Synthesis of the isomeric trisaccharides, methyl O-α-l-fucopyranosyl-(1→3, 4, and 6)-O-(2-acetamido-2-deoxy-β-d-glucopyranosyl)-(1→3)-β-d-galactopyranoside
作者:Rakesh K. Jain、Katsonuri Kohata、Saeed A. Abbas、Khushi L. Matta
DOI:10.1016/s0008-6215(00)90841-3
日期:1988.1
of the benzylidene group of 3 gave methyl 3- O -(2-acetamido-3,6-di- O -benzyl-2-deoxy-β- d -glucopyranosyl)-2,4,6-tri- O -benzyl-β- d -galactopyranoside ( 4 ). Cleavage of the 4,6-acetal group of 3 with hot, 80% aqueous acetic acid afforded the diol ( 5 ). Compounds 3, 4, and 5 were each subjected to halide ion-catalyzed glycosylation with 2,3,4-tri- O -benzyl-α- l -fucopyranosyl bromide to produce
摘要将3-O-(2-乙酰氨基-4,6-O-亚苄基-2-脱氧-β-d-吡喃葡萄糖基)-2,4,6-三-O-苄基-β-d-吡喃半乳糖苷甲基化在氢化钠存在下,在N,N-二甲基甲酰胺中的苄基溴化物提供甲基3- O-(2-乙酰氨基-3- O-苄基-4,6- O-亚苄基-2-脱氧-β-d-吡喃葡萄糖基)- 2,4,6-三-O-苄基-β-d-吡喃半乳糖苷(3)。3的亚苄基的还原性开环得到甲基3-O-(2-乙酰氨基-3,6-二-O-苄基-2-脱氧-β-d-吡喃葡萄糖基)-2,4,6-三- O-苄基-β-d-吡喃半乳糖苷(4)。用热的80%乙酸水溶液裂解3,4,6-缩醛基,得到二醇(5)。分别将化合物3、4和5进行卤离子催化的2,3,4-三-O-苄基-α-1-呋喃果糖基溴的糖基化反应,生成相应的三糖衍生物,