A facile stereoselective synthesis of protected N-glycosyl amides is reported. Peracetates or perpivaloates of monosaccharides with gluco-, galacto- and manno-configurations react with acetonitrile in a Ritter-like fashion under acidic condition. The stereoselectivity of this anomeric Ritter-type reaction strongly favors β-anomers of N-d-glycosyl amides regardless of the configurations of the sugars.
报告了一种简便的立体选择性合成保护的N-糖苷酰胺的方法。具有
葡萄糖、半
乳糖和
甘露糖构型的
单糖的
醋酸酯或五
氟醋酸酯在酸性条件下与
乙腈以类似Ritter反应的方式反应。这种同位素Ritter类型反应的立体选择性强烈偏向于N-d-糖苷酰胺的β-同构体,而不受糖的构型影响。