2-[4-(二乙基氨基)-2-甲基苯甲酰]苯甲酸 、
N,N,N',N'-四甲基苯-1,3-二胺 在
乙酸酐 、
甲苯 作用下,
以afforded 3-(2,4-bis(dimethylamino)phenyl)-3-(2-methyl-4-(diethylamino)phenyl)phthalide (I: X = (CH3)2N, Y2 = CH3, Y4 = (CH3CH2)2N, Z4 = Z5 = Z6 = Z7 = H) in a first crop from toluene (m.p. 204°-206° C.)的产率得到3-[2,4-二(二甲基氨基)苯基]-3-[4-(二乙基氨基)-2-甲基苯基]-1(3H)-异苯并呋喃酮