反应详情

To a solution of Step 1 intermediate, 1,3,6-Trimethyl-5-nitrouracil (0.60 g, 3.012 mmol) in dry N,N-dimethylformamide (5.0 mL) was added N,N-dimethylformamide dimethyl acetal (0.53 g, 4.447 mmol) and the reaction mixture was stirred at room temperature for 2 h. After this time, diethyl ether was added to the reaction mixture and the precipitate was collected by filtration and washed with diethyl ether to give 0.45 g of the product as brownish solid; 1H NMR (δ ppm, 300 MHz, DMSO-d6) 2.98 (s, 6H), 3.16 (s, 3H), 3.40 (s, 3H), 4.78 (d, J=12.6 Hz, 1H), 7.05 (d, J=12.6 Hz, 1H); APCI-MS (m/z) 255.11 (M+H)+.

1. filtrationthe precipitate was collected by filtration
2. washwashed with diethyl ether