Hydrochloric Acid → (2,3-Dihydro-pyrido[4,3-b][1,4]oxazin-4-yl)-methanone

Participants

Reaction Steps

In a 10 ml flask, (3,5-difluoro-4-methoxy-phenyl)-(2,3-dihydro -pyrido[4,3-b][1,4]oxazin-4-yl)-methanone (50 g, 0.163 mmol), lithium bromide (57 mg, 0.65 mmol) and piperazine (21 mg, 0.24 mmol) were dissolved with N,N-dimethyl formamide, and stirred at 1000 for 3 hours. After completion of the reaction by adding water dropwise, the mixture was adjusted to weak acidic condition (pH=6) by using 1N hydrochloric acid, and the formed solid was filtered and washed with distilled water and ethyl acetate. The resulting solid was recrystallized from methanol to obtain the target compound 29, i.e., 3,5-difluoro-4-hydroxy -phenyl)-(2,3-dihydro-pyrido[4,3-b][1,4]oxazin-4-yl)-methanone (31 mg, 65%).

Provenance & Evidence