申请人:Wella Aktiengesellschaft
公开号:US04950302A1
公开(公告)日:1990-08-21
A process for producing 2,5-diamino-6-nitropyridine derivatives having the general formula (I) ##STR1## wherein R.sup.1 to R.sup.4 represent hydrogen or the radicals alkyl, hydroxy alkyl, dihydroxy alkyl, alkoxy alkyl, alkoxy carbonyl, hydroxy- or chlorine-substituted alkoxy carbonyl, aminoalkyl and aminoalkyl substituted by alkyl or hydroxy alkyl groups, the alkyl groups in each case containing 1 to 4 carbon atoms or an oxazolidinone ring being formed by R.sup.1 and R.sup.2 and/or R.sup.3 and R.sup.4. The present invention also relates to novel 2,5-diamino-6-nitropyridine derivatives and to a hair dyeing agent containing 2,5-diamino-6-nitropyridine derivatives, which are direct nitro dyes coloring the hair yellow orange to blue violet and are physiologically harmless.
一种制备2,5-二氨基-6-硝基吡啶衍生物的方法,其通式为(I)##STR1##其中R.sup.1至R.sup.4代表氢或基团烷基,羟基烷基,双羟基烷基,烷氧基烷基,烷氧羰基,羟基或氯代烷氧羰基,氨基烷基和被烷基或羟基烷基基团取代的氨基烷基,每种情况下的烷基含有1至4个碳原子,或由R.sup.1和R.sup.2和/或R.sup.3和R.sup.4形成的噁唑烷酮环。本发明还涉及新型2,5-二氨基-6-硝基吡啶衍生物和含有2,5-二氨基-6-硝基吡啶衍生物的染发剂,它们是直接硝基染料,能将头发染成黄橙色到蓝紫色,并且在生理上是无害的。