Reaktion #83190

Reaktionsgleichung

water

sodium hydride

tetraisopropyl methylenebisphosphonate

(E,E)-farnesyl bromide

→

Tetraisopropyl (E,E)-farnesylmethylenebisphosphonate

Ausbeute 60.9%

Lösungsmittel

dimethoxyethane

dimethoxyethane

Reaktionsbedingungen

Aufarbeitung

1. 1
   workup.STIRRINGThe reaction mixture was stirred at room temperature for 1 hour
2. 2
   Extraktionextracted with ethyl acetate
3. 3
   WaschenThe organic layer was washed with water
4. 4
   Trocknendried (MgSO4)
5. 5
   workup.DISTILLATIONthe solvent was distilled off under reduced pressure

Vorschrift

Oily sodium hydride (60%, 0.24 g) was added to a solution of tetraisopropyl methylenebisphosphonate (3.44 g) in dimethoxyethane (25 ml). The mixture was stirred at room temperature for 1 hour. Then, a solution of (E,E)-farnesyl bromide (1.43 g) in dimethoxyethane (5 ml) was added dropwise at 0° C. The reaction mixture was stirred at room temperature for 1 hour, then poured into water and extracted with ethyl acetate. The organic layer was washed with water and dried (MgSO4), and then the solvent was distilled off under reduced pressure. The oily residue was subjected to column chromatography on silica gel. Tetraisopropyl (E,E)-farnesylmethylenebisphosphonate (1.67 g, 60.9%) was obtained as an oil from the fractions obtained by elution with ethyl acetate-chloroform (1:1, v/v).

Quelle