A mixture of methanesulfonic acid [(2R,3R,4R)-2-[(1R)-1-(3,5-bis(trifluoromethyl)-phenyl)ethoxy]-3-(3,4-difluorophenyl)-tetrahydropyran-4-yl]methyl ester (Description 16; 0.275 g, 0.49 mmol), 2-oxa-8-aza-spiro[4.5]decan-4-ol hydrochloride (Description 8; 0.1 g, 0.37 mmol), potassium carbonate (237 g, 1.7 mmol) and acetonitrile (3 ml) was stirred at 55° C. overnight and then at 65° C. for 18 hours. The mixture was treated with water and extracted into dichloromethane. The combined organic extracts were dried (Na2SO4) and concentrated. The residue was purified by preparative TLC (dichloromethane:methanol) to give the title compound.
