Dimethylformamide → 2-Methyl-6-nitro-2-[4-(4-trifluoromethylbenzoyl)piperidin-1-yl]methyl-2,3-dihydroimidazo[2,1-b]oxazole

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A mixture of 2-chloro-1-(2-methyloxiran-2-ylmethyl)-4-nitroimidazole prepared in Example 6 (80 mg, 0.37 mmol), 4-(4-trifluoromethylbenzoyl)piperidine (95 mg, 0.37 mmol), sodium acetate (150 mg, 1.83 mmol) and DMF (2 ml) was stirred at 80° C. overnight. The reaction mixture was poured into water, and extracted with ethyl acetate twice. The organic phases were combined, washed with water three times, washed with a saturated saline solution, dried over sodium sulfate and then concentrated under reduced pressure. The residue was purified by silica gel column chromatography (ethyl acetate/n-hexane=1/1) to afford 2-methyl-6-nitro-2-[4-(4-trifluoromethylbenzoyl)piperidin-1-yl]methyl-2,3-dihydroimidazo[2,1-b]oxazole (46 mg, yield 29%) as a white powder.

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