作者:Djurdjica Ljevaković、Dina Keglević
DOI:10.1016/s0008-6215(00)84580-2
日期:1980.11
The synthesis of the fully benzylated α- and β-d-glucopyranosyluronic esters of 1-benzyl N-benzyloxycarbonyl-l-aspartic and -glutamic acids and N-(tert-butoxycarbonyl)-l-phenylalanine, followed by hydrogenolysis, afforded the respective anomers of the 1-O-acyl-d-glucopyranuronic acids 2, 7, and 12. Esterification of both anomers of the N-acetylated derivatives of 2 and 7 by diazomethane was accompanied
1-苄基N-苄氧基羰基-1-天冬氨酸和-谷氨酸的完全苄基化的α-和β-d-吡喃葡萄糖基糖醛糖醛酸酯和N-(叔丁氧基羰基)-1-苯丙氨酸的合成,随后进行氢解。 1-O-酰基-d-吡喃葡萄糖醛酸2、7和12的异构体。重氮甲烷对2和7的N-乙酰化衍生物的两个异构体的酯化反应伴随着糖基键的裂解,在α-异头物,伴随着1→2的酰基迁移,在O-乙酰化后分别得到2-O-酰基O-乙酰基甲基酯衍生物5和10。类似地,12α产生1,3,4-三-O-乙酰基-2-O- [N-(叔丁氧基羰基)-1-苯基丙氨酰基] -d-吡喃葡萄糖醛酸甲酯和具有呋喃呋喃诺-6,3-内酯的类似物结构体。C-5羧基的酯化 在BF3--MeOH试剂(1-1.5当量)存在下,甲醇在1-O-酰基-α-d-吡喃葡萄糖醛酸中进行的操作没有酰基迁移。通过使用该程序,然后进行乙酰化,7α的N-乙酰化衍生物提供了甲基2,3,4-三-O-乙酰-1-O-(1