ABSTRACT Esterification of a wide range of partially protected carbohydrate derivatives was achieved using acetic anhydride and a catalytic amount of ceric ammonium nitrate (CAN). Compatibility with the commonly used protecting groups was demonstrated, with the esterified products being furnished in good yields. Apart from affording the O-acetylated products, their mononitrated counterparts were also
摘要 使用
乙酸酐和催化量的
硝酸铈铵 (CAN) 实现了多种部分保护的
碳水化合物衍
生物的
酯化。证明了与常用保护基团的相容性,
酯化产物以良好的产率提供。除了提供 O-乙酰化产物外,还产生了它们的单硝化对应物,这取决于起始材料的反应性。降低 CAN 的摩尔当量只能提供 O-乙酰化产物,而增加它有利于单硝化衍
生物。图形概要