2-[(2-methyl-5-methoxy-3-indolyl)carbonyl]-benzoic acid   、                                                                                      
N,N,N',N'-四甲基苯-1,3-二胺   、                                                                                      
乙酸酐   、                                                                                      cis-4-{[(3-benzyloxy-phenyl)-(3-chloro-pyrazin-2-yl)-methyl]-carbamoyl}-cyclohexanecarboxylic acid methyl ester                                                                                                                                                                                                                                                                                                          以to obtain 2.5 g of 3-[2,4-bis(dimethylamino)phenyl]-3-(2-methyl-5-methoxy-3-indolyl)phthalide (Formula III的产率得到3-(2,4-bis-dimethylamino-phenyl)-3-(5-methoxy-2-methyl-indol-3-yl)-3
H-isobenzofuran-1-one