3'-hydroxy-4,4'-dimethoxy-3'-methyl-3-oxo-7,7'-bis(piperidin-1-ylcarbonyloxy)-2,2'-spirobi[2H,2'H,3H,3'H-benzo[b]thiophene]                                                                                                                                                              在
                                                                                                                                                                                 
甲烷磺酸                                                                                                                                  作用下,
                                                                                                                以
                                                                                         
二氯甲烷                                                                                  为溶剂,
                                                                                                                                                    反应 2.0h,
                                                                                                                以86%的产率得到6-methoxy-2-(4'-methoxy-3'-methyl-7'-(piperidin-1-ylcarbonyloxy)benzo[b]thiophen-2-ylthio)-3-(piperidin-1-ylcarbonyloxy)benzoic acid