4-chloro-6-fluoro-2-oxo-1,2-dihydro[1,8]naphthyridine-3-carbonitrile 、
1-(2-噻吩基羰基)哌嗪 CF3COOH 以to yield 4.85 g (79%) of 6-fluoro-2-oxo-4-[4-(thiophene-2-carbonyl)-piperazine-1-yl]-1,2-dihydro-[1,8]-naphthyridine-3-carbonitrile (98) as yellow solids的产率得到6-fluoro-2-oxo-4-[4-(thiophene-2-carbonyl)-piperazin-1-yl]-1,2-dihydro[1,8]naphthyridine-3-carbonitrile