乙酸酐 、
4-O-(3,4,6-Tri-O-acetyl-2-N-allyloxycarbonylamino-2-deoxy-β-D-glucopyranosyl)-1,6-anhydro-β-D-mannopyranose 、 1,3,4,6-tetra-O-acetyl-2-deoxy-2-(allyloxycarbonylamino)-β-D-glucopyranose 在
4-二甲氨基吡啶 、
三氟甲磺酸三甲基硅酯 作用下,
以37%的产率得到2,3,4-Tri-O-(3,4,6-tri-O-acetyl-2-N-allyloxycarbonylamino-2-deoxy-β-D-glucopyranosyl)-1,6-anhydro-β-D-mannopyranose