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

[摘要]：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 cyclization to the desired bis(oxazolines) is initiated with N-iodosuccinimide under mild conditions. Employing this strategy, four new 3-O-modified bis(oxazoline) ligands were obtained in good yields.

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