Hydroxypyridine derivatives of the formula
wherein
R1 is a branched C3-8 alkyl group or a C3-8 cycloalkyl group, each of which may be substituted;
R2 is a halogen atom, a C1-4 alkyl group or a C1-4 alkoxy group;
X is an oxygen atom or NR3 in which R3 is a hydrogen atom or a C1-4 alkyl group;
R4, R5 and R6 are independently (1) a hydrogen atom, (2) a halogen atom, (3) a cyano group, (4) a nitro group, (5) a C1-4 acyl group, (6) a C1-4 alkoxy group which may be substituted with halogen, (7) a C1-4 alkyl group which may be substituted with halogen or (8) a mercapto group which may be substituted with a C1-4 alkyl group;
m is 0 to 3; and
n is 0 or 1;
provided that all of R4, R5 and R6 are not hydrogen atom, or a salt thereof, which have potassium channel opening activity and are useful as therapeutic agents of cardiovascular diseases such as angina pectoris, hypertension, etc.
式中的羟基
吡啶衍生物
其中
R1 是支链 C3-8 烷基或 C3-8 环烷基,每个基团均可被取代;
R2 是卤素原子、C1-4 烷基或 C1-4 烷氧基;
X 是氧原子或 NR3,其中 R3 是氢原子或 C1-4 烷基;
R4、R5 和 R6 独立地是 (1) 氢原子,(2) 卤素原子,(3)
氰基,(4) 硝基,(5) C1-4
丙烯酸基,(6) 可被卤素取代的 C1-4 烷氧基,(7) 可被卤素取代的 C1-4 烷基或 (8) 可被 C1-4 烷基取代的巯基;
m 为 0 至 3;以及
n 为 0 或 1;
条件是所有 R4、R5 和 R6 均不是氢原子,或其盐,它们具有
钾通道开放活性,可用作心绞痛、高血压等心血管疾病的治疗剂。