This invention provides thiadiazinone derivatives represented by the following formula (I)
wherein R¹ represents hydrogen atom or C₁-C₅ alkyl, R² represents 5- or 6-membered heterocyclic ring having 1-3 nitrogen atoms, a oxygen atom, one sulfur atom, 1-3 nitrogen atoms and one oxygen atom, or 1-3 nitrogen atoms and one sulfur atom and each ring of which may optionally be substituted by at least one substituent selected from the group consisting of C₁-C₅ alkyl, cyano, hydroxy, C₁-C₅ alkoxy, amino, C₁-C₅ alkylamino, C₂-C₆ dialkylamino, C₂-C₅ acylamino, carboxyl, C₂-C₅ alkoxycarbonyl and carbamoyl; or pharmaceutically acceptable salts thereof. The compounds according to the present invention have an excellent cardiotonic activity, and are usful as active ingredients of cardiotonic drug.
本发明提供了由下式(I)表示的噻二嗪酮衍
生物
其中 R¹ 代表氢原子或 C₁-C₅ 烷基,R² 代表具有 1-3 个氮原子、1 个氧原子、1 个
硫原子、1-3 个氮原子和 1 个氧原子的 5 或 6 元杂环、
氰基、羟基、C₁-C₅ 烷氧基、
氨基、C₁-C₅ 烷基
氨基、C₂-C₆ 二烷基
氨基、C₂-C₅
氨基酰基、羧基、C₂-C₅ 烷氧基羰基和
氨基甲酰基;或其药学上可接受的盐类。本发明的化合物具有极佳的强心活性,可用作强心药物的活性成分。