A mixture of 130 mg (0.23 mmol) of 6-amino-4-[3-chloro-4-(1-methyl-1H-imidazole-2-ylsulfanyl)phenylamino]-7-(4-pyrrolidin-1-yl-piperidin-1-yl)quinoline-3-carbonitrile, 12.0 mg (0.4 mmol) of paraformaldehyde, 25.0 mg (0.39 mmol) of sodium cyanoborohydride and 2 drops of acetic acid in 15 mL of ethanol is heated under reflux for 8 hours. The mixture is cooled to room temperature and solvent removed in vacuo. A 12 mL solution of 1N sodium hydroxide is added to the residue, and the mixture is stirred. A crude solid is collected by filtration, washed with water and dried. Purification by silica gel chromatography (gradient 95:5 methylene chloride/methanol to 4:1 methylene chloride/methanol) gives 66.0 mg of the 4-({3-Chloro-4-[(1-methyl-1H-imidazole-2-yl)thio]phenyl}amino)-6-(methylamino)-7-(4-pyrrolidin-1-ylpiperidin-1-yl)quinoline-3-carbonitrile as an yellow solid, mp 242-250° C.
