Réaction #1951059

Équation de réaction

Divinyl-(4-Fluorophenylmethyl)-phosphine oxide

benzylamine

benzylamine

→

1-benzyl-4-(4-fluorophenylmethyl)-[1,4]azaphosphinane 4-oxide

Rendement 77.5%

Solvants

THF

water

Conditions de réaction

Traitement

1. 1
   Températurethe reaction mixture was heated for an additional six hours at 90° C
2. 2
   ConcentrationThe reaction mixture was concentrated by rotary evaporation
3. 3
   Extractionthe product was extracted into dichloromethane
4. 4
   Lavagewashed with saturated brine
5. 5
   SéchageThe organic phase was dried with sodium sulfate
6. 6
   Filtrationfiltered
7. 7
   Concentrationconcentrated by rotary evaporation
8. 8
   LavageThe product was then eluted from the silica with a solution of 10% methanol in ethyl acetate
9. 9
   AutreThe solvents were removed by rotary evaporation

Mode opératoire

Divinyl-(4-Fluorophenylmethyl)-phosphine oxide (0.719 g, 3.42 mmol) and benzylamine (0.45 mL, 4.11 mmol) were dissolved in a mixture of THF (15 mL) and deionized water (15 mL). The reaction mixture was heated at 82° C. for 22 hours. The reaction was not complete and so an additional 0.04 mL of benzylamine was added and the reaction mixture was heated for an additional six hours at 90° C. The reaction mixture was concentrated by rotary evaporation and the product was extracted into dichloromethane and washed with saturated brine. The organic phase was dried with sodium sulfate, filtered, and concentrated by rotary evaporation. The crude product was taken up in 1:1 ethyl acetate:dichloromethane and passed through a plug of silica. The product was then eluted from the silica with a solution of 10% methanol in ethyl acetate. The solvents were removed by rotary evaporation to yield 0.84 g of 1-benzyl-4-(4-fluorophenylmethyl)-[1,4]azaphosphinane 4-oxide (2.65 mmol, 77%). 1H NMR (400 MHz, CDCl3) δ 7.34-7.25 (m, 5H); 7.25-7.20 (m, 2H); 7.04-6.98. (m, 2H); 3.6 (s, 2H); 3.17-3.12 (d, 2H); 3.00-2.85 (m, 2H); 2.81-2.66 (m, 2H); 1.98-1.75 (m, 4H).

Source