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2004
Carbohydrates
U 0500
Highly α-Selective Glycosylation with Glycosyl Acetate via Glycosyl PhosphoniIodide. — Highly α-selective glycosylations of several acceptors, such as (II) and
49- 181 um
(V), is achieved with glycosyl phosphonium iodides as glycosyl donors. These intermediates are readily generated in situ from glycosyl acetates (I) and (IV), Tms-I and
phosphine oxide. The reaction proceeds smoothly to afford the corresponding disaccharides, such as (III) and (VI) in high yields. — (KOBASHI, Y.; MUKAIYAMA*,
T.; Chem. Lett. 33 (2004) 7, 874-875; Cent. Basic Res., Kitasato Inst., Kita, Tokyo
114, Japan; Eng.) — M. Paetzel
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