Dihydropyridine-derivatives and their production

Abstract From the Canadian patent

Abstract of the disclosure, Compounds of formula I I, wherein R1 is hydrogen, alkyl of 1 to 6 carbon atoms alkenyl or alkinyl of 3 to 6 carbon atoms cycloalkyl of 3 to 7 carbon atoms,cycloalkylalkyl of 4 to 8 carbon atoms, phenylalkyl of 7 to 9 carbon atoms or phenylalkenyl of 9 to 12 carbon atoms, the phenyl ring being unsubstituted or mono-, di- or trisubstituted independently by halogen, hydroxy or alkyl or alkoxy of 1 to 4 carbon atoms, R2 and R5 independently, are hydrogen or alkyl, of 1 to 6 carbon atoms R3 and R4, independently, are alkyl of 1 to 6 carbon atoms, alkenyl or alkinyl of 3 to 6 carbon - 2 -, atoms, cycloalkyl of 3 to 7 carbon atoms cycloalkylalkyl of 4 to 8 carbon atoms …