反应详情

A mixture of 5-{4-[4-({[(2-fluoro-5-methylphenyl)amino]carbonyl}amino)phenoxy]pyridin-2-yl}-1H-pyrrole-3-carboxylic acid (300 mg, 0.67 mmol), HATU (281 mg, 0.74 mmol) and N,N-diisopropylethylamine (258 mg, 2.0 mmol) in anhydrous DMF (10 ml) was stirred at room temperature for 10 minutes, followed by addition of ethyl 5-aminovalerate hydrochloride (145 mg, 0.80 mmol). The mixture was stirred for another 10 minutes and poured into 100 ml of water. 2M HCl was added dropwise until pH=4. The precipitates were filtered, washed with water and dried in vacuo to give the crude, which was purified by silica gel chromatography eluting with 3˜5% of methanol in chloroform to give ethyl 5-{[(5-{4-[4-({[(2-fluoro-5-methylphenyl)amino]carbonyl}amino)phenoxy]pyridin-2-yl}-1H-pyrrol-3-yl)carbonyl]amino}pentanoate as white solid. Yield: 288 mg, 75%.

1. stirringThe mixture was stirred for another 10 minutes
2. filtrationThe precipitates were filtered
3. washwashed with water
4. customdried in vacuo
5. customto give the crude, which
6. customwas purified by silica gel chromatography
7. washeluting with 3˜5% of methanol in chloroform