New 2-aminonitropyridine derivatives are disclosed of the formula: ##STR1## wherein the nitro group is in the 3- or 5-position and X represents hydrogen, an alkoxy group with 1 to 3 C atoms or an unsubstituted or alkyl- or hydroxyalkyl substituted amino group, the alkyl portion of which has 1 to 3 C atoms R.sub.1 and R.sub.2 may be the same or different and represent hydrogen, divalent alkyl- with 1 to 3 C atoms, divalent cyclopropyl- or divalent alkenyl with 1 to 3 C atoms, phenylene- or divalent pyrrol and Y and Z may be the same or different and represent hydrogen, hydroxyl- or amino group of the formula II: ##STR2## wherein R.sub.3 and R.sub.4 may be the same or different and represent hydrogen, an unsubstituted alkyl or alkyl with 1 to 3 C atoms, substituted at any position by hydroxy or amino with 1 to 3 C atoms, with the proviso that whenever X represents hydrogen, then R.sub.1 and R.sub.2 cannot both be hydrogen, and R.sub.1 is not hydrogen, R.sub.2 is not divalent alkyl-, pheneylene-, divalent cycloalkyl- or divalent heterocyclic group and R.sub.3 and R.sub.4 do not both signify hydrogen. The compounds are produced by conversion of halogen-, alkoxy- or sulfonic acid substituted nitropyridines with the corresponding amines. These compounds are pharmaceutical intermediates and nontoxic coupler components in oxidation hair dyes.
本发明涉及一种新的2-
氨基硝基
吡啶衍生物,其
化学式为:##STR1##其中,硝基基团位于3-或5-位,X代表氢、具有1至3个碳原子的烷氧基或未取代或烷基或羟基烷基取代的
氨基基团,其中烷基部分具有1至3个碳原子。R.sub.1和R.sub.2可以相同或不同,代表氢、具有1至3个碳原子的双价烷基、具有1至3个碳原子的双价环丙基或双烯基、苯基或双价
吡咯基;Y和Z可以相同或不同,代表式II的氢、羟基或
氨基基团:##STR2##其中,R.sub.3和R.sub.4可以相同或不同,代表氢、未取代的烷基或具有1至3个碳原子的烷基,在任何位置上被羟基或具有1至3个碳原子的
氨基取代,但是当X代表氢时,R.sub.1和R.sub.2不能同时为氢,且R.sub.1不是氢,R.sub.2不是双价烷基、苯基、双价环烷基或双价杂环基,R.sub.3和R.sub.4不能同时表示氢。这些化合物通过将卤代、烷氧基或
磺酸基取代的
硝基吡啶转化为相应的
胺类制备而成。这些化合物是制药中间体和氧化染发剂中无毒的
偶联剂组分。