1-Alkylamino-3-(5-carbocyclicalkylaminocarbonylthiazol-2-yloxy)-2-propanol; 5-(5-carbocyclicalkylaminocarbonylthiazol-2-yloxymethylene-N-alkyloxazolid ine and/or 2-substituted oxazolidine derivatives thereof, and methods of making such compounds. The compounds exhibit cardiovascular activity and are useful in the treatment of abnormal heart conditions in mammals. The compounds are also useful in the treatment of hypertension in mammals. The 5-(5-carbocyclicalkylaminocarbonylthiazol-2-yloxymethylene)-N-alkyloxazoli dines and derivatives are also intermediates for the 1-alkylamino-3-(5-carbocyclicalkylaminocarbonylthiazol-2-yloxy)-2-propanol s. The 1-alkylamino-3-(5-carbocyclicalkylaminocarbonylthiazol-2-yloxy)-2-propanol s can be prepared by base or acid hydrolysis of the corresponding 5-(5-carbocyclicalkylaminocarbonylthiazol-2-yloxymethylene)-N-alkyloxazoli dine or derivative; or by treatment of the corresponding 3-(5-carbocyclicalkylaminocarbonylthiazol-2-yloxy)-2,3-epoxypropane with the desired alkylamine. Similarly the 5-(5-carbocyclicalkylaminocarbonylthiazol-2-yloxymethylene)-N-alkyloxazoli dine or derivative can be prepared from the corresponding 1-alkylamino-3-(5-carbocyclicalkylaminocarbonylthiazol-2-yloxy)-2-propanol s via treatment with an aldehyde or ketone.