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