methyl 2-[(3,5-dichloropyridin-4-yl)amino]-7,7-dimethyl-7,8-dihydrofuro[2,3-g][1,3]benzothiazole-5-carboxylate   、                                                                                         、                                                                                      
sodium hydroxide                                                                                                                                                              在
                                                                                                                                                                                 
2-[(3,5-dichloropyridin-4-yl)amino]-7,7-dimethyl-7,8-dihydrofuro[2,3-g][1,3]benzothiazole-5-carboxylic acid                                                                                                                                  作用下,
                                                                                                                以
                                                                                         
甲醇                                                                                  为溶剂,
                                                                                                                                                                                        以to afford 0.050 g of the desired product的产率得到2-[(3,5-dichloropyridin-4-yl)amino]-7,7-dimethyl-7,8-dihydrofuro[2,3-g][1,3]benzothiazole-5-carboxylic acid