申请人:Sumitomo Chemical Company, Limited
公开号:US03933847A1
公开(公告)日:1976-01-20
A coumarin dye of the formula (Ia), ##SPC1## Wherein R.sub.1 is hydrogen, chlorine or C.sub.1 -C.sub.2 alkyl, R.sub.2 and R.sub.3 are hydrogen or C.sub.1 -C.sub.4 alkyl, or a quarternary salt thereof having the formula (Ib), ##SPC2## Wherein R.sub.1, R.sub.2 and R.sub.3 are as defined above, R.sub.4 is C.sub.1 -C.sub.2 alkyl or benzyl, and X.sup.- is an anion, is prepared by an improved method, which comprises reacting a diamine of the formula, ##SPC3## Wherein R.sub.1 is as defined above, with a compound of the formula, X -- CH.sub.2 -- Y wherein X and Y are the same or different and are carboxyl, carbamoyl, alkoxycarbonyl or cyano, in 10 to 70 % sulfuric acid to prepare an imidazolyl acetic acid of the formula, ##SPC4## Wherein R.sub.1 is as defined above, and then reacting the imidazolyl acetic acid with a compound of the formula, ##SPC5## Wherein R.sub.2 and R.sub.3 are as defined above, to obtain the dye (Ia), or further reacting the resulting dye (Ia) with an alkylating agent to obtain the dye (Ib).
化合物(Ia)的香豆素染料的化学式为:##SPC1## 其中,R1为氢、氯或C1-C2烷基,R2和R3为氢或C1-C4烷基,或者其季铵盐的化学式为(Ib):##SPC2## 其中,R1、R2和R3的定义如上所述,R4为C1-C2烷基或苯甲基,X-为阴离子。该染料的改进制备方法包括将化学式为:##SPC3## 的二胺与化学式为X-CH2-Y的化合物反应,其中X和Y相同或不同,分别为羧酸、氨甲酰、烷氧羰基或氰基,在10至70%的硫酸中制备出化学式为:##SPC4## 的咪唑乙酸,其中R1的定义如上所述,然后将咪唑乙酸与化学式为:##SPC5## 的化合物反应,其中R2和R3的定义如上所述,以得到染料(Ia),或进一步将所得染料(Ia)与烷基化试剂反应以得到染料(Ib)。