Réaction #2383793

Équation de réaction

2,3,4,5-tetrahydro-1,4-benzoxazepin-5-one

potassium nitrate

→

title compound

Rendement 22.2%

7-Nitro-2,3,4,5-tetrahydro-1,4-benzoxazepin-5-one

Rendement 22.2%

Solvants

sulfuric acid

Conditions de réaction

Traitement

1. 1
   workup.WAITfor 4 h at room temperature
2. 2
   Filtrationthe solids were collected by filtration
3. 3
   Températurecooled

Mode opératoire

To 2,3,4,5-tetrahydro-1,4-benzoxazepin-5-one (30.34 g, 190 mmol) in conc. sulfuric acid (600 ml) at 0° C. was added potassium nitrate (20.82 g, 206 mmol) portionwise. The mixture was stirred for 20 minutes at 0° C. and then for 4 h at room temperature. The mixture was poured onto ice (21) and the solids were collected by filtration. The solids were taken up in hot ethyl acetate and then cooled to yield the title compound (8.79 g, 22%), MS m/z 209 [M+H]+.

Source