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Synthesis of 2-(trimethylsilyl)ethyl α-D-mannopyranosides revisited
被引:9
作者:
Saksena, R
[1
]
Zhang, J
[1
]
Kovác, P
[1
]
机构:
[1] NIDDK, LMC, NIH, Bethesda, MD 20892 USA
关键词:
2-(trimethylsilyl)ethyl glycosides;
glycosylation;
NIS/AgOTf;
anomerization;
D O I:
10.1081/CAR-120016846
中图分类号:
Q5 [生物化学];
Q7 [分子生物学];
学科分类号:
071010 ;
081704 ;
摘要:
Glycosylation of 2-(trimethylsilyl)ethanol with various ethyl 1-thioglycosides, which were activated with N-iodosuccinimide and silver triflate, was studied. The starting thioglycosides, some prepared for the first time, were obtained conventionally from the corresponding alpha-1-acetates. When beta-1-acetates were more readily available, these were converted to the alpha-anomers by anomerization, prior to the glycosylation. Using ethyl 1-thioglycosides as glycosyl donors, especially those bearing a pivaloyl or a nonparticipating group at O-2, the corresponding 2-(trimethylsilyl)ethyl alpha-D-mannopyranosides were obtained in excellent yields.
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页码:453 / 470
页数:18
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