Herein we report, for the first time, the successful anomeric azidation of per-O-acetylated and per-O-benzoylated sugars by catalytic amounts of oxophilic AuBr3 in good to excellent yields. The method is applicable to a wide range of easily accessible per-O-acetylated and per-O-benzoylated sugars. While reaction with per-O-acetylated and per-O-benzoylated monosaccharides was complete within 1–3 h at room temperature, the per-O-benzoylated disaccharides needed 2–3 h of heating at 55 °C.
在这里,我们首次报道了对经过
O-乙酰化和
O-苯甲酰化的糖进行顺式异构体化合成的成功实例,通过使用催化量的亲
氧化金Br
3,产率良好至优良。该方法适用于广泛易得的
O-乙酰化和
O-苯甲酰化糖。虽然与
O-乙酰化和
O-苯甲酰化的
单糖在室温下1-3小时内反应完成,但
O-苯甲酰化的二糖需要在55°C下加热2-3小时。