Hydrochloric Acid → HCID 20389796, compound

Participants

Reaction Steps

6-Cyanomethyl-5,8-difluoro-1,4-benzodioxane (30.34 g, 0.158 mole) dissolved in 300 ml of dry tetrahydrofuran is treated with 308 ml of 1 M borane in tetrahydrofuran under nitrogen. After 2 hours of reflux 300 ml of methanol is added continuously (hydrogen evolution occurs, vigorously at first), then the mixture is refluxed for 30 minutes. Then 50 ml of 10% hydrochloric acid is added very carefully (hydrogen gas evolution again) and the mixture refluxed another 30 minutes. The reaction mixture is concentrated under vacuum to a small volume, then 300 ml of water is added and the mixture made basic with 40% sodium hydroxide. This is extracted with ether, dried, and concentrated to give 6-(2-aminoethyl)-5,8-difluoro-1,4-benzodioxane.

Provenance & Evidence