Phosphorus oxychloride → 3-Butyl-6-chloro-4-(4-cyclohexyloxy-phenyl)-pyridazine

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A suspension of the pyridazin-3-one (58.4 mmol, 19.1 g) in phosphorous oxychloride (292 mmol, 26.7 mL) was heated at 90° C. for 30 min with stirring during which period the starting material was fully consumed as judged by TLC. The reaction mixture was cooled to room temperature and the volatiles were removed in vacuo. The residue was dissolved in ethyl acetate (200 mL), washed with saturated NaHCO3 (3×100 mL), brine (100 mL), dried (Na2SO4) filtered and concentrated under reduced pressure. The residue was purified on a 330 g SiO2 cartridge eluating with 0-10% ethyl acetate in hexanes to afford 3-butyl-6-chloro-4-(4-cyclohexyloxy-phenyl)-pyridazine.

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