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Scheme 25
Fig. 4
3.5 Gold(I)-catalyzed glycosylations with glycosyl
trichloroacetimidates
Kunz et al. studied glycosyl trichloroacetimidates in Au(I)-catalyzed
glycosylation reactions. 2,3,4,6-tetra-O-acetyl-a-
D
-galactopyranosyl tri-
chloroacetimidate 137 reacts with alcohol aglycones in the presence of
Au(I) catalyst to give b-galactosides 138-142 stereoselectively in moderate
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