5-Fluoro-3-methyl-7-oxo-4-piperazin-1-yl-2,3-dihydro-7H-1-oxa-9a-aza-phenalene-8-carboxylic acid 、
2-(氯甲基)喹啉-8-醇 在
potassium carbonate 、 potassium iodide 作用下,
以
N,N-二甲基甲酰胺 为溶剂,
以63%的产率得到8-fluoro-9-[4-(8-hydroxyquinolin-2-ylmethyl)piperazin-1-yl]-3-methyl-6-oxo-2,3-dihydro-6H-1-oxa-3-azaphenalene-5-carboxylic acid