2,3,4-O-tri-(4-methoxyphenylmethyl)-6-O-triphenylmethyl-β-D-galactopyranosyl-(1->4)-1-O-(tert-butyldimethylsilyl)-2,3-di-O-(4-methoxyphenylmethyl)-6-O-triphenylmethyl-D-galactitol                                                                                                                                                              在
                                                                                                                                                                                 
乙酸酐   、                                                                                                  
二甲基亚砜                                                                                                                                  作用下,
                                                                                                                                                                                        反应 10.0h,
                                                                                                                以99%的产率得到(3S,4S,5S)-6-(tert-butyldimethylsilyloxy)-4,5-di-(4-methoxyphenylmethoxy)-1-triphenylmethoxy-2-hexanon-3-yl 2,3,5-O-tri-(4-methoxyphenylmethyl)-6-O-triphenyl methyl-α-D-galactopyranoside