反应详情

温度

80 °C

1.1 g (0.37 mmol) of methyl(S)-3-(4-methoxyphenyl)-2-(4-nitrophenoxycarbonyl-amino)propanoate (cf. preparation 2-2) and 0.7 mL (0.37 mmol) of diisopropyl-ethylamine in 5 mL of dimethylformamide are added at 80° C. to a solution of 500 mg (0.37 mmol) of C-(1H-imidazol-4-yl)methylamine dihydrochloride in 15 mL of dimethylformamide. The reaction mixture is stirred for 2 hours at 80° C. The reaction is stopped by adding 30 mL of water and then extracted with ethyl acetate. The organic phases are combined and dried over sodium sulfate. The solvents are evaporated off and the residue is then chromatographed on silica gel (eluent: 80/20 dichloromethane/methanol). 279 mg of methyl (S)-2-[3-(1H-imidazol-4-yl-methyl)-ureido]-3-(4-methoxyphenyl)propanoate in the form of a yellow oil are obtained in a yield of 63%.

1. extractionextracted with ethyl acetate
2. dry with materialdried over sodium sulfate
3. customThe solvents are evaporated off
4. customthe residue is then chromatographed on silica gel (eluent: 80/20 dichloromethane/methanol)