1-Bromo-2-Chloroethane → 1-(1H-Indol-3-yl)cyclopropanecarbonitrile

Beteiligte Stoffe

Reaktionsbedingungen

Reaktionsschritte

1H-indole-3-ylacetonitrile (18.7 g) was dissolved in tetrahydrofuran (240 mL) and, after cooling to −30° C., lithium diisopropylamide (2.0M heptane/tetrahydrofuran/ethylbenzene solution, 240 mL) was added dropwise, followed by stirring at −5° C. for 30 minutes. The reaction mixture was cooled to −30° C. and 1-bromo-2-chloroethane (11.0 mL) was added dropwise, followed by stirring for 2 hours while heating to 0° C. The reaction mixture was poured into ice/hydrochloric acid (2N, 360 mL) and extracted with ethyl acetate. The organic layer was washed in turn with water, an aqueous saturated sodium hydrogen carbonate solution and saturated saline, dried over anhydrous magnesium sulfate and then concentrated. The residue was purified by silica gel column chromatography (hexane:ethyl acetate=3:1) to obtain a compound and the compound was recrystallized from (hexane:ethyl acetate=1:1) to obtain the titled compound having the following physical properties (8.67 g).

Herkunft & Nachweise