8-methoxycarbonyloctyl 2,3,4-tri-O-benzyl-6-O-(tert-butyldimethylsilyl)-α-D-mannopyranoside 、
2-O-(2,3,4,6-tetra-O-acetyl-α-D-mannopyranosyl)-3,4-di-O-benzyl-6-O-diphenylphosphoryl-α-D-mannopyranosyl chloride 在
4 A molecular sieve 、
silver trifluoromethanesulfonate 作用下,
以
1,2-二氯乙烷 为溶剂,
以37%的产率得到8-methoxycarbonyloctyl-2-O-<2-O-(2,3,4,6-tetra-O-acetyl-α-D-mannopyranosyl)-3,4-di-O-benzyl-6-O-diphenylphosphoryl-β-D-mannopyranosyl>-3,4-di-O-benzyl-6-O-tetrt-butyldimethylsilyl-α-D-mannopyranoside