1'-tert-butyl 2,3-diethyl (1R,2R,3S)-3-acetyl-5'-bromo-2'-oxo-1',2'-dihydrospiro[cyclopropane-1,3'-indole]-1',2,3-tricarboxylate 在
三氟乙酸 作用下,
生成 2,3-diethyl (1R,2R,3S)-3-acetyl-5'-bromo-2'-oxo-1',2'-dihydrospiro[cyclopropane-1,3'-indole]-2,3-dicarboxylate