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To a stirred solution of (±)-cis-4-hydroxymethyl-3-methoxymethoxy-piperidine-1-carboxylic acid tert-butyl ester (4.64 mmol, 1.28 g) in DMF (5 mL) at room temperature was added sodium hydride (60% dispersion in mineral oil) (13.9 mmol, 0.56 g) and continued stirring for 15 min. The reaction mixture was cooled to 0° C. using an ice bath. To this was added a solution of 3-butyl-6-chloro-4-(4-cyclohexyloxy-phenyl)-pyridazine (Example 14, 2.32 mmol, 0.80 g) in DMF (5 mL). After completion of addition, the reaction mixture was warmed to 50° C. for 2 hours. After cooling to room temperature, the reaction was poured into a mixture of water (100 mL) and ethyl acetate (100 mL). The mixture was shaken and separated. The ethyl acetate layer was washed with brine, dried (Na2SO4), filtered and concentrated under reduced pressure. The residue was purified on a 40 g SiO2 cartridge using a gradient of ethyl acetate/hexanes to provide (±)-cis-4-[6-butyl-5-(4-cyclohexyloxy-phenyl)-pyridazin-3-yloxymethyl]-3-methoxymethoxy-piperidine-1-carboxylic acid tert-butyl ester (0.60 g, 44° A). LCMS: m/z 583.9 [M+1].

1. additionAfter completion of addition
2. temperaturethe reaction mixture was warmed to 50° C. for 2 hours
3. temperatureAfter cooling to room temperature
4. stirringThe mixture was shaken
5. customseparated
6. washThe ethyl acetate layer was washed with brine
7. dry with materialdried (Na2SO4)
8. filtrationfiltered
9. concentrationconcentrated under reduced pressure
10. customThe residue was purified on a 40 g SiO2 cartridge