Silver trifluoromethanesulphonate-promoted condensation of 3,6-di-O-acetyl-4-O-(2,3,4,6-tetra-O-acetyl-β-D-galactopyranosyl)-2-deoxy-2-phthalimido-β-D-mannopyranoside and benzyl 2,4-di-O-benzyl-3,6-di-O-(3,4,6,-tri-O-benzyl-α-D-mannopyranosyl)-α-D-mannopyranoside gave a protected pentasaccharide and a protected heptasaccharide in 56% and 43% yield, respectively; after deblocking the free penta- and
三氟甲磺酸银促进的3,6-二-O-
乙酰基-4- O-(2,3,4,6-四-O-
乙酰基-β - D-
吡喃半
乳糖基)-2-
脱氧-2-邻
苯二甲
酰亚胺基-缩合反应β - d -mannopyranoside和
苄基2,4-二- ø -
苄基-3,6-二- ö - (3,4,6, -三- ö
苄基α - d -mannopyranosyl) - α - d -
甘露糖吡喃糖苷以56%和43%的产率得到被保护的五糖和被保护的七糖。解封后,得到游离的五糖和七糖。