Reaktion #644364

Reaktionsgleichung

2-methyl-2-propanol

samarium(II) iodide

Benzo[b]thiophene-7-carboxaldehyde

lithium cyanide tetrahydrofuran

samarium(II) iodide

diethyl cyanophosphonate

→

title compound

Benzo[b]thiophene-7-acetonitrile

Lösungsmittel

tetrahydrofuran

tetrahydrofuran

Reaktionsbedingungen

Aufarbeitung

1. 1
   Sonstigeto the stirring reaction mixture
2. 2
   SonstigeIf the resulting reaction mixture
3. 3
   workup.STIRRINGStir
4. 4
   Sonstigethe reaction at 25° C. for 1 hour
5. 5
   EinengenConcentrate under reduced pressure
6. 6
   workup.ADDITIONdilute with ethyl acetate, diethyl ether (1:1)
7. 7
   Waschenwash with aqueous 0.1 M hydrochloric acid, and aqueous saturated sodium chloride
8. 8
   TrocknenDry the organic phase over anhydrous magnesium sulfate
9. 9
   Filtrationfilter
10. 10
    Einengenconcentrate under reduced pressure

Vorschrift

Add Benzo[b]thiophene-7-carboxaldehyde (2.34 g, 14.4 mmol) and lithium cyanide tetrahydrofuran complex (LiCN*1.5 Tetrahydrofuran, 204 mg, 1.44 mmol) to tetrahydrofuran (40 mL) under nitrogen. Add dropwise neat diethyl cyanophosphonate (2.8 mL, 18.4 mmol) to the stirring reaction mixture. Stir at room temp under nitrogen for 60 hours. Add 2-methyl-2-propanol (1.4 mL, 14.6 mmol). Add the reaction mixture via cannula to a stirred 0.1 molar solution of samarium(II) iodide in tetrahydrofuran (360 mL, 36.0 mmol) at 25° C. under nitrogen. If the resulting reaction mixture is not deep blue add additional samarium(II) iodide solution until deep blue color persists. Stir the reaction at 25° C. for 1 hour. Concentrate under reduced pressure, dilute with ethyl acetate, diethyl ether (1:1), wash with aqueous 0.1 M hydrochloric acid, and aqueous saturated sodium chloride. Dry the organic phase over anhydrous magnesium sulfate, filter, and concentrate under reduced pressure. Chromatograph on flash silica using a gradient from neat hexane to 25% ethyl acetate in hexane to obtain the title compound as an off-white solid.

Quelle