be very poor substrates for the enzymic hydrolysis.
点击下载:
PDF (553KB)
返 回