甲基-2,3,4-三-O-苄基-1-硫代-β-L-岩藻糖苷 、
(2,4,6-tri-O-benzoyl-3-O-levulinoyl-β-D-galactopyranosyl)-(1->3)-2-O-acetyl-N-benzyloxycarbonyl-6-O-tert-butyldimethylsilyl-1,5-dideoxy-1,5-imino-D-glucitol 在
4 A molecular sieve 、
DMTST 作用下,
以
苯 为溶剂,
反应 1.5h,
以55%的产率得到(2,4,6-tri-O-benzoyl-3-O-levulinoyl-β-D-galactopyranosyl)-(1->3)-[(2,3,4-tri-O-benzyl-α-L-fucopyranosyl)-(1->4)]-2-O-acetyl-N-benzyloxycarbonyl-6-O-tert-butyldimethylsilyl-1,5-dideoxy-1,5-imino-D-glucitol