N-3)-O-(2,4-di-O-acetyl-6-O-benzyl-β-D-galactopyranosyl)-(1->4)>-O-<(6-deoxy-2,3,4-tri-O-benzyl-α-L-galactopyranosyl)-(1->3)>... 、
在
silver tetrafluoroborate 、 4 A molecular sieve 作用下,
以
四氢呋喃 为溶剂,
以52%的产率得到O-<(benzyl 5-acetamido-4,7,8,9-tetra-O-acetyl-3,5-dideoxy-D-glycero-α-D-galacto-2-nonulopyranosylonate)-(2->3)-O-(2,4-di-O-acetyl-6-O-benzyl-β-D-galactopyranosyl)-(1->4)>-O-<(6-deoxy-2,3,4-tri-O-benzyl-α-L-galactopyranosyl)-(1->3)>...