To a suspension of 130 mg of methanesulfonic acid 3-[5-[3-methoxy-4-(5-oxo-4,5-dihydro-[1,2,4]oxadiazol-3-yl)-phenoxymethyl]-2-(4-trifluoromethyl-phenyl)-thiazol-4-yl]-propyl ester in 7 mL of acetonitrile was added 25 μL of azetidine and 57 mg of diisopropylethyl amine. The resulting mixture was heated in a sealed tube to 60° C. under microwave irradiation for 30 minutes and then concentrated under reduced pressure. The residue was purified by column chromatography on silica gel (gradient from dichloromethane 100 to dichloromethane 90/methanol 10/water 1/acetic acid 1) followed by a 2 g SCX Waters column with gradient CH2Cl2/MeOH 30/70 to 7N NH3 in MeOH and another column chromatography on silica gel (eluting with dichloromethane 90/methanol 10) to give 3.5 mg of 3-{4-[4-(3-azetidin-1-yl-propyl)-2-(4-trifluoromethyl-phenyl)-thiazol-5-ylmethoxy]-2-methoxy-phenyl}-4H-[1,2,4]oxadiazol-5-one.
