| abstract |
The invention provides an industrial method for producing a spiroaminopyrrolidone derivative, which is an intermediate for producing a quinolone antibacterial agent. n The invention provides a method for producing a compound represented by formula (2): n n(wherein n is an integer of 2 to 5; R 1 represents a (substituted) alkyl group or a (substituted) aryl group; and R 2 represents a (substituted) alkoxycarbonyl group, a (substituted) aralkyloxycarbonyl group, a (substituted) aliphatic acyl group, or a (substituted) aromatic acyl group), which includes treating a compound represented by formula (1):n n n(wherein n, R 1 , and R 2 are the same as defined above; and R 3 represents a hydrogen atom, a (substituted) alkyl group, or a (substituted) aralkyl group) under a hydrogen gas atmosphere in the presence of a metallic catalyst. |