Carbohydrates, as cheap mass-products, promise to be outstanding candidates as sustainable raw materials. To achieve the goal of carbohydrate utilisation as industry raw materials, environmental low impact conversions from sugars to high value products are needed. Here we present the conversion of reducing sugars into imidazole heterocycles. Imidazole formation was achieved by a one-pot conversion of reducing mono and disaccharides with amidines in a melt of ammonium carbonate. A range of disaccharides were converted into different 2-substituted imidazoles carrying a varying glycosylation pattern on the 4-tetrahydroxy butyl side chain. All conversions were performed without the need of protecting groups, using benign reagents and solvents.
碳水化合物作为廉价的大众产品,有望成为可持续原材料的最佳候选者。为了实现将
碳水化合物用作工业原料的目标,需要将糖转化为高价值产品,这种转化过程对环境的影响较小。在此,我们介绍将还原糖转化为
咪唑杂环的方法。通过在
碳酸铵熔体中将还原性
单糖和二糖与脒进行一步转化,实现了
咪唑的形成。一系列二糖被转化为不同的 2-取代
咪唑,其 4-四羟基丁基侧链上带有不同的糖基化模式。所有转化过程都无需保护基团,使用的是良性试剂和溶剂。