methyl 2,3,6-tri-O-benzyl-4-O-(2,6-anhydro-5-C-benzyloxycarbonyl-3-O-methyl-β-D-mannopyranosyl)-α-D-glucopyranoside 、 在
叔丁基二甲硅基三氟甲磺酸酯 作用下,
以
乙醚 、
二氯甲烷 为溶剂,
反应 0.5h,
以67%的产率得到methyl O-(6-O-acetyl-2,3,4-tri-O-methyl-α-D-gluco-pyranosyl)-(1→4)-O-(benzyl 2,3-di-O-methyl-α-D-gluco-pyranosyluronate)-(1→4)-O-(3,6-di-O-acetyl-2-O-benzyl-α-D-glucopyranosyl)-(1→4)-(2,6-anhydro-5-C-benzyloxy-carbonyl-3-O-methyl-β-D-mannopyranosyl)-(1→4)-2,3,6-tri-O-benzyl-α-D-glucopyranoside