ethyl 2-(3-(2-(chlorosulfonyl)-4-methylphenylthio)-2,6,6-trimethyl-4-oxo-4,5,6,7-tetrahydro-1H-indol-1-yl)acetate   、                                                                                      
四氢吡咯                                                                                                                                                              在
                                                                                                                                                                                 
三氟乙酸   、                                                                                                  
ethyl 2-(2,6,6-trimethyl-3-(4-methyl-2-(pyrrolidin-1-ylsulfonyl)phenylthio)-4-oxo-4,5,6,7-tetrahydro-1H-indol-1-yl)acetate                                                                                                                                  作用下,
                                                                                                                以
                                                                                         
二氯甲烷                                                                                  为溶剂,
                                                                                                                                                    反应 12.0h,
                                                                                                                以afforded desired product, ethyl 2-(2,6,6-trimethyl-3-(4-methyl-2-(pyrrolidin-1-ylsulfonyl)phenylthio)-4-oxo-4,5,6,7-tetrahydro-1H-indol-1-yl)acetate (0.082 g, 0.158 mmol, 22.75% yield) as a brown solid的产率得到ethyl 2-(2,6,6-trimethyl-3-(4-methyl-2-(pyrrolidin-1-ylsulfonyl)phenylthio)-4-oxo-4,5,6,7-tetrahydro-1H-indol-1-yl)acetate