2,3-bis-O-(4-methoxyphenylmethyl)-4,6-O-(4-methoxyphenylmethylidene)-α-D-galactopyranosyl trichloroacetimidate 、
methyl {methyl 2,3-di-O-benzoyl-4-O-[2',3'-bis-O-(4-methoxyphenylmethyl)-6'-methyl-α-D-galactopyranuronosyl]-α-D-galactopyranosid}uronate 在
4 A molecular sieve 、
三乙基硅基三氟甲磺酸酯 作用下,
以
乙醚 为溶剂,
反应 0.17h,
以99%的产率得到methyl {methyl 2,3-di-O-benzoyl-4-O-{2',3'-bis-O-(4-methoxyphenylmethyl)-4'-O-[2'',3''-bis-O-(4-methoxyphenylmethyl)-4'',6''-O-(methoxyphenylmethylidene)-α-D-galactopyranosyl]-6'-methyl-α-D-galactopyranuronosyl}-α-D-galactopyranosid}uronate