5-氟-1-甲基-1H-吲哚-2,3-二酮                                                                                                                                                              在
                                                                                                                                                                                 C
31H
26F
6N
4O
2   、                                                                                                  magnesium sulfate                                                                                                                                  作用下,
                                                                                                                以
                                                                                         
四氢呋喃   、                                                                                         
二氯甲烷                                                                                  为溶剂,
                                                                                                                                                    反应 4.5h,
                                                                                                                生成                                                 ethyl 5-fluoro-4'-hydroxy-1-methyl-2-oxo-4',5'-dihydro-2'H-spiro[indoline-3,3'-thiophene]-2'-carboxylate   、                                                                                             (2'R,3S,4'S)-ethyl 5-fluoro-4'-hydroxy-1-methyl-2-oxo-4',5'-dihydro-2'H-spiro[indoline-3,3'-thiophene]-2'-carboxylate   、                                                                                             
(2'S,3R,4'R)-ethyl 5-fluoro-4'-hydroxy-1-methyl-2-oxo-4',5'-dihydro-2'H-spiro[indoline-3,3'-thiophene]-2'-carboxylate