Methyl iodide → 5-(2-Amino-pyrimidin-4-yl)-1-methyl-1H-pyrrole-3-carboxylic acid ethyl ester

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Reaction Steps

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.

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