lithiation of the readily available 2-phenylsulfinyl-D-glucal 2 provides the 1-C-lithiated species 2A furnishing with 4-deoxy-4-formyl-D-glucose derivative 7 in a diastereocontrolled reaction the C-disaccharide intermediate 8. This compound is transformed into the carbon bridged cellobiose derivative 1b [Glc-β(1→4C)Glc derivative]. Analogously, the corresponding Glc-β(1→4C)Gal derivative was obtained
容易获得的2-苯基亚磺酰基-
D-葡萄糖2的直接
锂化提供了1-C-
锂化的物质2A,其在非对映控制的反应中提供了4-脱氧-4-甲酰基-
D-葡萄糖衍
生物7 C-二糖中间体8。将该化合物转化为碳桥
纤维二糖衍
生物1b [Glc-β(1→4C)Glc衍
生物]。类似地,获得了相应的Glc-β(1→4C)Gal衍
生物。