反应详情

2-Methyl-6-nitro-2-(piperazin-1-ylmethyl)-2,3-dihydroimidazo[2,1-b]oxazole dihydrochloride prepared in Example 322 (196 mg, 0.73 mmol) was suspended in methylene chloride (10 ml), then neutralized with triethylamine (0.27 ml, 1.94 mmol). To the solution, 4-chlorophenyl isothiocyanate (140 mg, 0.83 mmol) was added followed by stirring at room temperature for 1 hour. The reaction mixture was washed with water, a saturated sodium hydrogencarbonate solution and a saturated saline solution in this order, dried over sodium sulfate and then filtered. The filtrate was concentrated under reduced pressure. The residue was purified by silica gel column chromatography (methylene chloride/methanol=30/1) to afford 4-(2-methyl-6-nitro-2,3-dihydroimidazo[2,1-b]oxazol-2-ylmethyl)piperazine-1-carbothioic acid (4-chlorophenyl)amide (128 mg, yield 40%) as a light brown powder.

1. washThe reaction mixture was washed with water
2. dry with materiala saturated sodium hydrogencarbonate solution and a saturated saline solution in this order, dried over sodium sulfate
3. filtrationfiltered
4. concentrationThe filtrate was concentrated under reduced pressure
5. customThe residue was purified by silica gel column chromatography (methylene chloride/methanol=30/1)