Potassium Hydroxide → 2,3,4,5-Tetrahydro-1,4-benzoxazepin-5-one

Participants

Reaction Steps

The chroman-4-one (5.0 g, 33.8 mmol) was dissolved in sulfuric acid (10 mL) and the mixture was cooled at 0 oC. Sodium azide (2.88 g, 44.3 mmol) was added portionwise followed by some sulfuric acid (5 mL). The reaction mixture was stirred at room temperature over night. The mixture was then pour into ice-water and basified to pH=7 with potassium hydroxide pellets. This aqueous layer was extracted with ether (twice).

Provenance & Evidence