An Expeditious Route toStreptococciandEnterococciGlycolipidsViaRing-Opening of 1,2-Anhydrosugars with Protic Acids
作者:
C.M. Timmers,
N.C.R. van Straten,
G.A. van der Marel,
J.H. van Boom,
期刊:
Journal of Carbohydrate Chemistry
(Taylor Available online 1998)
卷期:
Volume 17,
issue 3
页码: 471-487
ISSN:0732-8303
年代: 1998
DOI:10.1080/07328309808002906
出版商: Taylor & Francis Group
数据来源: Taylor
摘要:
1,2-Anhydroglucose6reacts smoothly and with a high degree of stereoselectivity with a variety of carboxylic and phosphoric acids resulting in the formation of the predominantly β-oriented 1-O-acyl and 1-O-phosphorylglucoses7-17. This methodology has been successfully applied in the construction of glycolipids1a,b. Ring-opening of the 1,2-anhydroglucose derivative19with benzoic acid furnished exclusively the β-aligned key intermediate20. Subsequent ICDT-assisted chemoselective α-glucosylation of20with thioethyl donor21, followed by glycosidation of kojibiosyl benzoate22with glycerol acceptor23gave the fully protected α-diglucosyl glycerol derivative25, which upon desilylation (→28), acylation (→29 or 30) and deprotection afforded the target glycolipids1a-bin high overall yield.
点击下载:
PDF (940KB)
返 回