反应详情

温度

90 °C

37.5 g (0.3 mol) 6-methylisocytosine, 55.8 g (0.36 mol) 2-isocyanatoethyl methacrylate and 3.7 g (0.015 mmol) dibutyltin oxide were added to 400 ml dimethylacetamide. 100 mg BHT was added and the mixture was heated to 90° C. for one hour. The mixture was filtered at 90° C. Upon cooling down to room temperature 2-methyl-2-propenoic acid-2-[[[(1,4-dihydro-6-methyl-4-oxo-2-pyrimidinyl)amino]carbonyl]amino]ethyl ester started to crystallize. The mixture was stirred for two and a half hour. 500 ml acetone was added and 3-methyl-2-propenoic acid-2-[[[(1,4-dihydro-6-methyl-4-oxo-2-pyrimidinyl)amino]carbonyl]amino]ethyl ester was isolated by filtration. 2-methyl-2-propenoic acid-2-[[[(1,4-dihydro-6-methyl-4-oxo-2-pyrimidinyl)amino]carbonyl]amino]ethyl ester was treated with 500 ml acetone, again isolated by filtration and dried. 68.6 g (82%) of 2-methyl-2-propenoic acid-2-[[[(1,4-dihydro-6-methyl-4-oxo-2-pyrimidinyl)amino]carbonyl]amino]ethyl ester was isolated (m.p.:208° C.).

1. addition100 mg BHT was added
2. filtrationThe mixture was filtered at 90° C
3. temperatureUpon cooling down to room temperature 2-methyl-2-propenoic acid-2-[[[(1,4-dihydro-6-methyl-4-oxo-2-pyrimidinyl)amino]carbonyl]amino]ethyl ester
4. customto crystallize
5. addition500 ml acetone was added