Stereospecific Synthesis of α- and β-C-Glycosides from Glycosyl Sulfoxides: Scope and Limitations
作者:Mercedes Carpintero、Inés Nieto、Alfonso Fernández-Mayoralas
DOI:10.1021/jo0014515
日期:2001.3.1
alpha-L-fuco-, alpha-D-gluco-, beta-D-gluco-, and alpha-D-mannopyranose have been synthesized from the corresponding glycosyl phenyl sulfoxide through phenylsulfinyl-lithium exchange, to generate an anomeric carbanion, and subsequent reaction with a carbon electrophile. The reactions were stereospecific and proceeded with retention of the configuration at the anomeric center. Improved yields of C-glycosides
衍生自α-L-岩藻糖,α-D-葡萄糖-,β-D-葡萄糖-和α-D-甘露聚糖的C-糖苷是通过相应的糖基苯基亚砜通过苯亚磺酰基-锂交换合成的,以生成异头碳负离子,随后与碳亲电试剂反应。该反应是立体特异性的,并且在构型保持在异头中心处进行。通过逆添加方案获得提高的C-糖苷产率。用醛截留异头碳负离子的效果最佳。还研究了与酮,氯甲酸酯,腈和卤代烷的反应。讨论了反应的机理。