N-benzyl-N-benzyloxycarbonyl-5-aminopentyl O-(2-O-acetyl-3,4,6-tri-O-benzyl-β-D-galactopyranosyl)-(1→4)-O-(2-azido-6-O-benzyl-2-deoxy-α-D-glucopyranosyl)-(1→4)-O-(2-azido-3,6-di-O-benzyl-2-deoxy-β-D-mannopyranosyl)-(1→4)-6-O-benzyl-2-deoxy-3-O-levulinoyl-2-(2,2,2-trichloroethoxy)carbonylamino-β-D-glucopyranoside 、 在
三氟甲磺酸三甲基硅酯 作用下,
以
乙醚 、
二氯甲烷 为溶剂,
反应 2.0h,
以72%的产率得到N-Benzyl-N-benzyloxycarbonyl-5-aminopentyl O-(2-O-acetyl-3,4,6-tri-O-benzyl-β-D-galactopyranosyl)-(1→4)-[O-(2,3,4,6-tetra-O-benzyl-α-D-galactopyranosyl)-(1→3)]-O-(2-azido-6-O-benzyl-2-deoxy-α-D-glucopyranosyl)-(1→4)-O-(2-azido-3,6-di-O-benzyl-2-deoxy-β-D-mannopyranosyl)-(1→4)-6-O-benzyl-2-deoxy-3-O-levulinoyl-2-(2,2,2-trichloroethoxy)carbonylamino-β-D-glucopyranoside