2-[(1-n-butyl-2-methyl-3-indolyl)carbonyl]-3,4,5,6-tetrachlorobenzoic acid 、
N,N,N',N'-四甲基苯-1,3-二胺 、
乙酸酐 、
sodium hydroxide 在
苯 、 Petroleum ether 作用下,
反应 16.67h,
以to obtain 3-[2,4-bis(dimethylamino)phenyl]-3-(1-n-butyl-2-methyl-3-indolyl)-4,5,6,7-tetrachlorophthalide (Formula III的产率得到3-(2,4-bis-dimethylamino-phenyl)-3-(1-butyl-2-methyl-indol-3-yl)-4,5,6,7-tetrachloro-3
H-isobenzofuran-1-one