ethyl 7-chloro-6-fluoro-5-methyl-2-trifluoromethyl-[1,8]-naphthyridine-3-carboxylate 、
甲基硼酸 以to give ethyl 5,7-dimethyl-6-fluoro-2-trifluoromethyl-[1,8]-naphthyridine-3-carboxylate, 1H NMR (CDCl3) δ: 8.78 (1H, s), 4.50 (2H, q), 2.84 (3H, d), 2.68 (3H, d), 1.46 (3H, t)的产率得到ethyl 5,7-dimethyl-6-fluoro-2-trifluoromethyl-[1,8]-naphthyridine-3-carboxylate