The invention relates to new 3-pyridyl-5-alkoxy-pyrazole derivatives of the following formula: ##STR1## wherein R.sub.1 represents a 4-pyridyl, 3-pyridyl or 2-pyridyl group which is unsubstituted or which may be substituted with one or two lower alkyl groups; R.sub.2 represents a hydrogen atom or a lower alkyl group; and R.sub.3 represents a lower alkyl group, a phenyl group or an aralkyl group; and the acid addition salts thereof. The derivatives may be prepared by alkylation of a 3-pyridyl-5-pyrazolone. The derivatives are medicinally useful, particularly for the treatment of cardiac deficiency.
本发明涉及下列公式的新的3-
吡啶基-5-烷氧基-
吡唑烷衍
生物:##STR1##
其中,R.sub.1代表未取代或可取代为一个或两个较低烷基的4-
吡啶基、3-
吡啶基或2-
吡啶基基团;R.sub.2代表氢原子或较低烷基基团;R.sub.3代表较低烷基基团、苯基或芳基烷基基团;以及它们的酸加成盐。这些衍
生物可以通过3-
吡啶基-5-
吡唑酮的烷基化制备而成。这些衍
生物在医学上有用,特别是用于治疗心脏衰竭。