Sulfuric Acid → 2-[(4-(2-Methyl-4-(pyridin-4-yl)-2H-pyrazol-3-yl)phenoxy)methyl]quinoline

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Reaction Steps

To a solution of 2-[4-(4-Pyridin-4-yl-2H-pyrazol-3-yl)-phenoxymethyl}-quinoline (1.72 g) in ethanol (20 ml) was added methyl hydrazine (3.5 ml, 1.5 eq.) and concentrated sulfuric acid (0.1 ml). The reaction mixture was stirred 1 h at ambient temperature and solvent evaporated. The reaction mixture was partitioned between methylene chloride and saturated sodium bicarbonate. The layers were separated and the organic layer dried magnesium sulfate, filtered and concentrated. Preparative HPLC chromatography provided the title compound (minor isomer) as a white solid (0.30 g, 17%). 1H NMR (400 MHz, CDCl3) δ 8.31 (d, J=5.4 Hz, 2 H), 8.21 (d, J=8.7 Hz, 1 H), 7.80 (d, J=8.3 Hz, 1H), 7.77 (s, 1 H), 7.66 (m, 3 H), 7.53 (m, 1H), 7.19 (d, J=8.7 Hz, 2 H), 7.11 (d, J=8.7 Hz, 2H), 7.01 (d, J=6.2 Hz, 2H) 5.40 (s, 2H), 3.69 (s, 3H); MS: (M+H m/z=393.3).

Provenance & Evidence