4-O-acetyl-3-O-(4-O-acetyl-2,6-dideoxy-2-bromo-β-D-galactopyranosyl)-(1->3)-α-D-glucopyranosyl fluoride 、
α,β-acetyl 4-O-acetyl-3-O-(3,4-di-O-acetyl-2,6-dideoxy-2-iodo-β-D-glucopyranosyl)-(1->3)-D-glucopyranosyl trichloroacetimidate 在
叔丁基二甲硅基三氟甲磺酸酯 作用下,
以
二氯甲烷 为溶剂,
反应 1.25h,
以86%的产率得到4-O-acetyl-3-O-(4-O-acetyl-3-O-(3,4-di-O-acetyl-6-deoxy-2-deoxy-2-iodo-β-D-glucopyranosyl-(1->3)-4-O-acetyl-6-deoxy-2-deoxy-2-iodo-β-D-glucopyranosyl-(1->3))-2,6-dideoxy-2-bromo-β-D-galactopyranosyl)-(1->3)-α-D-glucopyranosyl fluoride