Water → (3,5-Dibromo-4-methoxy-phenyl)-(7-pyridin-3-yl-2,3-dihydro-pyrido[2,3-b][1,4]oxazin-1-yl)-methanone

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Reaction Steps

In a 10 ml flask, 7-pyridin-3-yl-2,3-dihydro-1H-pyrido[2,3-b][1,4]oxazine (30 mg, 0.140 mmol) and 3,5-dibromo-4-methoxy-benzoyl chloride (50.5 mg, 0.154 mmol) were dissolved in dichloromethane (2 ml). Triethylamine (0.058 ml, 0.42 mmol) was added thereto and then stirred at room temperature for 1 hour. After completion of the reaction by adding water dropwise, the mixture was extracted with dichloromethane, and the combined organic layer was dried over anhydrous sodium sulfate (Na2SO4), filtered and evaporated under reduced pressure. The residue was purified by preparative TLC eluting a solvent of ethyl acetate:methanol=20:1. Silica gels containing the product were eluted with dichloromethane and the solvent was evaporated to obtain (3,5-dibromo-4-methoxy-phenyl)-(7-pyridin-3-yl-2,3-dihydro-pyrido[2,3-b][1,4]oxazin-1-yl)-methanone as white solid (35 mg, 49%).

Provenance & Evidence