Dichloromethane → 5-(1-(6-(4-(2,2-Dimethyl-1,3-dioxan-5-yl)phenoxy)-5-nitropyrimidin-4-yl)piperidin-4-yl)-3-isopropyl-1,2,4-oxadiazole

To an ice-cold solution of 4-chloro-6-(4-(2,2-dimethyl-1,3-dioxan-5-yl)phenoxy)-5-nitropyrimidine (500 mg, 0.0013 moles) and 3-isopropyl-5-(piperidin-4-yl)-1,2,4-oxadiazole hydrochloride (293 mg, 0.0015 mole) in dichloromethane (10 ml) diisopropyl ethyl amine (0.24 ml, 0.0016 mole) was added and the reaction mixture was stirred for 4 hours at 27° C. The reaction mixture was poured into ice cold water and extracted with dichloromethane. The organic extract was successively washed with water & brine, dried over calcium chloride and evaporated under reduced pressure. The crude product so obtained was purified by column chromatography using 20% ethyl acetate in hexane as eluent to yield 450 mg product as pale yellow solid.