allyl 3,6-di-O-benzyl-α-D-mannopyranoside 、 methyl O-(2,3,4,6-tetra-O-acetyl-β-D-galactopyranosyl)-(1->4)-3,6-di-O-acetyl-2-deoxy-2-phthalimido-1-thio-β-D-glucopyranoside 在
三氟甲烷磺酸甲酯 作用下,
以
乙醚 、
1,2-二氯乙烷 为溶剂,
以36%的产率得到allyl O-(2,3,4,6-tetra-O-acetyl-β-D-galactopyranosyl)-(1->4)-O-(3,6-di-O-acetyl-2-deoxy-2-phthalimido-β-D-glucopyranosyl)-(1->2)-O-<(2,3,4,6-tetra-O-acetyl-β-D-galactopyranosyl)-(1->4)-O-(3,6-di-O-acetyl-2-deoxy-2-phthalimido-β-D-glucopyranosyl)-...