反应详情

To a stirred solution of ethyl 3-methoxy-4-(2-ethylaminoethoxy)benzoate (290 mg, 1.08 mmol) and pentafluorophenyl ester of 3-methoxy-4-[N-(2-methylphenyl)ureido]phenylacetic acid (502 mg, 1.05 mmol) in DMF (7 mL) was added Et3 N (250 μl, 1.79 mmol), and the resulting mixture was stirred overnight. The mixture was diluted with EtOAc, washed with 0.5 N HCl, brine, and dried over Na2SO4. The solvent was evaporated and the residue was purified by column chromatography on silica-gel with CHCl3-MeOH (40:1, v/v) as an eluent to give 550 mg (93%) ethyl 3-methoxy-4-[2-[3-methoxy-4-[N′-(2-methylphenyl)ureido]phenylacetyl]ethylaminoethoxy]benzoate as an amorphous solid. 1H-NMR (CDCl3) δ 1.11–1.18 (m, 3 H), 1.37–1.41 (m, 3 H), 2.30 (s, 3 H), 3.47–3.53 (m, 2 H), 3.61–3.75 (m, 7 H), 3.84 (s, 3 H), 4.03–4.27 (m, 2 H), 4.33–4.39 (m, 2 H), 6.34–8.07 (series of m, total 12 H).

1. washwashed with 0.5 N HCl, brine
2. dry with materialdried over Na2SO4
3. customThe solvent was evaporated
4. customthe residue was purified by column chromatography on silica-gel with CHCl3-MeOH (40:1