申请人:IMPERIAL CHEMICAL INDUSTRIES PLC
公开号:EP0192328A1
公开(公告)日:1986-08-27
A chromogenic pyrazine compound of formula:
wherein X1 and X2, which may be the same or different, are each selected from hydrogen, alkyl, optionally substituted alkyl, alkoxy, carboxyalkyl, optionally substituted aryl, optionally substituted heteroaromatic, optionally substituted aralkyl or dialkylamino, provided that both X1 and X2 are not both hydrogen at the same time; and A1 and A2, which may be the same or different, are each:
(i) a heterocyclic ring system having an aryl group annellated through a conjugated nitrogen linkage; or
(ii) a homocyclic aryl group having a substituent -NR1R2 wherein R, and R2 are separately hydrogen or an optionally substituted alkyl, aryl or aralkyl group or both R1 and R2 together with the nitrogen atom to which they are joined form a nitrogen-linked ring, provided that R1 and R2 are not both hydrogen at the same time.
式中的致色吡嗪化合物:
其中X1和X2可以相同或不同,各自选自氢、烷基、任选取代的烷基、烷氧基、羧基烷基、任选取代的芳基、任选取代的杂芳基、任选取代的芳烷基或二烷基氨基,条件是X1和X2不能同时都是氢;A1和A2可以相同或不同,各自为
(i) 具有通过共轭氮连接环化的芳基的杂环系统;或
(ii) 具有取代基 -NR1R2 的均环芳基,其中 R1 和 R2 分别为氢或任选取代的烷基、芳基或芳烷基,或 R1 和 R2 与它们连接的氮原子一起形成氮连接环,但 R1 和 R2 不能同时为氢。