A general and efficient route to 3-O-modified carbohydrate bis(oxazoline) ligands

摘要

An efficient route to derivatives of carbohydrate-based bis(oxazoline) ligands with 3-O substituents of varying steric demand is described. The synthesis of the new ligands proceeds via a thioglucoside key intermediate, the double cyclisation reaction to the desired bis(oxazolines) is initiated with N-iodo succinimide under mild conditions. Employing this strategy, four new 3-O-modified bis(oxazoline) ligands were obtained in good yields.