反应详情

In the same manner as in Example 1, 2-(2,6-dichlorobenzamido)pent-4-enoic acid methyl ester (45.6 mg) was reacted with (4-iodophenyl)-(4-acetoxybenzyl)pyrimidin-2-ylamine (67.4 mg) to obtain (E)-2-(2,6-dichlorobenzamido)-5-[4-((4-acetoxy-benzyl)-pyrimidin-2-ylamino)phenyl]pent-4-enoic acid methyl ester (61.7 mg). Column chromatography (silica gel, eluent: ethyl acetate/hexane=1/3→3/1) and thin layer chromatography (silica gel, developing solvent: cyclohexane/ethyl acetate=1/5) were used for purification. (2) To a solution of (E)-2-(2,6-dichlorobenzamido)-5-[4-((4-acetoxy-benzyl)-pyrimidin-2-ylamino)phenyl]pent-4-enoic acid methyl ester (61.7 mg) in THF (3.0 ml), 0.1N aqueous sodium hydroxide solution (3.0 ml) was added, and the resulting mixture was stirred at room temperature for 2 hours. Water (50 ml) was added to the reaction solution and the resulting mixture was washed with ether. Aqueous layer was acidified by adding 1N hydrochloric acid thereto and extracted twice with ethyl acetate. Organic layers were washed with saturated brine and dried over anhydrous sodium sulfate. After removing anhydrous sodium sulfate by filtration, the filtrate was concentrated to dryness to obtain (E)-2-(2,6-dichlorobenzamido)-5-[4-((4-hydroxy-benzyl)-pyrimidin-2-ylamino)phenyl]pent-4-enoic acid (43 mg).