| Autor: |
Tao, Hong-Wen, Wang, Xia, Yi, Ping-Gui, Deng, Zhi-Hong, Yu, Xian-Yong, Li, Xiao-Fang |
| Zdroj: |
Chemical Papers; Aug2014, Vol. 68 Issue 8, p1132-1136, 5p |
| Abstrakt: |
A class of stereo-isomerically-pure alkanediol monoglycosides, 2-hydroxyethyl per- O-acetyl pyranosides ( IIIa-IIIf), was conveniently prepared by a one-pot reaction of per- O-acetylated pyranoses ( Ia-If) and 2-( tert-butyldimethylsilyloxy)ethanol ( II) with catalysis by BF·OEt. The α-( IIIa) or β-linked glycosides ( IIIb-IIIf) with 1,2- trans-configuration were obtained from glycosyl donors with participation of the neighbouring 2- O-acetyl group. BF·OEt, along with hydrogen fluoride released from BF·OEt under the experimental conditions used, facilitates the subsequent de-protection of siloxane to successfully afford 2-hydroxyethyl per- O-acetyl-pyranosides. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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