Piperazine → (3,5-Dibromo-4-hydroxy-phenyl)-(7-trifluoromethyl-2,3-dihydro-pyrido[2,3-b][1,4]oxazin-1-yl)-methanone

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Reaction Steps

In a 5 ml flask, (3,5-dibromo-4-methoxy-phenyl)-(7-trifluoromethyl-2,3-dihydro-pyrido[2,3-b][1,4]oxazin-1-yl)-methanone (30 mg, 0.061 mmol) was dissolved in N,N-dimethyl formamide (0.3 ml), and then lithium bromide (10 mg, 0.12 mmol) and piperazine (7.8 mg, 0.091 mmol) were added thereto. After stirring for 1 hour, the solvent was removed by evaporation under reduced pressure. The residue was neutralized with water and 1N hydrochloric acid. The resulting solid was filtered to obtain the target compound 22-2 as white solid (25 mg, 86%).

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