Sodium Hydroxide → 4-Chloro-6-phenyl-3-[4-(pyrimidin-2-yl)piperazin-1-yl]pyridazine

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Reaction Conditions

Reaction Steps

6-phenyl-3-(4-pyrimidin-2-ylpiperazin-1-yl)pyridazin-4-ol (22.6 g, 66 mmol) was suspended in 75 ml phosphorus oxychloride and heated with stirring at 100° C. for 3 h. After cooling to room temperature the mixture was poured onto crushed ice. The mixture was then neutralized with NaOH solution to give white suspension. The precipitation was filtered off, washed with water, dried over filter funnel to provide white solid (21.3 g, 60.3 mmol, 91.4%). ESI-MS: m/z 353.4 (M+H+). 1H NMR (CDCl3): d 8.377 (d, J=4.5, 2H), 8.036 (d, 2H), 7.833 (s, 1H), 7.508 (m, 3H), 6.564 (t, J=4.5, 1H), 4.073 (t, J=4.0, J=4.5, 4H), 3.672 (t, 4H).

Provenance & Evidence