Azidotrimethylsilylation of carbohydrates (monosaccharides and disaccharides) has been achieved in high yields under Mitsunobu conditions. The azidation of carbohydrates is effected at 0 °C essentially only at the primary alcoholic position in mono, di- and triols in protected/unprotected glycosides, whereas the remaining secondary hydroxyl groups got silylated. Surprisingly, no azidation of the secondary hydroxyls was observed in all the carbohydrate substrates. Applications of the methodology for the synthesis of amino sugars, triazoles and azasugars are reported.
在Mitsunobu条件下,实现了
碳水化合物(
单糖和
双糖)高产率的叠加三甲基
硅烷化。
碳水化合物的叠加在0 °C下仅在单醇、二醇和三醇的初级醇位点进行,保护/未保护的糖苷中,剩余的二级羟基则被
硅烷化。令人惊讶的是,在所有
碳水化合物底物中没有观测到二级羟基的叠加反应。该方法的应用已用于
氨基糖、三唑和氮糖的合成。