、 1,3,4,6-tetra-O-acetyl-2-O-(2,3,4,6-tetra-O-acetyl-α-D-mannopyranosyl)-α-D-mannopyranose 在
4 A molecular sieve 、
silver trifluoromethanesulfonate 作用下,
以
1,2-二氯乙烷 为溶剂,
以73%的产率得到benzyl O-(2,3,4,6-tetra-O-acetyl-α-D-mannopyranosyl)-(1-2)-O-(3,4,6-tri-O-acetyl-α-D-mannopyranosyl)-<(1-2)-O-3,4,6-tri-O-banzyl-α-D-mannopyranosyl>
3-(1-2)-3,4,6-tri-O-benzyl-α-D-mannopyranoside