Methyl iodide → (7-nitro-1H-indol-3-yl)acetonitrile

Beteiligte Stoffe

Reaktionsschritte

A solution of N,N-dimethyl-1-(7-nitro-1H-indol-3-yl)methanamine from Step A (3.3 g, 18.5 mmol) in DMF (3 mL), H2O (3 mL), THF (150 mL) and iodomethane (2.85 mL, 45.7 mmol) was heated at reflux for 15 min as a white precipitate formed. Potassium cyanide (6.0 g, 92.1 mmol) was added and reflux was continued for 2 h. The cooled solution was filtered and concentrated under reduced pressure and the residue was triturated with MeOH to give (7-nitro-1H-indol-3-yl)acetonitrile as a yellow solid. A suspension of this solid in MeOH (10 mL) was cooled to 0° C. and HCl (g) was bubbled in slowly for 30 min. The reaction mixture was aged for 1 h, then concentrated in vacuo. To the residue was added 6 M aqueous HCl (20 mL) and the mixture was extracted with EtOAc (3×20 mL). The combined organic extracts were washed with saturated aqueous NaHCO3 (50 mL), then brine (20 mL), dried over Na2SO4, filtered, and concentrated to give the title compound. MS: m/z=235 (M+1).

Herkunft & Nachweise