2-(三氟甲基)-1,8-萘啶-3-羧酸 、
1-甲基-1H-吡唑-5(4h)-酮 以to give 2-methyl-4-(2-trifluoromethyl-[1,8]-naphthyridine-3-carbony)-2,4-dihydropyrazol-3-one as a solid, 1H NMR (D2O) δ: 9.18 (1H, d), 8.59 (1H, s), 8.55 (1H, dd), 7.80 (1H, dd), 4.76 (1H, s), 3.29 (3H, s), Molecular ion的产率得到2-methyl-4-(2-trifluoromethyl-[1,8]-naphthyridine-3-carbonyl)-2,4-dihydropyrazol-3-one