6-Fluoro-9-hydroxybenzo[g]isoquinoline-5,10-dione 、
6-chloro-9-hydroxybenzo [g]isoquinoline-5,10-dione 、
6-fluoro-9-(p-toluenesulfonyloxy)benzo[g]isoquinoline-5,10-dione 以
二氯甲烷 为溶剂,
以obtained in Preparative Example 16的产率得到6-chloro-9-(p-toluenesulfonyloxy)benzo[g]isoquinoline-5,10-dione