反应详情

To a solution of 5-(2-amino-pyrimidin-4-yl)-1H-pyrrole-3-carboxylic acid ethyl ester (5.1 g, 21.96 mmol) in tetrahydrofuran (70 mL) and dimethylsulfoxide (15 mL) cooled in a ice-water bath, NaH (0.96 g, 24.15 mmol) and methyl iodide (1.5 mL, 24.15 mmol) were added. The reaction was continued at room temperature for 12 h, the tetrahydrofuran was removed under vacuo, then dichloromethane (200 mL) were added and the organic phase washed with water (100 mL). The acqueous fraction was extracted with dichloromethane (1×100 mL). The organic fractions were combined, dried over sodium sulfate, filtered, and concentered in vacuo. Purification by flash chromatography on silica gel (eluant: dichloromethane/ethanol 95/5) provided 4.45 g (82%) of the title compound as a pale yellow solid.

1. customthe tetrahydrofuran was removed under vacuo
2. additiondichloromethane (200 mL) were added
3. washthe organic phase washed with water (100 mL)
4. extractionThe acqueous fraction was extracted with dichloromethane (1×100 mL)
5. dry with materialdried over sodium sulfate
6. filtrationfiltered
7. customPurification by flash chromatography on silica gel (eluant: dichloromethane/ethanol 95/5)