Compounds of the formula ##STR1## wherein R.sub.1 is phenyl substituted with 1 to 3 lower alkoxy groups or 1 to 3 halogens; R.sub.2 is hydroxy, lower alkoxy, lower alkanoyloxy, lower cycloalkylcarbonyloxy; ##STR2## R.sub.3 and R.sub.4 are independently lower alkyl, phenyl lower alkyl or together form a piperidine or pyrrolidine ring; n is 2 to 4; m is 1 to 2; or pharmaceutically acceptable acid addition salts thereof are described. The compounds of formula I have activity as calcium channel blockers and accordingly, are useful as agents for lowering blood pressure, and as agents for treating ischemia.
式为##STR1##的化合物,其中R.sub.1是苯基,其上取代有1至3个较低的烷氧基或1至3个卤素;R.sub.2是羟基、较低的烷氧基、较低的烷酰氧基、较低的环烷基羰基氧基;##STR2## R.sub.3和R.sub.4独立地是较低的烷基、苯基较低的烷基,或者一起形成
哌啶或
吡咯烷环;n为2至4;m为1至2;或其药学上可接受的酸盐。式I的化合物具有作为
钙通道阻滞剂的活性,因此可用作降低血压的药物,并用作治疗缺血的药物。