Carbohydrate-lectin recognition of sequence-defined heteromultivalent glycooligomers.

Multivalency as a key principle in nature has been successfully adopted for the design and synthesis of artificial glycoligands by attaching multiple copies of monosaccharides to a synthetic scaffold. Besides their potential in various applied areas, e.g.

Expedient synthesis of chiral oxazolidinone scaffolds via rhodium-catalyzed asymmetric ring-opening with sodium cyanate.

A method for synthesizing chiral oxazolidinone scaffolds from readily available oxabicyclic alkenes is described. The reaction utilizes a domino sequence of Rh(I)-catalyzed asymmetric ring-opening (ARO) with sodium cyanate as a novel nucleophile followed by intramolecular cyclization to generate oxazolidinone products in excellent enantioselectivities (trans stereochemistry).