As shown in the Scheme above, 1-(4-(4-aminothieno[3,2-c]pyridin-3-yl)phenyl)-3-(3-fluorophenyl)urea ((1), prepared as described in WO2005/10009), in a mixture of pyridine and tetrahydrofuran can be treated with iodine at room temperature, followed by treatment with potassium hydroxide at elevated temperature to provide 1-(4-(4-amino-7-iodothieno[3,2-c]pyridin-3-yl)phenyl)-3-(3-fluorophenyl)urea (2). Methyl 4-amino-3-(4-(3-(3-fluorophenyl)ureido)phenyl)thieno[3,2-c]pyridine-7-carboxylate (3) can be prepared by reacting 1-(4-(4-amino-7-iodothieno[3,2-c]pyridin-3-yl)phenyl)-3-(3-fluorophenyl)urea (2) with carbon monoxide gas in the presence of a catalyst such as but not limited to [1,1′-bis(diphenylphosphino)ferrocene]dichloropalladium(II) dichloromethane, and a base such as but not limited to triethylamine. The reaction is typically performed under pressure and at an elevated temperature. Methyl 4-amino-3-(4-(3-(3-fluorophenyl)ureido)phenyl)thieno[3,2-c]pyridine-7-carboxylate (3) can be reacted with aqueous lithium hydroxide to provide 4-amino-3-(4-(3-(3-fluorophenyl)ureido)phenyl)thieno[3,2-c]pyridine-7-carboxylic acid (4). The reaction is typically performed at elevated temperature in a solvent such as but not limited to tetrahydrofuran and methanol. 4-Amino-3-(4-(3-(3-fluorophenyl)ureido)phenyl)thieno[3,2-c]pyridine-7-carboxylic acid (4) can be reacted with N,N-diethyl-1,3-propanediamine in the presence of a coupling agent such as but not limited to 1-ethyl-3-[3-(dimethylamino)propyl]-carbodiimide hydrochloride, an auxiliary coupling reagent such as but not limited to 1-hydroxybenzotriazole hydrate, and a base such as but not limited to N-methylmorpholine to provide 4-amino-N-[3-(diethylamino)propyl]-3-(4-{[(3-fluorophenyl)carbamoyl]amino}phenyl)thieno[3,2-c]pyridine-7-carboxamide (5). The reaction is typically performed in a solvent such as but limited to N,N-dimethylformamide.
