acetyl 2,4-O-diacetyl-3-O-(2,3,4,6-O-tetraacetyl-α-D-mannopyranosyl)-6-O-(2,3,4,6-O-tetraacetyl-α-D-mannopyranosyl)-β-D-mannopyranoside 、
acetyl 2,4-O-diacetyl-3-O-(2,3,4,6-O-tetraacetyl-α-D-mannopyranosyl)-6-O-(2,3,4,6-O-tetraacetyl-α-D-mannopyranosyl)-α-D-mannopyranoside 在
氢溴酸 作用下,
以
二氯甲烷 、
溶剂黄146 为溶剂,
反应 2.0h,
以90%的产率得到2,4-di-O-acetyl-3,6-bis-O-(2,3,4,6-tetra-O-acetyl-α-D-mannopyranoside)-α-D-mannopyranosyl bromide