The allyl ether as a protecting group in carbohydrate chemistry. Part V. Preparation of benzyl ethers of carbohydrates for use in oligosaccharide synthesis
作者:Patricia A. Gent、Roy Gigg
DOI:10.1039/p19740001446
日期:——
The four tri-O-benzyl ethers of benzyl α-D-galactopyranoside were prepared from benzyl 6-O-allyl-α-D-galactopyranoside. The stability of 4,6-O-propylidene derivatives of benzyl-α-D-galactopyranoside in acidic hydroxylic solvents was noted in this work. The condensations of 2,3,4,6-tetra-O-benzyl-α-D-glucopyranosyl chloride with methanol, benzyl 2,3,4-tri-O-benzyl-α-D-galactopyranoside, and benzyl 3
由苄基6 - O-烯丙基-α- D-吡喃半乳糖苷制备苄基α- D-吡喃半乳糖苷的四种三-O-苄基醚。在这项工作中指出了苄基-α- D-吡喃半乳糖苷的4,6- O-亚丙基衍生物在酸性羟基溶剂中的稳定性。2,3,4,6-四-O-苄基-α- D-吡喃葡萄糖基氯与甲醇,2,3,4-三-O-苄基-α- D-吡喃半乳糖苷和苄基3,4的缩合,6-三-O-苄基-α- D含有三乙胺和氯化四乙铵的二氯甲烷中的β-半乳糖吡喃糖苷得到的糖苷主要含有α-键。的13 C NMR结晶α联二糖的光谱,苄基6- ø - (2,3,4,6-四- ö苄基α- d吡喃葡萄糖基)-2,3,4-三- ø -苄基α- d -galactopyranoside和苄基2- ø - (2,3,4,6-四- ö苄基α- d吡喃葡萄糖基)-3,4,6三- ö苄基α- d将β-吡喃半乳糖苷与相应的β-连接的异构体进行了比较。2,3,4,6-四-O