Oligosaccharide Analogues of Polysaccharides, Part 22, Synthesis of Cyclodextrin Analogues Containing a Buta-1,3-diyne-1,4-diyl or a Butane-1,4-diyl Unit
heptaglycosides 24 and 26, respectively, and their anomers 25 and 27 (Scheme 3). These were transformed into the glycosyl acceptors 28, 30, and 31. Glycosidation of 28 and 30 by 13 and 15, respectively, led to the benzyl-protected octasaccharides 32 (αα5α) and 33 (βα5α), and to the chlorobenzylated analogues 34 (αα5α) and 35 (βα5α), while glycosidation of 31 led to the 4-chlorobenzyl-protected analogues 36 (αα5β)