反应详情

To a solution of 5-benzoyl-3,4-dihydro-2H-1,4-benzoxazine (5.74 g), pyridine (1.9 g) and methylene chloride (100 ml) was dropwise added a solution of bromoacetyl bromide (5.82 g) in methylene chloride (5 ml) at room temperature. After the mixture was stirred for 1.0 hour at the same temperature, water (100 ml) was added thereto under stirring. The organic layer was separated, washed with water, dried over magnesium sulfate and evaporated. The residue was crystallized with a mixture of diisopropyl ether and ethyl acetate. The crystals were collected by filtration to give 4-bromoacetyl-5-benzoyl-3,4-dihydro-2H-1,4-benzoxazine (6.0 g).

1. additionwas added
2. customThe organic layer was separated
3. washwashed with water
4. dry with materialdried over magnesium sulfate
5. customevaporated
6. customThe residue was crystallized with a mixture of diisopropyl ether and ethyl acetate
7. filtrationThe crystals were collected by filtration