Practical Synthesis of the Disaccharide Epitope,<scp>D</scp>-Galactopyranosyl-α-1,3-<scp>D</scp>- galactopyranose, by using 1,2;5,6-Di-<i>O</i>-cyclohexylidene-α-<scp>D</scp>-galactofuranose as the Glycosyl Acceptor
作者:Isao SAKAMOTO、Hiroshi OHRUI
DOI:10.1271/bbb.64.1974
日期:2000.1
D-Galactosyl-α-1,3-D-galactopyranose (1) was chemically prepared in a good yield by coupling phenyl 2,3,4,6-tetra-O-benzyl-1-thio-β-D-galactopyranoside (5) or 2,3,4,6-tetra-O-benzyl-α-D-galactopyranosyl bromide (8) with 1,2:5,6-di-O-cyclohexylidene-α-D-galactofuranose (3) with subsequent de-O-benzylation and de-O-cyclohexylidenation of the resulting protected α-1,3-disaccharide.
D-吡喃半乳糖基-α-1,3-D-吡喃半乳糖(1)通过苯基2,3,4,6-四-O-苄基-1-硫代-β-D-吡喃半乳糖苷(5)或2,3,4,6-四-O-苄基-α-D-吡喃半乳糖基溴化物(8)与1,2:5,6-二-O-环己烯基-α-D-呋喃半乳糖(3)的耦合反应制备,随后对所得保护的α-1,3-二糖进行去-O-苄基化和去-O-环己烯基化,产率良好。