Stannous chloride dihydrate → 4-Amino-2-ethoxybenzonitrile

Beteiligte Stoffe

Reaktionsbedingungen

Reaktionsschritte

To a suspension of 2-ethoxy-4-nitro-benzonitrile (0.49 g, 2.54 mmol) in ethanol (50 ml) is added tin (II) chloride dihydrate (2.87 g, 12.7 mmol) and the suspension is stirred at 70° C. for 2 hours and at room temperature overnight. The reaction mixture is poured onto ice-water and the pH of the solution is adjusted to pH 7-8 by addition of sodium hydrogen carbonate solution (5% solution in water). The aqueous emulsion is filtered under vacuum and the product is extracted with ethyl acetate (2×150 ml). The organic portions are combined, washed with brine (100 ml), dried (MgSO4) and concentrated in vacuo to yield the titled product as a pale yellow solid which is used in the next step without further purification.

Herkunft & Nachweise