2-(1,1-difluoro-2-methoxyethyl)-6-fluoro-7-methyl-[1,8]-naphthyridine-3-carboxylic acid 、
双环[3.2.1]辛烷-2,4-二酮 以to give 3-[6-fluoro-2-(2-methoxy-1,1-difluoroethyl)-7-methyl [1,8]-naphthyridine-3-carbonyl]-bicyclo[3.2.1]octane-2,4-dione, yellow solid, Molecular ion的产率得到3-[6-fluoro-2-(2-methoxy-1,1-difluoroethyl)-7-methyl[1,8]-naphthyridine-3-carbonyl]-bicyclo[3.2.1]octane-2,4-dione