5Itoyasuo, Katahideo. 1-Ethyl-6,8-difluoro-1,4-dihydro-4oxo 7-piperazlny -quino-line-3-carboxylic derivative and its preparation: JP, 61065882[P]. 1986-04-04.
6Okuno T, Kondo H. Novel quinolinecarboxylic acid compounds, processes for preparing them, pharmaceutical composition and use: EP, 0220523[P]. 1987.
7Hiroshi E. The process of preparation of and relative derivatives[J] . Chem Pharm Bull, 1986,34(10) :4098.
8Cecchetti V. The synthesis of Rufloxacin and derivatives [J]. Syn Commun,1991,21:2301.
9Deanne M, Henry C L. Tetrafluoro-N-phthalimide: US, 5047553[P]. 1991-09-01.
10Liotta C L, Harris H P. Chemistry of naked anions. I .. Reactions of the 18-crown-6 complex of potassium fluoride with organic substrates in aprotic organic solvens[J]. J Am Chem Soe, 1974,96:2250.