Readily available O-thiobenzoyl-manno-pyranosyl)trichloroacetimidate 4
a gave with glucosides 7 and 8 as glycosyl accepters exclusively alpha
-linked disaccharides 9 alpha and 10 alpha. Accordingly, from O-(2-O-t
hiobenzoyl-glucopyranosyl)trichloroacet imidate 4b exclusively beta-li
nked disaccharides 9 beta and 10 beta were obtained. Radical initiated
deoxygenation with Bu3SnH/AIBN directly furnished 2-deoxyglycosides 1
1 alpha,beta and 12 alpha,beta.