Influence of intramolecular hydrogen bonds on regioselectivity of glycosylation. Synthesis of lupane-type saponins bearing the OSW-1 saponin disaccharide unit and its isomers

- Lupane-type saponins bearing OSW-1 disaccharide and its stereoisomers were prepared.
- Influence of hydrogen bond network on regioselectivity of glycosylation was studied.
- Inversion of the arabinopyranoside rings was observed.
- Cytotoxic activity of lupane-type saponins was evaluated in vitro.