Water → (+/-)-trans-3-[5-(4-Benzyloxy-phenyl)-6-butyl-pyridazin-3-yloxymethyl]-4-methoxymethyl-pyrrolidine-1-carboxylic acid tert-butyl ester

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Reaction Steps

To a stirred solution of (±)-trans-3-[5-(4-benzyloxy-phenyl)-6-butyl-pyridazin-3-yloxymethyl]-4-hydroxymethyl-pyrrolidine-1-carboxylic acid tert-butyl ester (Example 6, 1.0 mmol, 547 mg) in THF (4.0 mL) at 0° C., NaH (60% dispersion in mineral oil, 1.5 mmol, 60 mg) was added and stirring continued for 10 min at room temperature, then methyl iodide (1.5 mmol, 94 μL) was added. The resulting mixture was stirred at room temperature for 2 hour, poured into water, and extracted with ethyl acetate. The organic layers were combined and concentrated under reduced pressure. The product was purified by column chromatography using 50% ethyl acetate in hexanes to give (±)-trans-3-[5-(4-benzyloxy-phenyl)-6-butyl-pyridazin-3-yloxymethyl]-4-methoxymethyl-pyrrolidine-1-carboxylic acid tert-butyl ester, which was dissolved in dichloromethane (1.0 mL), added 4.0 M HCl in dioxane (1.0 mL) and stirred at room temperature for 1 hour. Solvents were evaporated to give (±)-trans-4-(4-benzyloxy-phenyl)-3-butyl-6-(4-methoxymethyl-pyrrolidin-3-ylmethoxy)-pyridazine dihydrochloride.

Provenance & Evidence