(2'R,3R,4'S)-6-chloro-4'-[5-chloro-2-(2-methanesulfonylamino-1,1-dimethyl-2-oxo-ethoxy)-phenyl]-2'-(5-fluoro-2-methyl-phenyl) spiro[3H-indole-3,3'-piperidine]-2,6'(1H)-dione   、                                                                                      
乙酸酐                                                                                                                                                              在
                                                                                                                                         
4-二甲氨基吡啶                                                                                                                                                                                                                               盐酸   、                                                                                                  
Sodium sulfate-III   、                                                                                                  crude product   、                                                                                                  
乙醚                                                                                                                                  作用下,
                                                                                                                以
                                                                                         
二氯甲烷                                                                                  为溶剂,
                                                                                                                                                    反应 1.0h,
                                                                                                                以to give the title compound (200 mg)的产率得到(2'R,3R,4'S)-1-acetyl-6-chloro-4'-[5-chloro-2-(2-methanesulfonylamino-1,1-dimethyl-2-oxo-ethoxy)-phenyl]-2'-(5-fluoro-2-methyl-phenyl) spiro[3H-indole-3,3'-piperidine]-2,6'(1H)-dione