反应详情

温度

115 °C

1,3-Dimethyl-2-oxo-2,3-dihydro-1H-benzoimidazole-5-carbaldehyde (2.48 g, 13.1 mmol, obtained using the same procedure used for 1,3-Diethyl-2-oxo-2,3-dihydro-1H-benzoimidazole-5-carbaldehyde) in n-butanol (25 mL) was treated with □-alanine (298.0 mg) and nitroethane (1.85 mL). The mixture was heated to 115° C. for 4 hours, more nitroethane (0.5 mL) was added and the heating was continued for 2 hours. The reaction was allowed to cool, was filtered and washed with ether then dried to give 1,3-Dimethyl-5-(2-nitro-propenyl)-1,3-dihydro-benzoimidazol-2-one (2.229 g).

1. temperatureto cool
2. filtrationwas filtered
3. washwashed with ether
4. customthen dried