allyl (2,3,4,6-tetra-O-benzyl-α-D-glucopyranosyl)-(1→3)-(4-O-benzyl-2-O-levulinoyl-α-L-rhamnopyranosyl)-(1→2)-(3,4-di-O-benzyl-α-L-rhamnopyranosyl)-(1→3)-(2-O-acetyl-4-O-benzyl-α-L-rhamnopyranosyl)-(1→3)-2-acetamido-2-deoxy-4,6-O-isopropylidene-β-D-glucopyranoside 在
sodium methylate 作用下,
以
甲醇 为溶剂,
反应 3.0h,
以94%的产率得到allyl (2,3,4,6-tetra-O-benzyl-α-D-glucopyranosyl)-(1→3)-(4-O-benzyl-α-L-rhamnopyranosyl)-(1→2)-(3,4-di-O-benzyl-α-L-rhamnopyranosyl)-(1→3)-(4-O-benzyl-α-L-rhamnopyranosyl)-(1→3)-2-acetamido-2-deoxy-4,6-O-isopropylidene-β-D-glucopyranoside