Hydrazine hydrate (1:1) → Ethyl acetate methanol ammonium hydroxide

2-[4-(Cyanomethyl)phenyl]-3-[4-[2-(1-pyrrolidinyl)ethoxy]benzyl]benzo[b]thiophene (1.39 g) was dissolved in ethanol and warmed to 55° C. before it was treated with Raney nickel (1 mL slurry in water) followed by addition of hydrazine monohydrate (1.5 mL). The resulting mixture was allowed to stir at 55° C. for 30 min or until the evolution of gas had stopped. The cooled reaction mixture was filtered through diatomaceous earth, rinsed with methanol and dichloromethane. The filtrate was diluted with saturated sodium bicarbonate (50 mL) and extracted with dichloromethane (50 mL×3). The combined organic layers were dried with sodium sulfate and concentrated. Chromatography with NH4OH:MeOH:EtOAc (5:10:85) afforded the product (1.30 g).