The synthesis of the disaccharides α-L-Fucp-(1,2)- and α-L-Fucp-(1,3)-β-D-Galp(1)-4-methylumbelliferone as fucosidase substrates was accomplished by activation of the anomeric centre of 2,3,4-tri-O-acetyl- and 2,3,4,6-tetra-O-acetyl-α,β-L-fuco- and -D-galactopyranosyl propane-1,3-diyl phosphates with TMSOTf and with minimal protection of 4-methylumbelliferyl β-D-galactopyranoside.
合成
双糖α-
L-岩藻糖-(1,2)-和α-
L-岩藻糖-(1,3)-β-
D-半乳糖-(1)-4-甲基伞花素作为岩藻糖苷酶底物,通过用TMSOTf激活2,3,4-三-O-乙酰基和2,3,4,6-四-O-乙酰基α,β-
L-岩藻糖和-
D-半乳糖基
丙烷-1,3
-二醇磷酸盐的异头中心,并对4-甲基伞花素β-
D-半乳糖苷进行了最小保护。