Four-component reactions: The Ugi reaction of four suitably functionalized carbohydrate derivatives (as a per-O-benzylated amine, an aldehyde, a carboxylic acid, and an isocyanide) allow the effective assembly of diverse compound libraries. The complex glycoconjugates formed can be deprotected (see the picture for an example), and the resulting glycomimetics are of high interest for screening purposes.
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Oswald Lockhoff (1998) studied this question.