abstract |
A process for advantageously producing compounds of general formula (III), wherein R 1 represents hydrogen, alkyl having 1 to 6ncarbon atoms, alkoxyl having 1 to 4 carbon atoms, halogen, hydroxyl, trifluoromethyl, nitro or amino, R 2 represents substituted ornunsubstituted phenyl or pyridyl, R 3 and R 4 each represents hydrogen, alkyl having 1 to 6 carbon atoms, hydroxyalkyl having 1 to 4 carbonnatoms, cycloalkyl having 3 to 8 carbon atoms, or substituted or unsubstituted phenyl; and Y represents alkylene having 1 to 12 carbon atoms,nand salts thereof. |