9-[(2R,3S,4S,5R,6R)-3,4,5-Tris-benzyloxy-6-(tert-butyl-diphenyl-silanyloxymethyl)-tetrahydro-pyran-2-yloxy]-nonanoic acid methyl ester 、 ethyl 2-O-acetyl-3,4,6-tri-O-benzyl-α-D-mannopyranosyl-(1->2)-3,4,6-tri-O-benzyl-thio-α-D-mannopyranoside 在
N-碘代丁二酰亚胺 、
三氟甲磺酸 、 4 A molecular sieve 作用下,
以
乙醚 、
二氯甲烷 为溶剂,
以81%的产率得到8-Methoxycarbonyloctyl 2-O-acetyl-3,4,6-tri-O-benzyl-α-D-mannopyranosyl-(1->2)-3,4,6-tri-O-benzyl-α-D-mannopyranosyl-(1->3)-2,4-di-O-benzyl-6-O-tert-butyldiphenylsilyl-β-D-mannopyranoside