Reaktion #3997

Reaktionsgleichung

THF

hypophosphorous acid

phenyl-2-aminoethyl selenide

Diphenyl diselenide

tetrahydrofuran

→

Phenyl-2-aminoethyl selenide

diselenide

Lösungsmittel

Et2O

Reaktionsbedingungen

Aufarbeitung

1. 1
   Temperaturheating
2. 2
   Temperaturthe reaction was refluxed under argon for 6 hours
3. 3
   Temperaturcooled
4. 4
   Waschenwashed with 200 ml of 0.127M NaOAc buffer pH 5.0
5. 5
   Sonstigeto remove the phosphoric acid by-product
6. 6
   SonstigeBoth the Et2O and the buffer were deoxygenated
7. 7
   Sonstigeby bubbling argon through fritted glass for over 1 hour in order
8. 8
   EinengenThe washed organic phase was then concentrated

Vorschrift

A preferred compound is phenyl-2-aminoethyl selenide and salts thereof. Phenyl-2-aminoethyl selenide (PAESe) was synthesized by employing the following procedure. Diphenyl diselenide, 24.707 g (79.16 mmol) was dissolved into 100 ml of tetrahydrofuran (THF) with steam heating. To the intensely dark red THF solution was added 9.84 ml (95 mmol, 1.2 eq.) of 50% hypophosphorous acid and the reaction was refluxed under argon for 6 hours, cooled, and diluted with 200 ml of Et2O and washed with 200 ml of 0.127M NaOAc buffer pH 5.0 to remove the phosphoric acid by-product. Both the Et2O and the buffer were deoxygenated by bubbling argon through fritted glass for over 1 hour in order to prevent reoxidation of phenylselenol to diphenyl diselenide. The washed organic phase was then concentrated to yield a yellow oil (diselenide contaminant) with residual salt-containing water pockets. The crude product was pumped down to remove residual solvent prior to distillation, which yielded the desired phenylselenol (12.6 g, 51% yield). pNMR (CDCl3) (s, 1H) 1.54 d (m, 5H) 7.35 d. Yields as high as 70% have been obtained for this reaction.

Quelle