Heteroarylaminomethanediphosphonic acids of the formula ##STR1## in which R.sub.1 represents an optionally benzo- or cyclohexeno-fused 5-membered heteroaryl radical that contains, as hetero atom(s), either from 2 to 4 N-atoms or 1 or 2 N-atoms as well as 1 O-atom or S-atom and that is unsubstituted or is substituted by lower alkyl; by phenyl that is unsubstituted or is substituted by lower alkyl, lower alkoxy and/or by halogen; by lower alkoxy; by hydroxy; by di-lower alkylamino; by lower alkylthio and/or by halogen; and R.sub.2 represents hydrogen or lower alkyl, and their salts, have a regulatory action on the calcium metabolism and can be used as active ingredients in medicaments for the treatment of illnesses that can be attributed to disorders of the calcium metabolism. They are manufactured, for example, as follows: in a compound of the formula ##STR2## in which X.sub.1 represents a functionally modified phosphono group X and X.sub.2 represents phosphono or similarly represents a functionally modified phosphono group X, the group(s) X is(are) converted into free phosphono.
配方为##STR1##的杂芳基
氨甲
二膦酸,其中R.sub.1代表一个可选择地与苯环或
环己烯融合的5-成员杂芳基团,该杂芳基团包含2到4个N原子或1到2个N原子以及1个O原子或S原子,并且未取代或被较低烷基,未取代或被较低烷基、较低烷氧基和/或卤素,较低烷氧基,羟基,二较低烷基
氨基,较低烷
硫基和/或卤素取代;R.sub.2代表氢或较低烷基,以及它们的盐,在
钙代谢上具有调节作用,并可作为药物的活性成分用于治疗可归因于
钙代谢紊乱的疾病。例如,它们可以如下制备:在化合物##STR2##中,其中X.sub.1代表功能修饰的膦基团X,X.sub.2代表膦基或类似地代表功能修饰的膦基团X,膦基团X被转化为游离膦基。