methyl [β-D-glucopyranosyl-(1->4)-β-(1-thio-Δ(5,5a)carbaglucopyranosyl)-(1->4)-β-(β-D-glucopyranoside)]   、                                                                                      
乙酸酐                                                                                                                                                              在
                                                                                                                                                                                 
吡啶   、                                                                                                  
4-二甲氨基吡啶                                                                                                                                  作用下,
                                                                                                                                                                                        反应 2.0h,
                                                                                                                以87%的产率得到methyl [2,3,4,6-tetra-O-acetyl-β-D-glucopyranosyl-(1->4)-β-(2,3,6-O-triacetyl-1-thio-Δ(5,5a)carbaglucopyranosyl)-(1->4)-β-(2,3,6-tri-O-acetyl-β-D-glucopyranoside)]