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Carbanionic reactivity of the anomeric center in carbohydrates.

In less than the last two decades a fundamentally new role of carbohydrates in living organisms1 has emerged: conjugates of oligosaccharides with proteins or lipids proved to be the major information carriers between cells and their surroundings.2-4 The need for these specific substances in quantities larger than isolable from biological sources in order to thoroughly understand their biological functions has brought about the renaissance of synthetic carbohydrate chemistry.5-8 A quest for compounds which can mimic the above natural substances by way of similar structure and/or biological action (the so-called mimetics) has also arisen and stimulated elaboration