Ethanol → 6-(3-Chlorobenzyl)-1-cyclopentyl-1,5-dihydro-4H-pyrazolo[3,4-d]pyrimidin-4-one

참여 물질

반응 단계

Under argon, 180 mg (0.91 mmol) of 5-amino-1-cyclopentyl-1H-pyrazole-4-carboxamide and 575 mg (2.72 mmol; 3 equiv.) of ethyl (3-chlorophenyl)acetate are introduced into 3.5 ml of absolute ethanol. At 0° C., 127 mg of sodium hydride (60% dispersion in mineral oil; 3.18 mmol; 3.5 equiv.) are slowly added in a countercurrent of argon. The resulting mixture is slowly warmed and stirred under reflux for 18 h. The mixture is worked up by adding 50 ml of water and extracted several times with ethyl acetate. The combined organic phases are dried over sodium sulfate and concentrated in vacuo. The crude product is purified by preparative HPLC.

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