Substrate-directed asymmetric induction in the rhodium catalyzed hydroformylation of C-allyl-sugars: The influence of the glycoside-moiety on the selectivity of the reaction

α- and β-C-allylgalactopyranosides, α-C-allylazaglucopyranoside and α-C-allylfruttofuranoside were hydroformylated at low temperatures affording a mixture of linear and branched aldehydes in regioisomeric and diastereoisomeric ratios depending on the glicoside structure. The influence of the different structural features of the sugar moiety on the regio- and diastereoselectivity of the hydroformylation reaction was evaluated.