Water → 4-[5-(3-Bromo-4-cyclohexyloxy-phenyl)-6-butyl-pyridazin-3-yloxy]-piperidine-1-carboxylic acid tert-butyl ester

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Reaction Steps

To a stirred solution of 4-hydroxy-piperidine-1-carboxylic acid tert-butyl ester (5.33 mmol, 1.07 g) in THF at room temperature, NaH (100 mg, 4.5 mmol) was added and stirring continued for 30 min then 4-(3-Bromo-4-cyclohexyloxy-phenyl)-3-butyl-6-chloro-pyridazine (3.50 mmol, 1.5 g) was added. The resulting mixture was stirred at 50° C. for over night, poured into water and extracted with ethyl acetate. The organic layer was washed with water, brine dried (Na2SO4) filtered and concentrated under reduced pressure. The product was purified by column chromatography using 10-20% ethyl acetate in hexanes to provide 4-[5-(3-bromo-4-cyclohexyloxy-phenyl)-6-butyl-pyridazin-3-yloxy]-piperidine-1-carboxylic acid tert-butyl ester (1.6 g).

Provenance & Evidence