Methods:3-decarboxylic quinolones were obtained via condensation of compound 5 with o-phenylenediamine.PPA was used as a dehydration agent.

• 方法:在喹诺酮类化合物5与邻苯二胺缩合中,以多聚磷酸(PPA)为脱水剂,可以得到3-脱羧产物。